The patch titled
Subject: arch: make execmem setup available regardless of CONFIG_MODULES
has been added to the -mm mm-unstable branch. Its filename is
arch-make-execmem-setup-available-regardless-of-config_modules.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arch-make-execmem-setup-available-regardless-of-config_modules.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
Subject: arch: make execmem setup available regardless of CONFIG_MODULES
Date: Mon, 18 Sep 2023 10:29:52 +0300
execmem does not depend on modules, on the contrary modules use execmem.
To make execmem available when CONFIG_MODULES=n, for instance for kprobes,
split execmem_params initialization out from arch/kernel/module.c and
compile it when CONFIG_EXECMEM=y
Link: https://lkml.kernel.org/r/20230918072955.2507221-11-rppt@xxxxxxxxxx
Signed-off-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: Björn Töpel <bjorn@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Dinh Nguyen <dinguyen@xxxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nadav Amit <nadav.amit@xxxxxxxxx>
Cc: "Naveen N. Rao" <naveen.n.rao@xxxxxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Puranjay Mohan <puranjay12@xxxxxxxxx>
Cc: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>
Cc: Russell King (Oracle) <linux@xxxxxxxxxxxxxxx>
Cc: Song Liu <song@xxxxxxxxxx>
Cc: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/kernel/module.c | 38 --------
arch/arm/mm/init.c | 38 ++++++++
arch/arm64/kernel/module.c | 130 ------------------------------
arch/arm64/mm/init.c | 132 +++++++++++++++++++++++++++++++
arch/loongarch/kernel/module.c | 18 ----
arch/loongarch/mm/init.c | 20 ++++
arch/mips/kernel/module.c | 19 ----
arch/mips/mm/init.c | 20 ++++
arch/parisc/kernel/module.c | 17 ---
arch/parisc/mm/init.c | 22 ++++-
arch/powerpc/kernel/module.c | 60 --------------
arch/powerpc/mm/mem.c | 62 ++++++++++++++
arch/riscv/kernel/module.c | 39 ---------
arch/riscv/mm/init.c | 39 +++++++++
arch/s390/kernel/module.c | 25 -----
arch/s390/mm/init.c | 28 ++++++
arch/sparc/kernel/module.c | 23 -----
arch/sparc/mm/Makefile | 2
arch/sparc/mm/execmem.c | 25 +++++
arch/x86/kernel/module.c | 27 ------
arch/x86/mm/init.c | 29 ++++++
21 files changed, 416 insertions(+), 397 deletions(-)
--- a/arch/arm64/kernel/module.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/arm64/kernel/module.c
@@ -20,142 +20,12 @@
#include <linux/random.h>
#include <linux/scs.h>
#include <linux/vmalloc.h>
-#include <linux/execmem.h>
#include <asm/alternative.h>
#include <asm/insn.h>
#include <asm/scs.h>
#include <asm/sections.h>
-static u64 module_direct_base __ro_after_init = 0;
-static u64 module_plt_base __ro_after_init = 0;
-
-/*
- * Choose a random page-aligned base address for a window of 'size' bytes which
- * entirely contains the interval [start, end - 1].
- */
-static u64 __init random_bounding_box(u64 size, u64 start, u64 end)
-{
- u64 max_pgoff, pgoff;
-
- if ((end - start) >= size)
- return 0;
-
- max_pgoff = (size - (end - start)) / PAGE_SIZE;
- pgoff = get_random_u32_inclusive(0, max_pgoff);
-
- return start - pgoff * PAGE_SIZE;
-}
-
-/*
- * Modules may directly reference data and text anywhere within the kernel
- * image and other modules. References using PREL32 relocations have a +/-2G
- * range, and so we need to ensure that the entire kernel image and all modules
- * fall within a 2G window such that these are always within range.
- *
- * Modules may directly branch to functions and code within the kernel text,
- * and to functions and code within other modules. These branches will use
- * CALL26/JUMP26 relocations with a +/-128M range. Without PLTs, we must ensure
- * that the entire kernel text and all module text falls within a 128M window
- * such that these are always within range. With PLTs, we can expand this to a
- * 2G window.
- *
- * We chose the 128M region to surround the entire kernel image (rather than
- * just the text) as using the same bounds for the 128M and 2G regions ensures
- * by construction that we never select a 128M region that is not a subset of
- * the 2G region. For very large and unusual kernel configurations this means
- * we may fall back to PLTs where they could have been avoided, but this keeps
- * the logic significantly simpler.
- */
-static int __init module_init_limits(void)
-{
- u64 kernel_end = (u64)_end;
- u64 kernel_start = (u64)_text;
- u64 kernel_size = kernel_end - kernel_start;
-
- /*
- * The default modules region is placed immediately below the kernel
- * image, and is large enough to use the full 2G relocation range.
- */
- BUILD_BUG_ON(KIMAGE_VADDR != MODULES_END);
- BUILD_BUG_ON(MODULES_VSIZE < SZ_2G);
-
- if (!kaslr_enabled()) {
- if (kernel_size < SZ_128M)
- module_direct_base = kernel_end - SZ_128M;
- if (kernel_size < SZ_2G)
- module_plt_base = kernel_end - SZ_2G;
- } else {
- u64 min = kernel_start;
- u64 max = kernel_end;
-
- if (IS_ENABLED(CONFIG_RANDOMIZE_MODULE_REGION_FULL)) {
- pr_info("2G module region forced by RANDOMIZE_MODULE_REGION_FULL\n");
- } else {
- module_direct_base = random_bounding_box(SZ_128M, min, max);
- if (module_direct_base) {
- min = module_direct_base;
- max = module_direct_base + SZ_128M;
- }
- }
-
- module_plt_base = random_bounding_box(SZ_2G, min, max);
- }
-
- pr_info("%llu pages in range for non-PLT usage",
- module_direct_base ? (SZ_128M - kernel_size) / PAGE_SIZE : 0);
- pr_info("%llu pages in range for PLT usage",
- module_plt_base ? (SZ_2G - kernel_size) / PAGE_SIZE : 0);
-
- return 0;
-}
-
-static struct execmem_params execmem_params __ro_after_init = {
- .ranges = {
- [EXECMEM_DEFAULT] = {
- .flags = EXECMEM_KASAN_SHADOW,
- .alignment = MODULE_ALIGN,
- },
- [EXECMEM_KPROBES] = {
- .start = VMALLOC_START,
- .end = VMALLOC_END,
- .alignment = 1,
- },
- [EXECMEM_BPF] = {
- .start = VMALLOC_START,
- .end = VMALLOC_END,
- .alignment = 1,
- },
- },
-};
-
-struct execmem_params __init *execmem_arch_params(void)
-{
- struct execmem_range *r = &execmem_params.ranges[EXECMEM_DEFAULT];
-
- module_init_limits();
-
- r->pgprot = PAGE_KERNEL;
-
- if (module_direct_base) {
- r->start = module_direct_base;
- r->end = module_direct_base + SZ_128M;
-
- if (module_plt_base) {
- r->fallback_start = module_plt_base;
- r->fallback_end = module_plt_base + SZ_2G;
- }
- } else if (module_plt_base) {
- r->start = module_plt_base;
- r->end = module_plt_base + SZ_2G;
- }
-
- execmem_params.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_ROX;
- execmem_params.ranges[EXECMEM_BPF].pgprot = PAGE_KERNEL;
-
- return &execmem_params;
-}
-
enum aarch64_reloc_op {
RELOC_OP_NONE,
RELOC_OP_ABS,
--- a/arch/arm64/mm/init.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/arm64/mm/init.c
@@ -31,6 +31,7 @@
#include <linux/hugetlb.h>
#include <linux/acpi_iort.h>
#include <linux/kmemleak.h>
+#include <linux/execmem.h>
#include <asm/boot.h>
#include <asm/fixmap.h>
@@ -547,3 +548,134 @@ void dump_mem_limit(void)
pr_emerg("Memory Limit: none\n");
}
}
+
+#ifdef CONFIG_EXECMEM
+static u64 module_direct_base __ro_after_init = 0;
+static u64 module_plt_base __ro_after_init = 0;
+
+/*
+ * Choose a random page-aligned base address for a window of 'size' bytes which
+ * entirely contains the interval [start, end - 1].
+ */
+static u64 __init random_bounding_box(u64 size, u64 start, u64 end)
+{
+ u64 max_pgoff, pgoff;
+
+ if ((end - start) >= size)
+ return 0;
+
+ max_pgoff = (size - (end - start)) / PAGE_SIZE;
+ pgoff = get_random_u32_inclusive(0, max_pgoff);
+
+ return start - pgoff * PAGE_SIZE;
+}
+
+/*
+ * Modules may directly reference data and text anywhere within the kernel
+ * image and other modules. References using PREL32 relocations have a +/-2G
+ * range, and so we need to ensure that the entire kernel image and all modules
+ * fall within a 2G window such that these are always within range.
+ *
+ * Modules may directly branch to functions and code within the kernel text,
+ * and to functions and code within other modules. These branches will use
+ * CALL26/JUMP26 relocations with a +/-128M range. Without PLTs, we must ensure
+ * that the entire kernel text and all module text falls within a 128M window
+ * such that these are always within range. With PLTs, we can expand this to a
+ * 2G window.
+ *
+ * We chose the 128M region to surround the entire kernel image (rather than
+ * just the text) as using the same bounds for the 128M and 2G regions ensures
+ * by construction that we never select a 128M region that is not a subset of
+ * the 2G region. For very large and unusual kernel configurations this means
+ * we may fall back to PLTs where they could have been avoided, but this keeps
+ * the logic significantly simpler.
