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| author | Andrey Ryabinin <a.ryabinin@samsung.com> | 2015-07-02 12:09:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-10 12:21:52 -0700 |
| commit | bcb87bb5a5c1f990e584c6003e50869087bc2646 (patch) | |
| tree | b3d5a8c4cc840db48139fe2a3e41511aaf73f7fd /arch | |
| parent | 2fe36f4f2f2ae489cb7ab431b9a35947d426bbbb (diff) | |
| download | linux-stable-bcb87bb5a5c1f990e584c6003e50869087bc2646.tar.gz linux-stable-bcb87bb5a5c1f990e584c6003e50869087bc2646.tar.bz2 linux-stable-bcb87bb5a5c1f990e584c6003e50869087bc2646.zip | |
x86/kasan: Flush TLBs after switching CR3
commit 241d2c54c62fa0939fc9a9512b48ac3434e90a89 upstream.
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: 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -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; } |