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Date:   Tue, 19 Dec 2017 23:48:02 -0800
From:   syzbot 
        <bot+904436b33e141b4f4c57c1ddc94199ffd2e34b9d@...kaller.appspotmail.com>
To:     elfring@...rs.sourceforge.net, eparis@...isplace.org,
        gregkh@...uxfoundation.org, james.l.morris@...cle.com,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, paul@...l-moore.com,
        pombredanne@...b.com, sds@...ho.nsa.gov, selinux@...ho.nsa.gov,
        serge@...lyn.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de
Subject: BUG: unable to handle kernel NULL pointer dereference in sidtab_search_core

Hello,

syzkaller hit the following crash on  
6084b576dca2e898f5c101baef151f7bfdbb606d
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


SELinux: security_compute_sid:  unrecognized SID 1
SELinux: security_compute_sid:  unrecognized SID 1
SELinux: security_compute_sid:  unrecognized SID 1
SELinux: security_compute_sid:  unrecognized SID 1
SELinux: security_compute_sid:  unrecognized SID 1
BUG: unable to handle kernel NULL pointer dereference at 0000000000000001
IP: sidtab_search_core+0x88/0x110 security/selinux/ss/sidtab.c:100
PGD 0 P4D 0
Oops: 0000 [#1] SMP
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 4252 Comm: kworker/u4:1 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:sidtab_search_core+0x88/0x110 security/selinux/ss/sidtab.c:100
RSP: 0018:ffffc900028abc18 EFLAGS: 00010293
RAX: ffff8802131a87c0 RBX: 0000000000000001 RCX: ffffffff8165d978
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff83fd17a0
RBP: ffffc900028abc40 R08: 0000000000000001 R09: 0000000000000001
R10: ffffc900028abbe0 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000000 R15: ffff880214d93800
FS:  0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000001 CR3: 0000000214e31000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  sidtab_search+0x1f/0x30 security/selinux/ss/sidtab.c:111
  security_compute_sid.part.11+0xe2/0x710 security/selinux/ss/services.c:1618
  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: 8b 5b 50 48 85 db 75 e5 e8 e6 c9 c5 ff 49 8b 5f 18 48 85 db 75 10 eb  
43 e8 d6 c9 c5 ff 48 8b 5b 50 48 85 db 74 35 e8 c8 c9 c5 ff <44> 8b 23 41  
83 fc 02 76 e4 e8 ba c9 c5 ff 41 83 fc 03 75 1c 48
RIP: sidtab_search_core+0x88/0x110 security/selinux/ss/sidtab.c:100 RSP:  
ffffc900028abc18
CR2: 0000000000000001
---[ end trace 571c0ea6c6959387 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.
Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com>

syzbot will keep track of this bug report.
Once a fix for this bug is merged into any tree, reply to this email with:
#syz fix: exact-commit-title
If you want to test a patch for this bug, please reply with:
#syz test: git://repo/address.git branch
and provide the patch inline or as an attachment.
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug  
report.
Note: all commands must start from beginning of the line in the email body.

View attachment "config.txt" of type "text/plain" (126475 bytes)

Download attachment "raw.log" of type "application/octet-stream" (28406 bytes)

View attachment "repro.txt" of type "text/plain" (536 bytes)

Download attachment "repro.c" of type "application/octet-stream" (1175 bytes)

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