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kasan, x86, arm64, s390: rename functions for modules shadow 

Rename kasan_free_shadow to kasan_free_module_shadow and
kasan_module_alloc to kasan_alloc_module_shadow.

These functions are used to allocate/free shadow memory for kernel modules
when KASAN_VMALLOC is not enabled.  The new names better reflect their
purpose.

Also reword the comment next to their declaration to improve clarity.

Link: https://lkml.kernel.org/r/36db32bde765d5d0b856f77d2d806e838513fe84.1643047180.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2022-03-24 18:10:52 -07:00 committed by Linus Torvalds
parent 00a756133b
commit 63840de296
6 changed files with 13 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm64/kernel/module.c
View File

@ -58,7 +58,7 @@ void *module_alloc(unsigned long size)
PAGE_KERNEL, 0, NUMA_NO_NODE,
__builtin_return_address(0));
if (p && (kasan_module_alloc(p, size, gfp_mask) < 0)) {
if (p && (kasan_alloc_module_shadow(p, size, gfp_mask) < 0)) {
vfree(p);
return NULL;
}

2
arch/s390/kernel/module.c
View File

@ -45,7 +45,7 @@ void *module_alloc(unsigned long size)
p = __vmalloc_node_range(size, MODULE_ALIGN, MODULES_VADDR, MODULES_END,
gfp_mask, PAGE_KERNEL_EXEC, VM_DEFER_KMEMLEAK, NUMA_NO_NODE,
__builtin_return_address(0));
if (p && (kasan_module_alloc(p, size, gfp_mask) < 0)) {
if (p && (kasan_alloc_module_shadow(p, size, gfp_mask) < 0)) {
vfree(p);
return NULL;
}

2
arch/x86/kernel/module.c
View File

@ -78,7 +78,7 @@ void *module_alloc(unsigned long size)
MODULES_END, gfp_mask,
PAGE_KERNEL, VM_DEFER_KMEMLEAK, NUMA_NO_NODE,
__builtin_return_address(0));
if (p && (kasan_module_alloc(p, size, gfp_mask) < 0)) {
if (p && (kasan_alloc_module_shadow(p, size, gfp_mask) < 0)) {
vfree(p);
return NULL;
}

14
include/linux/kasan.h
View File

@ -433,17 +433,17 @@ static inline void kasan_populate_early_vm_area_shadow(void *start,
!defined(CONFIG_KASAN_VMALLOC)
/*
* These functions provide a special case to support backing module
* allocations with real shadow memory. With KASAN vmalloc, the special
* case is unnecessary, as the work is handled in the generic case.
* These functions allocate and free shadow memory for kernel modules.
* They are only required when KASAN_VMALLOC is not supported, as otherwise
* shadow memory is allocated by the generic vmalloc handlers.
*/
int kasan_module_alloc(void *addr, size_t size, gfp_t gfp_mask);
void kasan_free_shadow(const struct vm_struct *vm);
int kasan_alloc_module_shadow(void *addr, size_t size, gfp_t gfp_mask);
void kasan_free_module_shadow(const struct vm_struct *vm);
#else /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
static inline int kasan_module_alloc(void *addr, size_t size, gfp_t gfp_mask) { return 0; }
static inline void kasan_free_shadow(const struct vm_struct *vm) {}
static inline int kasan_alloc_module_shadow(void *addr, size_t size, gfp_t gfp_mask) { return 0; }
static inline void kasan_free_module_shadow(const struct vm_struct *vm) {}
#endif /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */

4
mm/kasan/shadow.c
View File

@ -498,7 +498,7 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end,
#else /* CONFIG_KASAN_VMALLOC */
int kasan_module_alloc(void *addr, size_t size, gfp_t gfp_mask)
int kasan_alloc_module_shadow(void *addr, size_t size, gfp_t gfp_mask)
{
void *ret;
size_t scaled_size;
@ -534,7 +534,7 @@ int kasan_module_alloc(void *addr, size_t size, gfp_t gfp_mask)
return -ENOMEM;
}
void kasan_free_shadow(const struct vm_struct *vm)
void kasan_free_module_shadow(const struct vm_struct *vm)
{
if (vm->flags & VM_KASAN)
vfree(kasan_mem_to_shadow(vm->addr));

2
mm/vmalloc.c
View File

@ -2547,7 +2547,7 @@ struct vm_struct *remove_vm_area(const void *addr)
va->vm = NULL;
spin_unlock(&vmap_area_lock);
kasan_free_shadow(vm);
kasan_free_module_shadow(vm);
free_unmap_vmap_area(va);
return vm;