From patchwork Mon Jan 18 18:30:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincenzo Frascino X-Patchwork-Id: 12028001 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DA5C4C433E0 for ; Mon, 18 Jan 2021 18:32:39 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A147622CA1 for ; Mon, 18 Jan 2021 18:32:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A147622CA1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=5hN1cAYc1jteOaebQkryJsSq05ElUuldlAhdeAREJbM=; b=n4lhzBWgEaTzKJ5ZkmKcR97Dm eiglAj2wkZBEnxYBGtV0Q3WbkY0kF5Hskpe7BX0duXTkuJ4KyMzch4P2BGISnMteJMeGT0skhSHUw U6frcrofQokuO1MBUFnUOUL3HD03llHwSniv8R3PBUV7tjJ7TVRhisoyO7XE7ddYimdmW3gScOSf4 bWCyOhs6dtHZwQPEdOqQVnnT3lyNUPFR7YwzgRuBmKin046XyssdEYgZErgI6+AtjA94vubEa4x/R n7LsinAPalkV9ZYvLTdSMCBrbBi3TKU7RdbQx38glerFJFV6PE/Ma/cW2ek+HZIcg6eigvdY8UQCX ePqEwqoxg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l1ZIz-000133-3f; Mon, 18 Jan 2021 18:31:09 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l1ZIk-0000zR-65 for linux-arm-kernel@lists.infradead.org; Mon, 18 Jan 2021 18:30:55 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B3F6C101E; Mon, 18 Jan 2021 10:30:53 -0800 (PST) Received: from e119884-lin.cambridge.arm.com (e119884-lin.cambridge.arm.com [10.1.196.72]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 152DE3F719; Mon, 18 Jan 2021 10:30:51 -0800 (PST) From: Vincenzo Frascino To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Subject: [PATCH v4 3/5] kasan: Add report for async mode Date: Mon, 18 Jan 2021 18:30:31 +0000 Message-Id: <20210118183033.41764-4-vincenzo.frascino@arm.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210118183033.41764-1-vincenzo.frascino@arm.com> References: <20210118183033.41764-1-vincenzo.frascino@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210118_133054_313869_2A5AD543 X-CRM114-Status: GOOD ( 14.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Marco Elver , Catalin Marinas , Branislav Rankov , Alexander Potapenko , Evgenii Stepanov , Andrey Konovalov , Andrey Ryabinin , Vincenzo Frascino , Will Deacon , Dmitry Vyukov Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org KASAN provides an asynchronous mode of execution. Add reporting functionality for this mode. Cc: Dmitry Vyukov Cc: Andrey Ryabinin Cc: Alexander Potapenko Cc: Andrey Konovalov Signed-off-by: Vincenzo Frascino --- include/linux/kasan.h | 3 +++ mm/kasan/report.c | 16 ++++++++++++++-- 2 files changed, 17 insertions(+), 2 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index fe1ae73ff8b5..8f43836ccdac 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -336,6 +336,9 @@ static inline void *kasan_reset_tag(const void *addr) bool kasan_report(unsigned long addr, size_t size, bool is_write, unsigned long ip); +bool kasan_report_async(unsigned long addr, size_t size, + bool is_write, unsigned long ip); + #else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ static inline void *kasan_reset_tag(const void *addr) diff --git a/mm/kasan/report.c b/mm/kasan/report.c index c0fb21797550..946016ead6a9 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -388,11 +388,11 @@ static void __kasan_report(unsigned long addr, size_t size, bool is_write, start_report(&flags); print_error_description(&info); - if (addr_has_metadata(untagged_addr)) + if (addr_has_metadata(untagged_addr) && (untagged_addr != 0)) print_tags(get_tag(tagged_addr), info.first_bad_addr); pr_err("\n"); - if (addr_has_metadata(untagged_addr)) { + if (addr_has_metadata(untagged_addr) && (untagged_addr != 0)) { print_address_description(untagged_addr, get_tag(tagged_addr)); pr_err("\n"); print_memory_metadata(info.first_bad_addr); @@ -419,6 +419,18 @@ bool kasan_report(unsigned long addr, size_t size, bool is_write, return ret; } +bool kasan_report_async(unsigned long addr, size_t size, + bool is_write, unsigned long ip) +{ + pr_info("==================================================================\n"); + pr_info("KASAN: set in asynchronous mode\n"); + pr_info("KASAN: some information might not be accurate\n"); + pr_info("KASAN: fault address is ignored\n"); + pr_info("KASAN: write/read distinction is ignored\n"); + + return kasan_report(addr, size, is_write, ip); +} + #ifdef CONFIG_KASAN_INLINE /* * With CONFIG_KASAN_INLINE, accesses to bogus pointers (outside the high