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=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 97B93C433DB for ; Mon, 22 Feb 2021 09:17:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 45E1564E41 for ; Mon, 22 Feb 2021 09:17:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230210AbhBVJR3 (ORCPT ); Mon, 22 Feb 2021 04:17:29 -0500 Received: from mail-il1-f199.google.com ([209.85.166.199]:35544 "EHLO mail-il1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230131AbhBVJP5 (ORCPT ); Mon, 22 Feb 2021 04:15:57 -0500 Received: by mail-il1-f199.google.com with SMTP id i7so7220475ilu.2 for ; Mon, 22 Feb 2021 01:15:39 -0800 (PST) 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=OEjUdAntmh0cV69BmZZEmoUlVVj/CIh6n7qrYCRIkK8=; b=qT1nMEKZMSUCNZDoj+zi6YZ8V7ySSPuNZdr59ze/wFe60HXMTLDC4j5iFtuEdIMz9y OC9ZfuTmlMXA49o3vHq+pO9vaHANgSKSB9/lFG/naQPHppgTuR2NenTXjQn9+IpEbj0j QLr2X4WsvlPpBwMBTrKJnLROTkXafFWRxPIbXKOo82BCa0uLNsTprHOpME90uT37bIIO c025JIm+HhOiTuGkQfJHOWFGOGVtyv9XrNk2/EByD2duWnrcTt6LESwRjLo55rqL6Lj3 fycsiX9rgyNNekY1e2A6XHp4vj4zwum4YhmzDA+Z8XlMagpqAqoizKVs5SCrzbxf/Ydc 4cTA== X-Gm-Message-State: AOAM533JjjLZBwVzdUaUQCYZ2WEFBkgGx9meiOqpNB9ftky/PJ57zFnO mdtzGH+zyEUcecXzVbZjX3RTQfg0Pw8aMQcYDTm0kgb296oj X-Google-Smtp-Source: ABdhPJxZJaKpP8tyaybDaDJn5xSuedJMPndywknS7IfdSwqObQsk56zdpme9j16Z8mZeWv9AwiK4Xea4DW/KTvNXxPYEmbktDv2r MIME-Version: 1.0 X-Received: by 2002:a92:ab10:: with SMTP id v16mr14643708ilh.100.1613985314424; Mon, 22 Feb 2021 01:15:14 -0800 (PST) Date: Mon, 22 Feb 2021 01:15:14 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000056cda705bbe93d11@google.com> Subject: KMSAN: kernel-infoleak in compat_drm_wait_vblank From: syzbot To: airlied@linux.ie, daniel@ffwll.ch, dri-devel@lists.freedesktop.org, glider@google.com, linux-kernel@vger.kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, syzkaller-bugs@googlegroups.com, tzimmermann@suse.de 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=111e6312d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=c8e3b38ca92283e dashboard link: https://syzkaller.appspot.com/bug?extid=620cf21140fc7e772a5d 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+620cf21140fc7e772a5d@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:249 CPU: 1 PID: 26999 Comm: syz-executor.2 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 kmsan_internal_check_memory+0x484/0x520 mm/kmsan/kmsan.c:437 kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:249 instrument_copy_to_user include/linux/instrumented.h:121 [inline] _copy_to_user+0x1ac/0x270 lib/usercopy.c:33 copy_to_user include/linux/uaccess.h:209 [inline] compat_drm_wait_vblank+0x36f/0x450 drivers/gpu/drm/drm_ioc32.c:866 drm_compat_ioctl+0x3f6/0x590 drivers/gpu/drm/drm_ioc32.c:995 __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: 0023:0xf7f47549 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:00000000f55415fc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000c018643a RDX: 0000000020000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289 __msan_chain_origin+0x57/0xa0 mm/kmsan/kmsan_instr.c:147 compat_drm_wait_vblank+0x43c/0x450 drivers/gpu/drm/drm_ioc32.c:865 drm_compat_ioctl+0x3f6/0x590 drivers/gpu/drm/drm_ioc32.c:995 __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 Local variable ----req@compat_drm_wait_vblank created at: compat_drm_wait_vblank+0x7b/0x450 drivers/gpu/drm/drm_ioc32.c:849 compat_drm_wait_vblank+0x7b/0x450 drivers/gpu/drm/drm_ioc32.c:849 Bytes 12-15 of 16 are uninitialized Memory access of size 16 starts at ffff88814ffe3c98 Data copied to user address 0000000020000100 ===================================================== --- This report is generated by a bot. 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