From: Andrey Ryabinin <a.ryabi...@samsung.com> 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.ryabi...@samsung.com> Cc: <sta...@vger.kernel.org> # 4.0+ Cc: Alexander Popov <alpo...@ptsecurity.com> Cc: Alexander Potapenko <gli...@google.com> Cc: Andrey Konovalov <adech...@gmail.com> Cc: Borislav Petkov <b...@alien8.de> Cc: Dmitry Vyukov <dvyu...@google.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Link: http://lkml.kernel.org/r/1435828178-10975-4-git-send-email-a.ryabi...@samsung.com Signed-off-by: Ingo Molnar <mi...@kernel.org> Signed-off-by: Andrey Ryabinin <aryabi...@odin.com> --- 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 ad0b931..0ada6cc 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; } -- 2.4.6 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
