From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 D842BC433E2 for ; Wed, 22 Jul 2020 05:53:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BB1BE207DD for ; Wed, 22 Jul 2020 05:53:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728321AbgGVFxU (ORCPT ); Wed, 22 Jul 2020 01:53:20 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:40155 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727993AbgGVFxU (ORCPT ); Wed, 22 Jul 2020 01:53:20 -0400 Received: by mail-io1-f70.google.com with SMTP id f25so1128343ioh.7 for ; Tue, 21 Jul 2020 22:53:19 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=9IgRu2uMesy4c9c+gNLBJYsfcIEEN+7tndJeF0Yh/Zg=; b=eyqTf/xmy3zBRlSZ06H2egX0NQ5MHr3ikjJDu+QdkMi90aCmdqAdK6pSVz0tVdZcbC 6uwqE8Ut6aVHXu/gqJkXROl30Njqs3wxLPseRPgEoqgm+UOC7Yrgl2CSrokQCLQJrZsx QStBPUS3oV74l/2xQNkdmMNim3OkmL8sAWncHbNWiUSmSc0lGXcHT+bC0hDOxOrQuBcA W9RdNiKl4WYCnS0N+w5Yx7G998yBe8OReak7/4LErcyqJiqXxxzy4MaZ169qRl3Ur7yI i55eFDH+WuYRpug9hH4OUVQg+nWB4nMrA7uNP/5JM4TXlZGPay+zeWgEsGwe9PphzvG6 DK3A== X-Gm-Message-State: AOAM533GJJTPd6NKKH6/P7bMsenhMyBcLGWs+KYN90b9IAKDLHEucQEz fAgkgmdSibWASR3zbCVdb+ux2ofQZFTX5iQYXxqICDy8SrQn X-Google-Smtp-Source: ABdhPJx4ETI+hJ9B7DaNY0pHG6EuDb/SP4iQAglQKZ41CgdONAdLTa4V/NlhyPKE6bCDgRmyUE6PaBJXgMuva1uC/npo5rNPbGz+ MIME-Version: 1.0 X-Received: by 2002:a05:6e02:4ca:: with SMTP id f10mr31722621ils.291.1595397199398; Tue, 21 Jul 2020 22:53:19 -0700 (PDT) Date: Tue, 21 Jul 2020 22:53:19 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000588d8b05ab015bed@google.com> Subject: KMSAN: uninit-value in video_usercopy From: syzbot To: arnd@arndb.de, bnvandana@gmail.com, glider@google.com, hverkuil-cisco@xs4all.nl, laurent.pinchart@ideasonboard.com, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org, niklas.soderlund+renesas@ragnatech.se, sakari.ailus@linux.intel.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 14525656 compiler.h: reinstate missing KMSAN_INIT git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=15be8380900000 kernel config: https://syzkaller.appspot.com/x/.config?x=c534a9fad6323722 dashboard link: https://syzkaller.appspot.com/bug?extid=79d751604cb6f29fbf59 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17eb93d0900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116da33b100000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+79d751604cb6f29fbf59@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in kmsan_check_memory+0xd/0x10 mm/kmsan/kmsan_hooks.c:428 CPU: 0 PID: 8471 Comm: syz-executor794 Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1df/0x240 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 kmsan_internal_check_memory+0x238/0x3d0 mm/kmsan/kmsan.c:423 kmsan_check_memory+0xd/0x10 mm/kmsan/kmsan_hooks.c:428 instrument_copy_to_user include/linux/instrumented.h:91 [inline] _copy_to_user+0x100/0x1d0 lib/usercopy.c:30 copy_to_user include/linux/uaccess.h:161 [inline] video_put_user drivers/media/v4l2-core/v4l2-ioctl.c:3226 [inline] video_usercopy+0x248a/0x2c00 drivers/media/v4l2-core/v4l2-ioctl.c:3325 video_ioctl2+0x9f/0xb0 drivers/media/v4l2-core/v4l2-ioctl.c:3335 v4l2_ioctl+0x23f/0x270 drivers/media/v4l2-core/v4l2-dev.c:360 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl fs/ioctl.c:753 [inline] __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl+0x2e9/0x410 fs/ioctl.c:760 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:760 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x444009 Code: Bad RIP value. RSP: 002b:00007ffd83706aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444009 RDX: 0000000020000100 RSI: 00000000c0505611 RDI: 0000000000000003 RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401c90 R13: 0000000000401d20 R14: 0000000000000000 R15: 0000000000000000 Local variable ----vb32.i@video_usercopy created at: video_put_user drivers/media/v4l2-core/v4l2-ioctl.c:3210 [inline] video_usercopy+0x20bd/0x2c00 drivers/media/v4l2-core/v4l2-ioctl.c:3325 video_put_user drivers/media/v4l2-core/v4l2-ioctl.c:3210 [inline] video_usercopy+0x20bd/0x2c00 drivers/media/v4l2-core/v4l2-ioctl.c:3325 Bytes 52-55 of 80 are uninitialized Memory access of size 80 starts at ffffa41d80dcfce0 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches