Message ID | 20191220184955.223741-28-glider@google.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <SRS0=GDT+=2K=kvack.org=owner-linux-mm@kernel.org> Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9D87F139A for <patchwork-linux-mm@patchwork.kernel.org>; Fri, 20 Dec 2019 18:51:30 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6AA02206D8 for <patchwork-linux-mm@patchwork.kernel.org>; Fri, 20 Dec 2019 18:51:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="WqjxyhOk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6AA02206D8 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 561F88E01BE; Fri, 20 Dec 2019 13:51:29 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 538A58E019D; 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Fri, 20 Dec 2019 10:51:26 -0800 (PST) Date: Fri, 20 Dec 2019 19:49:40 +0100 In-Reply-To: <20191220184955.223741-1-glider@google.com> Message-Id: <20191220184955.223741-28-glider@google.com> Mime-Version: 1.0 References: <20191220184955.223741-1-glider@google.com> X-Mailer: git-send-email 2.24.1.735.g03f4e72817-goog Subject: [PATCH RFC v4 27/42] kmsan: printk: treat the result of vscnprintf() as initialized From: glider@google.com To: Andrew Morton <akpm@linux-foundation.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Eric Dumazet <edumazet@google.com>, Wolfram Sang <wsa@the-dreams.de>, Petr Mladek <pmladek@suse.com>, Vegard Nossum <vegard.nossum@oracle.com>, Dmitry Vyukov <dvyukov@google.com>, Marco Elver <elver@google.com>, Andrey Konovalov <andreyknvl@google.com>, linux-mm@kvack.org Cc: glider@google.com, viro@zeniv.linux.org.uk, adilger.kernel@dilger.ca, aryabinin@virtuozzo.com, luto@kernel.org, ard.biesheuvel@linaro.org, arnd@arndb.de, hch@infradead.org, hch@lst.de, darrick.wong@oracle.com, davem@davemloft.net, dmitry.torokhov@gmail.com, ebiggers@google.com, ericvh@gmail.com, harry.wentland@amd.com, herbert@gondor.apana.org.au, iii@linux.ibm.com, mingo@elte.hu, jasowang@redhat.com, axboe@kernel.dk, m.szyprowski@samsung.com, mark.rutland@arm.com, martin.petersen@oracle.com, schwidefsky@de.ibm.com, willy@infradead.org, mst@redhat.com, mhocko@suse.com, monstr@monstr.eu, cai@lca.pw, rdunlap@infradead.org, robin.murphy@arm.com, sergey.senozhatsky@gmail.com, rostedt@goodmis.org, tiwai@suse.com, tytso@mit.edu, tglx@linutronix.de, gor@linux.ibm.com Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> |
Series |
Add KernelMemorySanitizer infrastructure
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expand
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diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 1ef6f75d92f1..cda33cfabafa 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -1915,6 +1915,12 @@ int vprintk_store(int facility, int level, * prefix which might be passed-in as a parameter. */ text_len = vscnprintf(text, sizeof(textbuf), fmt, args); + /* + * If any of vscnprintf() arguments is uninitialized, KMSAN will report + * one or more errors and also probably mark text_len as uninitialized. + * Initialize |text_len| to prevent the errors from spreading further. + */ + text_len = KMSAN_INIT_VALUE(text_len); /* mark and strip a trailing newline */ if (text_len && text[text_len-1] == '\n') {