[PATCH v13 01/24] selftests/x86: Move protecton key selftest to arch neutral directory

[Ram Pai <linuxram@xxxxxxxxxx>]

cc: Dave Hansen <dave.hansen@xxxxxxxxx>
cc: Florian Weimer <fweimer@xxxxxxxxxx>
Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
Signed-off-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 tools/testing/selftests/vm/.gitignore         |    1 +
 tools/testing/selftests/vm/Makefile           |    1 +
 tools/testing/selftests/vm/pkey-helpers.h     |  219 ++++
 tools/testing/selftests/vm/protection_keys.c  | 1485 +++++++++++++++++++++++++
 tools/testing/selftests/x86/.gitignore        |    1 -
 tools/testing/selftests/x86/pkey-helpers.h    |  219 ----
 tools/testing/selftests/x86/protection_keys.c | 1485 -------------------------
 7 files changed, 1706 insertions(+), 1705 deletions(-)
 create mode 100644 tools/testing/selftests/vm/pkey-helpers.h
 create mode 100644 tools/testing/selftests/vm/protection_keys.c
 delete mode 100644 tools/testing/selftests/x86/pkey-helpers.h
 delete mode 100644 tools/testing/selftests/x86/protection_keys.c

diff --git a/tools/testing/selftests/vm/.gitignore b/tools/testing/selftests/vm/.gitignore
index 342c7bc..0214fbf 100644
--- a/tools/testing/selftests/vm/.gitignore
+++ b/tools/testing/selftests/vm/.gitignore
@@ -12,3 +12,4 @@ mlock-random-test
 virtual_address_range
 gup_benchmark
 va_128TBswitch
+protection_keys
diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
index fdefa22..9788a58 100644
--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -20,6 +20,7 @@ TEST_GEN_FILES += transhuge-stress
 TEST_GEN_FILES += userfaultfd
 TEST_GEN_FILES += va_128TBswitch
 TEST_GEN_FILES += virtual_address_range
+TEST_GEN_FILES += protection_keys
 
 TEST_PROGS := run_vmtests
 
diff --git a/tools/testing/selftests/vm/pkey-helpers.h b/tools/testing/selftests/vm/pkey-helpers.h
new file mode 100644
index 0000000..254e543
--- /dev/null
+++ b/tools/testing/selftests/vm/pkey-helpers.h
@@ -0,0 +1,219 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _PKEYS_HELPER_H
+#define _PKEYS_HELPER_H
+#define _GNU_SOURCE
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <signal.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <ucontext.h>
+#include <sys/mman.h>
+
+#define NR_PKEYS 16
+#define PKRU_BITS_PER_PKEY 2
+
+#ifndef DEBUG_LEVEL
+#define DEBUG_LEVEL 0
+#endif
+#define DPRINT_IN_SIGNAL_BUF_SIZE 4096
+extern int dprint_in_signal;
+extern char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
+static inline void sigsafe_printf(const char *format, ...)
+{
+	va_list ap;
+
+	if (!dprint_in_signal) {
+		va_start(ap, format);
+		vprintf(format, ap);
+		va_end(ap);
+	} else {
+		int ret;
+		/*
+		 * No printf() functions are signal-safe.
+		 * They deadlock easily. Write the format
+		 * string to get some output, even if
+		 * incomplete.
+		 */
+		ret = write(1, format, strlen(format));
+		if (ret < 0)
+			exit(1);
+	}
+}
+#define dprintf_level(level, args...) do {	\
+	if (level <= DEBUG_LEVEL)		\
+		sigsafe_printf(args);		\
+} while (0)
+#define dprintf0(args...) dprintf_level(0, args)
+#define dprintf1(args...) dprintf_level(1, args)
+#define dprintf2(args...) dprintf_level(2, args)
+#define dprintf3(args...) dprintf_level(3, args)
+#define dprintf4(args...) dprintf_level(4, args)
+
+extern unsigned int shadow_pkru;
+static inline unsigned int __rdpkru(void)
+{
+	unsigned int eax, edx;
+	unsigned int ecx = 0;
+	unsigned int pkru;
+
+	asm volatile(".byte 0x0f,0x01,0xee\n\t"
+		     : "=a" (eax), "=d" (edx)
+		     : "c" (ecx));
+	pkru = eax;
+	return pkru;
+}
+
+static inline unsigned int _rdpkru(int line)
+{
+	unsigned int pkru = __rdpkru();
+
+	dprintf4("rdpkru(line=%d) pkru: %x shadow: %x\n",
+			line, pkru, shadow_pkru);
+	assert(pkru == shadow_pkru);
+
+	return pkru;
+}
+
+#define rdpkru() _rdpkru(__LINE__)
+
+static inline void __wrpkru(unsigned int pkru)
+{
+	unsigned int eax = pkru;
+	unsigned int ecx = 0;
+	unsigned int edx = 0;
+
+	dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
+	asm volatile(".byte 0x0f,0x01,0xef\n\t"
+		     : : "a" (eax), "c" (ecx), "d" (edx));
+	assert(pkru == __rdpkru());
+}
+
+static inline void wrpkru(unsigned int pkru)
+{
+	dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
+	/* will do the shadow check for us: */
+	rdpkru();
+	__wrpkru(pkru);
+	shadow_pkru = pkru;
+	dprintf4("%s(%08x) pkru: %08x\n", __func__, pkru, __rdpkru());
+}
+
+/*
+ * These are technically racy. since something could
+ * change PKRU between the read and the write.
+ */
+static inline void __pkey_access_allow(int pkey, int do_allow)
+{
+	unsigned int pkru = rdpkru();
+	int bit = pkey * 2;
+
+	if (do_allow)
+		pkru &= (1<<bit);
+	else
+		pkru |= (1<<bit);
+
+	dprintf4("pkru now: %08x\n", rdpkru());
+	wrpkru(pkru);
+}
+
+static inline void __pkey_write_allow(int pkey, int do_allow_write)
+{
+	long pkru = rdpkru();
+	int bit = pkey * 2 + 1;
+
+	if (do_allow_write)
+		pkru &= (1<<bit);
+	else
+		pkru |= (1<<bit);
+
+	wrpkru(pkru);
+	dprintf4("pkru now: %08x\n", rdpkru());
+}
+
+#define PROT_PKEY0     0x10            /* protection key value (bit 0) */
+#define PROT_PKEY1     0x20            /* protection key value (bit 1) */
+#define PROT_PKEY2     0x40            /* protection key value (bit 2) */
+#define PROT_PKEY3     0x80            /* protection key value (bit 3) */
+
+#define PAGE_SIZE 4096
+#define MB	(1<<20)
+
+static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
+		unsigned int *ecx, unsigned int *edx)
+{
+	/* ecx is often an input as well as an output. */
+	asm volatile(
+		"cpuid;"
+		: "=a" (*eax),
+		  "=b" (*ebx),
+		  "=c" (*ecx),
+		  "=d" (*edx)
+		: "0" (*eax), "2" (*ecx));
+}
+
+/* Intel-defined CPU features, CPUID level 0x00000007:0 (ecx) */
+#define X86_FEATURE_PKU        (1<<3) /* Protection Keys for Userspace */
+#define X86_FEATURE_OSPKE      (1<<4) /* OS Protection Keys Enable */
+
+static inline int cpu_has_pku(void)
+{
+	unsigned int eax;
+	unsigned int ebx;
+	unsigned int ecx;
+	unsigned int edx;
+
+	eax = 0x7;
+	ecx = 0x0;
+	__cpuid(&eax, &ebx, &ecx, &edx);
+
+	if (!(ecx & X86_FEATURE_PKU)) {
+		dprintf2("cpu does not have PKU\n");
+		return 0;
+	}
+	if (!(ecx & X86_FEATURE_OSPKE)) {
+		dprintf2("cpu does not have OSPKE\n");
+		return 0;
+	}
+	return 1;
+}
+
+#define XSTATE_PKRU_BIT	(9)
+#define XSTATE_PKRU	0x200
+
+int pkru_xstate_offset(void)
+{
+	unsigned int eax;
+	unsigned int ebx;
+	unsigned int ecx;
+	unsigned int edx;
+	int xstate_offset;
+	int xstate_size;
+	unsigned long XSTATE_CPUID = 0xd;
+	int leaf;
+
+	/* assume that XSTATE_PKRU is set in XCR0 */
+	leaf = XSTATE_PKRU_BIT;
+	{
+		eax = XSTATE_CPUID;
+		ecx = leaf;
+		__cpuid(&eax, &ebx, &ecx, &edx);
+
+		if (leaf == XSTATE_PKRU_BIT) {
+			xstate_offset = ebx;
+			xstate_size = eax;
+		}
+	}
+
+	if (xstate_size == 0) {
+		printf("could not find size/offset of PKRU in xsave state\n");
+		return 0;
+	}
+
+	return xstate_offset;
+}
+
+#endif /* _PKEYS_HELPER_H */
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
new file mode 100644
index 0000000..460b4bd
--- /dev/null
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -0,0 +1,1485 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Tests x86 Memory Protection Keys (see Documentation/x86/protection-keys.txt)
+ *
+ * There are examples in here of:
+ *  * how to set protection keys on memory
+ *  * how to set/clear bits in PKRU (the rights register)
+ *  * how to handle SEGV_PKRU signals and extract pkey-relevant
+ *    information from the siginfo
+ *
+ * Things to add:
+ *	make sure KSM and KSM COW breaking works
+ *	prefault pages in at malloc, or not
+ *	protect MPX bounds tables with protection keys?
+ *	make sure VMA splitting/merging is working correctly
+ *	OOMs can destroy mm->mmap (see exit_mmap()), so make sure it is immune to pkeys
+ *	look for pkey "leaks" where it is still set on a VMA but "freed" back to the kernel
+ *	do a plain mprotect() to a mprotect_pkey() area and make sure the pkey sticks
+ *
+ * Compile like this:
+ *	gcc      -o protection_keys    -O2 -g -std=gnu99 -pthread -Wall protection_keys.c -lrt -ldl -lm
+ *	gcc -m32 -o protection_keys_32 -O2 -g -std=gnu99 -pthread -Wall protection_keys.c -lrt -ldl -lm
+ */
+#define _GNU_SOURCE
+#include <errno.h>
+#include <linux/futex.h>
+#include <sys/time.h>
+#include <sys/syscall.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <signal.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <ucontext.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ptrace.h>
+#include <setjmp.h>
+
+#include "pkey-helpers.h"
+
+int iteration_nr = 1;
+int test_nr;
+
+unsigned int shadow_pkru;
+
+#define HPAGE_SIZE	(1UL<<21)
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
+#define ALIGN_UP(x, align_to)	(((x) + ((align_to)-1)) & ~((align_to)-1))
+#define ALIGN_DOWN(x, align_to) ((x) & ~((align_to)-1))
+#define ALIGN_PTR_UP(p, ptr_align_to)	((typeof(p))ALIGN_UP((unsigned long)(p),	ptr_align_to))
+#define ALIGN_PTR_DOWN(p, ptr_align_to)	((typeof(p))ALIGN_DOWN((unsigned long)(p),	ptr_align_to))
+#define __stringify_1(x...)     #x
+#define __stringify(x...)       __stringify_1(x)
+
+#define PTR_ERR_ENOTSUP ((void *)-ENOTSUP)
+
+int dprint_in_signal;
+char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
+
+extern void abort_hooks(void);
+#define pkey_assert(condition) do {		\
+	if (!(condition)) {			\
+		dprintf0("assert() at %s::%d test_nr: %d iteration: %d\n", \
+				__FILE__, __LINE__,	\
+				test_nr, iteration_nr);	\
+		dprintf0("errno at assert: %d", errno);	\
+		abort_hooks();			\
+		exit(__LINE__);			\
+	}					\
+} while (0)
+
+void cat_into_file(char *str, char *file)
+{
+	int fd = open(file, O_RDWR);
+	int ret;
+
+	dprintf2("%s(): writing '%s' to '%s'\n", __func__, str, file);
+	/*
+	 * these need to be raw because they are called under
+	 * pkey_assert()
+	 */
+	if (fd < 0) {
+		fprintf(stderr, "error opening '%s'\n", str);
+		perror("error: ");
+		exit(__LINE__);
+	}
+
+	ret = write(fd, str, strlen(str));
+	if (ret != strlen(str)) {
+		perror("write to file failed");
+		fprintf(stderr, "filename: '%s' str: '%s'\n", file, str);
+		exit(__LINE__);
+	}
+	close(fd);
+}
+
+#if CONTROL_TRACING > 0
+static int warned_tracing;
+int tracing_root_ok(void)
+{
+	if (geteuid() != 0) {
+		if (!warned_tracing)
+			fprintf(stderr, "WARNING: not run as root, "
+					"can not do tracing control\n");
+		warned_tracing = 1;
+		return 0;
+	}
+	return 1;
+}
+#endif
+
+void tracing_on(void)
+{
+#if CONTROL_TRACING > 0
+#define TRACEDIR "/sys/kernel/debug/tracing"
+	char pidstr[32];
+
+	if (!tracing_root_ok())
+		return;
+
+	sprintf(pidstr, "%d", getpid());
+	cat_into_file("0", TRACEDIR "/tracing_on");
+	cat_into_file("\n", TRACEDIR "/trace");
+	if (1) {
+		cat_into_file("function_graph", TRACEDIR "/current_tracer");
+		cat_into_file("1", TRACEDIR "/options/funcgraph-proc");
+	} else {
+		cat_into_file("nop", TRACEDIR "/current_tracer");
+	}
+	cat_into_file(pidstr, TRACEDIR "/set_ftrace_pid");
+	cat_into_file("1", TRACEDIR "/tracing_on");
+	dprintf1("enabled tracing\n");
+#endif
+}
+
+void tracing_off(void)
+{
+#if CONTROL_TRACING > 0
+	if (!tracing_root_ok())
+		return;
+	cat_into_file("0", "/sys/kernel/debug/tracing/tracing_on");
+#endif
+}
+
+void abort_hooks(void)
+{
+	fprintf(stderr, "running %s()...\n", __func__);
+	tracing_off();
+#ifdef SLEEP_ON_ABORT
+	sleep(SLEEP_ON_ABORT);
+#endif
+}
+
+static inline void __page_o_noops(void)
+{
+	/* 8-bytes of instruction * 512 bytes = 1 page */
+	asm(".rept 512 ; nopl 0x7eeeeeee(%eax) ; .endr");
+}
+
+/*
+ * This attempts to have roughly a page of instructions followed by a few
+ * instructions that do a write, and another page of instructions.  That
+ * way, we are pretty sure that the write is in the second page of
+ * instructions and has at least a page of padding behind it.
+ *
+ * *That* lets us be sure to madvise() away the write instruction, which
+ * will then fault, which makes sure that the fault code handles
+ * execute-only memory properly.
