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=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 AE459C433E0 for ; Tue, 16 Mar 2021 10:19:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8883564FF4 for ; Tue, 16 Mar 2021 10:19:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236628AbhCPKSh (ORCPT ); Tue, 16 Mar 2021 06:18:37 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:53739 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236411AbhCPKSS (ORCPT ); Tue, 16 Mar 2021 06:18:18 -0400 Received: by mail-io1-f69.google.com with SMTP id r10so22839342iod.20 for ; Tue, 16 Mar 2021 03:18:18 -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=BoEvcZGBDH2kT4i9Bl5G2G/txuwNInAz84VzIgpeD4U=; b=fWnF8VqrrOOtd18i2DBZbiuFiozpVkwrRbZmBOuHMgbyaft3yugeIb4/0qbD1A7bHV HRUWS44+Uk0A4e61l1Iy1I8UhNR2le1U8yj3ulUtCqHJzKl6juFHgciLak4ngALfX2yL TUDkZu4poNXOFqptV9KxVX2PfMAOlqx4J4Bg+q3HtGTLby41qYw8zb7ppWa+DsW63dOG 7DBLA4RQU/cfLYzgj6OqbYoVgq7fJVMae0nfmLqjuCCO2MlVTMpvbjI4S0eV3p1g59+6 PzqHa/aqb6joj7n13z+aAE+hzwDScVV53nlhnISKuQfO/LWRxYbii7BFKaE8G8k829AP 8bvA== X-Gm-Message-State: AOAM532r8I6R584XQGyUaz0IOYnG5fwl/OYRxu4t8IoPKne5szjHe67o LLO3Cwl/8Z8nB+zThxDColHO39DVZI8fKLIyhGm8LBLATe8y X-Google-Smtp-Source: ABdhPJxJrX0QNM+dGP5aboGB+Zxt+rD66/9Py5gSu6IfJdODdVEn/A5pYxo4Y3AEAWATNAV7DyePpP06J/4DAF7n+pefoUk/GiVd MIME-Version: 1.0 X-Received: by 2002:a05:6602:722:: with SMTP id g2mr2745168iox.1.1615889897802; Tue, 16 Mar 2021 03:18:17 -0700 (PDT) Date: Tue, 16 Mar 2021 03:18:17 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005ace4405bda4af71@google.com> Subject: [syzbot] KMSAN: uninit-value in video_usercopy (2) From: syzbot To: arnd@arndb.de, 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, sergey.senozhatsky@gmail.com, syzkaller-bugs@googlegroups.com, yepeilin.cs@gmail.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 29ad81a1 arch/x86: add missing include to sparsemem.h git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=102502dcd00000 kernel config: https://syzkaller.appspot.com/x/.config?x=8b976581f6bd1e7d dashboard link: https://syzkaller.appspot.com/bug?extid=142888ffec98ab194028 compiler: Debian clang version 11.0.1-2 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+142888ffec98ab194028@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in check_array_args drivers/media/v4l2-core/v4l2-ioctl.c:3041 [inline] BUG: KMSAN: uninit-value in video_usercopy+0x1631/0x3d30 drivers/media/v4l2-core/v4l2-ioctl.c:3315 CPU: 0 PID: 19595 Comm: syz-executor.4 Not tainted 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 check_array_args drivers/media/v4l2-core/v4l2-ioctl.c:3041 [inline] video_usercopy+0x1631/0x3d30 drivers/media/v4l2-core/v4l2-ioctl.c:3315 video_ioctl2+0x9f/0xb0 drivers/media/v4l2-core/v4l2-ioctl.c:3391 v4l2_ioctl+0x255/0x290 drivers/media/v4l2-core/v4l2-dev.c:360 v4l2_compat_ioctl32+0x2c6/0x370 drivers/media/v4l2-core/v4l2-compat-ioctl32.c:1248 __do_compat_sys_ioctl fs/ioctl.c:842 [inline] __se_compat_sys_ioctl+0x53d/0x1100 fs/ioctl.c:793 __ia32_compat_sys_ioctl+0x4a/0x70 fs/ioctl.c:793 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline] __do_fast_syscall_32+0x102/0x160 arch/x86/entry/common.c:141 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:166 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:209 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fec549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f55e65fc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000c050565d RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Local variable ----sbuf@video_usercopy created at: video_usercopy+0xaa/0x3d30 drivers/media/v4l2-core/v4l2-ioctl.c:3285 video_usercopy+0xaa/0x3d30 drivers/media/v4l2-core/v4l2-ioctl.c:3285 ===================================================== ===================================================== BUG: KMSAN: uninit-value in check_fmt+0x864/0x1070 drivers/media/v4l2-core/v4l2-ioctl.c:963 CPU: 0 PID: 19595 Comm: syz-executor.4 Tainted: G B 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 check_fmt+0x864/0x1070 drivers/media/v4l2-core/v4l2-ioctl.c:963 v4l_prepare_buf+0xbf/0x1d0 drivers/media/v4l2-core/v4l2-ioctl.c:2107 __video_do_ioctl+0x15cd/0x1d20 drivers/media/v4l2-core/v4l2-ioctl.c:2993 video_usercopy+0x2313/0x3d30 drivers/media/v4l2-core/v4l2-ioctl.c:3345 video_ioctl2+0x9f/0xb0 drivers/media/v4l2-core/v4l2-ioctl.c:3391 v4l2_ioctl+0x255/0x290 drivers/media/v4l2-core/v4l2-dev.c:360 v4l2_compat_ioctl32+0x2c6/0x370 drivers/media/v4l2-core/v4l2-compat-ioctl32.c:1248 __do_compat_sys_ioctl fs/ioctl.c:842 [inline] __se_compat_sys_ioctl+0x53d/0x1100 fs/ioctl.c:793 __ia32_compat_sys_ioctl+0x4a/0x70 fs/ioctl.c:793 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline] __do_fast_syscall_32+0x102/0x160 arch/x86/entry/common.c:141 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:166 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:209 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fec549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f55e65fc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000c050565d RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Local variable ----sbuf@video_usercopy created at: video_usercopy+0xaa/0x3d30 drivers/media/v4l2-core/v4l2-ioctl.c:3285 video_usercopy+0xaa/0x3d30 drivers/media/v4l2-core/v4l2-ioctl.c:3285 ===================================================== --- 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.