+ */
+static int __init module_init_limits(void)
+{
+ u64 kernel_end = (u64)_end;
+ u64 kernel_start = (u64)_text;
+ u64 kernel_size = kernel_end - kernel_start;
+
+ /*
+ * The default modules region is placed immediately below the kernel
+ * image, and is large enough to use the full 2G relocation range.
+ */
+ BUILD_BUG_ON(KIMAGE_VADDR != MODULES_END);
+ BUILD_BUG_ON(MODULES_VSIZE < SZ_2G);
+
+ if (!kaslr_enabled()) {
+ if (kernel_size < SZ_128M)
+ module_direct_base = kernel_end - SZ_128M;
+ if (kernel_size < SZ_2G)
+ module_plt_base = kernel_end - SZ_2G;
+ } else {
+ u64 min = kernel_start;
+ u64 max = kernel_end;
+
+ if (IS_ENABLED(CONFIG_RANDOMIZE_MODULE_REGION_FULL)) {
+ pr_info("2G module region forced by RANDOMIZE_MODULE_REGION_FULL\n");
+ } else {
+ module_direct_base = random_bounding_box(SZ_128M, min, max);
+ if (module_direct_base) {
+ min = module_direct_base;
+ max = module_direct_base + SZ_128M;
+ }
+ }
+
+ module_plt_base = random_bounding_box(SZ_2G, min, max);
+ }
+
+ pr_info("%llu pages in range for non-PLT usage",
+ module_direct_base ? (SZ_128M - kernel_size) / PAGE_SIZE : 0);
+ pr_info("%llu pages in range for PLT usage",
+ module_plt_base ? (SZ_2G - kernel_size) / PAGE_SIZE : 0);
+
+ return 0;
+}
+
+static struct execmem_params execmem_params __ro_after_init = {
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+ .flags = EXECMEM_KASAN_SHADOW,
+ .alignment = MODULE_ALIGN,
+ },
+ [EXECMEM_KPROBES] = {
+ .start = VMALLOC_START,
+ .end = VMALLOC_END,
+ .alignment = 1,
+ },
+ [EXECMEM_BPF] = {
+ .start = VMALLOC_START,
+ .end = VMALLOC_END,
+ .alignment = 1,
+ },
+ },
+};
+
+struct execmem_params __init *execmem_arch_params(void)
+{
+ struct execmem_range *r = &execmem_params.ranges[EXECMEM_DEFAULT];
+
+ module_init_limits();
+
+ r->pgprot = PAGE_KERNEL;
+
+ if (module_direct_base) {
+ r->start = module_direct_base;
+ r->end = module_direct_base + SZ_128M;
+
+ if (module_plt_base) {
+ r->fallback_start = module_plt_base;
+ r->fallback_end = module_plt_base + SZ_2G;
+ }
+ } else if (module_plt_base) {
+ r->start = module_plt_base;
+ r->end = module_plt_base + SZ_2G;
+ }
+
+ execmem_params.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_ROX;
+ execmem_params.ranges[EXECMEM_BPF].pgprot = PAGE_KERNEL;
+
+ return &execmem_params;
+}
+#endif
--- a/arch/arm/kernel/module.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/arm/kernel/module.c
@@ -16,50 +16,12 @@
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/gfp.h>
-#include <linux/execmem.h>
#include <asm/sections.h>
#include <asm/smp_plat.h>
#include <asm/unwind.h>
#include <asm/opcodes.h>
-#ifdef CONFIG_XIP_KERNEL
-/*
- * The XIP kernel text is mapped in the module area for modules and
- * some other stuff to work without any indirect relocations.
- * MODULES_VADDR is redefined here and not in asm/memory.h to avoid
- * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
- */
-#undef MODULES_VADDR
-#define MODULES_VADDR (((unsigned long)_exiprom + ~PMD_MASK) & PMD_MASK)
-#endif
-
-#ifdef CONFIG_MMU
-static struct execmem_params execmem_params __ro_after_init = {
- .ranges = {
- [EXECMEM_DEFAULT] = {
- .start = MODULES_VADDR,
- .end = MODULES_END,
- .alignment = 1,
- },
- },
-};
-
-struct execmem_params __init *execmem_arch_params(void)
-{
- struct execmem_range *r = &execmem_params.ranges[EXECMEM_DEFAULT];
-
- r->pgprot = PAGE_KERNEL_EXEC;
-
- if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS)) {
- r->fallback_start = VMALLOC_START;
- r->fallback_end = VMALLOC_END;
- }
-
- return &execmem_params;
-}
-#endif
-
bool module_init_section(const char *name)
{
return strstarts(name, ".init") ||
--- a/arch/arm/mm/init.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/arm/mm/init.c
@@ -22,6 +22,7 @@
#include <linux/sizes.h>
#include <linux/stop_machine.h>
#include <linux/swiotlb.h>
+#include <linux/execmem.h>
#include <asm/cp15.h>
#include <asm/mach-types.h>
@@ -486,3 +487,40 @@ void free_initrd_mem(unsigned long start
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
+
+#ifdef CONFIG_XIP_KERNEL
+/*
+ * The XIP kernel text is mapped in the module area for modules and
+ * some other stuff to work without any indirect relocations.