+ */
+__attribute__((__aligned__(PAGE_SIZE)))
+void lots_o_noops_around_write(int *write_to_me)
+{
+	dprintf3("running %s()\n", __func__);
+	__page_o_noops();
+	/* Assume this happens in the second page of instructions: */
+	*write_to_me = __LINE__;
+	/* pad out by another page: */
+	__page_o_noops();
+	dprintf3("%s() done\n", __func__);
+}
+
+/* Define some kernel-like types */
+#define  u8 uint8_t
+#define u16 uint16_t
+#define u32 uint32_t
+#define u64 uint64_t
+
+#ifdef __i386__
+
+#ifndef SYS_mprotect_key
+# define SYS_mprotect_key	380
+#endif
+
+#ifndef SYS_pkey_alloc
+# define SYS_pkey_alloc		381
+# define SYS_pkey_free		382
+#endif
+
+#define REG_IP_IDX		REG_EIP
+#define si_pkey_offset		0x14
+
+#else
+
+#ifndef SYS_mprotect_key
+# define SYS_mprotect_key	329
+#endif
+
+#ifndef SYS_pkey_alloc
+# define SYS_pkey_alloc		330
+# define SYS_pkey_free		331
+#endif
+
+#define REG_IP_IDX		REG_RIP
+#define si_pkey_offset		0x20
+
+#endif
+
+void dump_mem(void *dumpme, int len_bytes)
+{
+	char *c = (void *)dumpme;
+	int i;
+
+	for (i = 0; i < len_bytes; i += sizeof(u64)) {
+		u64 *ptr = (u64 *)(c + i);
+		dprintf1("dump[%03d][@%p]: %016jx\n", i, ptr, *ptr);
+	}
+}
+
+/* Failed address bound checks: */
+#ifndef SEGV_BNDERR
+# define SEGV_BNDERR		3
+#endif
+
+#ifndef SEGV_PKUERR
+# define SEGV_PKUERR		4
+#endif
+
+static char *si_code_str(int si_code)
+{
+	if (si_code == SEGV_MAPERR)
+		return "SEGV_MAPERR";
+	if (si_code == SEGV_ACCERR)
+		return "SEGV_ACCERR";
+	if (si_code == SEGV_BNDERR)
+		return "SEGV_BNDERR";
+	if (si_code == SEGV_PKUERR)
+		return "SEGV_PKUERR";
+	return "UNKNOWN";
+}
+
+int pkru_faults;
+int last_si_pkey = -1;
+void signal_handler(int signum, siginfo_t *si, void *vucontext)
+{
+	ucontext_t *uctxt = vucontext;
+	int trapno;
+	unsigned long ip;
+	char *fpregs;
+	u32 *pkru_ptr;
+	u64 siginfo_pkey;
+	u32 *si_pkey_ptr;
+	int pkru_offset;
+	fpregset_t fpregset;
+
+	dprint_in_signal = 1;
+	dprintf1(">>>>===============SIGSEGV============================\n");
+	dprintf1("%s()::%d, pkru: 0x%x shadow: %x\n", __func__, __LINE__,
+			__rdpkru(), shadow_pkru);
+
+	trapno = uctxt->uc_mcontext.gregs[REG_TRAPNO];
+	ip = uctxt->uc_mcontext.gregs[REG_IP_IDX];
+	fpregset = uctxt->uc_mcontext.fpregs;
+	fpregs = (void *)fpregset;
+
+	dprintf2("%s() trapno: %d ip: 0x%lx info->si_code: %s/%d\n", __func__,
+			trapno, ip, si_code_str(si->si_code), si->si_code);
+#ifdef __i386__
+	/*
+	 * 32-bit has some extra padding so that userspace can tell whether
+	 * the XSTATE header is present in addition to the "legacy" FPU
+	 * state.  We just assume that it is here.
+	 */
+	fpregs += 0x70;
+#endif
+	pkru_offset = pkru_xstate_offset();
+	pkru_ptr = (void *)(&fpregs[pkru_offset]);
+
+	dprintf1("siginfo: %p\n", si);
+	dprintf1(" fpregs: %p\n", fpregs);
+	/*
+	 * If we got a PKRU fault, we *HAVE* to have at least one bit set in
+	 * here.
+	 */
+	dprintf1("pkru_xstate_offset: %d\n", pkru_xstate_offset());
+	if (DEBUG_LEVEL > 4)
+		dump_mem(pkru_ptr - 128, 256);
+	pkey_assert(*pkru_ptr);
+
+	if ((si->si_code == SEGV_MAPERR) ||
+	    (si->si_code == SEGV_ACCERR) ||
+	    (si->si_code == SEGV_BNDERR)) {
+		printf("non-PK si_code, exiting...\n");
+		exit(4);
+	}
+
+	si_pkey_ptr = (u32 *)(((u8 *)si) + si_pkey_offset);
+	dprintf1("si_pkey_ptr: %p\n", si_pkey_ptr);
+	dump_mem((u8 *)si_pkey_ptr - 8, 24);
+	siginfo_pkey = *si_pkey_ptr;
+	pkey_assert(siginfo_pkey < NR_PKEYS);
+	last_si_pkey = siginfo_pkey;
+
+	dprintf1("signal pkru from xsave: %08x\n", *pkru_ptr);
+	/* need __rdpkru() version so we do not do shadow_pkru checking */
+	dprintf1("signal pkru from  pkru: %08x\n", __rdpkru());
+	dprintf1("pkey from siginfo: %jx\n", siginfo_pkey);
+	*(u64 *)pkru_ptr = 0x00000000;
+	dprintf1("WARNING: set PRKU=0 to allow faulting instruction to continue\n");
+	pkru_faults++;
+	dprintf1("<<<<==================================================\n");
+	dprint_in_signal = 0;
+}
+
+int wait_all_children(void)
+{
+	int status;
+	return waitpid(-1, &status, 0);
+}
+
+void sig_chld(int x)
+{
+	dprint_in_signal = 1;
+	dprintf2("[%d] SIGCHLD: %d\n", getpid(), x);
+	dprint_in_signal = 0;
+}
+
+void setup_sigsegv_handler(void)
+{
+	int r, rs;
+	struct sigaction newact;
+	struct sigaction oldact;
+
+	/* #PF is mapped to sigsegv */
+	int signum  = SIGSEGV;
+
+	newact.sa_handler = 0;
+	newact.sa_sigaction = signal_handler;
+
+	/*sigset_t - signals to block while in the handler */
+	/* get the old signal mask. */
+	rs = sigprocmask(SIG_SETMASK, 0, &newact.sa_mask);
+	pkey_assert(rs == 0);
+
+	/* call sa_sigaction, not sa_handler*/
+	newact.sa_flags = SA_SIGINFO;
+
+	newact.sa_restorer = 0;  /* void(*)(), obsolete */
+	r = sigaction(signum, &newact, &oldact);
+	r = sigaction(SIGALRM, &newact, &oldact);
+	pkey_assert(r == 0);
+}
+
+void setup_handlers(void)
+{
+	signal(SIGCHLD, &sig_chld);
+	setup_sigsegv_handler();
+}
+
+pid_t fork_lazy_child(void)
+{
+	pid_t forkret;
+
+	forkret = fork();
+	pkey_assert(forkret >= 0);
+	dprintf3("[%d] fork() ret: %d\n", getpid(), forkret);
+
+	if (!forkret) {
+		/* in the child */
+		while (1) {
+			dprintf1("child sleeping...\n");
+			sleep(30);
+		}
+	}
+	return forkret;
+}
+
+#ifndef PKEY_DISABLE_ACCESS
+# define PKEY_DISABLE_ACCESS	0x1
+#endif
+
+#ifndef PKEY_DISABLE_WRITE
+# define PKEY_DISABLE_WRITE	0x2
+#endif
+
+static u32 hw_pkey_get(int pkey, unsigned long flags)
+{
+	u32 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
+	u32 pkru = __rdpkru();
+	u32 shifted_pkru;
+	u32 masked_pkru;
+
+	dprintf1("%s(pkey=%d, flags=%lx) = %x / %d\n",
+			__func__, pkey, flags, 0, 0);
+	dprintf2("%s() raw pkru: %x\n", __func__, pkru);
+
+	shifted_pkru = (pkru >> (pkey * PKRU_BITS_PER_PKEY));
+	dprintf2("%s() shifted_pkru: %x\n", __func__, shifted_pkru);
+	masked_pkru = shifted_pkru & mask;
+	dprintf2("%s() masked  pkru: %x\n", __func__, masked_pkru);
+	/*
+	 * shift down the relevant bits to the lowest two, then
+	 * mask off all the other high bits.
+	 */
+	return masked_pkru;
+}
+
+static int hw_pkey_set(int pkey, unsigned long rights, unsigned long flags)
+{
+	u32 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
+	u32 old_pkru = __rdpkru();
+	u32 new_pkru;
+
+	/* make sure that 'rights' only contains the bits we expect: */
+	assert(!(rights & ~mask));
+
+	/* copy old pkru */
+	new_pkru = old_pkru;
+	/* mask out bits from pkey in old value: */
+	new_pkru &= ~(mask << (pkey * PKRU_BITS_PER_PKEY));
+	/* OR in new bits for pkey: */
+	new_pkru |= (rights << (pkey * PKRU_BITS_PER_PKEY));
+
+	__wrpkru(new_pkru);
+
+	dprintf3("%s(pkey=%d, rights=%lx, flags=%lx) = %x pkru now: %x old_pkru: %x\n",
+			__func__, pkey, rights, flags, 0, __rdpkru(), old_pkru);
+	return 0;
+}
+
+void pkey_disable_set(int pkey, int flags)
+{
+	unsigned long syscall_flags = 0;
+	int ret;
+	int pkey_rights;
+	u32 orig_pkru = rdpkru();
+
+	dprintf1("START->%s(%d, 0x%x)\n", __func__,
+		pkey, flags);
+	pkey_assert(flags & (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE));
+
+	pkey_rights = hw_pkey_get(pkey, syscall_flags);
+
+	dprintf1("%s(%d) hw_pkey_get(%d): %x\n", __func__,
+			pkey, pkey, pkey_rights);
+	pkey_assert(pkey_rights >= 0);
+
+	pkey_rights |= flags;
+
+	ret = hw_pkey_set(pkey, pkey_rights, syscall_flags);
+	assert(!ret);
+	/*pkru and flags have the same format */
+	shadow_pkru |= flags << (pkey * 2);
+	dprintf1("%s(%d) shadow: 0x%x\n", __func__, pkey, shadow_pkru);
+
+	pkey_assert(ret >= 0);
+
+	pkey_rights = hw_pkey_get(pkey, syscall_flags);
+	dprintf1("%s(%d) hw_pkey_get(%d): %x\n", __func__,
+			pkey, pkey, pkey_rights);
+
+	dprintf1("%s(%d) pkru: 0x%x\n", __func__, pkey, rdpkru());
+	if (flags)
+		pkey_assert(rdpkru() > orig_pkru);
+	dprintf1("END<---%s(%d, 0x%x)\n", __func__,
+		pkey, flags);
+}
+
+void pkey_disable_clear(int pkey, int flags)
+{
+	unsigned long syscall_flags = 0;
+	int ret;
+	int pkey_rights = hw_pkey_get(pkey, syscall_flags);
+	u32 orig_pkru = rdpkru();
+
+	pkey_assert(flags & (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE));
+
+	dprintf1("%s(%d) hw_pkey_get(%d): %x\n", __func__,
+			pkey, pkey, pkey_rights);
+	pkey_assert(pkey_rights >= 0);
+
+	pkey_rights |= flags;
+
+	ret = hw_pkey_set(pkey, pkey_rights, 0);
+	/* pkru and flags have the same format */
+	shadow_pkru &= ~(flags << (pkey * 2));
+	pkey_assert(ret >= 0);
+
+	pkey_rights = hw_pkey_get(pkey, syscall_flags);
+	dprintf1("%s(%d) hw_pkey_get(%d): %x\n", __func__,
+			pkey, pkey, pkey_rights);
+
+	dprintf1("%s(%d) pkru: 0x%x\n", __func__, pkey, rdpkru());
+	if (flags)
+		assert(rdpkru() > orig_pkru);
+}
+
+void pkey_write_allow(int pkey)
+{
+	pkey_disable_clear(pkey, PKEY_DISABLE_WRITE);
+}
+void pkey_write_deny(int pkey)
+{
+	pkey_disable_set(pkey, PKEY_DISABLE_WRITE);
+}
+void pkey_access_allow(int pkey)
+{
+	pkey_disable_clear(pkey, PKEY_DISABLE_ACCESS);
+}
+void pkey_access_deny(int pkey)
+{
+	pkey_disable_set(pkey, PKEY_DISABLE_ACCESS);
+}
+
+int sys_mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
+		unsigned long pkey)
+{
+	int sret;
+
+	dprintf2("%s(0x%p, %zx, prot=%lx, pkey=%lx)\n", __func__,
+			ptr, size, orig_prot, pkey);
+
+	errno = 0;
+	sret = syscall(SYS_mprotect_key, ptr, size, orig_prot, pkey);
+	if (errno) {
+		dprintf2("SYS_mprotect_key sret: %d\n", sret);
+		dprintf2("SYS_mprotect_key prot: 0x%lx\n", orig_prot);
+		dprintf2("SYS_mprotect_key failed, errno: %d\n", errno);
+		if (DEBUG_LEVEL >= 2)
+			perror("SYS_mprotect_pkey");
+	}
+	return sret;
+}
+
+int sys_pkey_alloc(unsigned long flags, unsigned long init_val)
+{
+	int ret = syscall(SYS_pkey_alloc, flags, init_val);
+	dprintf1("%s(flags=%lx, init_val=%lx) syscall ret: %d errno: %d\n",
+			__func__, flags, init_val, ret, errno);
+	return ret;
+}
+
+int alloc_pkey(void)
+{
+	int ret;
+	unsigned long init_val = 0x0;
+
+	dprintf1("alloc_pkey()::%d, pkru: 0x%x shadow: %x\n",
+			__LINE__, __rdpkru(), shadow_pkru);
+	ret = sys_pkey_alloc(0, init_val);
+	/*
+	 * pkey_alloc() sets PKRU, so we need to reflect it in
+	 * shadow_pkru:
+	 */
+	dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
+			__LINE__, ret, __rdpkru(), shadow_pkru);
+	if (ret) {
+		/* clear both the bits: */
+		shadow_pkru &= ~(0x3      << (ret * 2));
+		dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
+				__LINE__, ret, __rdpkru(), shadow_pkru);
+		/*
+		 * move the new state in from init_val
+		 * (remember, we cheated and init_val == pkru format)
+		 */
+		shadow_pkru |=  (init_val << (ret * 2));
+	}
+	dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
+			__LINE__, ret, __rdpkru(), shadow_pkru);
+	dprintf1("alloc_pkey()::%d errno: %d\n", __LINE__, errno);
+	/* for shadow checking: */
+	rdpkru();
+	dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
+			__LINE__, ret, __rdpkru(), shadow_pkru);
+	return ret;
+}
+
+int sys_pkey_free(unsigned long pkey)
+{
+	int ret = syscall(SYS_pkey_free, pkey);
+	dprintf1("%s(pkey=%ld) syscall ret: %d\n", __func__, pkey, ret);
+	return ret;
+}
+
+/*
+ * I had a bug where pkey bits could be set by mprotect() but
+ * not cleared.  This ensures we get lots of random bit sets
+ * and clears on the vma and pte pkey bits.
