The patch titled
Subject: proc: test /proc/self/syscall
has been added to the -mm tree. Its filename is
proc-test-proc-self-syscall.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-test-proc-self-syscall.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/proc-test-proc-self-syscall.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Subject: proc: test /proc/self/syscall
Read from /proc/self/syscall should yield read system call and correct
args in the output as current is reading /proc/self/syscall.
Link: http://lkml.kernel.org/r/20180226212145.GB742@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/proc/.gitignore | 3
tools/testing/selftests/proc/Makefile | 1
tools/testing/selftests/proc/proc-self-syscall.c | 45 +++++++++++++
3 files changed, 48 insertions(+), 1 deletion(-)
diff -puN tools/testing/selftests/proc/.gitignore~proc-test-proc-self-syscall tools/testing/selftests/proc/.gitignore
--- a/tools/testing/selftests/proc/.gitignore~proc-test-proc-self-syscall
+++ a/tools/testing/selftests/proc/.gitignore
@@ -1 +1,2 @@
-/proc-self-wchan
+/proc-self-mem
+/proc-self-syscall
diff -puN tools/testing/selftests/proc/Makefile~proc-test-proc-self-syscall tools/testing/selftests/proc/Makefile
--- a/tools/testing/selftests/proc/Makefile~proc-test-proc-self-syscall
+++ a/tools/testing/selftests/proc/Makefile
@@ -1,6 +1,7 @@
CFLAGS += -Wall -O2
TEST_GEN_PROGS :=
+TEST_GEN_PROGS += proc-self-syscall
TEST_GEN_PROGS += proc-self-wchan
include ../lib.mk
diff -puN /dev/null tools/testing/selftests/proc/proc-self-syscall.c
--- /dev/null
+++ a/tools/testing/selftests/proc/proc-self-syscall.c
@@ -0,0 +1,45 @@
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+
+static inline ssize_t sys_read(int fd, void *buf, size_t len)
+{
+ return syscall(SYS_read, fd, buf, len);
+}
+
+int main(void)
+{
+ char buf1[64];
+ char buf2[64];
+ int fd;
+ ssize_t rv;
+
+ fd = open("/proc/self/syscall", O_RDONLY);
+ if (fd == -1) {
+ if (errno == ENOENT)
+ return 2;
+ return 1;
+ }
+
+ /* Do direct system call as libc can wrap anything. */
+ snprintf(buf1, sizeof(buf1), "%ld 0x%lx 0x%lx 0x%lx",
+ (long)SYS_read, (long)fd, (long)buf2, (long)sizeof(buf2));
+
+ memset(buf2, 0, sizeof(buf2));
+ rv = sys_read(fd, buf2, sizeof(buf2));
+ if (rv < 0)
+ return 1;
+ if (rv < strlen(buf1))
+ return 1;
+ if (strncmp(buf1, buf2, strlen(buf1)) != 0)
+ return 1;
+
+ return 0;
+}
_
Patches currently in -mm which might be from adobriyan@xxxxxxxxx are
proc-do-less-stuff-under-pde_unload_lock.patch
proc-move-proc-sysvipc-creation-to-where-it-belongs.patch
proc-faster-open-close-of-files-without-release-hook.patch
proc-randomize-struct-pde_opener.patch
proc-move-struct-pde_opener-to-kmem-cache.patch
proc-account-struct-pde_opener.patch
proc-check-permissions-earlier-for-proc-wchan.patch
proc-use-set_puts-at-proc-wchan.patch
proc-test-proc-self-wchan.patch
proc-test-proc-self-syscall.patch
uts-create-struct-uts_namespace-from-kmem_cache.patch
seq_file-delete-small-value-optimization.patch
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