From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751465AbeDFACQ (ORCPT ); Thu, 5 Apr 2018 20:02:16 -0400 Received: from mail-it0-f70.google.com ([209.85.214.70]:43384 "EHLO mail-it0-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751262AbeDFACC (ORCPT ); Thu, 5 Apr 2018 20:02:02 -0400 X-Google-Smtp-Source: AIpwx49J1MQ9UnUyHNFMfYMqEeaMuAWi/wXjI3/M3l0JmgyoEqRj2S90+1kHkkg0oqcit0o2x6Wekpd0uusc15R30Q3WvqbPBJsl MIME-Version: 1.0 Date: Thu, 05 Apr 2018 17:02:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <94eb2c05611408a11a056922c4cb@google.com> Subject: KASAN: alloca-out-of-bounds Read in unwind_next_frame From: syzbot To: hpa@zytor.com, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mhiramat@kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org 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 06dd3dfeea60e2a6457a6aedf97afc8e6d2ba497 (Thu Apr 5 03:07:20 2018 +0000) Merge tag 'char-misc-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=9d1d9866b0b8ee6e0a8c syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=6478299081474048 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5324218015154176 Kernel config: https://syzkaller.appspot.com/x/.config?id=216543573824217049 compiler: gcc (GCC) 8.0.1 20180301 (experimental) IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+9d1d9866b0b8ee6e0a8c@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. ================================================================== BUG: KASAN: alloca-out-of-bounds in __read_once_size include/linux/compiler.h:188 [inline] BUG: KASAN: alloca-out-of-bounds in unwind_next_frame.part.7+0x7ce/0x9c0 arch/x86/kernel/unwind_frame.c:326 Read of size 8 at addr ffff8801b05e67f8 by task syz-executor2/11326 CPU: 0 PID: 11326 Comm: syz-executor2 Not tainted 4.16.0+ #1 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+0x1b9/0x29f lib/dump_stack.c:53 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0xac/0x2f5 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __read_once_size include/linux/compiler.h:188 [inline] unwind_next_frame.part.7+0x7ce/0x9c0 arch/x86/kernel/unwind_frame.c:326 unwind_next_frame+0x3e/0x50 arch/x86/kernel/unwind_frame.c:287 __save_stack_trace+0x6e/0xd0 arch/x86/kernel/stacktrace.c:44 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 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+0x86/0x2d0 mm/slab.c:3744 __d_free+0x20/0x30 fs/dcache.c:257 __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+0x941/0x15f0 kernel/rcu/tree.c:2914 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x1d1/0x200 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:525 [inline] smp_apic_timer_interrupt+0x17e/0x710 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:862 RIP: 0010:kasan_unpoison_shadow+0x1/0x50 mm/kasan/kasan.c:68 RSP: 0018:ffff8801b05e67e8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: ffff8801c1b24100 RBX: 0000000000000000 RCX: ffffffff859d4219 RDX: 0000000000000000 RSI: 00000000000000a8 RDI: ffff8801b05e6760 RBP: ffff8801b05e67f8 R08: ffff8801c1b24100 R09: ffffed003b6046c2 R10: ffffed003b6046c2 R11: ffff8801db023613 R12: 0000000000000015 R13: 0000000000000001 R14: 0000000000000016 R15: dffffc0000000000 constrain_params_by_rules+0xbaa/0x1410 sound/core/pcm_param_trace.h:28 snd_pcm_hw_refine+0x8e9/0x1180 sound/core/pcm_native.c:502 snd_pcm_hw_param_mask sound/core/oss/pcm_oss.c:205 [inline] snd_pcm_oss_change_params+0x8ce/0x3d10 sound/core/oss/pcm_oss.c:870 snd_pcm_oss_make_ready+0xe3/0x140 sound/core/oss/pcm_oss.c:1127 snd_pcm_oss_sync.isra.27+0x24b/0x850 sound/core/oss/pcm_oss.c:1651 snd_pcm_oss_release+0x214/0x290 sound/core/oss/pcm_oss.c:2446 __fput+0x34d/0x890 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1e4/0x290 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1aee/0x2730 kernel/exit.c:865 do_group_exit+0x16f/0x430 kernel/exit.c:968 get_signal+0x886/0x1960 kernel/signal.c:2469 do_signal+0x90/0x2020 arch/x86/kernel/signal.c:810 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_64+0x792/0x9d0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4552d9 RSP: 002b:00007fd689eb5c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007fd689eb66d4 RCX: 00000000004552d9 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 000000000000000f RBP: 000000000072c010 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000027d R14: 00000000006f6c58 R15: 0000000000000002 The buggy address belongs to the page: page:ffffea0006c17980 count:0 mapcount:0 mapping:0000000000000000 index:0xffff8801b05e69c0 flags: 0x2fffc0000000000() raw: 02fffc0000000000 0000000000000000 ffff8801b05e69c0 00000000ffffffff raw: dead000000000100 dead000000000200 ffff8801dad7f600 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b05e6680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801b05e6700: 00 00 00 00 00 00 00 00 00 00 00 00 ca ca ca ca > ffff8801b05e6780: 00 00 00 00 00 00 00 00 00 00 04 cb cb cb cb cb ^ ffff8801b05e6800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801b05e6880: 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2 ================================================================== --- This bug is generated by a dumb bot. 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