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=2.1 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SORTED_RECIPS,SPF_PASS, URIBL_BLOCKED autolearn=no 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 26322C6778A for ; Mon, 9 Jul 2018 05:52:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C1131208A3 for ; Mon, 9 Jul 2018 05:52:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C1131208A3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754564AbeGIFwE (ORCPT ); Mon, 9 Jul 2018 01:52:04 -0400 Received: from mail-it0-f71.google.com ([209.85.214.71]:52750 "EHLO mail-it0-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751132AbeGIFwC (ORCPT ); Mon, 9 Jul 2018 01:52:02 -0400 Received: by mail-it0-f71.google.com with SMTP id b132-v6so14869171iti.2 for ; Sun, 08 Jul 2018 22:52:02 -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=NK0eBQj0PzRReimKNUdZ1LmP7wU4iQJQ1gZ7JpB9DEU=; b=e+NpAoE9ahKw0Vb5vyIP4FPLqWBZZRHlFcxrbOI8Ct0HY1HFRGUzcCUGd6y4Vhk4zH eqDDQwS+LhHBAH/B3BXJCCQURHFueJWP7OFqg0Q4nJXneUo7WWxUc7wwEjmksEuto1Ij Ce3PWn4Mh0fSItxwnMw8rn4TkbGCAUFDQs8lO9NW4JWZTmVZmNEhx3bkyk6/QWV6U4in 3LNM8xLjyptmc2OWB/Pi8L3SCLm/DCiT/aLQZrFsJUVD9yEVBYxuNikmXVgr4uWsSXrp /PMw/kbKOBiFfXCxnqyIGdR9rtz3/ZnFAweMJGz5/SH2yrwFDg5+EsJZybC/ZDLwei+W RXzg== X-Gm-Message-State: APt69E3tJaziMg5h+HsHFV9Ru6W88yUEc6buLVi0Tj5xDtqYYCSWM6TR eMnZNmaGYGYTUjfZ7lYfgvqKexgK5OpFvX2GoyvTG4PKn9Kc X-Google-Smtp-Source: AAOMgpc1v+9gHzkcmBetYa+8YUdX1b8YsqkH8aQM0tNKDKwhmkKk3us1tW2WzKoTX5mlLYfN21dbvD9DXnb8lugKMUpvEO7g7mte MIME-Version: 1.0 X-Received: by 2002:a02:e88:: with SMTP id 130-v6mr6847065jae.0.1531115522019; Sun, 08 Jul 2018 22:52:02 -0700 (PDT) Date: Sun, 08 Jul 2018 22:52:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ccdf0605708a9ccc@google.com> Subject: KASAN: use-after-free Write in _free_event From: syzbot To: acme@kernel.org, alexander.shishkin@linux.intel.com, jolsa@redhat.com, linux-kernel@vger.kernel.org, mingo@redhat.com, namhyung@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes 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: b2d44d145d2a Merge tag '4.18-rc3-smb3fixes' of git://git.s.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=178cf50c400000 kernel config: https://syzkaller.appspot.com/x/.config?x=2ca6c7a31d407f86 dashboard link: https://syzkaller.appspot.com/bug?extid=a24c397a29ad22d86c98 compiler: gcc (GCC) 8.0.1 20180413 (experimental) 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+a24c397a29ad22d86c98@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in atomic_dec_and_test include/asm-generic/atomic-instrumented.h:222 [inline] BUG: KASAN: use-after-free in put_task_struct include/linux/sched/task.h:95 [inline] BUG: KASAN: use-after-free in _free_event+0x48d/0x1440 kernel/events/core.c:4451 Write of size 4 at addr ffff8801999ee2a0 by task syz-executor2/19286 CPU: 1 PID: 19286 Comm: syz-executor2 Not tainted 4.18.0-rc3+ #136 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278 atomic_dec_and_test include/asm-generic/atomic-instrumented.h:222 [inline] put_task_struct include/linux/sched/task.h:95 [inline] _free_event+0x48d/0x1440 kernel/events/core.c:4451 free_event+0xb4/0x180 kernel/events/core.c:4472 perf_event_release_kernel+0x7d5/0x1050 kernel/events/core.c:4633 perf_release+0x37/0x50 kernel/events/core.c:4647 __fput+0x355/0x8b0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1b08/0x2750 kernel/exit.c:865 do_group_exit+0x177/0x440 kernel/exit.c:968 get_signal+0x88e/0x1970 kernel/signal.c:2468 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e0/0x370 arch/x86/entry/common.c:162 prepare_exit_to_usermode+0x342/0x3b0 arch/x86/entry/common.c:197 retint_user+0x8/0x18 RIP: 0033: (null) Code: Bad RIP value. RSP: 002b:0000000020000048 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f62934726d4 RCX: 0000000000455e29 RDX: 0000000020000100 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000072bea0 R08: 0000000020000080 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bbc2c R14: 00000000004c8f48 R15: 0000000000000000 Allocated by task 19280: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc_node+0x144/0x780 mm/slab.c:3644 alloc_task_struct_node kernel/fork.c:157 [inline] dup_task_struct kernel/fork.c:779 [inline] copy_process.part.39+0x16b5/0x7220 kernel/fork.c:1641 copy_process kernel/fork.c:1616 [inline] _do_fork+0x291/0x12a0 kernel/fork.c:2099 __do_sys_clone kernel/fork.c:2206 [inline] __se_sys_clone kernel/fork.c:2200 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2200 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 19280: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 free_task_struct kernel/fork.c:162 [inline] free_task+0x16e/0x1f0 kernel/fork.c:390 copy_process.part.39+0x15c9/0x7220 kernel/fork.c:2034 copy_process kernel/fork.c:1616 [inline] _do_fork+0x291/0x12a0 kernel/fork.c:2099 __do_sys_clone kernel/fork.c:2206 [inline] __se_sys_clone kernel/fork.c:2200 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2200 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801999ee280 which belongs to the cache task_struct(81:syz2) of size 5952 The buggy address is located 32 bytes inside of 5952-byte region [ffff8801999ee280, ffff8801999ef9c0) The buggy address belongs to the page: page:ffffea0006667b80 count:1 mapcount:0 mapping:ffff8801b0bb6300 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea00071a0888 ffff8801ab65ce48 ffff8801b0bb6300 raw: 0000000000000000 ffff8801999ee280 0000000100000001 ffff8801acaa4000 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8801acaa4000 Memory state around the buggy address: ffff8801999ee180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801999ee200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801999ee280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801999ee300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801999ee380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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#bug-status-tracking for how to communicate with syzbot.