Messages in this thread Patch in this message | | | From | Andrey Ryabinin <> | Subject | [PATCH 2/5] x86_64: kasan: flush tlbs after switching cr3 | Date | Tue, 30 Jun 2015 12:00:08 +0300 |
| |
load_cr3() doesn't cause tlb_flush if PGE enabled. This may cause tons of false positive reports spamming kernel to death. To fix this __flush_tlb_all() should be called explicitly after cr3 changed.
Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com> Cc: <stable@vger.kernel.org> # 4.0 --- arch/x86/mm/kasan_init_64.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c index 0e4a05f..5d26642 100644 --- a/arch/x86/mm/kasan_init_64.c +++ b/arch/x86/mm/kasan_init_64.c @@ -208,6 +208,7 @@ void __init kasan_init(void) memcpy(early_level4_pgt, init_level4_pgt, sizeof(early_level4_pgt)); load_cr3(early_level4_pgt); + __flush_tlb_all(); clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END); @@ -234,5 +235,6 @@ void __init kasan_init(void) memset(kasan_zero_page, 0, PAGE_SIZE); load_cr3(init_level4_pgt); + __flush_tlb_all(); init_task.kasan_depth = 0; } -- 2.4.4
| |