+ */
+int alloc_random_pkey(void)
+{
+	int max_nr_pkey_allocs;
+	int ret;
+	int i;
+	int alloced_pkeys[NR_PKEYS];
+	int nr_alloced = 0;
+	int random_index;
+	memset(alloced_pkeys, 0, sizeof(alloced_pkeys));
+
+	/* allocate every possible key and make a note of which ones we got */
+	max_nr_pkey_allocs = NR_PKEYS;
+	max_nr_pkey_allocs = 1;
+	for (i = 0; i < max_nr_pkey_allocs; i++) {
+		int new_pkey = alloc_pkey();
+		if (new_pkey < 0)
+			break;
+		alloced_pkeys[nr_alloced++] = new_pkey;
+	}
+
+	pkey_assert(nr_alloced > 0);
+	/* select a random one out of the allocated ones */
+	random_index = rand() % nr_alloced;
+	ret = alloced_pkeys[random_index];
+	/* now zero it out so we don't free it next */
+	alloced_pkeys[random_index] = 0;
+
+	/* go through the allocated ones that we did not want and free them */
+	for (i = 0; i < nr_alloced; i++) {
+		int free_ret;
+		if (!alloced_pkeys[i])
+			continue;
+		free_ret = sys_pkey_free(alloced_pkeys[i]);
+		pkey_assert(!free_ret);
+	}
+	dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
+			__LINE__, ret, __rdpkru(), shadow_pkru);
+	return ret;
+}
+
+int mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
+		unsigned long pkey)
+{
+	int nr_iterations = random() % 100;
+	int ret;
+
+	while (0) {
+		int rpkey = alloc_random_pkey();
+		ret = sys_mprotect_pkey(ptr, size, orig_prot, pkey);
+		dprintf1("sys_mprotect_pkey(%p, %zx, prot=0x%lx, pkey=%ld) ret: %d\n",
+				ptr, size, orig_prot, pkey, ret);
+		if (nr_iterations-- < 0)
+			break;
+
+		dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
+			__LINE__, ret, __rdpkru(), shadow_pkru);
+		sys_pkey_free(rpkey);
+		dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
+			__LINE__, ret, __rdpkru(), shadow_pkru);
+	}
+	pkey_assert(pkey < NR_PKEYS);
+
+	ret = sys_mprotect_pkey(ptr, size, orig_prot, pkey);
+	dprintf1("mprotect_pkey(%p, %zx, prot=0x%lx, pkey=%ld) ret: %d\n",
+			ptr, size, orig_prot, pkey, ret);
+	pkey_assert(!ret);
+	dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
+			__LINE__, ret, __rdpkru(), shadow_pkru);
+	return ret;
+}
+
+struct pkey_malloc_record {
+	void *ptr;
+	long size;
+	int prot;
+};
+struct pkey_malloc_record *pkey_malloc_records;
+struct pkey_malloc_record *pkey_last_malloc_record;
+long nr_pkey_malloc_records;
+void record_pkey_malloc(void *ptr, long size, int prot)
+{
+	long i;
+	struct pkey_malloc_record *rec = NULL;
+
+	for (i = 0; i < nr_pkey_malloc_records; i++) {
+		rec = &pkey_malloc_records[i];
+		/* find a free record */
+		if (rec)
+			break;
+	}
+	if (!rec) {
+		/* every record is full */
+		size_t old_nr_records = nr_pkey_malloc_records;
+		size_t new_nr_records = (nr_pkey_malloc_records * 2 + 1);
+		size_t new_size = new_nr_records * sizeof(struct pkey_malloc_record);
+		dprintf2("new_nr_records: %zd\n", new_nr_records);
+		dprintf2("new_size: %zd\n", new_size);
+		pkey_malloc_records = realloc(pkey_malloc_records, new_size);
+		pkey_assert(pkey_malloc_records != NULL);
+		rec = &pkey_malloc_records[nr_pkey_malloc_records];
+		/*
+		 * realloc() does not initialize memory, so zero it from
+		 * the first new record all the way to the end.
+		 */
+		for (i = 0; i < new_nr_records - old_nr_records; i++)
+			memset(rec + i, 0, sizeof(*rec));
+	}
+	dprintf3("filling malloc record[%d/%p]: {%p, %ld}\n",
+		(int)(rec - pkey_malloc_records), rec, ptr, size);
+	rec->ptr = ptr;
+	rec->size = size;
+	rec->prot = prot;
+	pkey_last_malloc_record = rec;
+	nr_pkey_malloc_records++;
+}
+
+void free_pkey_malloc(void *ptr)
+{
+	long i;
+	int ret;
+	dprintf3("%s(%p)\n", __func__, ptr);
+	for (i = 0; i < nr_pkey_malloc_records; i++) {
+		struct pkey_malloc_record *rec = &pkey_malloc_records[i];
+		dprintf4("looking for ptr %p at record[%ld/%p]: {%p, %ld}\n",
+				ptr, i, rec, rec->ptr, rec->size);
+		if ((ptr <  rec->ptr) ||
+		    (ptr >= rec->ptr + rec->size))
+			continue;
+
+		dprintf3("found ptr %p at record[%ld/%p]: {%p, %ld}\n",
+				ptr, i, rec, rec->ptr, rec->size);
+		nr_pkey_malloc_records--;
+		ret = munmap(rec->ptr, rec->size);
+		dprintf3("munmap ret: %d\n", ret);
+		pkey_assert(!ret);
+		dprintf3("clearing rec->ptr, rec: %p\n", rec);
+		rec->ptr = NULL;
+		dprintf3("done clearing rec->ptr, rec: %p\n", rec);
+		return;
+	}
+	pkey_assert(false);
+}
+
+
+void *malloc_pkey_with_mprotect(long size, int prot, u16 pkey)
+{
+	void *ptr;
+	int ret;
+
+	rdpkru();
+	dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
+			size, prot, pkey);
+	pkey_assert(pkey < NR_PKEYS);
+	ptr = mmap(NULL, size, prot, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+	pkey_assert(ptr != (void *)-1);
+	ret = mprotect_pkey((void *)ptr, PAGE_SIZE, prot, pkey);
+	pkey_assert(!ret);
+	record_pkey_malloc(ptr, size, prot);
+	rdpkru();
+
+	dprintf1("%s() for pkey %d @ %p\n", __func__, pkey, ptr);
+	return ptr;
+}
+
+void *malloc_pkey_anon_huge(long size, int prot, u16 pkey)
+{
+	int ret;
+	void *ptr;
+
+	dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
+			size, prot, pkey);
+	/*
+	 * Guarantee we can fit at least one huge page in the resulting
+	 * allocation by allocating space for 2:
+	 */
+	size = ALIGN_UP(size, HPAGE_SIZE * 2);
+	ptr = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+	pkey_assert(ptr != (void *)-1);
+	record_pkey_malloc(ptr, size, prot);
+	mprotect_pkey(ptr, size, prot, pkey);
+
+	dprintf1("unaligned ptr: %p\n", ptr);
+	ptr = ALIGN_PTR_UP(ptr, HPAGE_SIZE);
+	dprintf1("  aligned ptr: %p\n", ptr);
+	ret = madvise(ptr, HPAGE_SIZE, MADV_HUGEPAGE);
+	dprintf1("MADV_HUGEPAGE ret: %d\n", ret);
+	ret = madvise(ptr, HPAGE_SIZE, MADV_WILLNEED);
+	dprintf1("MADV_WILLNEED ret: %d\n", ret);
+	memset(ptr, 0, HPAGE_SIZE);
+
+	dprintf1("mmap()'d thp for pkey %d @ %p\n", pkey, ptr);
+	return ptr;
+}
+
+int hugetlb_setup_ok;
+#define GET_NR_HUGE_PAGES 10
+void setup_hugetlbfs(void)
+{
+	int err;
+	int fd;
+	char buf[] = "123";
+
+	if (geteuid() != 0) {
+		fprintf(stderr, "WARNING: not run as root, can not do hugetlb test\n");
+		return;
+	}
+
+	cat_into_file(__stringify(GET_NR_HUGE_PAGES), "/proc/sys/vm/nr_hugepages");
+
+	/*
+	 * Now go make sure that we got the pages and that they
+	 * are 2M pages.  Someone might have made 1G the default.
+	 */
+	fd = open("/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages", O_RDONLY);
+	if (fd < 0) {
+		perror("opening sysfs 2M hugetlb config");
+		return;
+	}
+
+	/* -1 to guarantee leaving the trailing \0 */
+	err = read(fd, buf, sizeof(buf)-1);
+	close(fd);
+	if (err <= 0) {
+		perror("reading sysfs 2M hugetlb config");
+		return;
+	}
+
+	if (atoi(buf) != GET_NR_HUGE_PAGES) {
+		fprintf(stderr, "could not confirm 2M pages, got: '%s' expected %d\n",
+			buf, GET_NR_HUGE_PAGES);
+		return;
+	}
+
+	hugetlb_setup_ok = 1;
+}
+
+void *malloc_pkey_hugetlb(long size, int prot, u16 pkey)
+{
+	void *ptr;
+	int flags = MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB;
+
+	if (!hugetlb_setup_ok)
+		return PTR_ERR_ENOTSUP;
+
+	dprintf1("doing %s(%ld, %x, %x)\n", __func__, size, prot, pkey);
+	size = ALIGN_UP(size, HPAGE_SIZE * 2);
+	pkey_assert(pkey < NR_PKEYS);
+	ptr = mmap(NULL, size, PROT_NONE, flags, -1, 0);
+	pkey_assert(ptr != (void *)-1);
+	mprotect_pkey(ptr, size, prot, pkey);
+
+	record_pkey_malloc(ptr, size, prot);
+
+	dprintf1("mmap()'d hugetlbfs for pkey %d @ %p\n", pkey, ptr);
+	return ptr;
+}
+
+void *malloc_pkey_mmap_dax(long size, int prot, u16 pkey)
+{
+	void *ptr;
+	int fd;
+
+	dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
+			size, prot, pkey);
+	pkey_assert(pkey < NR_PKEYS);
+	fd = open("/dax/foo", O_RDWR);
+	pkey_assert(fd >= 0);
+
+	ptr = mmap(0, size, prot, MAP_SHARED, fd, 0);
+	pkey_assert(ptr != (void *)-1);
+
+	mprotect_pkey(ptr, size, prot, pkey);
+
+	record_pkey_malloc(ptr, size, prot);
+
+	dprintf1("mmap()'d for pkey %d @ %p\n", pkey, ptr);
+	close(fd);
+	return ptr;
+}
+
+void *(*pkey_malloc[])(long size, int prot, u16 pkey) = {
+
+	malloc_pkey_with_mprotect,
+	malloc_pkey_anon_huge,
+	malloc_pkey_hugetlb
+/* can not do direct with the pkey_mprotect() API:
+	malloc_pkey_mmap_direct,
+	malloc_pkey_mmap_dax,
+*/
+};
+
+void *malloc_pkey(long size, int prot, u16 pkey)
+{
+	void *ret;
+	static int malloc_type;
+	int nr_malloc_types = ARRAY_SIZE(pkey_malloc);
+
+	pkey_assert(pkey < NR_PKEYS);
+
+	while (1) {
+		pkey_assert(malloc_type < nr_malloc_types);
+
+		ret = pkey_malloc[malloc_type](size, prot, pkey);
+		pkey_assert(ret != (void *)-1);
+
+		malloc_type++;
+		if (malloc_type >= nr_malloc_types)
+			malloc_type = (random()%nr_malloc_types);
+
+		/* try again if the malloc_type we tried is unsupported */
+		if (ret == PTR_ERR_ENOTSUP)
+			continue;
+
+		break;
+	}
+
+	dprintf3("%s(%ld, prot=%x, pkey=%x) returning: %p\n", __func__,
+			size, prot, pkey, ret);
+	return ret;
+}
+
+int last_pkru_faults;
+#define UNKNOWN_PKEY -2
+void expected_pk_fault(int pkey)
+{
+	dprintf2("%s(): last_pkru_faults: %d pkru_faults: %d\n",
+			__func__, last_pkru_faults, pkru_faults);
+	dprintf2("%s(%d): last_si_pkey: %d\n", __func__, pkey, last_si_pkey);
+	pkey_assert(last_pkru_faults + 1 == pkru_faults);
+
+       /*
+	* For exec-only memory, we do not know the pkey in
+	* advance, so skip this check.
+	*/
+	if (pkey != UNKNOWN_PKEY)
+		pkey_assert(last_si_pkey == pkey);
+
+	/*
+	 * The signal handler shold have cleared out PKRU to let the
+	 * test program continue.  We now have to restore it.
