syzbot


BUG: unable to handle kernel paging request in security_compute_sid

Status: closed as dup on 2017/12/22 22:14
Reported-by: syzbot+d10271989aa91b0c140f6c218c5537f942888ce2@syzkaller.appspotmail.com
First crash: 1817d, last: 1817d
Duplicate of (1):
Title Repro Cause bisect Fix bisect Count Last Reported
KASAN: use-after-free Read in __list_del_entry_valid (2) C 11 1815d 1817d

Sample crash report:
BUG: unable to handle kernel paging request at 00000000830e2118
IP: security_compute_sid.part.11+0x418/0x710 security/selinux/ss/services.c:1640
PGD 0 P4D 0 
Oops: 0000 [#1] SMP
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3391 Comm: kworker/u4:0 Not tainted 4.15.0-rc3-next-20171214+ #67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:security_compute_sid.part.11+0x418/0x710 security/selinux/ss/services.c:1640
RSP: 0018:ffffc90001993c70 EFLAGS: 00010293
RAX: ffff880216ba0800 RBX: 0000000000000002 RCX: ffffffff81667b88
RDX: 0000000000000000 RSI: 0000000000000005 RDI: ffffffff83fd17a0
RBP: ffffc90001993d20 R08: 0000000000000001 R09: 0000000000000001
R10: ffffc90001993be0 R11: 0000000000000000 R12: ffff88021694f188
R13: 0000000000000010 R14: ffff880216592388 R15: 00000000830e20e0
FS:  0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000830e2118 CR3: 000000000301e001 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 security_compute_sid+0x92/0xa0 security/selinux/ss/services.c:1598
 security_transition_sid+0x57/0x70 security/selinux/ss/services.c:1764
 selinux_bprm_set_creds+0x215/0x2f0 security/selinux/hooks.c:2423
 security_bprm_set_creds+0x41/0x60 security/security.c:332
 prepare_binprm+0xae/0x1f0 fs/exec.c:1561
 do_execveat_common.isra.30+0x6f7/0xb90 fs/exec.c:1784
 do_execve+0x31/0x40 fs/exec.c:1848
 call_usermodehelper_exec_async+0x104/0x190 kernel/umh.c:100
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524
Code: 40 74 15 41 83 fd 10 74 0f e8 d5 27 c5 ff 4d 85 ff 75 33 e9 6f 02 00 00 e8 c6 27 c5 ff 4d 85 ff 0f 84 e6 02 00 00 e8 b8 27 c5 ff <41> 80 7f 38 02 0f 84 5c 01 00 00 e8 a8 27 c5 ff 41 8b 06 89 45 
RIP: security_compute_sid.part.11+0x418/0x710 security/selinux/ss/services.c:1640 RSP: ffffc90001993c70
CR2: 00000000830e2118
---[ end trace fe59d8175af57ffc ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-next-kasan-gce 2017/12/18 18:46 linux-next 6084b576dca2 1c4160ef .config log report syz C
* Struck through repros no longer work on HEAD.