Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2993335AbbHHWNF (ORCPT ); Sat, 8 Aug 2015 18:13:05 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:36254 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992764AbbHHWMo (ORCPT ); Sat, 8 Aug 2015 18:12:44 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrey Ryabinin , Alexander Popov , Alexander Potapenko , Andrey Konovalov , Borislav Petkov , Dmitry Vyukov , Linus Torvalds , Peter Zijlstra , Thomas Gleixner , Ingo Molnar Subject: [PATCH 4.1 024/123] x86/kasan: Flush TLBs after switching CR3 Date: Sat, 8 Aug 2015 15:08:22 -0700 Message-Id: <20150808220718.741328379@linuxfoundation.org> X-Mailer: git-send-email 2.5.0 In-Reply-To: <20150808220717.771230091@linuxfoundation.org> References: <20150808220717.771230091@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1799 Lines: 57 4.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andrey Ryabinin 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 Cc: Alexander Popov Cc: Alexander Potapenko Cc: Andrey Konovalov Cc: Borislav Petkov Cc: Dmitry Vyukov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1435828178-10975-4-git-send-email-a.ryabinin@samsung.com Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman --- arch/x86/mm/kasan_init_64.c | 2 ++ 1 file changed, 2 insertions(+) --- 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; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/