+	 */
+	if (__rdpkru() != 0)
+		pkey_assert(0);
+
+	__wrpkru(shadow_pkru);
+	dprintf1("%s() set PKRU=%x to restore state after signal nuked it\n",
+			__func__, shadow_pkru);
+	last_pkru_faults = pkru_faults;
+	last_si_pkey = -1;
+}
+
+#define do_not_expect_pk_fault(msg)	do {			\
+	if (last_pkru_faults != pkru_faults)			\
+		dprintf0("unexpected PK fault: %s\n", msg);	\
+	pkey_assert(last_pkru_faults == pkru_faults);		\
+} while (0)
+
+int test_fds[10] = { -1 };
+int nr_test_fds;
+void __save_test_fd(int fd)
+{
+	pkey_assert(fd >= 0);
+	pkey_assert(nr_test_fds < ARRAY_SIZE(test_fds));
+	test_fds[nr_test_fds] = fd;
+	nr_test_fds++;
+}
+
+int get_test_read_fd(void)
+{
+	int test_fd = open("/etc/passwd", O_RDONLY);
+	__save_test_fd(test_fd);
+	return test_fd;
+}
+
+void close_test_fds(void)
+{
+	int i;
+
+	for (i = 0; i < nr_test_fds; i++) {
+		if (test_fds[i] < 0)
+			continue;
+		close(test_fds[i]);
+		test_fds[i] = -1;
+	}
+	nr_test_fds = 0;
+}
+
+#define barrier() __asm__ __volatile__("": : :"memory")
+__attribute__((noinline)) int read_ptr(int *ptr)
+{
+	/*
+	 * Keep GCC from optimizing this away somehow
+	 */
+	barrier();
+	return *ptr;
+}
+
+void test_read_of_write_disabled_region(int *ptr, u16 pkey)
+{
+	int ptr_contents;
+
+	dprintf1("disabling write access to PKEY[1], doing read\n");
+	pkey_write_deny(pkey);
+	ptr_contents = read_ptr(ptr);
+	dprintf1("*ptr: %d\n", ptr_contents);
+	dprintf1("\n");
+}
+void test_read_of_access_disabled_region(int *ptr, u16 pkey)
+{
+	int ptr_contents;
+
+	dprintf1("disabling access to PKEY[%02d], doing read @ %p\n", pkey, ptr);
+	rdpkru();
+	pkey_access_deny(pkey);
+	ptr_contents = read_ptr(ptr);
+	dprintf1("*ptr: %d\n", ptr_contents);
+	expected_pk_fault(pkey);
+}
+void test_write_of_write_disabled_region(int *ptr, u16 pkey)
+{
+	dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);
+	pkey_write_deny(pkey);
+	*ptr = __LINE__;
+	expected_pk_fault(pkey);
+}
+void test_write_of_access_disabled_region(int *ptr, u16 pkey)
+{
+	dprintf1("disabling access to PKEY[%02d], doing write\n", pkey);
+	pkey_access_deny(pkey);
+	*ptr = __LINE__;
+	expected_pk_fault(pkey);
+}
+void test_kernel_write_of_access_disabled_region(int *ptr, u16 pkey)
+{
+	int ret;
+	int test_fd = get_test_read_fd();
+
+	dprintf1("disabling access to PKEY[%02d], "
+		 "having kernel read() to buffer\n", pkey);
+	pkey_access_deny(pkey);
+	ret = read(test_fd, ptr, 1);
+	dprintf1("read ret: %d\n", ret);
+	pkey_assert(ret);
+}
+void test_kernel_write_of_write_disabled_region(int *ptr, u16 pkey)
+{
+	int ret;
+	int test_fd = get_test_read_fd();
+
+	pkey_write_deny(pkey);
+	ret = read(test_fd, ptr, 100);
+	dprintf1("read ret: %d\n", ret);
+	if (ret < 0 && (DEBUG_LEVEL > 0))
+		perror("verbose read result (OK for this to be bad)");
+	pkey_assert(ret);
+}
+
+void test_kernel_gup_of_access_disabled_region(int *ptr, u16 pkey)
+{
+	int pipe_ret, vmsplice_ret;
+	struct iovec iov;
+	int pipe_fds[2];
+
+	pipe_ret = pipe(pipe_fds);
+
+	pkey_assert(pipe_ret == 0);
+	dprintf1("disabling access to PKEY[%02d], "
+		 "having kernel vmsplice from buffer\n", pkey);
+	pkey_access_deny(pkey);
+	iov.iov_base = ptr;
+	iov.iov_len = PAGE_SIZE;
+	vmsplice_ret = vmsplice(pipe_fds[1], &iov, 1, SPLICE_F_GIFT);
+	dprintf1("vmsplice() ret: %d\n", vmsplice_ret);
+	pkey_assert(vmsplice_ret == -1);
+
+	close(pipe_fds[0]);
+	close(pipe_fds[1]);
+}
+
+void test_kernel_gup_write_to_write_disabled_region(int *ptr, u16 pkey)
+{
+	int ignored = 0xdada;
+	int futex_ret;
+	int some_int = __LINE__;
+
+	dprintf1("disabling write to PKEY[%02d], "
+		 "doing futex gunk in buffer\n", pkey);
+	*ptr = some_int;
+	pkey_write_deny(pkey);
+	futex_ret = syscall(SYS_futex, ptr, FUTEX_WAIT, some_int-1, NULL,
+			&ignored, ignored);
+	if (DEBUG_LEVEL > 0)
+		perror("futex");
+	dprintf1("futex() ret: %d\n", futex_ret);
+}
+
+/* Assumes that all pkeys other than 'pkey' are unallocated */
+void test_pkey_syscalls_on_non_allocated_pkey(int *ptr, u16 pkey)
+{
+	int err;
+	int i;
+
+	/* Note: 0 is the default pkey, so don't mess with it */
+	for (i = 1; i < NR_PKEYS; i++) {
+		if (pkey == i)
+			continue;
+
+		dprintf1("trying get/set/free to non-allocated pkey: %2d\n", i);
+		err = sys_pkey_free(i);
+		pkey_assert(err);
+
+		err = sys_pkey_free(i);
+		pkey_assert(err);
+
+		err = sys_mprotect_pkey(ptr, PAGE_SIZE, PROT_READ, i);
+		pkey_assert(err);
+	}
+}
+
+/* Assumes that all pkeys other than 'pkey' are unallocated */
+void test_pkey_syscalls_bad_args(int *ptr, u16 pkey)
+{
+	int err;
+	int bad_pkey = NR_PKEYS+99;
+
+	/* pass a known-invalid pkey in: */
+	err = sys_mprotect_pkey(ptr, PAGE_SIZE, PROT_READ, bad_pkey);
+	pkey_assert(err);
+}
+
+/* Assumes that all pkeys other than 'pkey' are unallocated */
+void test_pkey_alloc_exhaust(int *ptr, u16 pkey)
+{
+	int err;
+	int allocated_pkeys[NR_PKEYS] = {0};
+	int nr_allocated_pkeys = 0;
+	int i;
+
+	for (i = 0; i < NR_PKEYS*2; i++) {
+		int new_pkey;
+		dprintf1("%s() alloc loop: %d\n", __func__, i);
+		new_pkey = alloc_pkey();
+		dprintf4("%s()::%d, err: %d pkru: 0x%x shadow: 0x%x\n", __func__,
+				__LINE__, err, __rdpkru(), shadow_pkru);
+		rdpkru(); /* for shadow checking */
+		dprintf2("%s() errno: %d ENOSPC: %d\n", __func__, errno, ENOSPC);
+		if ((new_pkey == -1) && (errno == ENOSPC)) {
+			dprintf2("%s() failed to allocate pkey after %d tries\n",
+				__func__, nr_allocated_pkeys);
+			break;
+		}
+		pkey_assert(nr_allocated_pkeys < NR_PKEYS);
+		allocated_pkeys[nr_allocated_pkeys++] = new_pkey;
+	}
+
+	dprintf3("%s()::%d\n", __func__, __LINE__);
+
+	/*
+	 * ensure it did not reach the end of the loop without
+	 * failure:
+	 */
+	pkey_assert(i < NR_PKEYS*2);
+
+	/*
+	 * There are 16 pkeys supported in hardware.  Three are
+	 * allocated by the time we get here:
+	 *   1. The default key (0)
+	 *   2. One possibly consumed by an execute-only mapping.
+	 *   3. One allocated by the test code and passed in via
+	 *      'pkey' to this function.
+	 * Ensure that we can allocate at least another 13 (16-3).
+	 */
+	pkey_assert(i >= NR_PKEYS-3);
+
+	for (i = 0; i < nr_allocated_pkeys; i++) {
+		err = sys_pkey_free(allocated_pkeys[i]);
+		pkey_assert(!err);
+		rdpkru(); /* for shadow checking */
+	}
+}
+
+/*
+ * pkey 0 is special.  It is allocated by default, so you do not
+ * have to call pkey_alloc() to use it first.  Make sure that it
+ * is usable.
+ */
+void test_mprotect_with_pkey_0(int *ptr, u16 pkey)
+{
+	long size;
+	int prot;
+
+	assert(pkey_last_malloc_record);
+	size = pkey_last_malloc_record->size;
+	/*
+	 * This is a bit of a hack.  But mprotect() requires
+	 * huge-page-aligned sizes when operating on hugetlbfs.
+	 * So, make sure that we use something that's a multiple
+	 * of a huge page when we can.
+	 */
+	if (size >= HPAGE_SIZE)
+		size = HPAGE_SIZE;
+	prot = pkey_last_malloc_record->prot;
+
+	/* Use pkey 0 */
+	mprotect_pkey(ptr, size, prot, 0);
+
+	/* Make sure that we can set it back to the original pkey. */
+	mprotect_pkey(ptr, size, prot, pkey);
+}
+
+void test_ptrace_of_child(int *ptr, u16 pkey)
+{
+	__attribute__((__unused__)) int peek_result;
+	pid_t child_pid;
+	void *ignored = 0;
+	long ret;
+	int status;
+	/*
+	 * This is the "control" for our little expermient.  Make sure
+	 * we can always access it when ptracing.
+	 */
+	int *plain_ptr_unaligned = malloc(HPAGE_SIZE);
+	int *plain_ptr = ALIGN_PTR_UP(plain_ptr_unaligned, PAGE_SIZE);
+
+	/*
+	 * Fork a child which is an exact copy of this process, of course.
+	 * That means we can do all of our tests via ptrace() and then plain
+	 * memory access and ensure they work differently.
+	 */
+	child_pid = fork_lazy_child();
+	dprintf1("[%d] child pid: %d\n", getpid(), child_pid);
+
+	ret = ptrace(PTRACE_ATTACH, child_pid, ignored, ignored);
+	if (ret)
+		perror("attach");
+	dprintf1("[%d] attach ret: %ld %d\n", getpid(), ret, __LINE__);
+	pkey_assert(ret != -1);
+	ret = waitpid(child_pid, &status, WUNTRACED);
+	if ((ret != child_pid) || !(WIFSTOPPED(status))) {
+		fprintf(stderr, "weird waitpid result %ld stat %x\n",
+				ret, status);
+		pkey_assert(0);
+	}
+	dprintf2("waitpid ret: %ld\n", ret);
+	dprintf2("waitpid status: %d\n", status);
+
+	pkey_access_deny(pkey);
+	pkey_write_deny(pkey);
+
+	/* Write access, untested for now:
+	ret = ptrace(PTRACE_POKEDATA, child_pid, peek_at, data);
+	pkey_assert(ret != -1);
+	dprintf1("poke at %p: %ld\n", peek_at, ret);
+	*/
+
+	/*
+	 * Try to access the pkey-protected "ptr" via ptrace:
+	 */
+	ret = ptrace(PTRACE_PEEKDATA, child_pid, ptr, ignored);
+	/* expect it to work, without an error: */
+	pkey_assert(ret != -1);
+	/* Now access from the current task, and expect an exception: */
+	peek_result = read_ptr(ptr);
+	expected_pk_fault(pkey);
+
+	/*
+	 * Try to access the NON-pkey-protected "plain_ptr" via ptrace:
+	 */
+	ret = ptrace(PTRACE_PEEKDATA, child_pid, plain_ptr, ignored);
+	/* expect it to work, without an error: */
+	pkey_assert(ret != -1);
+	/* Now access from the current task, and expect NO exception: */
+	peek_result = read_ptr(plain_ptr);
+	do_not_expect_pk_fault("read plain pointer after ptrace");
+
+	ret = ptrace(PTRACE_DETACH, child_pid, ignored, 0);
+	pkey_assert(ret != -1);
+
+	ret = kill(child_pid, SIGKILL);
+	pkey_assert(ret != -1);
+
+	wait(&status);
+
+	free(plain_ptr_unaligned);
+}
+
+void *get_pointer_to_instructions(void)
+{
+	void *p1;
+
+	p1 = ALIGN_PTR_UP(&lots_o_noops_around_write, PAGE_SIZE);
+	dprintf3("&lots_o_noops: %p\n", &lots_o_noops_around_write);
+	/* lots_o_noops_around_write should be page-aligned already */
+	assert(p1 == &lots_o_noops_around_write);
+
+	/* Point 'p1' at the *second* page of the function: */
+	p1 += PAGE_SIZE;
+
+	/*
+	 * Try to ensure we fault this in on next touch to ensure
+	 * we get an instruction fault as opposed to a data one
+	 */
+	madvise(p1, PAGE_SIZE, MADV_DONTNEED);
+
+	return p1;
+}
+
+void test_executing_on_unreadable_memory(int *ptr, u16 pkey)
+{
+	void *p1;
+	int scratch;
+	int ptr_contents;
+	int ret;
+
+	p1 = get_pointer_to_instructions();
+	lots_o_noops_around_write(&scratch);
+	ptr_contents = read_ptr(p1);
+	dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
+
+	ret = mprotect_pkey(p1, PAGE_SIZE, PROT_EXEC, (u64)pkey);
+	pkey_assert(!ret);
+	pkey_access_deny(pkey);
+
+	dprintf2("pkru: %x\n", rdpkru());
+
+	/*
+	 * Make sure this is an *instruction* fault
+	 */
+	madvise(p1, PAGE_SIZE, MADV_DONTNEED);
+	lots_o_noops_around_write(&scratch);
+	do_not_expect_pk_fault("executing on PROT_EXEC memory");
+	ptr_contents = read_ptr(p1);
+	dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
+	expected_pk_fault(pkey);
+}
+
+void test_implicit_mprotect_exec_only_memory(int *ptr, u16 pkey)
+{
+	void *p1;
+	int scratch;
+	int ptr_contents;
+	int ret;
+
+	dprintf1("%s() start\n", __func__);
+
+	p1 = get_pointer_to_instructions();
+	lots_o_noops_around_write(&scratch);
+	ptr_contents = read_ptr(p1);
+	dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
+
+	/* Use a *normal* mprotect(), not mprotect_pkey(): */
+	ret = mprotect(p1, PAGE_SIZE, PROT_EXEC);
+	pkey_assert(!ret);
+
+	dprintf2("pkru: %x\n", rdpkru());
+
+	/* Make sure this is an *instruction* fault */
+	madvise(p1, PAGE_SIZE, MADV_DONTNEED);
+	lots_o_noops_around_write(&scratch);
+	do_not_expect_pk_fault("executing on PROT_EXEC memory");
+	ptr_contents = read_ptr(p1);
+	dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
+	expected_pk_fault(UNKNOWN_PKEY);
+
+	/*
+	 * Put the memory back to non-PROT_EXEC.  Should clear the
+	 * exec-only pkey off the VMA and allow it to be readable
+	 * again.  Go to PROT_NONE first to check for a kernel bug
+	 * that did not clear the pkey when doing PROT_NONE.
+	 */
+	ret = mprotect(p1, PAGE_SIZE, PROT_NONE);
+	pkey_assert(!ret);
+
+	ret = mprotect(p1, PAGE_SIZE, PROT_READ|PROT_EXEC);
+	pkey_assert(!ret);
+	ptr_contents = read_ptr(p1);
+	do_not_expect_pk_fault("plain read on recently PROT_EXEC area");
+}
+
+void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
+{
+	int size = PAGE_SIZE;
+	int sret;
+
+	if (cpu_has_pku()) {
+		dprintf1("SKIP: %s: no CPU support\n", __func__);
+		return;
+	}
+
+	sret = syscall(SYS_mprotect_key, ptr, size, PROT_READ, pkey);
+	pkey_assert(sret < 0);
+}
+
+void (*pkey_tests[])(int *ptr, u16 pkey) = {
+	test_read_of_write_disabled_region,
+	test_read_of_access_disabled_region,
+	test_write_of_write_disabled_region,
+	test_write_of_access_disabled_region,
+	test_kernel_write_of_access_disabled_region,
+	test_kernel_write_of_write_disabled_region,
+	test_kernel_gup_of_access_disabled_region,
+	test_kernel_gup_write_to_write_disabled_region,
+	test_executing_on_unreadable_memory,
+	test_implicit_mprotect_exec_only_memory,
+	test_mprotect_with_pkey_0,
+	test_ptrace_of_child,
+	test_pkey_syscalls_on_non_allocated_pkey,
+	test_pkey_syscalls_bad_args,
+	test_pkey_alloc_exhaust,
+};
+
+void run_tests_once(void)
+{
+	int *ptr;
+	int prot = PROT_READ|PROT_WRITE;
+
+	for (test_nr = 0; test_nr < ARRAY_SIZE(pkey_tests); test_nr++) {
+		int pkey;
+		int orig_pkru_faults = pkru_faults;
+
+		dprintf1("======================\n");
+		dprintf1("test %d preparing...\n", test_nr);
+
+		tracing_on();
+		pkey = alloc_random_pkey();
+		dprintf1("test %d starting with pkey: %d\n", test_nr, pkey);
+		ptr = malloc_pkey(PAGE_SIZE, prot, pkey);
+		dprintf1("test %d starting...\n", test_nr);
+		pkey_tests[test_nr](ptr, pkey);
+		dprintf1("freeing test memory: %p\n", ptr);
+		free_pkey_malloc(ptr);
+		sys_pkey_free(pkey);
+
+		dprintf1("pkru_faults: %d\n", pkru_faults);
+		dprintf1("orig_pkru_faults: %d\n", orig_pkru_faults);
+
+		tracing_off();
+		close_test_fds();
+
+		printf("test %2d PASSED (iteration %d)\n", test_nr, iteration_nr);
+		dprintf1("======================\n\n");
+	}
+	iteration_nr++;
+}
+
+void pkey_setup_shadow(void)
+{
+	shadow_pkru = __rdpkru();
+}
+
+int main(void)
+{
+	int nr_iterations = 22;
+
+	setup_handlers();
+
+	printf("has pku: %d\n", cpu_has_pku());
+
+	if (!cpu_has_pku()) {
+		int size = PAGE_SIZE;
+		int *ptr;
+
+		printf("running PKEY tests for unsupported CPU/OS\n");
+
+		ptr  = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+		assert(ptr != (void *)-1);
+		test_mprotect_pkey_on_unsupported_cpu(ptr, 1);
+		exit(0);
+	}
+
+	pkey_setup_shadow();
+	printf("startup pkru: %x\n", rdpkru());
+	setup_hugetlbfs();
+
+	while (nr_iterations-- > 0)
+		run_tests_once();
+
+	printf("done (all tests OK)\n");
+	return 0;
+}
diff --git a/tools/testing/selftests/x86/.gitignore b/tools/testing/selftests/x86/.gitignore
index 7757f73..eb30ffd 100644
--- a/tools/testing/selftests/x86/.gitignore
+++ b/tools/testing/selftests/x86/.gitignore
@@ -11,5 +11,4 @@ ldt_gdt
 iopl
 mpx-mini-test
 ioperm
-protection_keys
 test_vdso
diff --git a/tools/testing/selftests/x86/pkey-helpers.h b/tools/testing/selftests/x86/pkey-helpers.h
deleted file mode 100644
index 254e543..0000000
--- a/tools/testing/selftests/x86/pkey-helpers.h
+++ /dev/null
@@ -1,219 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _PKEYS_HELPER_H
-#define _PKEYS_HELPER_H
-#define _GNU_SOURCE
-#include <string.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdint.h>
-#include <stdbool.h>
-#include <signal.h>
-#include <assert.h>
-#include <stdlib.h>
-#include <ucontext.h>
-#include <sys/mman.h>
-
-#define NR_PKEYS 16
-#define PKRU_BITS_PER_PKEY 2
-
-#ifndef DEBUG_LEVEL
-#define DEBUG_LEVEL 0
-#endif
-#define DPRINT_IN_SIGNAL_BUF_SIZE 4096
-extern int dprint_in_signal;
-extern char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
-static inline void sigsafe_printf(const char *format, ...)
