syzbot


KASAN: out-of-bounds Read in unwind_next_frame (2)

Status: auto-closed as invalid on 2021/05/04 22:57
Reported-by: syzbot+acb4e54dcc8469f15cb5@syzkaller.appspotmail.com
First crash: 1229d, last: 1229d
Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 KASAN: out-of-bounds Read in unwind_next_frame C error 14 1361d 1695d 0/1 upstream: reported C repro on 2019/09/26 21:20
upstream KASAN: out-of-bounds Read in unwind_next_frame fs syz error error 12 1693d 1958d 0/26 auto-obsoleted due to no activity on 2022/09/07 09:08
linux-4.19 KASAN: out-of-bounds Read in unwind_next_frame 1 1640d 1640d 0/1 auto-closed as invalid on 2020/03/19 23:00
linux-4.19 KASAN: stack-out-of-bounds Read in unwind_next_frame C error 525 457d 1542d 0/1 upstream: reported C repro on 2020/02/26 18:51
upstream KASAN: stack-out-of-bounds Read in unwind_next_frame kernel C 929 422d 2159d 0/26 closed as dup on 2018/06/20 07:51
android-49 KASAN: out-of-bounds Read in unwind_next_frame C 14 2046d 1862d 0/3 public: reported C repro on 2019/04/13 00:00
android-54 KASAN: out-of-bounds Read in unwind_next_frame 16 976d 1482d 0/2 auto-closed as invalid on 2022/01/13 05:16
android-414 KASAN: out-of-bounds Read in unwind_next_frame (2) C 5 1635d 1742d 0/1 public: reported C repro on 2019/08/11 14:38
android-414 KASAN: out-of-bounds Read in unwind_next_frame 1 2038d 1861d 0/1 auto-closed as invalid on 2019/04/28 00:03

Sample crash report:
ldm_validate_privheads(): Disk read failed.
 loop4: p2 < >
loop4: partition table partially beyond EOD, truncated
loop4: p2 size 2 extends beyond EOD, truncated
==================================================================
BUG: KASAN: out-of-bounds in user_mode arch/x86/include/asm/ptrace.h:131 [inline]
BUG: KASAN: out-of-bounds in unwind_next_frame+0x151a/0x1c60 arch/x86/kernel/unwind_orc.c:410
Read of size 8 at addr ffff888095277d40 by task syz-executor.5/26241

CPU: 0 PID: 26241 Comm: syz-executor.5 Not tainted 4.19.164-syzkaller #0
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+0x1fc/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 user_mode arch/x86/include/asm/ptrace.h:131 [inline]
 unwind_next_frame+0x151a/0x1c60 arch/x86/kernel/unwind_orc.c:410
 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44
 save_stack_trace_tsk+0x9c/0xf0 arch/x86/kernel/stacktrace.c:76
 proc_pid_stack+0x202/0x350 fs/proc/base.c:456
 proc_single_show+0xeb/0x170 fs/proc/base.c:755
 seq_read+0x4be/0x1160 fs/seq_file.c:229
 do_loop_readv_writev fs/read_write.c:701 [inline]
 do_loop_readv_writev fs/read_write.c:688 [inline]
 do_iter_read+0x471/0x630 fs/read_write.c:925
 vfs_readv+0xe5/0x150 fs/read_write.c:987
 do_preadv fs/read_write.c:1071 [inline]
 __do_sys_preadv fs/read_write.c:1121 [inline]
 __se_sys_preadv fs/read_write.c:1116 [inline]
 __x64_sys_preadv+0x22b/0x310 fs/read_write.c:1116
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45e219
Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f70c31bbc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219
RDX: 000000000000037d RSI: 0000000020000500 RDI: 0000000000000004
RBP: 000000000119bfd0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007fff4ef5b53f R14: 00007f70c31bc9c0 R15: 000000000119bf8c

The buggy address belongs to the page:
page:ffffea0002549dc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfff00000000000()
raw: 00fff00000000000 ffffea0002c16608 ffffea0002549d88 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888095277c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888095277c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888095277d00: f1 f1 f1 f1 00 00 f3 f3 00 00 00 00 00 00 00 00
                                              ^
 ffff888095277d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888095277e00: 00 f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 00 00 f3
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/01/04 22:57 linux-4.19.y 3207316b3bee 2a28ff1f .config console log report info ci2-linux-4-19
* Struck through repros no longer work on HEAD.