syzbot


general protection fault in loop_validate_file (2)

Status: public: reported syz repro on 2019/07/22 13:25
Reported-by: syzbot+f770fb3b7e5af28b4539@syzkaller.appspotmail.com
First crash: 1818d, last: 1772d
Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-44 general protection fault in loop_validate_file syz 20 2000d 1917d 0/2 public: reported syz repro on 2019/04/14 00:02
android-414 general protection fault in loop_validate_file 4 2007d 1917d 0/1 auto-closed as invalid on 2019/07/13 08:46
upstream general protection fault in loop_validate_file block C 19 2032d 2217d 0/27 closed as dup on 2018/06/18 14:51
android-49 general protection fault in loop_validate_file syz 28 1774d 1917d 0/3 public: reported syz repro on 2019/04/14 09:28
upstream general protection fault in loop_validate_file (2) block 3 1942d 1944d 11/27 fixed on 2019/04/01 10:28
linux-4.14 general protection fault in loop_validate_file C error 9 498d 1781d 0/1 upstream: reported C repro on 2019/08/28 22:28

Sample crash report:
audit: type=1400 audit(1567589755.058:9): avc:  denied  { map } for  pid=1780 comm="syz-execprog" path="/root/syzkaller-shm117115368" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file permissive=1
hrtimer: interrupt took 26329 ns
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN NOPTI
Modules linked in:
CPU: 1 PID: 2316 Comm: syz-executor.0 Not tainted 4.14.141+ #0
task:         (ptrval) task.stack:         (ptrval)
RIP: 0010:is_loop_device drivers/block/loop.c:622 [inline]
RIP: 0010:loop_validate_file+0x1ef/0x2c0 drivers/block/loop.c:633
RSP: 0018:ffff8881c7787b60 EFLAGS: 00010202
RAX: 0000000000000037 RBX: ffff8881d9abcc58 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8881d53f9cc0 RDI: 00000000000001b8
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: fffffbfff1705ba5 R11: ffffffff8b82dd2b R12: ffff8881d53f9cc0
R13: dffffc0000000000 R14: 00000000fffffff0 R15: ffff8881d53f9da0
FS:  00007f9a0d62e700(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000075c000 CR3: 00000001c8ed8006 CR4: 00000000001606a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 loop_set_fd drivers/block/loop.c:897 [inline]
 lo_ioctl+0xa47/0x1a30 drivers/block/loop.c:1407
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0x8d0/0x1870 block/ioctl.c:594
 block_ioctl+0xd9/0x120 fs/block_dev.c:1881
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459879
RSP: 002b:00007f9a0d62dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879
RDX: 0000000000000006 RSI: 0000000000004c00 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9a0d62e6d4
R13: 00000000004c2f80 R14: 00000000004d66b8 R15: 00000000ffffffff
Code: f0 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 d1 00 00 00 48 8b ad f0 00 00 00 48 8d bd b8 01 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 a7 00 00 00 48 8b ad b8 01 00 00 48 89 e8 
RIP: is_loop_device drivers/block/loop.c:622 [inline] RSP: ffff8881c7787b60
RIP: loop_validate_file+0x1ef/0x2c0 drivers/block/loop.c:633 RSP: ffff8881c7787b60
---[ end trace fcd2e8c3d6d60ae8 ]---

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/09/04 09:39 android-4.14 38733badc0e6 12381952 .config console log report syz ci-android-414-kasan-gce-root
2019/09/06 21:03 android-4.14 4eccd8013349 a60cb4cd .config console log report ci-android-414-kasan-gce-root
2019/09/04 09:09 android-4.14 38733badc0e6 12381952 .config console log report ci-android-414-kasan-gce-root
2019/08/23 14:00 android-4.14 e204fa49a029 ca6f3cfa .config console log report ci-android-414-kasan-gce-root
2019/08/05 21:14 android-4.14 20c71e6d5a16 6affd8e8 .config console log report ci-android-414-kasan-gce-root
2019/07/22 12:24 android-4.14 269f182fac0b b3c615f5 .config console log report ci-android-414-kasan-gce-root
* Struck through repros no longer work on HEAD.