-{
-	va_list ap;
-
-	if (!dprint_in_signal) {
-		va_start(ap, format);
-		vprintf(format, ap);
-		va_end(ap);
-	} else {
-		int ret;
-		/*
-		 * No printf() functions are signal-safe.
-		 * They deadlock easily. Write the format
-		 * string to get some output, even if
-		 * incomplete.
-		 */
-		ret = write(1, format, strlen(format));
-		if (ret < 0)
-			exit(1);
-	}
-}
-#define dprintf_level(level, args...) do {	\
-	if (level <= DEBUG_LEVEL)		\
-		sigsafe_printf(args);		\
-} while (0)
-#define dprintf0(args...) dprintf_level(0, args)
-#define dprintf1(args...) dprintf_level(1, args)
-#define dprintf2(args...) dprintf_level(2, args)
-#define dprintf3(args...) dprintf_level(3, args)
-#define dprintf4(args...) dprintf_level(4, args)
-
-extern unsigned int shadow_pkru;
-static inline unsigned int __rdpkru(void)
-{
-	unsigned int eax, edx;
-	unsigned int ecx = 0;
-	unsigned int pkru;
-
-	asm volatile(".byte 0x0f,0x01,0xee\n\t"
-		     : "=a" (eax), "=d" (edx)
-		     : "c" (ecx));
-	pkru = eax;
-	return pkru;
-}
-
-static inline unsigned int _rdpkru(int line)
-{
-	unsigned int pkru = __rdpkru();
-
-	dprintf4("rdpkru(line=%d) pkru: %x shadow: %x\n",
-			line, pkru, shadow_pkru);
-	assert(pkru == shadow_pkru);
-
-	return pkru;
-}
-
-#define rdpkru() _rdpkru(__LINE__)
-
-static inline void __wrpkru(unsigned int pkru)
-{
-	unsigned int eax = pkru;
-	unsigned int ecx = 0;
-	unsigned int edx = 0;
-
-	dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
-	asm volatile(".byte 0x0f,0x01,0xef\n\t"
-		     : : "a" (eax), "c" (ecx), "d" (edx));
-	assert(pkru == __rdpkru());
-}
-
-static inline void wrpkru(unsigned int pkru)
-{
-	dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
-	/* will do the shadow check for us: */
-	rdpkru();
-	__wrpkru(pkru);
-	shadow_pkru = pkru;
-	dprintf4("%s(%08x) pkru: %08x\n", __func__, pkru, __rdpkru());
-}
-
-/*
- * These are technically racy. since something could
- * change PKRU between the read and the write.
- */
-static inline void __pkey_access_allow(int pkey, int do_allow)
-{
-	unsigned int pkru = rdpkru();
-	int bit = pkey * 2;
-
-	if (do_allow)
-		pkru &= (1<<bit);
-	else
-		pkru |= (1<<bit);
-
-	dprintf4("pkru now: %08x\n", rdpkru());
-	wrpkru(pkru);
-}
-
-static inline void __pkey_write_allow(int pkey, int do_allow_write)
-{
-	long pkru = rdpkru();
-	int bit = pkey * 2 + 1;
-
-	if (do_allow_write)
-		pkru &= (1<<bit);
-	else
-		pkru |= (1<<bit);
-
-	wrpkru(pkru);
-	dprintf4("pkru now: %08x\n", rdpkru());
-}
-
-#define PROT_PKEY0     0x10            /* protection key value (bit 0) */
-#define PROT_PKEY1     0x20            /* protection key value (bit 1) */
-#define PROT_PKEY2     0x40            /* protection key value (bit 2) */
-#define PROT_PKEY3     0x80            /* protection key value (bit 3) */
-
-#define PAGE_SIZE 4096
-#define MB	(1<<20)
-
-static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
-		unsigned int *ecx, unsigned int *edx)
-{
-	/* ecx is often an input as well as an output. */
-	asm volatile(
-		"cpuid;"
-		: "=a" (*eax),
-		  "=b" (*ebx),
-		  "=c" (*ecx),
-		  "=d" (*edx)
-		: "0" (*eax), "2" (*ecx));
-}
-
-/* Intel-defined CPU features, CPUID level 0x00000007:0 (ecx) */
-#define X86_FEATURE_PKU        (1<<3) /* Protection Keys for Userspace */
-#define X86_FEATURE_OSPKE      (1<<4) /* OS Protection Keys Enable */
-
-static inline int cpu_has_pku(void)
-{
-	unsigned int eax;
-	unsigned int ebx;
-	unsigned int ecx;
-	unsigned int edx;
-
-	eax = 0x7;
-	ecx = 0x0;
-	__cpuid(&eax, &ebx, &ecx, &edx);
-
-	if (!(ecx & X86_FEATURE_PKU)) {
-		dprintf2("cpu does not have PKU\n");
-		return 0;
-	}
-	if (!(ecx & X86_FEATURE_OSPKE)) {
-		dprintf2("cpu does not have OSPKE\n");
-		return 0;
-	}
-	return 1;
-}
-
-#define XSTATE_PKRU_BIT	(9)
-#define XSTATE_PKRU	0x200
-
-int pkru_xstate_offset(void)
-{
-	unsigned int eax;
-	unsigned int ebx;
-	unsigned int ecx;
-	unsigned int edx;
-	int xstate_offset;
-	int xstate_size;
-	unsigned long XSTATE_CPUID = 0xd;
-	int leaf;
-
-	/* assume that XSTATE_PKRU is set in XCR0 */
-	leaf = XSTATE_PKRU_BIT;
-	{
-		eax = XSTATE_CPUID;
-		ecx = leaf;
-		__cpuid(&eax, &ebx, &ecx, &edx);
-
-		if (leaf == XSTATE_PKRU_BIT) {
-			xstate_offset = ebx;
-			xstate_size = eax;
-		}
-	}
-
-	if (xstate_size == 0) {
-		printf("could not find size/offset of PKRU in xsave state\n");
-		return 0;
-	}
-
-	return xstate_offset;
-}
-
-#endif /* _PKEYS_HELPER_H */
diff --git a/tools/testing/selftests/x86/protection_keys.c b/tools/testing/selftests/x86/protection_keys.c
deleted file mode 100644
index 460b4bd..0000000
--- a/tools/testing/selftests/x86/protection_keys.c
+++ /dev/null
@@ -1,1485 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Tests x86 Memory Protection Keys (see Documentation/x86/protection-keys.txt)
- *
- * There are examples in here of:
- *  * how to set protection keys on memory
- *  * how to set/clear bits in PKRU (the rights register)
- *  * how to handle SEGV_PKRU signals and extract pkey-relevant
- *    information from the siginfo
- *
- * Things to add:
- *	make sure KSM and KSM COW breaking works
- *	prefault pages in at malloc, or not
- *	protect MPX bounds tables with protection keys?
- *	make sure VMA splitting/merging is working correctly
- *	OOMs can destroy mm->mmap (see exit_mmap()), so make sure it is immune to pkeys
- *	look for pkey "leaks" where it is still set on a VMA but "freed" back to the kernel
- *	do a plain mprotect() to a mprotect_pkey() area and make sure the pkey sticks
- *
- * Compile like this:
- *	gcc      -o protection_keys    -O2 -g -std=gnu99 -pthread -Wall protection_keys.c -lrt -ldl -lm
- *	gcc -m32 -o protection_keys_32 -O2 -g -std=gnu99 -pthread -Wall protection_keys.c -lrt -ldl -lm
- */
-#define _GNU_SOURCE
-#include <errno.h>
-#include <linux/futex.h>
-#include <sys/time.h>
-#include <sys/syscall.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdint.h>
-#include <stdbool.h>
-#include <signal.h>
-#include <assert.h>
-#include <stdlib.h>
-#include <ucontext.h>
-#include <sys/mman.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <sys/ptrace.h>
-#include <setjmp.h>
-
-#include "pkey-helpers.h"
-
-int iteration_nr = 1;
-int test_nr;
-
-unsigned int shadow_pkru;
-
-#define HPAGE_SIZE	(1UL<<21)
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
-#define ALIGN_UP(x, align_to)	(((x) + ((align_to)-1)) & ~((align_to)-1))
-#define ALIGN_DOWN(x, align_to) ((x) & ~((align_to)-1))
-#define ALIGN_PTR_UP(p, ptr_align_to)	((typeof(p))ALIGN_UP((unsigned long)(p),	ptr_align_to))
-#define ALIGN_PTR_DOWN(p, ptr_align_to)	((typeof(p))ALIGN_DOWN((unsigned long)(p),	ptr_align_to))
-#define __stringify_1(x...)     #x
-#define __stringify(x...)       __stringify_1(x)
-
-#define PTR_ERR_ENOTSUP ((void *)-ENOTSUP)
-
-int dprint_in_signal;
-char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
-
-extern void abort_hooks(void);
-#define pkey_assert(condition) do {		\
-	if (!(condition)) {			\
-		dprintf0("assert() at %s::%d test_nr: %d iteration: %d\n", \
-				__FILE__, __LINE__,	\
-				test_nr, iteration_nr);	\
-		dprintf0("errno at assert: %d", errno);	\
-		abort_hooks();			\
-		exit(__LINE__);			\
-	}					\
-} while (0)
-
-void cat_into_file(char *str, char *file)
-{
-	int fd = open(file, O_RDWR);
-	int ret;
-
-	dprintf2("%s(): writing '%s' to '%s'\n", __func__, str, file);
-	/*
-	 * these need to be raw because they are called under
-	 * pkey_assert()
-	 */
-	if (fd < 0) {
-		fprintf(stderr, "error opening '%s'\n", str);
-		perror("error: ");
-		exit(__LINE__);
-	}
-
-	ret = write(fd, str, strlen(str));
-	if (ret != strlen(str)) {
-		perror("write to file failed");
-		fprintf(stderr, "filename: '%s' str: '%s'\n", file, str);
-		exit(__LINE__);
-	}
-	close(fd);
-}
-
-#if CONTROL_TRACING > 0
-static int warned_tracing;
-int tracing_root_ok(void)
-{
-	if (geteuid() != 0) {
-		if (!warned_tracing)
-			fprintf(stderr, "WARNING: not run as root, "
-					"can not do tracing control\n");
-		warned_tracing = 1;
-		return 0;
-	}
-	return 1;
-}
-#endif
-
-void tracing_on(void)
-{
-#if CONTROL_TRACING > 0
-#define TRACEDIR "/sys/kernel/debug/tracing"
-	char pidstr[32];
-
-	if (!tracing_root_ok())
-		return;
-
-	sprintf(pidstr, "%d", getpid());
-	cat_into_file("0", TRACEDIR "/tracing_on");
-	cat_into_file("\n", TRACEDIR "/trace");
-	if (1) {
-		cat_into_file("function_graph", TRACEDIR "/current_tracer");
-		cat_into_file("1", TRACEDIR "/options/funcgraph-proc");
-	} else {
-		cat_into_file("nop", TRACEDIR "/current_tracer");
-	}
-	cat_into_file(pidstr, TRACEDIR "/set_ftrace_pid");
-	cat_into_file("1", TRACEDIR "/tracing_on");
-	dprintf1("enabled tracing\n");
-#endif
-}
-
-void tracing_off(void)
-{
-#if CONTROL_TRACING > 0
-	if (!tracing_root_ok())
-		return;
-	cat_into_file("0", "/sys/kernel/debug/tracing/tracing_on");
-#endif
-}
-
-void abort_hooks(void)
-{
-	fprintf(stderr, "running %s()...\n", __func__);
-	tracing_off();
-#ifdef SLEEP_ON_ABORT
-	sleep(SLEEP_ON_ABORT);
-#endif
-}
-
-static inline void __page_o_noops(void)
-{
-	/* 8-bytes of instruction * 512 bytes = 1 page */
-	asm(".rept 512 ; nopl 0x7eeeeeee(%eax) ; .endr");
-}
-
-/*
- * This attempts to have roughly a page of instructions followed by a few
- * instructions that do a write, and another page of instructions.  That
- * way, we are pretty sure that the write is in the second page of
- * instructions and has at least a page of padding behind it.
- *
- * *That* lets us be sure to madvise() away the write instruction, which
- * will then fault, which makes sure that the fault code handles
- * execute-only memory properly.