+ * MODULES_VADDR is redefined here and not in asm/memory.h to avoid
+ * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
+ */
+#undef MODULES_VADDR
+#define MODULES_VADDR (((unsigned long)_exiprom + ~PMD_MASK) & PMD_MASK)
+#endif
+
+#if defined(CONFIG_MMU) && defined(CONFIG_EXECMEM)
+static struct execmem_params execmem_params __ro_after_init = {
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+ .start = MODULES_VADDR,
+ .end = MODULES_END,
+ .alignment = 1,
+ },
+ },
+};
+
+struct execmem_params __init *execmem_arch_params(void)
+{
+ struct execmem_range *r = &execmem_params.ranges[EXECMEM_DEFAULT];
+
+ r->pgprot = PAGE_KERNEL_EXEC;
+
+ if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS)) {
+ r->fallback_start = VMALLOC_START;
+ r->fallback_end = VMALLOC_END;
+ }
+
+ return &execmem_params;
+}
+#endif
--- a/arch/loongarch/kernel/module.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/loongarch/kernel/module.c
@@ -18,7 +18,6 @@
#include <linux/ftrace.h>
#include <linux/string.h>
#include <linux/kernel.h>
-#include <linux/execmem.h>
#include <asm/alternative.h>
#include <asm/inst.h>
@@ -470,23 +469,6 @@ int apply_relocate_add(Elf_Shdr *sechdrs
return 0;
}
-static struct execmem_params execmem_params __ro_after_init = {
- .ranges = {
- [EXECMEM_DEFAULT] = {
- .pgprot = PAGE_KERNEL,
- .alignment = 1,
- },
- },
-};
-
-struct execmem_params __init *execmem_arch_params(void)
-{
- execmem_params.ranges[EXECMEM_DEFAULT].start = MODULES_VADDR;
- execmem_params.ranges[EXECMEM_DEFAULT].end = MODULES_END;
-
- return &execmem_params;
-}
-
static void module_init_ftrace_plt(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs, struct module *mod)
{
--- a/arch/loongarch/mm/init.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/loongarch/mm/init.c
@@ -24,6 +24,7 @@
#include <linux/gfp.h>
#include <linux/hugetlb.h>
#include <linux/mmzone.h>
+#include <linux/execmem.h>
#include <asm/asm-offsets.h>
#include <asm/bootinfo.h>
@@ -247,3 +248,22 @@ EXPORT_SYMBOL(invalid_pmd_table);
#endif
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
EXPORT_SYMBOL(invalid_pte_table);
+
+#ifdef CONFIG_EXECMEM
+static struct execmem_params execmem_params __ro_after_init = {
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+ .pgprot = PAGE_KERNEL,
+ .alignment = 1,
+ },
+ },
+};
+
+struct execmem_params __init *execmem_arch_params(void)
+{
+ execmem_params.ranges[EXECMEM_DEFAULT].start = MODULES_VADDR;
+ execmem_params.ranges[EXECMEM_DEFAULT].end = MODULES_END;
+
+ return &execmem_params;
+}
+#endif
--- a/arch/mips/kernel/module.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/mips/kernel/module.c
@@ -33,25 +33,6 @@ struct mips_hi16 {
static LIST_HEAD(dbe_list);
static DEFINE_SPINLOCK(dbe_lock);
-#ifdef MODULE_START
-static struct execmem_params execmem_params __ro_after_init = {
- .ranges = {
- [EXECMEM_DEFAULT] = {
- .start = MODULE_START,
- .end = MODULE_END,
- .alignment = 1,
- },
- },
-};
-
-struct execmem_params __init *execmem_arch_params(void)
-{
- execmem_params.ranges[EXECMEM_DEFAULT].pgprot = PAGE_KERNEL;
-
- return &execmem_params;
-}
-#endif
-
static void apply_r_mips_32(u32 *location, u32 base, Elf_Addr v)
{
*location = base + v;
--- a/arch/mips/mm/init.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/mips/mm/init.c
@@ -31,6 +31,7 @@
#include <linux/gfp.h>
#include <linux/kcore.h>
#include <linux/initrd.h>
+#include <linux/execmem.h>
#include <asm/bootinfo.h>
#include <asm/cachectl.h>
@@ -573,3 +574,22 @@ EXPORT_SYMBOL_GPL(invalid_pmd_table);
#endif
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
EXPORT_SYMBOL(invalid_pte_table);
+
+#if defined(CONFIG_EXECMEM) && defined(MODULE_START)
+static struct execmem_params execmem_params __ro_after_init = {
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+ .start = MODULE_START,
+ .end = MODULE_END,
+ .alignment = 1,
+ },
+ },
+};
+
+struct execmem_params __init *execmem_arch_params(void)
+{
+ execmem_params.ranges[EXECMEM_DEFAULT].pgprot = PAGE_KERNEL;
+
+ return &execmem_params;
+}
+#endif
--- a/arch/parisc/kernel/module.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/parisc/kernel/module.c
