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mm/kasan: Kasan global support setting alignment length

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1. Similar to asan, supports single byte out of bounds detection
2. Fix the script to address the issue of not supporting the big end

Signed-off-by: wangmingrong1 <wangmingrong1@xiaomi.com>
This commit is contained in:
wangmingrong1
2024-09-20 10:53:23 +08:00
committed by Xiang Xiao
parent 0d8b6de03a
commit 469418f3c9
7 changed files with 73 additions and 34 deletions
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mm/Kconfig
+8
View File
@@ -341,6 +341,14 @@ config MM_KASAN_GLOBAL
KEEP ( *(. data. rel. local.. LASAN0))
}", used to extract data generated by the compiler
if MM_KASAN_GLOBAL
config MM_KASAN_GLOBAL_ALIGN
int "KASan global alignment"
default 32
endif # MM_KASAN_GLOBAL
config MM_KASAN_DISABLE_READ_PANIC
bool "Disable panic on kasan read error"
default n
mm/kasan/global.c
+4 -6
View File
@@ -40,8 +40,6 @@
#define KASAN_GLOBAL_LAST_WORD_MASK(end) \
(UINTPTR_MAX >> (-(end) & (KASAN_BITS_PER_WORD - 1)))
#define KASAN_GLOBAL_SHADOW_SCALE (32)
/****************************************************************************
* Private Types
****************************************************************************/
@@ -77,7 +75,7 @@ kasan_global_mem_to_shadow(FAR const void *ptr, size_t size,
{
DEBUGASSERT(addr + size <= g_global_region[i]->end);
addr -= g_global_region[i]->begin;
addr /= KASAN_GLOBAL_SHADOW_SCALE;
addr /= CONFIG_MM_KASAN_GLOBAL_ALIGN;
*bit = addr % KASAN_BITS_PER_WORD;
return (FAR uintptr_t *)
&g_global_region[i]->shadow[addr / KASAN_BITS_PER_WORD];
@@ -101,15 +99,15 @@ kasan_global_is_poisoned(FAR const void *addr, size_t size)
return false;
}
if (size <= KASAN_GLOBAL_SHADOW_SCALE)
if (size <= CONFIG_MM_KASAN_GLOBAL_ALIGN)
{
return ((*p >> bit) & 1);
}
nbit = KASAN_BITS_PER_WORD - bit % KASAN_BITS_PER_WORD;
mask = KASAN_GLOBAL_FIRST_WORD_MASK(bit);
size = ALIGN_UP(size, KASAN_GLOBAL_SHADOW_SCALE);
size /= KASAN_GLOBAL_SHADOW_SCALE;
size = ALIGN_UP(size, CONFIG_MM_KASAN_GLOBAL_ALIGN);
size /= CONFIG_MM_KASAN_GLOBAL_ALIGN;
while (size >= nbit)
{