possible deadlock in sidtab_sid2str_put

From: syzbot
Date: Mon Jan 27 2020 - 23:27:12 EST

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Hello,

syzbot found the following crash on:

HEAD commit: b0be0eff Merge tag 'x86-pti-2020-01-28' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15232735e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9784e57c96a92f20
dashboard link: https://syzkaller.appspot.com/bug?extid=61cba5033e2072d61806
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+61cba5033e2072d61806@xxxxxxxxxxxxxxxxxxxxxxxxx

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.5.0-syzkaller #0 Not tainted
-----------------------------------------------------
syz-executor.3/20867 [HC0[0]:SC0[2]:HE1:SE0] is trying to acquire:
ffff888022b68098 (&(&s->cache_lock)->rlock){+.+.}, at: spin_lock include/linux/spinlock.h:338 [inline]
ffff888022b68098 (&(&s->cache_lock)->rlock){+.+.}, at: sidtab_sid2str_put.part.0+0x36/0x880 security/selinux/ss/sidtab.c:533

and this task is already holding:
ffffffff898605d8 (&(&nf_conntrack_locks[i])->rlock){+.-.}, at: spin_lock include/linux/spinlock.h:338 [inline]
ffffffff898605d8 (&(&nf_conntrack_locks[i])->rlock){+.-.}, at: nf_conntrack_lock+0x17/0x70 net/netfilter/nf_conntrack_core.c:91
which would create a new lock dependency:
(&(&nf_conntrack_locks[i])->rlock){+.-.} -> (&(&s->cache_lock)->rlock){+.+.}

but this new dependency connects a SOFTIRQ-irq-safe lock:
(&(&nf_conntrack_locks[i])->rlock){+.-.}

... which became SOFTIRQ-irq-safe at:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
nf_conntrack_lock+0x17/0x70 net/netfilter/nf_conntrack_core.c:91
nf_conntrack_double_lock.isra.0+0xac/0x100 net/netfilter/nf_conntrack_core.c:134
__nf_conntrack_confirm+0x252/0x1710 net/netfilter/nf_conntrack_core.c:963
nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline]
nf_confirm+0x3e7/0x4d0 net/netfilter/nf_conntrack_proto.c:154
ipv4_confirm+0x14c/0x240 net/netfilter/nf_conntrack_proto.c:169
nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline]
nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:512
nf_hook include/linux/netfilter.h:262 [inline]
NF_HOOK include/linux/netfilter.h:305 [inline]
ip_local_deliver+0x352/0x520 net/ipv4/ip_input.c:252
dst_input include/net/dst.h:442 [inline]
ip_sublist_rcv_finish+0x9b/0x2d0 net/ipv4/ip_input.c:549
ip_list_rcv_finish net/ipv4/ip_input.c:599 [inline]
ip_sublist_rcv+0x5a6/0xa20 net/ipv4/ip_input.c:607
ip_list_rcv+0x37e/0x4bf net/ipv4/ip_input.c:642
__netif_receive_skb_list_ptype net/core/dev.c:5193 [inline]
__netif_receive_skb_list_core+0x5fc/0x9d0 net/core/dev.c:5241
__netif_receive_skb_list net/core/dev.c:5293 [inline]
netif_receive_skb_list_internal+0x7eb/0xe50 net/core/dev.c:5388
gro_normal_list.part.0+0x1e/0xb0 net/core/dev.c:5499
gro_normal_list net/core/dev.c:6232 [inline]
napi_complete_done+0x208/0x510 net/core/dev.c:6220
virtqueue_napi_complete+0x31/0xa0 drivers/net/virtio_net.c:329
virtnet_poll+0xbad/0xe90 drivers/net/virtio_net.c:1432
napi_poll net/core/dev.c:6534 [inline]
net_rx_action+0x508/0x1120 net/core/dev.c:6602
__do_softirq+0x262/0x98c kernel/softirq.c:292
run_ksoftirqd kernel/softirq.c:603 [inline]
run_ksoftirqd+0x8e/0x110 kernel/softirq.c:595
smpboot_thread_fn+0x6a3/0xa40 kernel/smpboot.c:165
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

