Messages in this thread Patch in this message | | | Date | Mon, 6 Jul 2015 08:37:04 -0700 | From | tip-bot for Andrey Ryabinin <> | Subject | [tip:x86/urgent] x86/kasan: Flush TLBs after switching CR3 |
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Commit-ID: 241d2c54c62fa0939fc9a9512b48ac3434e90a89 Gitweb: http://git.kernel.org/tip/241d2c54c62fa0939fc9a9512b48ac3434e90a89 Author: Andrey Ryabinin <a.ryabinin@samsung.com> AuthorDate: Thu, 2 Jul 2015 12:09:35 +0300 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Mon, 6 Jul 2015 14:53:14 +0200
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> --- 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; }
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