@@ -174,23 +174,6 @@ static inline int reassemble_22(int as22
((as22 & 0x0003ff) << 3));
}
-static struct execmem_params execmem_params __ro_after_init = {
- .ranges = {
- [EXECMEM_DEFAULT] = {
- .pgprot = PAGE_KERNEL_RWX,
- .alignment = 1,
- },
- },
-};
-
-struct execmem_params __init *execmem_arch_params(void)
-{
- execmem_params.ranges[EXECMEM_DEFAULT].start = VMALLOC_START;
- execmem_params.ranges[EXECMEM_DEFAULT].end = VMALLOC_END;
-
- return &execmem_params;
-}
-
#ifndef CONFIG_64BIT
static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
{
--- a/arch/parisc/mm/init.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/parisc/mm/init.c
@@ -24,6 +24,7 @@
#include <linux/nodemask.h> /* for node_online_map */
#include <linux/pagemap.h> /* for release_pages */
#include <linux/compat.h>
+#include <linux/execmem.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>
@@ -479,7 +480,7 @@ void free_initmem(void)
/* finally dump all the instructions which were cached, since the
* pages are no-longer executable */
flush_icache_range(init_begin, init_end);
-
+
free_initmem_default(POISON_FREE_INITMEM);
/* set up a new led state on systems shipped LED State panel */
@@ -919,3 +920,22 @@ static const pgprot_t protection_map[16]
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_RWX
};
DECLARE_VM_GET_PAGE_PROT
+
+#ifdef CONFIG_EXECMEM
+static struct execmem_params execmem_params __ro_after_init = {
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+ .pgprot = PAGE_KERNEL_RWX,
+ .alignment = 1,
+ },
+ },
+};
+
+struct execmem_params __init *execmem_arch_params(void)
+{
+ execmem_params.ranges[EXECMEM_DEFAULT].start = VMALLOC_START;
+ execmem_params.ranges[EXECMEM_DEFAULT].end = VMALLOC_END;
+
+ return &execmem_params;
+}
+#endif
--- a/arch/powerpc/kernel/module.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/powerpc/kernel/module.c
@@ -10,7 +10,6 @@
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/bug.h>
-#include <linux/execmem.h>
#include <asm/module.h>
#include <linux/uaccess.h>
#include <asm/firmware.h>
@@ -89,62 +88,3 @@ int module_finalize(const Elf_Ehdr *hdr,
return 0;
}
-
-static struct execmem_params execmem_params __ro_after_init = {
- .ranges = {
- [EXECMEM_DEFAULT] = {
- .alignment = 1,
- },
- [EXECMEM_KPROBES] = {
- .alignment = 1,
- },
- [EXECMEM_MODULE_DATA] = {
- .alignment = 1,
- },
- },
-};
-
-struct execmem_params __init *execmem_arch_params(void)
-{
- pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC;
- struct execmem_range *range = &execmem_params.ranges[EXECMEM_DEFAULT];
-
- /*
- * BOOK3S_32 and 8xx define MODULES_VADDR for text allocations and
- * allow allocating data in the entire vmalloc space
- */
-#ifdef MODULES_VADDR
- struct execmem_range *data = &execmem_params.ranges[EXECMEM_MODULE_DATA];
- unsigned long limit = (unsigned long)_etext - SZ_32M;
-
- /* First try within 32M limit from _etext to avoid branch trampolines */
- if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) {
- range->start = limit;
- range->end = MODULES_END;
- range->fallback_start = MODULES_VADDR;
- range->fallback_end = MODULES_END;
- } else {
- range->start = MODULES_VADDR;
- range->end = MODULES_END;
- }
- data->start = VMALLOC_START;
- data->end = VMALLOC_END;
- data->pgprot = PAGE_KERNEL;
- data->alignment = 1;
-#else
- range->start = VMALLOC_START;
- range->end = VMALLOC_END;
-#endif
-
- range->pgprot = prot;
-
- execmem_params.ranges[EXECMEM_KPROBES].start = VMALLOC_START;
- execmem_params.ranges[EXECMEM_KPROBES].start = VMALLOC_END;
-
- if (strict_module_rwx_enabled())
- execmem_params.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_ROX;
- else
- execmem_params.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_EXEC;
-
- return &execmem_params;
-}
--- a/arch/powerpc/mm/mem.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/powerpc/mm/mem.c
@@ -16,6 +16,7 @@
#include <linux/highmem.h>
#include <linux/suspend.h>
#include <linux/dma-direct.h>
+#include <linux/execmem.h>
#include <asm/swiotlb.h>
#include <asm/machdep.h>
@@ -406,3 +407,64 @@ int devmem_is_allowed(unsigned long pfn)
* the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed.