to a SOFTIRQ-irq-unsafe lock:
(&(&s->cache_lock)->rlock){+.+.}

... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
sidtab_sid2str_put.part.0+0x36/0x880 security/selinux/ss/sidtab.c:533
sidtab_sid2str_put+0xa0/0xc0 security/selinux/ss/sidtab.c:566
sidtab_entry_to_string security/selinux/ss/services.c:1279 [inline]
sidtab_entry_to_string+0xf2/0x110 security/selinux/ss/services.c:1266
security_sid_to_context_core+0x2c6/0x3c0 security/selinux/ss/services.c:1361
security_sid_to_context+0x34/0x40 security/selinux/ss/services.c:1384
avc_audit_post_callback+0x102/0x790 security/selinux/avc.c:709
common_lsm_audit+0x5ac/0x1e00 security/lsm_audit.c:466
slow_avc_audit+0x16a/0x1f0 security/selinux/avc.c:782
avc_audit security/selinux/include/avc.h:140 [inline]
avc_has_perm+0x543/0x610 security/selinux/avc.c:1185
inode_has_perm+0x1a8/0x230 security/selinux/hooks.c:1631
selinux_mmap_file+0x10a/0x1d0 security/selinux/hooks.c:3701
security_mmap_file+0xa4/0x1e0 security/security.c:1482
vm_mmap_pgoff+0xf0/0x230 mm/util.c:502
vm_mmap+0x94/0xc0 mm/util.c:525
elf_map+0x10a/0x2b0 fs/binfmt_elf.c:377
load_elf_binary+0xd4b/0x5310 fs/binfmt_elf.c:982
search_binary_handler fs/exec.c:1658 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1635
exec_binprm fs/exec.c:1701 [inline]
__do_execve_file.isra.0+0x1329/0x22b0 fs/exec.c:1821
do_execveat_common fs/exec.c:1867 [inline]
do_execve fs/exec.c:1884 [inline]
__do_sys_execve fs/exec.c:1960 [inline]
__se_sys_execve fs/exec.c:1955 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1955
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&(&s->cache_lock)->rlock);
local_irq_disable();
lock(&(&nf_conntrack_locks[i])->rlock);
lock(&(&s->cache_lock)->rlock);
<Interrupt>
lock(&(&nf_conntrack_locks[i])->rlock);

*** DEADLOCK ***

4 locks held by syz-executor.3/20867:
#0: ffffffff8c1acc68 (&table[i].mutex){+.+.}, at: nfnl_lock net/netfilter/nfnetlink.c:62 [inline]
#0: ffffffff8c1acc68 (&table[i].mutex){+.+.}, at: nfnetlink_rcv_msg+0x9ee/0xfb0 net/netfilter/nfnetlink.c:224
#1: ffff88800ce3c5d8 (nlk_cb_mutex-NETFILTER){+.+.}, at: netlink_dump+0xe7/0xfb0 net/netlink/af_netlink.c:2199
#2: ffffffff898605d8 (&(&nf_conntrack_locks[i])->rlock){+.-.}, at: spin_lock include/linux/spinlock.h:338 [inline]
#2: ffffffff898605d8 (&(&nf_conntrack_locks[i])->rlock){+.-.}, at: nf_conntrack_lock+0x17/0x70 net/netfilter/nf_conntrack_core.c:91
#3: ffffffff8b7df008 (&selinux_ss.policy_rwlock){.+.?}, at: security_sid_to_context_core+0x1ca/0x3c0 security/selinux/ss/services.c:1344

