Ksawlii/kernel_samsung_a53x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Revert "mm: add support for verifying page sanitization"

Browse source 
This reverts commit 7617e31b3c.
This commit is contained in:
Ksawlii 2024-12-13 19:44:18 +01:00
parent e1a9aa973c
commit 297fe16eaf
3 changed files with 0 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
include/linux/highmem.h
View file

@ -282,13 +282,6 @@ static inline void tag_clear_highpage(struct page *page)
#endif #endif
static inline void verify_zero_highpage(struct page *page)
{
void *kaddr = kmap_atomic(page);
BUG_ON(memchr_inv(kaddr, 0, PAGE_SIZE));
kunmap_atomic(kaddr);
}
static inline void zero_user_segments(struct page *page, static inline void zero_user_segments(struct page *page,
unsigned start1, unsigned end1, unsigned start1, unsigned end1,
unsigned start2, unsigned end2) unsigned start2, unsigned end2)

6
mm/page_alloc.c
View file

@ -2391,12 +2391,6 @@ static void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags
{ {
post_alloc_hook(page, order, gfp_flags); post_alloc_hook(page, order, gfp_flags);
if (IS_ENABLED(CONFIG_PAGE_SANITIZE_VERIFY) && want_init_on_free()) {
int i;
for (i = 0; i < (1 << order); i++)
verify_zero_highpage(page + i);
}
if (order && (gfp_flags & __GFP_COMP)) if (order && (gfp_flags & __GFP_COMP))
prep_compound_page(page, order); prep_compound_page(page, order);

7
security/Kconfig.hardening
View file

@ -238,13 +238,6 @@ config INIT_ON_FREE_DEFAULT_ON
touching "cold" memory areas. Most cases see 3-5% impact. Some touching "cold" memory areas. Most cases see 3-5% impact. Some
synthetic workloads have measured as high as 8%. synthetic workloads have measured as high as 8%.
config PAGE_SANITIZE_VERIFY
bool "Verify sanitized pages"
default y
help
When init_on_free is enabled, verify that newly allocated pages
are zeroed to detect write-after-free bugs.
endmenu endmenu
endmenu endmenu