*/
EXPORT_SYMBOL_GPL(walk_system_ram_range);
+
+#ifdef CONFIG_EXECMEM
+static struct execmem_params execmem_params __ro_after_init = {
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+ .alignment = 1,
+ },
+ [EXECMEM_KPROBES] = {
+ .alignment = 1,
+ },
+ [EXECMEM_MODULE_DATA] = {
+ .alignment = 1,
+ },
+ },
+};
+
+struct execmem_params __init *execmem_arch_params(void)
+{
+ pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC;
+ struct execmem_range *range = &execmem_params.ranges[EXECMEM_DEFAULT];
+
+ /*
+ * BOOK3S_32 and 8xx define MODULES_VADDR for text allocations and
+ * allow allocating data in the entire vmalloc space
+ */
+#ifdef MODULES_VADDR
+ struct execmem_range *data = &execmem_params.ranges[EXECMEM_MODULE_DATA];
+ unsigned long limit = (unsigned long)_etext - SZ_32M;
+
+ /* First try within 32M limit from _etext to avoid branch trampolines */
+ if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) {
+ range->start = limit;
+ range->end = MODULES_END;
+ range->fallback_start = MODULES_VADDR;
+ range->fallback_end = MODULES_END;
+ } else {
+ range->start = MODULES_VADDR;
+ range->end = MODULES_END;
+ }
+ data->start = VMALLOC_START;
+ data->end = VMALLOC_END;
+ data->pgprot = PAGE_KERNEL;
+ data->alignment = 1;
+#else
+ range->start = VMALLOC_START;
+ range->end = VMALLOC_END;
+#endif
+
+ range->pgprot = prot;
+
+ execmem_params.ranges[EXECMEM_KPROBES].start = VMALLOC_START;
+ execmem_params.ranges[EXECMEM_KPROBES].start = VMALLOC_END;
+
+ if (strict_module_rwx_enabled())
+ execmem_params.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_ROX;
+ else
+ execmem_params.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_EXEC;
+
+ return &execmem_params;
+}
+#endif
--- a/arch/riscv/kernel/module.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/riscv/kernel/module.c
@@ -11,7 +11,6 @@
#include <linux/vmalloc.h>
#include <linux/sizes.h>
#include <linux/pgtable.h>
-#include <linux/execmem.h>
#include <asm/alternative.h>
#include <asm/sections.h>
@@ -436,44 +435,6 @@ int apply_relocate_add(Elf_Shdr *sechdrs
return 0;
}
-#ifdef CONFIG_MMU
-static struct execmem_params execmem_params __ro_after_init = {
- .ranges = {
- [EXECMEM_DEFAULT] = {
- .pgprot = PAGE_KERNEL,
- .alignment = 1,
- },
- [EXECMEM_KPROBES] = {
- .pgprot = PAGE_KERNEL_READ_EXEC,
- .alignment = 1,
- },
- [EXECMEM_BPF] = {
- .pgprot = PAGE_KERNEL,
- .alignment = 1,
- },
- },
-};
-
-struct execmem_params __init *execmem_arch_params(void)
-{
-#ifdef CONFIG_64BIT
- execmem_params.ranges[EXECMEM_DEFAULT].start = MODULES_VADDR;
- execmem_params.ranges[EXECMEM_DEFAULT].end = MODULES_END;
-#else
- execmem_params.ranges[EXECMEM_DEFAULT].start = VMALLOC_START;
- execmem_params.ranges[EXECMEM_DEFAULT].end = VMALLOC_END;
-#endif
-
- execmem_params.ranges[EXECMEM_KPROBES].start = VMALLOC_START;
- execmem_params.ranges[EXECMEM_KPROBES].end = VMALLOC_END;
-
- execmem_params.ranges[EXECMEM_BPF].start = BPF_JIT_REGION_START;
- execmem_params.ranges[EXECMEM_BPF].end = BPF_JIT_REGION_END;
-
- return &execmem_params;
-}
-#endif
-
int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
struct module *me)
--- a/arch/riscv/mm/init.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/riscv/mm/init.c
@@ -24,6 +24,7 @@
#include <linux/elf.h>
#endif
#include <linux/kfence.h>
+#include <linux/execmem.h>
#include <asm/fixmap.h>
#include <asm/io.h>
@@ -1564,3 +1565,41 @@ void __init pgtable_cache_init(void)
preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules");
}
#endif
+
+#if defined(CONFIG_MMU) && defined(CONFIG_EXECMEM)
+static struct execmem_params execmem_params __ro_after_init = {
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+ .pgprot = PAGE_KERNEL,
+ .alignment = 1,
+ },
+ [EXECMEM_KPROBES] = {
+ .pgprot = PAGE_KERNEL_READ_EXEC,
