From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752837AbeDCDBE (ORCPT ); Mon, 2 Apr 2018 23:01:04 -0400 Received: from mail-io0-f198.google.com ([209.85.223.198]:54614 "EHLO mail-io0-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752171AbeDCDBC (ORCPT ); Mon, 2 Apr 2018 23:01:02 -0400 X-Google-Smtp-Source: AIpwx4+OPbulMGQy3mvxejt27BsaxWufQSVSymQ+NAMz7jIvSIbmCvIddClm5nfLXKo7PZB6gwHAHfGqnQfcCQsTReoO9tV0sPup MIME-Version: 1.0 Date: Mon, 02 Apr 2018 20:01:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <001a113f8bf6a9acd90568e8ea59@google.com> Subject: KASAN: use-after-free Read in uprobe_perf_close From: syzbot To: linux-kernel@vger.kernel.org, mingo@redhat.com, rostedt@goodmis.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot hit the following crash on upstream commit 86bbbebac1933e6e95e8234c4f7d220c5ddd38bc (Mon Apr 2 18:47:07 2018 +0000) Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=cef9473c7fa0fe8ab95e So far this crash happened 4 times on upstream. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6655209589702656 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=6230110906613760 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5321669220499456 Kernel config: https://syzkaller.appspot.com/x/.config?id=6801295859785128502 compiler: gcc (GCC) 7.1.1 20170620 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+cef9473c7fa0fe8ab95e@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: use-after-free in uprobe_perf_close+0x3e0/0x570 kernel/trace/trace_uprobe.c:1048 Read of size 4 at addr ffff8801d955264c by task syzkaller474457/4485 CPU: 0 PID: 4485 Comm: syzkaller474457 Not tainted 4.16.0+ #376 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1a7/0x27d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 uprobe_perf_close+0x3e0/0x570 kernel/trace/trace_uprobe.c:1048 trace_uprobe_register+0x4cb/0xc00 kernel/trace/trace_uprobe.c:1210 perf_trace_event_close kernel/trace/trace_event_perf.c:186 [inline] perf_uprobe_destroy+0x9b/0x130 kernel/trace/trace_event_perf.c:335 _free_event+0x3d7/0x11f0 kernel/events/core.c:4445 put_event+0x35/0x40 kernel/events/core.c:4528 perf_event_release_kernel+0x6e8/0xfe0 kernel/events/core.c:4634 perf_release+0x37/0x50 kernel/events/core.c:4644 __fput+0x327/0x7f0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1ab/0x280 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa75/0x2700 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 SYSC_exit_group kernel/exit.c:979 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:977 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x445c89 RSP: 002b:00007ffd332827e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445c89 RDX: 0000000000445c89 RSI: 0000000000445c89 RDI: 0000000000000001 RBP: 00000000006da018 R08: 0000000000000000 R09: 0000000000406fd0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000406f40 R13: 0000000000406fd0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4485: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc_node+0x144/0x760 mm/slab.c:3632 alloc_task_struct_node kernel/fork.c:157 [inline] dup_task_struct kernel/fork.c:770 [inline] copy_process.part.38+0x1ab9/0x6140 kernel/fork.c:1631 copy_process kernel/fork.c:1606 [inline] _do_fork+0x1f7/0xfa0 kernel/fork.c:2087 SYSC_clone kernel/fork.c:2194 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2188 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 0: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3486 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3744 free_task_struct kernel/fork.c:162 [inline] free_task+0x155/0x1b0 kernel/fork.c:391 __put_task_struct+0x24b/0x3e0 kernel/fork.c:657 put_task_struct include/linux/sched/task.h:96 [inline] delayed_put_task_struct+0xd8/0x3e0 kernel/exit.c:180 __rcu_reclaim kernel/rcu/rcu.h:178 [inline] rcu_do_batch kernel/rcu/tree.c:2675 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline] rcu_process_callbacks+0xd6c/0x17b0 kernel/rcu/tree.c:2914 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 The buggy address belongs to the object at ffff8801d9552600 which belongs to the cache task_struct of size 6016 The buggy address is located 76 bytes inside of 6016-byte region [ffff8801d9552600, ffff8801d9553d80) The buggy address belongs to the page: page:ffffea0007655480 count:1 mapcount:0 mapping:ffff8801d9552600 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801d9552600 0000000000000000 0000000100000001 raw: ffffea0007636ba0 ffff8801dad0c248 ffff8801dad46200 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d9552500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801d9552580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801d9552600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d9552680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d9552700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a dumb bot. 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