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Sat, 26 Jan 2019 04:07:03 -0800 (PST) Date: Sat, 26 Jan 2019 04:07:03 -0800 In-Reply-To: <0000000000007b7cbf057edb4e33@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000001b122305805b4843@google.com> Subject: Re: KASAN: out-of-bounds Read in unwind_next_frame From: syzbot To: bp@alien8.de, dvyukov@google.com, hpa@zytor.com, linux-kernel@vger.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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: ba6069759381 Merge tag 'mmc-v5.0-rc2' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=121e935f400000 kernel config: https://syzkaller.appspot.com/x/.config?x=505743eba4e4f68 dashboard link: https://syzkaller.appspot.com/bug?extid=2fdf0ed2b3bc8fc51fc6 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15f6c887400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+2fdf0ed2b3bc8fc51fc6@syzkaller.appspotmail.com IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 ================================================================== BUG: KASAN: out-of-bounds in unwind_next_frame.part.0+0x756/0xa90 arch/x86/kernel/unwind_frame.c:324 Read of size 8 at addr ffff88809476fb68 by task syz-executor1/12572 CPU: 1 PID: 12572 Comm: syz-executor1 Not tainted 5.0.0-rc3+ #44 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 unwind_next_frame.part.0+0x756/0xa90 arch/x86/kernel/unwind_frame.c:324 unwind_next_frame+0x3b/0x50 arch/x86/kernel/unwind_frame.c:287 __save_stack_trace+0x7a/0xf0 arch/x86/kernel/stacktrace.c:44 save_stack_trace_tsk arch/x86/kernel/stacktrace.c:76 [inline] save_stack_trace_tsk+0x9e/0xd0 arch/x86/kernel/stacktrace.c:69 proc_pid_stack+0x272/0x430 fs/proc/base.c:438 proc_single_show+0xf6/0x180 fs/proc/base.c:739 seq_read+0x4db/0x1130 fs/seq_file.c:229 do_loop_readv_writev fs/read_write.c:700 [inline] do_loop_readv_writev fs/read_write.c:687 [inline] do_iter_read+0x4a9/0x660 fs/read_write.c:921 vfs_readv+0x175/0x1c0 fs/read_write.c:983 do_preadv+0x1c4/0x280 fs/read_write.c:1067 __do_sys_preadv fs/read_write.c:1117 [inline] __se_sys_preadv fs/read_write.c:1112 [inline] __x64_sys_preadv+0x9a/0xf0 fs/read_write.c:1112 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458099 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fedc3d91c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000458099 RDX: 1000000000000156 RSI: 0000000020000480 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fedc3d926d4 R13: 00000000004c4b67 R14: 00000000004d82e0 R15: 00000000ffffffff The buggy address belongs to the page: page:ffffea000251dbc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x1fffc0000000000() raw: 01fffc0000000000 0000000000000000 ffffffff02510101 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809476fa00: 00 f2 f2 00 f2 f2 f2 00 f2 f2 f2 00 f2 f2 f2 f8 ffff88809476fa80: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88809476fb00: f1 f1 f1 f1 00 f2 f2 f2 00 f3 f3 f3 00 00 00 00 ^ ffff88809476fb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 ffff88809476fc00: f1 f1 00 f2 f2 f2 00 00 f2 f2 04 f3 f3 f3 00 00 ==================================================================