+ .alignment = 1,
+ },
+ [EXECMEM_BPF] = {
+ .pgprot = PAGE_KERNEL,
+ .alignment = 1,
+ },
+ },
+};
+
+struct execmem_params __init *execmem_arch_params(void)
+{
+#ifdef CONFIG_64BIT
+ execmem_params.ranges[EXECMEM_DEFAULT].start = MODULES_VADDR;
+ execmem_params.ranges[EXECMEM_DEFAULT].end = MODULES_END;
+#else
+ execmem_params.ranges[EXECMEM_DEFAULT].start = VMALLOC_START;
+ execmem_params.ranges[EXECMEM_DEFAULT].end = VMALLOC_END;
+#endif
+
+ execmem_params.ranges[EXECMEM_KPROBES].start = VMALLOC_START;
+ execmem_params.ranges[EXECMEM_KPROBES].end = VMALLOC_END;
+
+ execmem_params.ranges[EXECMEM_BPF].start = BPF_JIT_REGION_START;
+ execmem_params.ranges[EXECMEM_BPF].end = BPF_JIT_REGION_END;
+
+ return &execmem_params;
+}
+#endif
--- a/arch/s390/kernel/module.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/s390/kernel/module.c
@@ -37,31 +37,6 @@
#define PLT_ENTRY_SIZE 22
-static struct execmem_params execmem_params __ro_after_init = {
- .ranges = {
- [EXECMEM_DEFAULT] = {
- .flags = EXECMEM_KASAN_SHADOW,
- .alignment = MODULE_ALIGN,
- .pgprot = PAGE_KERNEL,
- },
- },
-};
-
-struct execmem_params __init *execmem_arch_params(void)
-{
- unsigned long module_load_offset = 0;
- unsigned long start;
-
- if (kaslr_enabled())
- module_load_offset = get_random_u32_inclusive(1, 1024) * PAGE_SIZE;
-
- start = MODULES_VADDR + module_load_offset;
- execmem_params.ranges[EXECMEM_DEFAULT].start = start;
- execmem_params.ranges[EXECMEM_DEFAULT].end = MODULES_END;
-
- return &execmem_params;
-}
-
#ifdef CONFIG_FUNCTION_TRACER
void module_arch_cleanup(struct module *mod)
{
--- a/arch/s390/mm/init.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/s390/mm/init.c
@@ -34,6 +34,7 @@
#include <linux/percpu.h>
#include <asm/processor.h>
#include <linux/uaccess.h>
+#include <linux/execmem.h>
#include <asm/pgalloc.h>
#include <asm/kfence.h>
#include <asm/ptdump.h>
@@ -311,3 +312,30 @@ void arch_remove_memory(u64 start, u64 s
vmem_remove_mapping(start, size);
}
#endif /* CONFIG_MEMORY_HOTPLUG */
+
+#ifdef CONFIG_EXECMEM
+static struct execmem_params execmem_params __ro_after_init = {
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+ .flags = EXECMEM_KASAN_SHADOW,
+ .alignment = MODULE_ALIGN,
+ .pgprot = PAGE_KERNEL,
+ },
+ },
+};
+
+struct execmem_params __init *execmem_arch_params(void)
+{
+ unsigned long module_load_offset = 0;
+ unsigned long start;
+
+ if (kaslr_enabled())
+ module_load_offset = get_random_u32_inclusive(1, 1024) * PAGE_SIZE;
+
+ start = MODULES_VADDR + module_load_offset;
+ execmem_params.ranges[EXECMEM_DEFAULT].start = start;
+ execmem_params.ranges[EXECMEM_DEFAULT].end = MODULES_END;
+
+ return &execmem_params;
+}
+#endif
--- a/arch/sparc/kernel/module.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/sparc/kernel/module.c
@@ -14,7 +14,6 @@
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/mm.h>
-#include <linux/execmem.h>
#ifdef CONFIG_SPARC64
#include <linux/jump_label.h>
#endif
@@ -25,28 +24,6 @@
#include "entry.h"
-static struct execmem_params execmem_params __ro_after_init = {
- .ranges = {
- [EXECMEM_DEFAULT] = {
-#ifdef CONFIG_SPARC64
- .start = MODULES_VADDR,
- .end = MODULES_END,
-#else
- .start = VMALLOC_START,
- .end = VMALLOC_END,
-#endif
- .alignment = 1,
- },
- },
-};
-
-struct execmem_params __init *execmem_arch_params(void)
-{
- execmem_params.ranges[EXECMEM_DEFAULT].pgprot = PAGE_KERNEL;
-
- return &execmem_params;
-}
-
/* Make generic code ignore STT_REGISTER dummy undefined symbols. */
int module_frob_arch_sections(Elf_Ehdr *hdr,
Elf_Shdr *sechdrs,
--- /dev/null
+++ a/arch/sparc/mm/execmem.c
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/mm.h>
+#include <linux/execmem.h>
+
+static struct execmem_params execmem_params __ro_after_init = {
