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arch: make execmem setup available regardless of CONFIG_MODULES

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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

Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Mike Rapoport (IBM) 2024-05-05 19:06:24 +03:00 committed by Luis Chamberlain
parent 1b750c2fbf
commit 0cc2dc4902
23 changed files with 453 additions and 435 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
arch/arm/kernel/module.c
View File

@ -12,57 +12,14 @@
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#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_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
unsigned long fallback_start = 0, fallback_end = 0;
if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS)) {
fallback_start = VMALLOC_START;
fallback_end = VMALLOC_END;
}
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL_EXEC,
.alignment = 1,
.fallback_start = fallback_start,
.fallback_end = fallback_end,
},
},
};
return &execmem_info;
}
#endif
bool module_init_section(const char *name)
{
return strstarts(name, ".init") ||

45
arch/arm/mm/init.c
View File

@ -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 +487,47 @@ void free_initrd_mem(unsigned long start, unsigned long end)
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
#ifdef CONFIG_EXECMEM
#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_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
unsigned long fallback_start = 0, fallback_end = 0;
if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS)) {
fallback_start = VMALLOC_START;
fallback_end = VMALLOC_END;
}
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL_EXEC,
.alignment = 1,
.fallback_start = fallback_start,
.fallback_end = fallback_end,
},
},
};
return &execmem_info;
}
#endif /* CONFIG_MMU */
#endif /* CONFIG_EXECMEM */

140
arch/arm64/kernel/module.c
View File

@ -12,158 +12,18 @@
#include <linux/bitops.h>
#include <linux/elf.h>
#include <linux/ftrace.h>
#include <linux/gfp.h>
#include <linux/kasan.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/moduleloader.h>
#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_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
unsigned long fallback_start = 0, fallback_end = 0;
unsigned long start = 0, end = 0;
module_init_limits();
/*
* Where possible, prefer to allocate within direct branch range of the
* kernel such that no PLTs are necessary.
*/
if (module_direct_base) {
start = module_direct_base;
end = module_direct_base + SZ_128M;
if (module_plt_base) {
fallback_start = module_plt_base;
fallback_end = module_plt_base + SZ_2G;
}
} else if (module_plt_base) {
start = module_plt_base;
end = module_plt_base + SZ_2G;
}
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = start,
.end = end,
.pgprot = PAGE_KERNEL,
.alignment = 1,
.fallback_start = fallback_start,
.fallback_end = fallback_end,
},
[EXECMEM_KPROBES] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = PAGE_KERNEL_ROX,
.alignment = 1,
},
[EXECMEM_BPF] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
},
};
return &execmem_info;
}
enum aarch64_reloc_op {
RELOC_OP_NONE,
RELOC_OP_ABS,

140
arch/arm64/mm/init.c
View File

@ -32,6 +32,7 @@
#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>
@ -432,3 +433,142 @@ 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_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
unsigned long fallback_start = 0, fallback_end = 0;
unsigned long start = 0, end = 0;
module_init_limits();
/*
* Where possible, prefer to allocate within direct branch range of the
* kernel such that no PLTs are necessary.
*/
if (module_direct_base) {
start = module_direct_base;
end = module_direct_base + SZ_128M;
if (module_plt_base) {
fallback_start = module_plt_base;
fallback_end = module_plt_base + SZ_2G;
}
} else if (module_plt_base) {
start = module_plt_base;
end = module_plt_base + SZ_2G;
}
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = start,
.end = end,
.pgprot = PAGE_KERNEL,
.alignment = 1,
.fallback_start = fallback_start,
.fallback_end = fallback_end,
},
[EXECMEM_KPROBES] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = PAGE_KERNEL_ROX,
.alignment = 1,
},
[EXECMEM_BPF] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
},
};
return &execmem_info;
}
#endif /* CONFIG_EXECMEM */

19
arch/loongarch/kernel/module.c
View File

@ -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>
#include <asm/unwind.h>
@ -491,24 +490,6 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
return 0;
}
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
},
};
return &execmem_info;
}
static void module_init_ftrace_plt(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs, struct module *mod)
{

21
arch/loongarch/mm/init.c
View File

@ -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>
@ -248,3 +249,23 @@ 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_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
},
};
return &execmem_info;
}
#endif /* CONFIG_EXECMEM */

22
arch/mips/kernel/module.c
View File

@ -13,14 +13,12 @@
#include <linux/elf.h>
#include <linux/mm.h>
#include <linux/numa.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/jump_label.h>
#include <linux/execmem.h>
#include <asm/jump_label.h>
struct mips_hi16 {
@ -32,26 +30,6 @@ struct mips_hi16 {
static LIST_HEAD(dbe_list);
static DEFINE_SPINLOCK(dbe_lock);
#ifdef MODULES_VADDR
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
},
};
return &execmem_info;
}
#endif
static void apply_r_mips_32(u32 *location, u32 base, Elf_Addr v)
{
*location = base + v;

