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| author |   Andrey Ryabinin <a.ryabinin@samsung.com> | 2015-07-02 12:09:35 +0300 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2015-07-06 14:53:14 +0200 |
| commit | 241d2c54c62fa0939fc9a9512b48ac3434e90a89 (patch) | |
| tree | 3860303ff60c73f7acb1bc930b9f66d56995b223 /arch/x86 | |
| parent | x86/kasan: Fix KASAN shadow region page tables (diff) | |
| download | linux-dev-241d2c54c62fa0939fc9a9512b48ac3434e90a89.tar.xz linux-dev-241d2c54c62fa0939fc9a9512b48ac3434e90a89.zip | |
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.c | 2 |
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; } |