- */
-__attribute__((__aligned__(PAGE_SIZE)))
-void lots_o_noops_around_write(int *write_to_me)
-{
-	dprintf3("running %s()\n", __func__);
-	__page_o_noops();
-	/* Assume this happens in the second page of instructions: */
-	*write_to_me = __LINE__;
-	/* pad out by another page: */
-	__page_o_noops();
-	dprintf3("%s() done\n", __func__);
-}
-
-/* Define some kernel-like types */
-#define  u8 uint8_t
-#define u16 uint16_t
-#define u32 uint32_t
-#define u64 uint64_t
-
-#ifdef __i386__
-
-#ifndef SYS_mprotect_key
-# define SYS_mprotect_key	380
-#endif
-
-#ifndef SYS_pkey_alloc
-# define SYS_pkey_alloc		381
-# define SYS_pkey_free		382
-#endif
-
-#define REG_IP_IDX		REG_EIP
-#define si_pkey_offset		0x14
-
-#else
-
-#ifndef SYS_mprotect_key
-# define SYS_mprotect_key	329
-#endif
-
-#ifndef SYS_pkey_alloc
-# define SYS_pkey_alloc		330
-# define SYS_pkey_free		331
-#endif
-
-#define REG_IP_IDX		REG_RIP
-#define si_pkey_offset		0x20
-
-#endif
-
-void dump_mem(void *dumpme, int len_bytes)
-{
-	char *c = (void *)dumpme;
-	int i;
-
-	for (i = 0; i < len_bytes; i += sizeof(u64)) {
-		u64 *ptr = (u64 *)(c + i);
-		dprintf1("dump[%03d][@%p]: %016jx\n", i, ptr, *ptr);
-	}
-}
-
-/* Failed address bound checks: */
-#ifndef SEGV_BNDERR
-# define SEGV_BNDERR		3
-#endif
-
-#ifndef SEGV_PKUERR
-# define SEGV_PKUERR		4
-#endif
-
-static char *si_code_str(int si_code)
-{
-	if (si_code == SEGV_MAPERR)
-		return "SEGV_MAPERR";
-	if (si_code == SEGV_ACCERR)
-		return "SEGV_ACCERR";
-	if (si_code == SEGV_BNDERR)
-		return "SEGV_BNDERR";
-	if (si_code == SEGV_PKUERR)
-		return "SEGV_PKUERR";
-	return "UNKNOWN";
-}
-
-int pkru_faults;
-int last_si_pkey = -1;
-void signal_handler(int signum, siginfo_t *si, void *vucontext)
-{
-	ucontext_t *uctxt = vucontext;
-	int trapno;
-	unsigned long ip;
-	char *fpregs;
-	u32 *pkru_ptr;
-	u64 siginfo_pkey;
-	u32 *si_pkey_ptr;
-	int pkru_offset;
-	fpregset_t fpregset;
-
-	dprint_in_signal = 1;
-	dprintf1(">>>>===============SIGSEGV============================\n");
-	dprintf1("%s()::%d, pkru: 0x%x shadow: %x\n", __func__, __LINE__,
-			__rdpkru(), shadow_pkru);
-
-	trapno = uctxt->uc_mcontext.gregs[REG_TRAPNO];
-	ip = uctxt->uc_mcontext.gregs[REG_IP_IDX];
-	fpregset = uctxt->uc_mcontext.fpregs;
-	fpregs = (void *)fpregset;
-
-	dprintf2("%s() trapno: %d ip: 0x%lx info->si_code: %s/%d\n", __func__,
-			trapno, ip, si_code_str(si->si_code), si->si_code);
-#ifdef __i386__
-	/*
-	 * 32-bit has some extra padding so that userspace can tell whether
-	 * the XSTATE header is present in addition to the "legacy" FPU
-	 * state.  We just assume that it is here.
-	 */
-	fpregs += 0x70;
-#endif
-	pkru_offset = pkru_xstate_offset();
-	pkru_ptr = (void *)(&fpregs[pkru_offset]);
-
-	dprintf1("siginfo: %p\n", si);
-	dprintf1(" fpregs: %p\n", fpregs);
-	/*
-	 * If we got a PKRU fault, we *HAVE* to have at least one bit set in
-	 * here.
-	 */
-	dprintf1("pkru_xstate_offset: %d\n", pkru_xstate_offset());
-	if (DEBUG_LEVEL > 4)
-		dump_mem(pkru_ptr - 128, 256);
-	pkey_assert(*pkru_ptr);
-
-	if ((si->si_code == SEGV_MAPERR) ||
-	    (si->si_code == SEGV_ACCERR) ||
-	    (si->si_code == SEGV_BNDERR)) {
-		printf("non-PK si_code, exiting...\n");
-		exit(4);
-	}
-
-	si_pkey_ptr = (u32 *)(((u8 *)si) + si_pkey_offset);
-	dprintf1("si_pkey_ptr: %p\n", si_pkey_ptr);
-	dump_mem((u8 *)si_pkey_ptr - 8, 24);
-	siginfo_pkey = *si_pkey_ptr;
-	pkey_assert(siginfo_pkey < NR_PKEYS);
-	last_si_pkey = siginfo_pkey;
-
-	dprintf1("signal pkru from xsave: %08x\n", *pkru_ptr);
-	/* need __rdpkru() version so we do not do shadow_pkru checking */
-	dprintf1("signal pkru from  pkru: %08x\n", __rdpkru());
-	dprintf1("pkey from siginfo: %jx\n", siginfo_pkey);
-	*(u64 *)pkru_ptr = 0x00000000;
-	dprintf1("WARNING: set PRKU=0 to allow faulting instruction to continue\n");
-	pkru_faults++;
-	dprintf1("<<<<==================================================\n");
-	dprint_in_signal = 0;
-}
-
-int wait_all_children(void)
-{
-	int status;
-	return waitpid(-1, &status, 0);
-}
-
-void sig_chld(int x)
-{
-	dprint_in_signal = 1;
-	dprintf2("[%d] SIGCHLD: %d\n", getpid(), x);
-	dprint_in_signal = 0;
-}
-
-void setup_sigsegv_handler(void)
-{
-	int r, rs;
-	struct sigaction newact;
-	struct sigaction oldact;
-
-	/* #PF is mapped to sigsegv */
-	int signum  = SIGSEGV;
-
-	newact.sa_handler = 0;
-	newact.sa_sigaction = signal_handler;
-
-	/*sigset_t - signals to block while in the handler */
-	/* get the old signal mask. */
-	rs = sigprocmask(SIG_SETMASK, 0, &newact.sa_mask);
-	pkey_assert(rs == 0);
-
-	/* call sa_sigaction, not sa_handler*/
-	newact.sa_flags = SA_SIGINFO;
-
-	newact.sa_restorer = 0;  /* void(*)(), obsolete */
-	r = sigaction(signum, &newact, &oldact);
-	r = sigaction(SIGALRM, &newact, &oldact);
-	pkey_assert(r == 0);
-}
-
-void setup_handlers(void)
-{
-	signal(SIGCHLD, &sig_chld);
-	setup_sigsegv_handler();
-}
-
-pid_t fork_lazy_child(void)
-{
-	pid_t forkret;
-
-	forkret = fork();
-	pkey_assert(forkret >= 0);
-	dprintf3("[%d] fork() ret: %d\n", getpid(), forkret);
-
-	if (!forkret) {
-		/* in the child */
-		while (1) {
-			dprintf1("child sleeping...\n");
-			sleep(30);
-		}
-	}
-	return forkret;
-}
-
-#ifndef PKEY_DISABLE_ACCESS
-# define PKEY_DISABLE_ACCESS	0x1
-#endif
-
-#ifndef PKEY_DISABLE_WRITE
-# define PKEY_DISABLE_WRITE	0x2
-#endif
-
-static u32 hw_pkey_get(int pkey, unsigned long flags)
-{
-	u32 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
-	u32 pkru = __rdpkru();
-	u32 shifted_pkru;
-	u32 masked_pkru;
-
-	dprintf1("%s(pkey=%d, flags=%lx) = %x / %d\n",
-			__func__, pkey, flags, 0, 0);
-	dprintf2("%s() raw pkru: %x\n", __func__, pkru);
-
-	shifted_pkru = (pkru >> (pkey * PKRU_BITS_PER_PKEY));
-	dprintf2("%s() shifted_pkru: %x\n", __func__, shifted_pkru);
-	masked_pkru = shifted_pkru & mask;
-	dprintf2("%s() masked  pkru: %x\n", __func__, masked_pkru);
-	/*
-	 * shift down the relevant bits to the lowest two, then
-	 * mask off all the other high bits.
-	 */
-	return masked_pkru;
-}
-
-static int hw_pkey_set(int pkey, unsigned long rights, unsigned long flags)
-{
-	u32 mask = (PKEY_DISABLE_ACCESS|PKEY_DISABLE_WRITE);
-	u32 old_pkru = __rdpkru();
-	u32 new_pkru;
-
-	/* make sure that 'rights' only contains the bits we expect: */
-	assert(!(rights & ~mask));
-
-	/* copy old pkru */
-	new_pkru = old_pkru;
-	/* mask out bits from pkey in old value: */
-	new_pkru &= ~(mask << (pkey * PKRU_BITS_PER_PKEY));
-	/* OR in new bits for pkey: */
-	new_pkru |= (rights << (pkey * PKRU_BITS_PER_PKEY));
-
-	__wrpkru(new_pkru);
-
-	dprintf3("%s(pkey=%d, rights=%lx, flags=%lx) = %x pkru now: %x old_pkru: %x\n",
-			__func__, pkey, rights, flags, 0, __rdpkru(), old_pkru);
-	return 0;
-}
-
-void pkey_disable_set(int pkey, int flags)
-{
-	unsigned long syscall_flags = 0;
-	int ret;
-	int pkey_rights;
-	u32 orig_pkru = rdpkru();
-
-	dprintf1("START->%s(%d, 0x%x)\n", __func__,
-		pkey, flags);
-	pkey_assert(flags & (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE));
-
-	pkey_rights = hw_pkey_get(pkey, syscall_flags);
-
-	dprintf1("%s(%d) hw_pkey_get(%d): %x\n", __func__,
-			pkey, pkey, pkey_rights);
-	pkey_assert(pkey_rights >= 0);
-
-	pkey_rights |= flags;
-
-	ret = hw_pkey_set(pkey, pkey_rights, syscall_flags);
-	assert(!ret);
-	/*pkru and flags have the same format */
-	shadow_pkru |= flags << (pkey * 2);
-	dprintf1("%s(%d) shadow: 0x%x\n", __func__, pkey, shadow_pkru);
-
-	pkey_assert(ret >= 0);
-
-	pkey_rights = hw_pkey_get(pkey, syscall_flags);
-	dprintf1("%s(%d) hw_pkey_get(%d): %x\n", __func__,
-			pkey, pkey, pkey_rights);
-
-	dprintf1("%s(%d) pkru: 0x%x\n", __func__, pkey, rdpkru());
-	if (flags)
-		pkey_assert(rdpkru() > orig_pkru);
-	dprintf1("END<---%s(%d, 0x%x)\n", __func__,
-		pkey, flags);
-}
-
-void pkey_disable_clear(int pkey, int flags)
-{
-	unsigned long syscall_flags = 0;
-	int ret;
-	int pkey_rights = hw_pkey_get(pkey, syscall_flags);
-	u32 orig_pkru = rdpkru();
-
-	pkey_assert(flags & (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE));
-
-	dprintf1("%s(%d) hw_pkey_get(%d): %x\n", __func__,
-			pkey, pkey, pkey_rights);
-	pkey_assert(pkey_rights >= 0);
-
-	pkey_rights |= flags;
-
-	ret = hw_pkey_set(pkey, pkey_rights, 0);
-	/* pkru and flags have the same format */
-	shadow_pkru &= ~(flags << (pkey * 2));
-	pkey_assert(ret >= 0);
-
-	pkey_rights = hw_pkey_get(pkey, syscall_flags);
-	dprintf1("%s(%d) hw_pkey_get(%d): %x\n", __func__,
-			pkey, pkey, pkey_rights);
-
-	dprintf1("%s(%d) pkru: 0x%x\n", __func__, pkey, rdpkru());
-	if (flags)
-		assert(rdpkru() > orig_pkru);
-}
-
-void pkey_write_allow(int pkey)
-{
-	pkey_disable_clear(pkey, PKEY_DISABLE_WRITE);
-}
-void pkey_write_deny(int pkey)
-{
-	pkey_disable_set(pkey, PKEY_DISABLE_WRITE);
-}
-void pkey_access_allow(int pkey)
-{
-	pkey_disable_clear(pkey, PKEY_DISABLE_ACCESS);
-}
-void pkey_access_deny(int pkey)
-{
-	pkey_disable_set(pkey, PKEY_DISABLE_ACCESS);
-}
-
-int sys_mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
-		unsigned long pkey)
-{
-	int sret;
-
-	dprintf2("%s(0x%p, %zx, prot=%lx, pkey=%lx)\n", __func__,
-			ptr, size, orig_prot, pkey);
-
-	errno = 0;
-	sret = syscall(SYS_mprotect_key, ptr, size, orig_prot, pkey);
-	if (errno) {
-		dprintf2("SYS_mprotect_key sret: %d\n", sret);
-		dprintf2("SYS_mprotect_key prot: 0x%lx\n", orig_prot);
-		dprintf2("SYS_mprotect_key failed, errno: %d\n", errno);
-		if (DEBUG_LEVEL >= 2)
-			perror("SYS_mprotect_pkey");
-	}
-	return sret;
-}
-
-int sys_pkey_alloc(unsigned long flags, unsigned long init_val)
-{
-	int ret = syscall(SYS_pkey_alloc, flags, init_val);
-	dprintf1("%s(flags=%lx, init_val=%lx) syscall ret: %d errno: %d\n",
-			__func__, flags, init_val, ret, errno);
-	return ret;
-}
-
-int alloc_pkey(void)
-{
-	int ret;
-	unsigned long init_val = 0x0;
-
-	dprintf1("alloc_pkey()::%d, pkru: 0x%x shadow: %x\n",
-			__LINE__, __rdpkru(), shadow_pkru);
-	ret = sys_pkey_alloc(0, init_val);
-	/*
-	 * pkey_alloc() sets PKRU, so we need to reflect it in
-	 * shadow_pkru:
-	 */
-	dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
-			__LINE__, ret, __rdpkru(), shadow_pkru);
-	if (ret) {
-		/* clear both the bits: */
-		shadow_pkru &= ~(0x3      << (ret * 2));
-		dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
-				__LINE__, ret, __rdpkru(), shadow_pkru);
-		/*
-		 * move the new state in from init_val
-		 * (remember, we cheated and init_val == pkru format)
-		 */
-		shadow_pkru |=  (init_val << (ret * 2));
-	}
-	dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
-			__LINE__, ret, __rdpkru(), shadow_pkru);
-	dprintf1("alloc_pkey()::%d errno: %d\n", __LINE__, errno);
-	/* for shadow checking: */
-	rdpkru();
-	dprintf4("alloc_pkey()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n",
-			__LINE__, ret, __rdpkru(), shadow_pkru);
-	return ret;
-}
-
-int sys_pkey_free(unsigned long pkey)
-{
-	int ret = syscall(SYS_pkey_free, pkey);
-	dprintf1("%s(pkey=%ld) syscall ret: %d\n", __func__, pkey, ret);
-	return ret;
-}
-
-/*
- * I had a bug where pkey bits could be set by mprotect() but
- * not cleared.  This ensures we get lots of random bit sets
- * and clears on the vma and pte pkey bits.
