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_DIGITS, 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 78D06C433ED for ; Wed, 14 Apr 2021 05:52:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 54854608FC for ; Wed, 14 Apr 2021 05:52:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347873AbhDNFw4 (ORCPT ); Wed, 14 Apr 2021 01:52:56 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:48754 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347790AbhDNFwk (ORCPT ); Wed, 14 Apr 2021 01:52:40 -0400 Received: by mail-il1-f200.google.com with SMTP id w2-20020a92c8820000b0290154cfcf53e5so589966ilo.15 for ; Tue, 13 Apr 2021 22:52:20 -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=+m0E+t8NZADjC4EINZ+KB+2NMPsqESMoZ/gOC8zfLP4=; b=ZY4Xq+d+kLr6uk1/1NtdGUrF4i3PXe7K0d3WLw6NvJGusWmz3Q1IJPgTixCo5s1zkh CCo+ieilPI1g5G25W1wJkckr2IUXB+9EBer1i2jJvRXuKdgNaB0BfMj7pBXuXpk1+jN9 sCKuTM6wf3F+fygqupUvtUcD3Zd0tsULyYvpdABboj2xFd1yQJK9yTS+3s0Ie4XN8eSQ juHA0YhfMAbO3m263Eay7KqZ16b6ezO0yxyMcOaZRN8b1qfPJto1k6DAw9J7o3hyyPOp WoZlDksiL10LiBFYgz3Rd4pwyH37cm73Rzd+2R6TrfuVNffoT2L1/MOWdkAZooo9yMQ+ cdxg== X-Gm-Message-State: AOAM533U/FsR1Y7KgjWxzwh8blvYssKIVQzovBGcxhFBgY1VBgRVclcI YEsmm8KYIyoimqjyFKAcFIiTbUjV+TwcPGdsdVICJqv/nnCn X-Google-Smtp-Source: ABdhPJxhbk1xPLzGBuG8XeMEJVetZJW23+svXclqHEp0/RGeO8JYQM02hhRXPijmk6lEGf952Q2njMqLuqp6yGDHAB79j9D4ttPV MIME-Version: 1.0 X-Received: by 2002:a05:6602:1da:: with SMTP id w26mr30130358iot.170.1618379540028; Tue, 13 Apr 2021 22:52:20 -0700 (PDT) Date: Tue, 13 Apr 2021 22:52:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009862e005bfe859c8@google.com> Subject: [syzbot] KASAN: use-after-free Read in get_wchan From: syzbot To: 0x7f454c46@gmail.com, akpm@linux-foundation.org, aou@eecs.berkeley.edu, chenhuang5@huawei.com, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, palmer@dabbelt.com, paul.walmsley@sifive.com, syzkaller-bugs@googlegroups.com, wangkefeng.wang@huawei.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: b2b3d18f riscv: Make NUMA depend on MMU git tree: git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes console output: https://syzkaller.appspot.com/x/log.txt?x=12b59d16d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=81b3e7c68dad6e dashboard link: https://syzkaller.appspot.com/bug?extid=0806291048161061627c userspace arch: riscv64 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+0806291048161061627c@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in walk_stackframe arch/riscv/kernel/stacktrace.c:60 [inline] BUG: KASAN: use-after-free in get_wchan+0x156/0x196 arch/riscv/kernel/stacktrace.c:136 Read of size 8 at addr ffffffe0058e3d90 by task syz-executor.0/4667 CPU: 1 PID: 4667 Comm: syz-executor.0 Not tainted 5.12.0-rc5-syzkaller-00721-gb2b3d18fc20e #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] walk_stackframe+0x0/0x23c arch/riscv/kernel/traps.c:201 [] dump_backtrace+0x40/0x4e arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x22/0x2e arch/riscv/kernel/stacktrace.c:118 [] __dump_stack lib/dump_stack.c:79 [inline] [] dump_stack+0x148/0x1d8 lib/dump_stack.c:120 [] print_address_description.constprop.0+0x52/0x31e mm/kasan/report.c:232 [] __kasan_report mm/kasan/report.c:399 [inline] [] kasan_report+0x16e/0x18c mm/kasan/report.c:416 [] check_region_inline mm/kasan/generic.c:180 [inline] [] __asan_load8+0x6e/0x80 mm/kasan/generic.c:253 [] walk_stackframe arch/riscv/kernel/stacktrace.c:60 [inline] [] get_wchan+0x156/0x196 arch/riscv/kernel/stacktrace.c:136 [] proc_pid_wchan+0x48/0xa4 fs/proc/base.c:390 [] proc_single_show+0x9c/0x13c fs/proc/base.c:774 [] seq_read_iter+0x2e0/0x8f2 fs/seq_file.c:227 [] seq_read+0x200/0x298 fs/seq_file.c:159 [] vfs_read+0x108/0x2ac fs/read_write.c:494 [] ksys_read+0xb4/0x1b8 fs/read_write.c:634 [] __do_sys_read fs/read_write.c:644 [inline] [] sys_read+0x28/0x36 fs/read_write.c:642 [] ret_from_syscall+0x0/0x2 The buggy address belongs to the page: page:ffffffcf0216b8c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x85ae3 flags: 0xffe000000000000() raw: 0ffe000000000000 ffffffcf0216b8c8 ffffffcf0216b8c8 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffffffe0058e3c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffffffe0058e3d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffffffe0058e3d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffffffe0058e3e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffffffe0058e3e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== --- 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.