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authorAndrey Ryabinin <a.ryabinin@samsung.com>2015-07-02 12:09:35 +0300
committerIngo Molnar <mingo@kernel.org>2015-07-06 14:53:14 +0200
commit241d2c54c62fa0939fc9a9512b48ac3434e90a89 (patch)
tree3860303ff60c73f7acb1bc930b9f66d56995b223 /arch/x86
parent5d5aa3cfca5cf74cd928daf3674642e6004328d1 (diff)
x86/kasan: Flush TLBs after switching CR3
load_cr3() doesn't cause tlb_flush if PGE enabled. This may cause tons of false positive reports spamming the 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+ Cc: Alexander Popov <alpopov@ptsecurity.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <adech.fo@gmail.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1435828178-10975-4-git-send-email-a.ryabinin@samsung.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/mm/kasan_init_64.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 0e4a05fa34d7..5d26642e4e8a 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;
}