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+#ifdef CONFIG_SPARC64
+ .start = MODULES_VADDR,
+ .end = MODULES_END,
+#else
+ .start = VMALLOC_START,
+ .end = VMALLOC_END,
+#endif
+ .alignment = 1,
+ },
+ },
+};
+
+struct execmem_params __init *execmem_arch_params(void)
+{
+ execmem_params.ranges[EXECMEM_DEFAULT].pgprot = PAGE_KERNEL;
+
+ return &execmem_params;
+}
--- a/arch/sparc/mm/Makefile~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/sparc/mm/Makefile
@@ -15,3 +15,5 @@ obj-$(CONFIG_SPARC32) += leon_mm.o
# Only used by sparc64
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
+
+obj-$(CONFIG_EXECMEM) += execmem.o
--- a/arch/x86/kernel/module.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/x86/kernel/module.c
@@ -19,7 +19,6 @@
#include <linux/jump_label.h>
#include <linux/random.h>
#include <linux/memory.h>
-#include <linux/execmem.h>
#include <asm/text-patching.h>
#include <asm/page.h>
@@ -37,32 +36,6 @@ do { \
} while (0)
#endif
-static struct execmem_params execmem_params __ro_after_init = {
- .ranges = {
- [EXECMEM_DEFAULT] = {
- .flags = EXECMEM_KASAN_SHADOW,
- .alignment = MODULE_ALIGN,
- },
- },
-};
-
-struct execmem_params __init *execmem_arch_params(void)
-{
- unsigned long module_load_offset = 0;
- unsigned long start;
-
- if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_enabled())
- module_load_offset =
- get_random_u32_inclusive(1, 1024) * PAGE_SIZE;
-
- start = MODULES_VADDR + module_load_offset;
- execmem_params.ranges[EXECMEM_DEFAULT].start = start;
- execmem_params.ranges[EXECMEM_DEFAULT].end = MODULES_END;
- execmem_params.ranges[EXECMEM_DEFAULT].pgprot = PAGE_KERNEL;
-
- return &execmem_params;
-}
-
#ifdef CONFIG_X86_32
int apply_relocate(Elf32_Shdr *sechdrs,
const char *strtab,
--- a/arch/x86/mm/init.c~arch-make-execmem-setup-available-regardless-of-config_modules
+++ a/arch/x86/mm/init.c
@@ -7,6 +7,7 @@
#include <linux/swapops.h>
#include <linux/kmemleak.h>
#include <linux/sched/task.h>
+#include <linux/execmem.h>
#include <asm/set_memory.h>
#include <asm/cpu_device_id.h>
@@ -1099,3 +1100,31 @@ unsigned long arch_max_swapfile_size(voi
return pages;
}
#endif
+
+#ifdef CONFIG_EXECMEM
+static struct execmem_params execmem_params __ro_after_init = {
+ .ranges = {
+ [EXECMEM_DEFAULT] = {
+ .flags = EXECMEM_KASAN_SHADOW,
+ .alignment = MODULE_ALIGN,
+ },
+ },
+};
+
+struct execmem_params __init *execmem_arch_params(void)
+{
+ unsigned long module_load_offset = 0;
+ unsigned long start;
+
+ if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_enabled())
+ module_load_offset =
+ get_random_u32_inclusive(1, 1024) * PAGE_SIZE;
+
+ start = MODULES_VADDR + module_load_offset;
+ execmem_params.ranges[EXECMEM_DEFAULT].start = start;
+ execmem_params.ranges[EXECMEM_DEFAULT].end = MODULES_END;
+ execmem_params.ranges[EXECMEM_DEFAULT].pgprot = PAGE_KERNEL;
+
+ return &execmem_params;
+}
+#endif /* CONFIG_EXECMEM */
_
Patches currently in -mm which might be from rppt@xxxxxxxxxx are
nios2-define-virtual-address-space-for-modules.patch
mm-introduce-execmem_text_alloc-and-execmem_free.patch
mm-execmem-arch-convert-simple-overrides-of-module_alloc-to-execmem.patch
mm-execmem-arch-convert-remaining-overrides-of-module_alloc-to-execmem.patch
modules-execmem-drop-module_alloc.patch
mm-execmem-introduce-execmem_data_alloc.patch
arm64-execmem-extend-execmem_params-for-generated-code-allocations.patch
riscv-extend-execmem_params-for-generated-code-allocations.patch
powerpc-extend-execmem_params-for-kprobes-allocations.patch
arch-make-execmem-setup-available-regardless-of-config_modules.patch
x86-ftrace-enable-dynamic-ftrace-without-config_modules.patch
kprobes-remove-dependency-on-config_modules.patch
bpf-remove-config_bpf_jit-dependency-on-config_modules-of.patch
