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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 A0C9BC10DCE for ; Thu, 12 Mar 2020 21:47:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7EB0320674 for ; Thu, 12 Mar 2020 21:47:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726669AbgCLVrP (ORCPT ); Thu, 12 Mar 2020 17:47:15 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:54648 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726481AbgCLVrP (ORCPT ); Thu, 12 Mar 2020 17:47:15 -0400 Received: by mail-io1-f70.google.com with SMTP id r8so4929548ioj.21 for ; Thu, 12 Mar 2020 14:47:12 -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=RHtneNZtey88S86E96ZMBHzZqJ04cKFcU/exnbgNbj0=; b=eQfNVuYUDUDrc+cpg90p7MttNXvN1ewDfvR3hDkHjiyBxH+CK7l1nDIE7ZPV0U9Vus WVPhVuo9ZtWC/e+oFtmffqO2rQ9VykiTZhYbJbLt855JakE3BgfET8MKMTuFQj/Rm10z +d9Z/qzVYAswqbEAZsVU7o55imuEJzY5x8lj0NWb7pask0ZLvV+yeuMYovVPHHU8SFTd EScobYqur+W5KKZuESsp9hLwCY5/gZZ+8xq3tKyliP8WZfhfeykfD0hscJDsS9+gnhMU jl3RJNKR3cVuCa8ywqZaFEaTwknKE+R8l6h59tVtdNfPiuNVCtdcg2p9EnBvCal9LfP4 KWeA== X-Gm-Message-State: ANhLgQ08rOaomFYYmJ9LKwm4HJXSKV8aAMtdzE9gwqxGST1XnAcnszw6 zNfV+zU5ppunIERJL3J23TdNcmrcHXxBnJXXwuEfRPtLGc4c X-Google-Smtp-Source: ADFU+vtNAsdEJDvFkjaw8aVDv5RzmoW8j/BlKR98t67Ky5vYATxmRKbTnCsVID5kEOVBaLwLwSuY/K1Eb6bdPvN2aplooJvHSXvo MIME-Version: 1.0 X-Received: by 2002:a92:5cd4:: with SMTP id d81mr10136452ilg.57.1584049632451; Thu, 12 Mar 2020 14:47:12 -0700 (PDT) Date: Thu, 12 Mar 2020 14:47:12 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a622f205a0af4b31@google.com> Subject: KMSAN: uninit-value in set_selection_kernel From: syzbot To: glider@google.com, gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org, okash.khawaja@gmail.com, samuel.thibault@ens-lyon.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 8bbbc5cf kmsan: don't compile memmove git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=1056f41de00000 kernel config: https://syzkaller.appspot.com/x/.config?x=cd0e9a6b0e555cc3 dashboard link: https://syzkaller.appspot.com/bug?extid=0b81ae727db96ee52ca8 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) userspace arch: i386 Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0b81ae727db96ee52ca8@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in store_utf8 drivers/tty/vt/selection.c:128 [inline] BUG: KMSAN: uninit-value in set_selection_kernel+0x2c0b/0x3400 drivers/tty/vt/selection.c:319 CPU: 1 PID: 12961 Comm: syz-executor.5 Not tainted 5.6.0-rc2-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+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 store_utf8 drivers/tty/vt/selection.c:128 [inline] set_selection_kernel+0x2c0b/0x3400 drivers/tty/vt/selection.c:319 set_selection_user+0x10a/0x150 drivers/tty/vt/selection.c:177 tioclinux+0x589/0xc40 drivers/tty/vt/vt.c:3039 vt_ioctl+0x1db1/0x5790 drivers/tty/vt/vt_ioctl.c:364 vt_compat_ioctl+0x6f3/0x10c0 drivers/tty/vt/vt_ioctl.c:1232 tty_compat_ioctl+0xa29/0x1850 drivers/tty/tty_io.c:2849 __do_compat_sys_ioctl fs/ioctl.c:857 [inline] __se_compat_sys_ioctl+0x57c/0xed0 fs/ioctl.c:808 __ia32_compat_sys_ioctl+0xd9/0x110 fs/ioctl.c:808 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline] do_fast_syscall_32+0x3c7/0x6e0 arch/x86/entry/common.c:410 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f85d99 Code: 90 e8 0b 00 00 00 f3 90 0f ae e8 eb f9 8d 74 26 00 89 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5d800cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000000541c 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 created at: kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:307 [inline] kmsan_alloc_page+0x12a/0x310 mm/kmsan/kmsan_shadow.c:336 __alloc_pages_nodemask+0x5712/0x5e80 mm/page_alloc.c:4775 alloc_pages_current+0x67d/0x990 mm/mempolicy.c:2211 alloc_pages include/linux/gfp.h:534 [inline] kmalloc_order mm/slab_common.c:1324 [inline] kmalloc_order_trace+0x8d/0x450 mm/slab_common.c:1340 kmalloc_large include/linux/slab.h:484 [inline] __kmalloc+0x305/0x450 mm/slub.c:3828 kmalloc include/linux/slab.h:560 [inline] vc_uniscr_alloc+0x95/0x730 drivers/tty/vt/vt.c:353 vc_do_resize+0x5e7/0x2bd0 drivers/tty/vt/vt.c:1192 vc_resize+0xc3/0xe0 drivers/tty/vt/vt.c:1304 vt_ioctl+0x5622/0x5790 drivers/tty/vt/vt_ioctl.c:887 vt_compat_ioctl+0x6f3/0x10c0 drivers/tty/vt/vt_ioctl.c:1232 tty_compat_ioctl+0xa29/0x1850 drivers/tty/tty_io.c:2849 __do_compat_sys_ioctl fs/ioctl.c:857 [inline] __se_compat_sys_ioctl+0x57c/0xed0 fs/ioctl.c:808 __ia32_compat_sys_ioctl+0xd9/0x110 fs/ioctl.c:808 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline] do_fast_syscall_32+0x3c7/0x6e0 arch/x86/entry/common.c:410 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139 ===================================================== --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.