23
arch/mips/mm/init.c
View File

@ -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>
@ -576,3 +577,25 @@ EXPORT_SYMBOL_GPL(invalid_pmd_table);
#endif
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
EXPORT_SYMBOL(invalid_pte_table);
#ifdef CONFIG_EXECMEM
#ifdef MODULES_VADDR
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
},
};
return &execmem_info;
}
#endif
#endif /* CONFIG_EXECMEM */

20
arch/nios2/kernel/module.c
View File

@ -13,33 +13,13 @@
#include <linux/moduleloader.h>
#include <linux/elf.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/execmem.h>
#include <asm/cacheflush.h>
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL_EXEC,
.alignment = 1,
},
},
};
return &execmem_info;
}
int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
unsigned int symindex, unsigned int relsec,
struct module *mod)

21
arch/nios2/mm/init.c
View File

@ -26,6 +26,7 @@
#include <linux/memblock.h>
#include <linux/slab.h>
#include <linux/binfmts.h>
#include <linux/execmem.h>
#include <asm/setup.h>
#include <asm/page.h>
@ -143,3 +144,23 @@ static const pgprot_t protection_map[16] = {
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = MKP(1, 1, 1)
};
DECLARE_VM_GET_PAGE_PROT
#ifdef CONFIG_EXECMEM
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL_EXEC,
.alignment = 1,
},
},
};
return &execmem_info;
}
#endif /* CONFIG_EXECMEM */

20
arch/parisc/kernel/module.c
View File

@ -41,7 +41,6 @@
#include <linux/moduleloader.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/ftrace.h>
#include <linux/string.h>
@ -49,7 +48,6 @@
#include <linux/bug.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/execmem.h>
#include <asm/unwind.h>
#include <asm/sections.h>
@ -174,24 +172,6 @@ static inline int reassemble_22(int as22)
((as22 & 0x0003ff) << 3));
}
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = PAGE_KERNEL_RWX,
.alignment = 1,
},
},
};
return &execmem_info;
}
#ifndef CONFIG_64BIT
static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
{

23
arch/parisc/mm/init.c
View File

@ -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>
@ -481,7 +482,7 @@ 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 */
@ -992,3 +993,23 @@ 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_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = PAGE_KERNEL_RWX,
.alignment = 1,
},
},
};
return &execmem_info;
}
#endif /* CONFIG_EXECMEM */

63
arch/powerpc/kernel/module.c
View File

@ -7,10 +7,8 @@
#include <linux/elf.h>
#include <linux/moduleloader.h>
#include <linux/err.h>
#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>
@ -89,64 +87,3 @@ int module_finalize(const Elf_Ehdr *hdr,
return 0;
}
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
pgprot_t kprobes_prot = strict_module_rwx_enabled() ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC;
unsigned long fallback_start = 0, fallback_end = 0;
unsigned long start, end;
/*
* BOOK3S_32 and 8xx define MODULES_VADDR for text allocations and
* allow allocating data in the entire vmalloc space
*/
#ifdef MODULES_VADDR
unsigned long limit = (unsigned long)_etext - SZ_32M;
BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
/* First try within 32M limit from _etext to avoid branch trampolines */
if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) {
start = limit;
fallback_start = MODULES_VADDR;
fallback_end = MODULES_END;
} else {
start = MODULES_VADDR;
}
end = MODULES_END;
#else
start = VMALLOC_START;
end = VMALLOC_END;
#endif
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = start,
.end = end,
.pgprot = prot,
.alignment = 1,
.fallback_start = fallback_start,
.fallback_end = fallback_end,
},
[EXECMEM_KPROBES] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = kprobes_prot,
.alignment = 1,
},
[EXECMEM_MODULE_DATA] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
},
};
return &execmem_info;
}

64
arch/powerpc/mm/mem.c
View File

@ -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 +407,66 @@ 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_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
pgprot_t kprobes_prot = strict_module_rwx_enabled() ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC;
unsigned long fallback_start = 0, fallback_end = 0;
unsigned long start, end;
/*
* BOOK3S_32 and 8xx define MODULES_VADDR for text allocations and
* allow allocating data in the entire vmalloc space
*/
#ifdef MODULES_VADDR
unsigned long limit = (unsigned long)_etext - SZ_32M;
BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
/* First try within 32M limit from _etext to avoid branch trampolines */
if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) {
start = limit;
fallback_start = MODULES_VADDR;
fallback_end = MODULES_END;
} else {
start = MODULES_VADDR;
}
end = MODULES_END;
#else
start = VMALLOC_START;
end = VMALLOC_END;
#endif
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = start,
.end = end,
.pgprot = prot,
.alignment = 1,
.fallback_start = fallback_start,
.fallback_end = fallback_end,
},
[EXECMEM_KPROBES] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = kprobes_prot,
.alignment = 1,
},
[EXECMEM_MODULE_DATA] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
},
};
return &execmem_info;
}
#endif /* CONFIG_EXECMEM */

