diff options
| -rw-r--r-- | include/linux/kasan.h | 16 | ||||
| -rw-r--r-- | mm/kasan/shadow.c | 6 | ||||
| -rw-r--r-- | mm/vmalloc.c | 14 |
3 files changed, 22 insertions, 14 deletions
diff --git a/include/linux/kasan.h b/include/linux/kasan.h index a6d6fdefb278..d3efb6cbd0f5 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -403,12 +403,13 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end, unsigned long free_region_start, unsigned long free_region_end); -void __kasan_unpoison_vmalloc(const void *start, unsigned long size); -static __always_inline void kasan_unpoison_vmalloc(const void *start, - unsigned long size) +void *__kasan_unpoison_vmalloc(const void *start, unsigned long size); +static __always_inline void *kasan_unpoison_vmalloc(const void *start, + unsigned long size) { if (kasan_enabled()) - __kasan_unpoison_vmalloc(start, size); + return __kasan_unpoison_vmalloc(start, size); + return (void *)start; } void __kasan_poison_vmalloc(const void *start, unsigned long size); @@ -433,8 +434,11 @@ static inline void kasan_release_vmalloc(unsigned long start, unsigned long free_region_start, unsigned long free_region_end) { } -static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size) -{ } +static inline void *kasan_unpoison_vmalloc(const void *start, + unsigned long size) +{ + return (void *)start; +} static inline void kasan_poison_vmalloc(const void *start, unsigned long size) { } diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c index 39d0b32ebf70..5a866f6663fc 100644 --- a/mm/kasan/shadow.c +++ b/mm/kasan/shadow.c @@ -475,12 +475,14 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end, } } -void __kasan_unpoison_vmalloc(const void *start, unsigned long size) +void *__kasan_unpoison_vmalloc(const void *start, unsigned long size) { if (!is_vmalloc_or_module_addr(start)) - return; + return (void *)start; + start = set_tag(start, kasan_random_tag()); kasan_unpoison(start, size, false); + return (void *)start; } /* diff --git a/mm/vmalloc.c b/mm/vmalloc.c index ab0a0002bfca..1ab1f1b2f5b7 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2231,7 +2231,7 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node) mem = (void *)addr; } - kasan_unpoison_vmalloc(mem, size); + mem = kasan_unpoison_vmalloc(mem, size); if (vmap_pages_range(addr, addr + size, PAGE_KERNEL, pages, PAGE_SHIFT) < 0) { @@ -2464,10 +2464,10 @@ static struct vm_struct *__get_vm_area_node(unsigned long size, return NULL; } - kasan_unpoison_vmalloc((void *)va->va_start, requested_size); - setup_vmalloc_vm(area, va, flags, caller); + area->addr = kasan_unpoison_vmalloc(area->addr, requested_size); + return area; } @@ -3815,9 +3815,6 @@ retry: for (area = 0; area < nr_vms; area++) { if (kasan_populate_vmalloc(vas[area]->va_start, sizes[area])) goto err_free_shadow; - - kasan_unpoison_vmalloc((void *)vas[area]->va_start, - sizes[area]); } /* insert all vm's */ @@ -3830,6 +3827,11 @@ retry: } spin_unlock(&vmap_area_lock); + /* mark allocated areas as accessible */ + for (area = 0; area < nr_vms; area++) + vms[area]->addr = kasan_unpoison_vmalloc(vms[area]->addr, + vms[area]->size); + kfree(vas); return vms; |