- */
-int alloc_random_pkey(void)
-{
-	int max_nr_pkey_allocs;
-	int ret;
-	int i;
-	int alloced_pkeys[NR_PKEYS];
-	int nr_alloced = 0;
-	int random_index;
-	memset(alloced_pkeys, 0, sizeof(alloced_pkeys));
-
-	/* allocate every possible key and make a note of which ones we got */
-	max_nr_pkey_allocs = NR_PKEYS;
-	max_nr_pkey_allocs = 1;
-	for (i = 0; i < max_nr_pkey_allocs; i++) {
-		int new_pkey = alloc_pkey();
-		if (new_pkey < 0)
-			break;
-		alloced_pkeys[nr_alloced++] = new_pkey;
-	}
-
-	pkey_assert(nr_alloced > 0);
-	/* select a random one out of the allocated ones */
-	random_index = rand() % nr_alloced;
-	ret = alloced_pkeys[random_index];
-	/* now zero it out so we don't free it next */
-	alloced_pkeys[random_index] = 0;
-
-	/* go through the allocated ones that we did not want and free them */
-	for (i = 0; i < nr_alloced; i++) {
-		int free_ret;
-		if (!alloced_pkeys[i])
-			continue;
-		free_ret = sys_pkey_free(alloced_pkeys[i]);
-		pkey_assert(!free_ret);
-	}
-	dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
-			__LINE__, ret, __rdpkru(), shadow_pkru);
-	return ret;
-}
-
-int mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
-		unsigned long pkey)
-{
-	int nr_iterations = random() % 100;
-	int ret;
-
-	while (0) {
-		int rpkey = alloc_random_pkey();
-		ret = sys_mprotect_pkey(ptr, size, orig_prot, pkey);
-		dprintf1("sys_mprotect_pkey(%p, %zx, prot=0x%lx, pkey=%ld) ret: %d\n",
-				ptr, size, orig_prot, pkey, ret);
-		if (nr_iterations-- < 0)
-			break;
-
-		dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
-			__LINE__, ret, __rdpkru(), shadow_pkru);
-		sys_pkey_free(rpkey);
-		dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
-			__LINE__, ret, __rdpkru(), shadow_pkru);
-	}
-	pkey_assert(pkey < NR_PKEYS);
-
-	ret = sys_mprotect_pkey(ptr, size, orig_prot, pkey);
-	dprintf1("mprotect_pkey(%p, %zx, prot=0x%lx, pkey=%ld) ret: %d\n",
-			ptr, size, orig_prot, pkey, ret);
-	pkey_assert(!ret);
-	dprintf1("%s()::%d, ret: %d pkru: 0x%x shadow: 0x%x\n", __func__,
-			__LINE__, ret, __rdpkru(), shadow_pkru);
-	return ret;
-}
-
-struct pkey_malloc_record {
-	void *ptr;
-	long size;
-	int prot;
-};
-struct pkey_malloc_record *pkey_malloc_records;
-struct pkey_malloc_record *pkey_last_malloc_record;
-long nr_pkey_malloc_records;
-void record_pkey_malloc(void *ptr, long size, int prot)
-{
-	long i;
-	struct pkey_malloc_record *rec = NULL;
-
-	for (i = 0; i < nr_pkey_malloc_records; i++) {
-		rec = &pkey_malloc_records[i];
-		/* find a free record */
-		if (rec)
-			break;
-	}
-	if (!rec) {
-		/* every record is full */
-		size_t old_nr_records = nr_pkey_malloc_records;
-		size_t new_nr_records = (nr_pkey_malloc_records * 2 + 1);
-		size_t new_size = new_nr_records * sizeof(struct pkey_malloc_record);
-		dprintf2("new_nr_records: %zd\n", new_nr_records);
-		dprintf2("new_size: %zd\n", new_size);
-		pkey_malloc_records = realloc(pkey_malloc_records, new_size);
-		pkey_assert(pkey_malloc_records != NULL);
-		rec = &pkey_malloc_records[nr_pkey_malloc_records];
-		/*
-		 * realloc() does not initialize memory, so zero it from
-		 * the first new record all the way to the end.
-		 */
-		for (i = 0; i < new_nr_records - old_nr_records; i++)
-			memset(rec + i, 0, sizeof(*rec));
-	}
-	dprintf3("filling malloc record[%d/%p]: {%p, %ld}\n",
-		(int)(rec - pkey_malloc_records), rec, ptr, size);
-	rec->ptr = ptr;
-	rec->size = size;
-	rec->prot = prot;
-	pkey_last_malloc_record = rec;
-	nr_pkey_malloc_records++;
-}
-
-void free_pkey_malloc(void *ptr)
-{
-	long i;
-	int ret;
-	dprintf3("%s(%p)\n", __func__, ptr);
-	for (i = 0; i < nr_pkey_malloc_records; i++) {
-		struct pkey_malloc_record *rec = &pkey_malloc_records[i];
-		dprintf4("looking for ptr %p at record[%ld/%p]: {%p, %ld}\n",
-				ptr, i, rec, rec->ptr, rec->size);
-		if ((ptr <  rec->ptr) ||
-		    (ptr >= rec->ptr + rec->size))
-			continue;
-
-		dprintf3("found ptr %p at record[%ld/%p]: {%p, %ld}\n",
-				ptr, i, rec, rec->ptr, rec->size);
-		nr_pkey_malloc_records--;
-		ret = munmap(rec->ptr, rec->size);
-		dprintf3("munmap ret: %d\n", ret);
-		pkey_assert(!ret);
-		dprintf3("clearing rec->ptr, rec: %p\n", rec);
-		rec->ptr = NULL;
-		dprintf3("done clearing rec->ptr, rec: %p\n", rec);
-		return;
-	}
-	pkey_assert(false);
-}
-
-
-void *malloc_pkey_with_mprotect(long size, int prot, u16 pkey)
-{
-	void *ptr;
-	int ret;
-
-	rdpkru();
-	dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
-			size, prot, pkey);
-	pkey_assert(pkey < NR_PKEYS);
-	ptr = mmap(NULL, size, prot, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
-	pkey_assert(ptr != (void *)-1);
-	ret = mprotect_pkey((void *)ptr, PAGE_SIZE, prot, pkey);
-	pkey_assert(!ret);
-	record_pkey_malloc(ptr, size, prot);
-	rdpkru();
-
-	dprintf1("%s() for pkey %d @ %p\n", __func__, pkey, ptr);
-	return ptr;
-}
-
-void *malloc_pkey_anon_huge(long size, int prot, u16 pkey)
-{
-	int ret;
-	void *ptr;
-
-	dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
-			size, prot, pkey);
-	/*
-	 * Guarantee we can fit at least one huge page in the resulting
-	 * allocation by allocating space for 2:
-	 */
-	size = ALIGN_UP(size, HPAGE_SIZE * 2);
-	ptr = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
-	pkey_assert(ptr != (void *)-1);
-	record_pkey_malloc(ptr, size, prot);
-	mprotect_pkey(ptr, size, prot, pkey);
-
-	dprintf1("unaligned ptr: %p\n", ptr);
-	ptr = ALIGN_PTR_UP(ptr, HPAGE_SIZE);
-	dprintf1("  aligned ptr: %p\n", ptr);
-	ret = madvise(ptr, HPAGE_SIZE, MADV_HUGEPAGE);
-	dprintf1("MADV_HUGEPAGE ret: %d\n", ret);
-	ret = madvise(ptr, HPAGE_SIZE, MADV_WILLNEED);
-	dprintf1("MADV_WILLNEED ret: %d\n", ret);
-	memset(ptr, 0, HPAGE_SIZE);
-
-	dprintf1("mmap()'d thp for pkey %d @ %p\n", pkey, ptr);
-	return ptr;
-}
-
-int hugetlb_setup_ok;
-#define GET_NR_HUGE_PAGES 10
-void setup_hugetlbfs(void)
-{
-	int err;
-	int fd;
-	char buf[] = "123";
-
-	if (geteuid() != 0) {
-		fprintf(stderr, "WARNING: not run as root, can not do hugetlb test\n");
-		return;
-	}
-
-	cat_into_file(__stringify(GET_NR_HUGE_PAGES), "/proc/sys/vm/nr_hugepages");
-
-	/*
-	 * Now go make sure that we got the pages and that they
-	 * are 2M pages.  Someone might have made 1G the default.
-	 */
-	fd = open("/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages", O_RDONLY);
-	if (fd < 0) {
-		perror("opening sysfs 2M hugetlb config");
-		return;
-	}
-
-	/* -1 to guarantee leaving the trailing \0 */
-	err = read(fd, buf, sizeof(buf)-1);
-	close(fd);
-	if (err <= 0) {
-		perror("reading sysfs 2M hugetlb config");
-		return;
-	}
-
-	if (atoi(buf) != GET_NR_HUGE_PAGES) {
-		fprintf(stderr, "could not confirm 2M pages, got: '%s' expected %d\n",
-			buf, GET_NR_HUGE_PAGES);
-		return;
-	}
-
-	hugetlb_setup_ok = 1;
-}
-
-void *malloc_pkey_hugetlb(long size, int prot, u16 pkey)
-{
-	void *ptr;
-	int flags = MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB;
-
-	if (!hugetlb_setup_ok)
-		return PTR_ERR_ENOTSUP;
-
-	dprintf1("doing %s(%ld, %x, %x)\n", __func__, size, prot, pkey);
-	size = ALIGN_UP(size, HPAGE_SIZE * 2);
-	pkey_assert(pkey < NR_PKEYS);
-	ptr = mmap(NULL, size, PROT_NONE, flags, -1, 0);
-	pkey_assert(ptr != (void *)-1);
-	mprotect_pkey(ptr, size, prot, pkey);
-
-	record_pkey_malloc(ptr, size, prot);
-
-	dprintf1("mmap()'d hugetlbfs for pkey %d @ %p\n", pkey, ptr);
-	return ptr;
-}
-
-void *malloc_pkey_mmap_dax(long size, int prot, u16 pkey)
-{
-	void *ptr;
-	int fd;
-
-	dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
-			size, prot, pkey);
-	pkey_assert(pkey < NR_PKEYS);
-	fd = open("/dax/foo", O_RDWR);
-	pkey_assert(fd >= 0);
-
-	ptr = mmap(0, size, prot, MAP_SHARED, fd, 0);
-	pkey_assert(ptr != (void *)-1);
-
-	mprotect_pkey(ptr, size, prot, pkey);
-
-	record_pkey_malloc(ptr, size, prot);
-
-	dprintf1("mmap()'d for pkey %d @ %p\n", pkey, ptr);
-	close(fd);
-	return ptr;
-}
-
-void *(*pkey_malloc[])(long size, int prot, u16 pkey) = {
-
-	malloc_pkey_with_mprotect,
-	malloc_pkey_anon_huge,
-	malloc_pkey_hugetlb
-/* can not do direct with the pkey_mprotect() API:
-	malloc_pkey_mmap_direct,
-	malloc_pkey_mmap_dax,
-*/
-};
-
-void *malloc_pkey(long size, int prot, u16 pkey)
-{
-	void *ret;
-	static int malloc_type;
-	int nr_malloc_types = ARRAY_SIZE(pkey_malloc);
-
-	pkey_assert(pkey < NR_PKEYS);
-
-	while (1) {
-		pkey_assert(malloc_type < nr_malloc_types);
-
-		ret = pkey_malloc[malloc_type](size, prot, pkey);
-		pkey_assert(ret != (void *)-1);
-
-		malloc_type++;
-		if (malloc_type >= nr_malloc_types)
-			malloc_type = (random()%nr_malloc_types);
-
-		/* try again if the malloc_type we tried is unsupported */
-		if (ret == PTR_ERR_ENOTSUP)
-			continue;
-
-		break;
-	}
-
-	dprintf3("%s(%ld, prot=%x, pkey=%x) returning: %p\n", __func__,
-			size, prot, pkey, ret);
-	return ret;
-}
-
-int last_pkru_faults;
-#define UNKNOWN_PKEY -2
-void expected_pk_fault(int pkey)
-{
-	dprintf2("%s(): last_pkru_faults: %d pkru_faults: %d\n",
-			__func__, last_pkru_faults, pkru_faults);
-	dprintf2("%s(%d): last_si_pkey: %d\n", __func__, pkey, last_si_pkey);
-	pkey_assert(last_pkru_faults + 1 == pkru_faults);
-
-       /*
-	* For exec-only memory, we do not know the pkey in
-	* advance, so skip this check.
-	*/
-	if (pkey != UNKNOWN_PKEY)
-		pkey_assert(last_si_pkey == pkey);
-
-	/*
-	 * The signal handler shold have cleared out PKRU to let the
-	 * test program continue.  We now have to restore it.