34
arch/riscv/kernel/module.c
View File

@ -11,10 +11,8 @@
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/moduleloader.h>
#include <linux/vmalloc.h>
#include <linux/sizes.h>
#include <linux/pgtable.h>
#include <linux/execmem.h>
#include <asm/alternative.h>
#include <asm/sections.h>
@ -906,38 +904,6 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
return 0;
}
#ifdef CONFIG_MMU
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
[EXECMEM_KPROBES] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = PAGE_KERNEL_READ_EXEC,
.alignment = 1,
},
[EXECMEM_BPF] = {
.start = BPF_JIT_REGION_START,
.end = BPF_JIT_REGION_END,
.pgprot = PAGE_KERNEL,
.alignment = PAGE_SIZE,
},
},
};
return &execmem_info;
}
#endif
int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
struct module *me)

35
arch/riscv/mm/init.c
View File

@ -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>
@ -1481,3 +1482,37 @@ void __init pgtable_cache_init(void)
preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules");
}
#endif
#ifdef CONFIG_EXECMEM
#ifdef CONFIG_MMU
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
[EXECMEM_KPROBES] = {
.start = VMALLOC_START,
.end = VMALLOC_END,
.pgprot = PAGE_KERNEL_READ_EXEC,
.alignment = 1,
},
[EXECMEM_BPF] = {
.start = BPF_JIT_REGION_START,
.end = BPF_JIT_REGION_END,
.pgprot = PAGE_KERNEL,
.alignment = PAGE_SIZE,
},
},
};
return &execmem_info;
}
#endif /* CONFIG_MMU */
#endif /* CONFIG_EXECMEM */

27
arch/s390/kernel/module.c
View File

@ -37,33 +37,6 @@
#define PLT_ENTRY_SIZE 22
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(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_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.flags = EXECMEM_KASAN_SHADOW,
.start = start,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = MODULE_ALIGN,
},
},
};
return &execmem_info;
}
#ifdef CONFIG_FUNCTION_TRACER
void module_arch_cleanup(struct module *mod)
{

30
arch/s390/mm/init.c
View File

@ -49,6 +49,7 @@
#include <asm/uv.h>
#include <linux/virtio_anchor.h>
#include <linux/virtio_config.h>
#include <linux/execmem.h>
pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir");
pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir");
@ -302,3 +303,32 @@ void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
vmem_remove_mapping(start, size);
}
#endif /* CONFIG_MEMORY_HOTPLUG */
#ifdef CONFIG_EXECMEM
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(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_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.flags = EXECMEM_KASAN_SHADOW,
.start = start,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = MODULE_ALIGN,
},
},
};
return &execmem_info;
}
#endif /* CONFIG_EXECMEM */

19
arch/sparc/kernel/module.c
View File

@ -14,7 +14,6 @@
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/mm.h>
#include <linux/execmem.h>
#include <asm/processor.h>
#include <asm/spitfire.h>
@ -22,24 +21,6 @@
#include "entry.h"
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
},
};
return &execmem_info;
}
/* Make generic code ignore STT_REGISTER dummy undefined symbols. */
int module_frob_arch_sections(Elf_Ehdr *hdr,
Elf_Shdr *sechdrs,

2
arch/sparc/mm/Makefile
View File

@ -14,3 +14,5 @@ obj-$(CONFIG_SPARC32) += leon_mm.o
# Only used by sparc64
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_EXECMEM) += execmem.o

21
arch/sparc/mm/execmem.c Normal file
View File

@ -0,0 +1,21 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/mm.h>
#include <linux/execmem.h>
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.start = MODULES_VADDR,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = 1,
},
},
};
return &execmem_info;
}

27
arch/x86/kernel/module.c
View File

@ -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_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
unsigned long start, offset = 0;
if (kaslr_enabled())
offset = get_random_u32_inclusive(1, 1024) * PAGE_SIZE;
start = MODULES_VADDR + offset;
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.flags = EXECMEM_KASAN_SHADOW,
.start = start,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = MODULE_ALIGN,
},
},
};
return &execmem_info;
}
#ifdef CONFIG_X86_32
int apply_relocate(Elf32_Shdr *sechdrs,
const char *strtab,

29
arch/x86/mm/init.c
View File

@ -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>
@ -1095,3 +1096,31 @@ unsigned long arch_max_swapfile_size(void)
return pages;
}
#endif
#ifdef CONFIG_EXECMEM
static struct execmem_info execmem_info __ro_after_init;
struct execmem_info __init *execmem_arch_setup(void)
{
unsigned long start, offset = 0;
if (kaslr_enabled())
offset = get_random_u32_inclusive(1, 1024) * PAGE_SIZE;
start = MODULES_VADDR + offset;
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {
.flags = EXECMEM_KASAN_SHADOW,
.start = start,
.end = MODULES_END,
.pgprot = PAGE_KERNEL,
.alignment = MODULE_ALIGN,
},
},
};
return &execmem_info;
}
#endif /* CONFIG_EXECMEM */