-	 */
-	if (__rdpkru() != 0)
-		pkey_assert(0);
-
-	__wrpkru(shadow_pkru);
-	dprintf1("%s() set PKRU=%x to restore state after signal nuked it\n",
-			__func__, shadow_pkru);
-	last_pkru_faults = pkru_faults;
-	last_si_pkey = -1;
-}
-
-#define do_not_expect_pk_fault(msg)	do {			\
-	if (last_pkru_faults != pkru_faults)			\
-		dprintf0("unexpected PK fault: %s\n", msg);	\
-	pkey_assert(last_pkru_faults == pkru_faults);		\
-} while (0)
-
-int test_fds[10] = { -1 };
-int nr_test_fds;
-void __save_test_fd(int fd)
-{
-	pkey_assert(fd >= 0);
-	pkey_assert(nr_test_fds < ARRAY_SIZE(test_fds));
-	test_fds[nr_test_fds] = fd;
-	nr_test_fds++;
-}
-
-int get_test_read_fd(void)
-{
-	int test_fd = open("/etc/passwd", O_RDONLY);
-	__save_test_fd(test_fd);
-	return test_fd;
-}
-
-void close_test_fds(void)
-{
-	int i;
-
-	for (i = 0; i < nr_test_fds; i++) {
-		if (test_fds[i] < 0)
-			continue;
-		close(test_fds[i]);
-		test_fds[i] = -1;
-	}
-	nr_test_fds = 0;
-}
-
-#define barrier() __asm__ __volatile__("": : :"memory")
-__attribute__((noinline)) int read_ptr(int *ptr)
-{
-	/*
-	 * Keep GCC from optimizing this away somehow
-	 */
-	barrier();
-	return *ptr;
-}
-
-void test_read_of_write_disabled_region(int *ptr, u16 pkey)
-{
-	int ptr_contents;
-
-	dprintf1("disabling write access to PKEY[1], doing read\n");
-	pkey_write_deny(pkey);
-	ptr_contents = read_ptr(ptr);
-	dprintf1("*ptr: %d\n", ptr_contents);
-	dprintf1("\n");
-}
-void test_read_of_access_disabled_region(int *ptr, u16 pkey)
-{
-	int ptr_contents;
-
-	dprintf1("disabling access to PKEY[%02d], doing read @ %p\n", pkey, ptr);
-	rdpkru();
-	pkey_access_deny(pkey);
-	ptr_contents = read_ptr(ptr);
-	dprintf1("*ptr: %d\n", ptr_contents);
-	expected_pk_fault(pkey);
-}
-void test_write_of_write_disabled_region(int *ptr, u16 pkey)
-{
-	dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);
-	pkey_write_deny(pkey);
-	*ptr = __LINE__;
-	expected_pk_fault(pkey);
-}
-void test_write_of_access_disabled_region(int *ptr, u16 pkey)
-{
-	dprintf1("disabling access to PKEY[%02d], doing write\n", pkey);
-	pkey_access_deny(pkey);
-	*ptr = __LINE__;
-	expected_pk_fault(pkey);
-}
-void test_kernel_write_of_access_disabled_region(int *ptr, u16 pkey)
-{
-	int ret;
-	int test_fd = get_test_read_fd();
-
-	dprintf1("disabling access to PKEY[%02d], "
-		 "having kernel read() to buffer\n", pkey);
-	pkey_access_deny(pkey);
-	ret = read(test_fd, ptr, 1);
-	dprintf1("read ret: %d\n", ret);
-	pkey_assert(ret);
-}
-void test_kernel_write_of_write_disabled_region(int *ptr, u16 pkey)
-{
-	int ret;
-	int test_fd = get_test_read_fd();
-
-	pkey_write_deny(pkey);
-	ret = read(test_fd, ptr, 100);
-	dprintf1("read ret: %d\n", ret);
-	if (ret < 0 && (DEBUG_LEVEL > 0))
-		perror("verbose read result (OK for this to be bad)");
-	pkey_assert(ret);
-}
-
-void test_kernel_gup_of_access_disabled_region(int *ptr, u16 pkey)
-{
-	int pipe_ret, vmsplice_ret;
-	struct iovec iov;
-	int pipe_fds[2];
-
-	pipe_ret = pipe(pipe_fds);
-
-	pkey_assert(pipe_ret == 0);
-	dprintf1("disabling access to PKEY[%02d], "
-		 "having kernel vmsplice from buffer\n", pkey);
-	pkey_access_deny(pkey);
-	iov.iov_base = ptr;
-	iov.iov_len = PAGE_SIZE;
-	vmsplice_ret = vmsplice(pipe_fds[1], &iov, 1, SPLICE_F_GIFT);
-	dprintf1("vmsplice() ret: %d\n", vmsplice_ret);
-	pkey_assert(vmsplice_ret == -1);
-
-	close(pipe_fds[0]);
-	close(pipe_fds[1]);
-}
-
-void test_kernel_gup_write_to_write_disabled_region(int *ptr, u16 pkey)
-{
-	int ignored = 0xdada;
-	int futex_ret;
-	int some_int = __LINE__;
-
-	dprintf1("disabling write to PKEY[%02d], "
-		 "doing futex gunk in buffer\n", pkey);
-	*ptr = some_int;
-	pkey_write_deny(pkey);
-	futex_ret = syscall(SYS_futex, ptr, FUTEX_WAIT, some_int-1, NULL,
-			&ignored, ignored);
-	if (DEBUG_LEVEL > 0)
-		perror("futex");
-	dprintf1("futex() ret: %d\n", futex_ret);
-}
-
-/* Assumes that all pkeys other than 'pkey' are unallocated */
-void test_pkey_syscalls_on_non_allocated_pkey(int *ptr, u16 pkey)
-{
-	int err;
-	int i;
-
-	/* Note: 0 is the default pkey, so don't mess with it */
-	for (i = 1; i < NR_PKEYS; i++) {
-		if (pkey == i)
-			continue;
-
-		dprintf1("trying get/set/free to non-allocated pkey: %2d\n", i);
-		err = sys_pkey_free(i);
-		pkey_assert(err);
-
-		err = sys_pkey_free(i);
-		pkey_assert(err);
-
-		err = sys_mprotect_pkey(ptr, PAGE_SIZE, PROT_READ, i);
-		pkey_assert(err);
-	}
-}
-
-/* Assumes that all pkeys other than 'pkey' are unallocated */
-void test_pkey_syscalls_bad_args(int *ptr, u16 pkey)
-{
-	int err;
-	int bad_pkey = NR_PKEYS+99;
-
-	/* pass a known-invalid pkey in: */
-	err = sys_mprotect_pkey(ptr, PAGE_SIZE, PROT_READ, bad_pkey);
-	pkey_assert(err);
-}
-
-/* Assumes that all pkeys other than 'pkey' are unallocated */
-void test_pkey_alloc_exhaust(int *ptr, u16 pkey)
-{
-	int err;
-	int allocated_pkeys[NR_PKEYS] = {0};
-	int nr_allocated_pkeys = 0;
-	int i;
-
-	for (i = 0; i < NR_PKEYS*2; i++) {
-		int new_pkey;
-		dprintf1("%s() alloc loop: %d\n", __func__, i);
-		new_pkey = alloc_pkey();
-		dprintf4("%s()::%d, err: %d pkru: 0x%x shadow: 0x%x\n", __func__,
-				__LINE__, err, __rdpkru(), shadow_pkru);
-		rdpkru(); /* for shadow checking */
-		dprintf2("%s() errno: %d ENOSPC: %d\n", __func__, errno, ENOSPC);
-		if ((new_pkey == -1) && (errno == ENOSPC)) {
-			dprintf2("%s() failed to allocate pkey after %d tries\n",
-				__func__, nr_allocated_pkeys);
-			break;
-		}
-		pkey_assert(nr_allocated_pkeys < NR_PKEYS);
-		allocated_pkeys[nr_allocated_pkeys++] = new_pkey;
-	}
-
-	dprintf3("%s()::%d\n", __func__, __LINE__);
-
-	/*
-	 * ensure it did not reach the end of the loop without
-	 * failure:
-	 */
-	pkey_assert(i < NR_PKEYS*2);
-
-	/*
-	 * There are 16 pkeys supported in hardware.  Three are
-	 * allocated by the time we get here:
-	 *   1. The default key (0)
-	 *   2. One possibly consumed by an execute-only mapping.
-	 *   3. One allocated by the test code and passed in via
-	 *      'pkey' to this function.
-	 * Ensure that we can allocate at least another 13 (16-3).
-	 */
-	pkey_assert(i >= NR_PKEYS-3);
-
-	for (i = 0; i < nr_allocated_pkeys; i++) {
-		err = sys_pkey_free(allocated_pkeys[i]);
-		pkey_assert(!err);
-		rdpkru(); /* for shadow checking */
-	}
-}
-
-/*
- * pkey 0 is special.  It is allocated by default, so you do not
- * have to call pkey_alloc() to use it first.  Make sure that it
- * is usable.
- */
-void test_mprotect_with_pkey_0(int *ptr, u16 pkey)
-{
-	long size;
-	int prot;
-
-	assert(pkey_last_malloc_record);
-	size = pkey_last_malloc_record->size;
-	/*
-	 * This is a bit of a hack.  But mprotect() requires
-	 * huge-page-aligned sizes when operating on hugetlbfs.
-	 * So, make sure that we use something that's a multiple
-	 * of a huge page when we can.
-	 */
-	if (size >= HPAGE_SIZE)
-		size = HPAGE_SIZE;
-	prot = pkey_last_malloc_record->prot;
-
-	/* Use pkey 0 */
-	mprotect_pkey(ptr, size, prot, 0);
-
-	/* Make sure that we can set it back to the original pkey. */
-	mprotect_pkey(ptr, size, prot, pkey);
-}
-
-void test_ptrace_of_child(int *ptr, u16 pkey)
-{
-	__attribute__((__unused__)) int peek_result;
-	pid_t child_pid;
-	void *ignored = 0;
-	long ret;
-	int status;
-	/*
-	 * This is the "control" for our little expermient.  Make sure
-	 * we can always access it when ptracing.
-	 */
-	int *plain_ptr_unaligned = malloc(HPAGE_SIZE);
-	int *plain_ptr = ALIGN_PTR_UP(plain_ptr_unaligned, PAGE_SIZE);
-
-	/*
-	 * Fork a child which is an exact copy of this process, of course.
-	 * That means we can do all of our tests via ptrace() and then plain
-	 * memory access and ensure they work differently.
-	 */
-	child_pid = fork_lazy_child();
-	dprintf1("[%d] child pid: %d\n", getpid(), child_pid);
-
-	ret = ptrace(PTRACE_ATTACH, child_pid, ignored, ignored);
-	if (ret)
-		perror("attach");
-	dprintf1("[%d] attach ret: %ld %d\n", getpid(), ret, __LINE__);
-	pkey_assert(ret != -1);
-	ret = waitpid(child_pid, &status, WUNTRACED);
-	if ((ret != child_pid) || !(WIFSTOPPED(status))) {
-		fprintf(stderr, "weird waitpid result %ld stat %x\n",
-				ret, status);
-		pkey_assert(0);
-	}
-	dprintf2("waitpid ret: %ld\n", ret);
-	dprintf2("waitpid status: %d\n", status);
-
-	pkey_access_deny(pkey);
-	pkey_write_deny(pkey);
-
-	/* Write access, untested for now:
-	ret = ptrace(PTRACE_POKEDATA, child_pid, peek_at, data);
-	pkey_assert(ret != -1);
-	dprintf1("poke at %p: %ld\n", peek_at, ret);
-	*/
-
-	/*
-	 * Try to access the pkey-protected "ptr" via ptrace:
-	 */
-	ret = ptrace(PTRACE_PEEKDATA, child_pid, ptr, ignored);
-	/* expect it to work, without an error: */
-	pkey_assert(ret != -1);
-	/* Now access from the current task, and expect an exception: */
-	peek_result = read_ptr(ptr);
-	expected_pk_fault(pkey);
-
-	/*
-	 * Try to access the NON-pkey-protected "plain_ptr" via ptrace:
-	 */
-	ret = ptrace(PTRACE_PEEKDATA, child_pid, plain_ptr, ignored);
-	/* expect it to work, without an error: */
-	pkey_assert(ret != -1);
-	/* Now access from the current task, and expect NO exception: */
-	peek_result = read_ptr(plain_ptr);
-	do_not_expect_pk_fault("read plain pointer after ptrace");
-
-	ret = ptrace(PTRACE_DETACH, child_pid, ignored, 0);
-	pkey_assert(ret != -1);
-
-	ret = kill(child_pid, SIGKILL);
-	pkey_assert(ret != -1);
-
-	wait(&status);
-
-	free(plain_ptr_unaligned);
-}
-
-void *get_pointer_to_instructions(void)
-{
-	void *p1;
-
-	p1 = ALIGN_PTR_UP(&lots_o_noops_around_write, PAGE_SIZE);
-	dprintf3("&lots_o_noops: %p\n", &lots_o_noops_around_write);
-	/* lots_o_noops_around_write should be page-aligned already */
-	assert(p1 == &lots_o_noops_around_write);
-
-	/* Point 'p1' at the *second* page of the function: */
-	p1 += PAGE_SIZE;
-
-	/*
-	 * Try to ensure we fault this in on next touch to ensure
-	 * we get an instruction fault as opposed to a data one
-	 */
-	madvise(p1, PAGE_SIZE, MADV_DONTNEED);
-
-	return p1;
-}
-
-void test_executing_on_unreadable_memory(int *ptr, u16 pkey)
-{
-	void *p1;
-	int scratch;
-	int ptr_contents;
-	int ret;
-
-	p1 = get_pointer_to_instructions();
-	lots_o_noops_around_write(&scratch);
-	ptr_contents = read_ptr(p1);
-	dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
-
-	ret = mprotect_pkey(p1, PAGE_SIZE, PROT_EXEC, (u64)pkey);
-	pkey_assert(!ret);
-	pkey_access_deny(pkey);
-
-	dprintf2("pkru: %x\n", rdpkru());
-
-	/*
-	 * Make sure this is an *instruction* fault
-	 */
-	madvise(p1, PAGE_SIZE, MADV_DONTNEED);
-	lots_o_noops_around_write(&scratch);
-	do_not_expect_pk_fault("executing on PROT_EXEC memory");
-	ptr_contents = read_ptr(p1);
-	dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
-	expected_pk_fault(pkey);
-}
-
-void test_implicit_mprotect_exec_only_memory(int *ptr, u16 pkey)
-{
-	void *p1;
-	int scratch;
-	int ptr_contents;
-	int ret;
-
-	dprintf1("%s() start\n", __func__);
-
-	p1 = get_pointer_to_instructions();
-	lots_o_noops_around_write(&scratch);
-	ptr_contents = read_ptr(p1);
-	dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
-
-	/* Use a *normal* mprotect(), not mprotect_pkey(): */
-	ret = mprotect(p1, PAGE_SIZE, PROT_EXEC);
-	pkey_assert(!ret);
-
-	dprintf2("pkru: %x\n", rdpkru());
-
-	/* Make sure this is an *instruction* fault */
-	madvise(p1, PAGE_SIZE, MADV_DONTNEED);
-	lots_o_noops_around_write(&scratch);
-	do_not_expect_pk_fault("executing on PROT_EXEC memory");
-	ptr_contents = read_ptr(p1);
-	dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
-	expected_pk_fault(UNKNOWN_PKEY);
-
-	/*
-	 * Put the memory back to non-PROT_EXEC.  Should clear the
-	 * exec-only pkey off the VMA and allow it to be readable
-	 * again.  Go to PROT_NONE first to check for a kernel bug
-	 * that did not clear the pkey when doing PROT_NONE.
-	 */
-	ret = mprotect(p1, PAGE_SIZE, PROT_NONE);
-	pkey_assert(!ret);
-
-	ret = mprotect(p1, PAGE_SIZE, PROT_READ|PROT_EXEC);
-	pkey_assert(!ret);
-	ptr_contents = read_ptr(p1);
-	do_not_expect_pk_fault("plain read on recently PROT_EXEC area");
-}
-
-void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
-{
-	int size = PAGE_SIZE;
-	int sret;
-
-	if (cpu_has_pku()) {
-		dprintf1("SKIP: %s: no CPU support\n", __func__);
-		return;
-	}
-
-	sret = syscall(SYS_mprotect_key, ptr, size, PROT_READ, pkey);
-	pkey_assert(sret < 0);
-}
-
-void (*pkey_tests[])(int *ptr, u16 pkey) = {
-	test_read_of_write_disabled_region,
-	test_read_of_access_disabled_region,
-	test_write_of_write_disabled_region,
-	test_write_of_access_disabled_region,
-	test_kernel_write_of_access_disabled_region,
-	test_kernel_write_of_write_disabled_region,
-	test_kernel_gup_of_access_disabled_region,
-	test_kernel_gup_write_to_write_disabled_region,
-	test_executing_on_unreadable_memory,
-	test_implicit_mprotect_exec_only_memory,
-	test_mprotect_with_pkey_0,
-	test_ptrace_of_child,
-	test_pkey_syscalls_on_non_allocated_pkey,
-	test_pkey_syscalls_bad_args,
-	test_pkey_alloc_exhaust,
-};
-
-void run_tests_once(void)
-{
-	int *ptr;
-	int prot = PROT_READ|PROT_WRITE;
-
-	for (test_nr = 0; test_nr < ARRAY_SIZE(pkey_tests); test_nr++) {
-		int pkey;
-		int orig_pkru_faults = pkru_faults;
-
-		dprintf1("======================\n");
-		dprintf1("test %d preparing...\n", test_nr);
-
-		tracing_on();
-		pkey = alloc_random_pkey();
-		dprintf1("test %d starting with pkey: %d\n", test_nr, pkey);
-		ptr = malloc_pkey(PAGE_SIZE, prot, pkey);
-		dprintf1("test %d starting...\n", test_nr);
-		pkey_tests[test_nr](ptr, pkey);
-		dprintf1("freeing test memory: %p\n", ptr);
-		free_pkey_malloc(ptr);
-		sys_pkey_free(pkey);
-
-		dprintf1("pkru_faults: %d\n", pkru_faults);
-		dprintf1("orig_pkru_faults: %d\n", orig_pkru_faults);
-
-		tracing_off();
-		close_test_fds();
-
-		printf("test %2d PASSED (iteration %d)\n", test_nr, iteration_nr);
-		dprintf1("======================\n\n");
-	}
-	iteration_nr++;
-}
-
-void pkey_setup_shadow(void)
-{
-	shadow_pkru = __rdpkru();
-}
-
-int main(void)
-{
-	int nr_iterations = 22;
-
-	setup_handlers();
-
-	printf("has pku: %d\n", cpu_has_pku());
-
-	if (!cpu_has_pku()) {
-		int size = PAGE_SIZE;
-		int *ptr;
-
-		printf("running PKEY tests for unsupported CPU/OS\n");
-
-		ptr  = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
-		assert(ptr != (void *)-1);
-		test_mprotect_pkey_on_unsupported_cpu(ptr, 1);
-		exit(0);
-	}
-
-	pkey_setup_shadow();
-	printf("startup pkru: %x\n", rdpkru());
-	setup_hugetlbfs();
-
-	while (nr_iterations-- > 0)
-		run_tests_once();
-
-	printf("done (all tests OK)\n");
-	return 0;
-}
-- 
1.7.1