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&(&nf_conntrack_locks[i])->rlock){+.-.} {
HARDIRQ-ON-W at:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
nf_conntrack_lock+0x17/0x70 net/netfilter/nf_conntrack_core.c:91
get_next_corpse net/netfilter/nf_conntrack_core.c:2001 [inline]
nf_ct_iterate_cleanup+0x1d2/0x4e0 net/netfilter/nf_conntrack_core.c:2035
nf_ct_iterate_destroy+0x12e/0x160 net/netfilter/nf_conntrack_core.c:2162
nf_conntrack_helper_unregister+0x111/0x160 net/netfilter/nf_conntrack_helper.c:469
nf_conntrack_helpers_unregister net/netfilter/nf_conntrack_helper.c:532 [inline]
nf_conntrack_helpers_register+0xaa/0xe0 net/netfilter/nf_conntrack_helper.c:523
nf_conntrack_sip_init+0x266/0x2a4 net/netfilter/nf_conntrack_sip.c:1693
do_one_initcall+0x120/0x820 init/main.c:939
do_initcall_level init/main.c:1007 [inline]
do_initcalls init/main.c:1015 [inline]
do_basic_setup init/main.c:1032 [inline]
kernel_init_freeable+0x4ca/0x570 init/main.c:1203
kernel_init+0x12/0x1bf init/main.c:1110
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
IN-SOFTIRQ-W at:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
nf_conntrack_lock+0x17/0x70 net/netfilter/nf_conntrack_core.c:91
nf_conntrack_double_lock.isra.0+0xac/0x100 net/netfilter/nf_conntrack_core.c:134
__nf_conntrack_confirm+0x252/0x1710 net/netfilter/nf_conntrack_core.c:963
nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline]
nf_confirm+0x3e7/0x4d0 net/netfilter/nf_conntrack_proto.c:154
ipv4_confirm+0x14c/0x240 net/netfilter/nf_conntrack_proto.c:169
nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline]
nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:512
nf_hook include/linux/netfilter.h:262 [inline]
NF_HOOK include/linux/netfilter.h:305 [inline]
ip_local_deliver+0x352/0x520 net/ipv4/ip_input.c:252
dst_input include/net/dst.h:442 [inline]
ip_sublist_rcv_finish+0x9b/0x2d0 net/ipv4/ip_input.c:549
ip_list_rcv_finish net/ipv4/ip_input.c:599 [inline]
ip_sublist_rcv+0x5a6/0xa20 net/ipv4/ip_input.c:607
ip_list_rcv+0x37e/0x4bf net/ipv4/ip_input.c:642
__netif_receive_skb_list_ptype net/core/dev.c:5193 [inline]
__netif_receive_skb_list_core+0x5fc/0x9d0 net/core/dev.c:5241
__netif_receive_skb_list net/core/dev.c:5293 [inline]
netif_receive_skb_list_internal+0x7eb/0xe50 net/core/dev.c:5388
gro_normal_list.part.0+0x1e/0xb0 net/core/dev.c:5499
gro_normal_list net/core/dev.c:6232 [inline]
napi_complete_done+0x208/0x510 net/core/dev.c:6220
virtqueue_napi_complete+0x31/0xa0 drivers/net/virtio_net.c:329
virtnet_poll+0xbad/0xe90 drivers/net/virtio_net.c:1432
napi_poll net/core/dev.c:6534 [inline]
net_rx_action+0x508/0x1120 net/core/dev.c:6602
__do_softirq+0x262/0x98c kernel/softirq.c:292
run_ksoftirqd kernel/softirq.c:603 [inline]
run_ksoftirqd+0x8e/0x110 kernel/softirq.c:595
smpboot_thread_fn+0x6a3/0xa40 kernel/smpboot.c:165
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
INITIAL USE at:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
nf_conntrack_lock+0x17/0x70 net/netfilter/nf_conntrack_core.c:91
get_next_corpse net/netfilter/nf_conntrack_core.c:2001 [inline]
nf_ct_iterate_cleanup+0x1d2/0x4e0 net/netfilter/nf_conntrack_core.c:2035
nf_ct_iterate_destroy+0x12e/0x160 net/netfilter/nf_conntrack_core.c:2162
nf_conntrack_helper_unregister+0x111/0x160 net/netfilter/nf_conntrack_helper.c:469
nf_conntrack_helpers_unregister net/netfilter/nf_conntrack_helper.c:532 [inline]
nf_conntrack_helpers_register+0xaa/0xe0 net/netfilter/nf_conntrack_helper.c:523
nf_conntrack_sip_init+0x266/0x2a4 net/netfilter/nf_conntrack_sip.c:1693
do_one_initcall+0x120/0x820 init/main.c:939
do_initcall_level init/main.c:1007 [inline]
do_initcalls init/main.c:1015 [inline]
do_basic_setup init/main.c:1032 [inline]
kernel_init_freeable+0x4ca/0x570 init/main.c:1203
kernel_init+0x12/0x1bf init/main.c:1110
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
}
... key at: [<ffffffff8c1ad440>] __key.79496+0x0/0x40
... acquired at:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
sidtab_sid2str_put.part.0+0x36/0x880 security/selinux/ss/sidtab.c:533
sidtab_sid2str_put security/selinux/ss/sidtab.c:594 [inline]
sidtab_sid2str_get+0x3b5/0x66e security/selinux/ss/sidtab.c:594
sidtab_entry_to_string+0x37/0x110 security/selinux/ss/services.c:1271
security_sid_to_context_core+0x2c6/0x3c0 security/selinux/ss/services.c:1361
security_sid_to_context+0x34/0x40 security/selinux/ss/services.c:1384
selinux_secid_to_secctx+0x2d/0x40 security/selinux/hooks.c:6451
security_secid_to_secctx+0x75/0xc0 security/security.c:1950
ctnetlink_dump_secctx.isra.0+0x8c/0x330 net/netfilter/nf_conntrack_netlink.c:335
ctnetlink_dump_info net/netfilter/nf_conntrack_netlink.c:531 [inline]
ctnetlink_fill_info+0x750/0xd40 net/netfilter/nf_conntrack_netlink.c:591
ctnetlink_dump_table+0x68c/0x1130 net/netfilter/nf_conntrack_netlink.c:979
netlink_dump+0x558/0xfb0 net/netlink/af_netlink.c:2244
__netlink_dump_start+0x66a/0x930 net/netlink/af_netlink.c:2352
netlink_dump_start include/linux/netlink.h:233 [inline]
ctnetlink_get_conntrack+0x55e/0x6a0 net/netfilter/nf_conntrack_netlink.c:1355
nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0x58c/0x7d0 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:639 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:659
____sys_sendmsg+0x753/0x880 net/socket.c:2330
___sys_sendmsg+0x100/0x170 net/socket.c:2384
__sys_sendmsg+0x105/0x1d0 net/socket.c:2417
__do_sys_sendmsg net/socket.c:2426 [inline]
__se_sys_sendmsg net/socket.c:2424 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2424
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe

the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (&(&s->cache_lock)->rlock){+.+.} {
HARDIRQ-ON-W at:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
sidtab_sid2str_put.part.0+0x36/0x880 security/selinux/ss/sidtab.c:533
sidtab_sid2str_put+0xa0/0xc0 security/selinux/ss/sidtab.c:566
sidtab_entry_to_string security/selinux/ss/services.c:1279 [inline]
sidtab_entry_to_string+0xf2/0x110 security/selinux/ss/services.c:1266
security_sid_to_context_core+0x2c6/0x3c0 security/selinux/ss/services.c:1361
security_sid_to_context+0x34/0x40 security/selinux/ss/services.c:1384
avc_audit_post_callback+0x102/0x790 security/selinux/avc.c:709
common_lsm_audit+0x5ac/0x1e00 security/lsm_audit.c:466
slow_avc_audit+0x16a/0x1f0 security/selinux/avc.c:782
avc_audit security/selinux/include/avc.h:140 [inline]
avc_has_perm+0x543/0x610 security/selinux/avc.c:1185
inode_has_perm+0x1a8/0x230 security/selinux/hooks.c:1631
selinux_mmap_file+0x10a/0x1d0 security/selinux/hooks.c:3701
security_mmap_file+0xa4/0x1e0 security/security.c:1482
vm_mmap_pgoff+0xf0/0x230 mm/util.c:502
vm_mmap+0x94/0xc0 mm/util.c:525
elf_map+0x10a/0x2b0 fs/binfmt_elf.c:377
load_elf_binary+0xd4b/0x5310 fs/binfmt_elf.c:982
search_binary_handler fs/exec.c:1658 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1635
exec_binprm fs/exec.c:1701 [inline]
__do_execve_file.isra.0+0x1329/0x22b0 fs/exec.c:1821
do_execveat_common fs/exec.c:1867 [inline]
do_execve fs/exec.c:1884 [inline]
__do_sys_execve fs/exec.c:1960 [inline]
__se_sys_execve fs/exec.c:1955 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1955
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
SOFTIRQ-ON-W at:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
sidtab_sid2str_put.part.0+0x36/0x880 security/selinux/ss/sidtab.c:533
sidtab_sid2str_put+0xa0/0xc0 security/selinux/ss/sidtab.c:566
sidtab_entry_to_string security/selinux/ss/services.c:1279 [inline]
sidtab_entry_to_string+0xf2/0x110 security/selinux/ss/services.c:1266
security_sid_to_context_core+0x2c6/0x3c0 security/selinux/ss/services.c:1361
security_sid_to_context+0x34/0x40 security/selinux/ss/services.c:1384
avc_audit_post_callback+0x102/0x790 security/selinux/avc.c:709
common_lsm_audit+0x5ac/0x1e00 security/lsm_audit.c:466
slow_avc_audit+0x16a/0x1f0 security/selinux/avc.c:782
avc_audit security/selinux/include/avc.h:140 [inline]
avc_has_perm+0x543/0x610 security/selinux/avc.c:1185
inode_has_perm+0x1a8/0x230 security/selinux/hooks.c:1631
selinux_mmap_file+0x10a/0x1d0 security/selinux/hooks.c:3701
security_mmap_file+0xa4/0x1e0 security/security.c:1482
vm_mmap_pgoff+0xf0/0x230 mm/util.c:502
vm_mmap+0x94/0xc0 mm/util.c:525
elf_map+0x10a/0x2b0 fs/binfmt_elf.c:377
load_elf_binary+0xd4b/0x5310 fs/binfmt_elf.c:982
search_binary_handler fs/exec.c:1658 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1635
exec_binprm fs/exec.c:1701 [inline]
__do_execve_file.isra.0+0x1329/0x22b0 fs/exec.c:1821
do_execveat_common fs/exec.c:1867 [inline]
do_execve fs/exec.c:1884 [inline]
__do_sys_execve fs/exec.c:1960 [inline]
__se_sys_execve fs/exec.c:1955 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1955
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
INITIAL USE at:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
sidtab_sid2str_put.part.0+0x36/0x880 security/selinux/ss/sidtab.c:533
sidtab_sid2str_put+0xa0/0xc0 security/selinux/ss/sidtab.c:566
sidtab_entry_to_string security/selinux/ss/services.c:1279 [inline]
sidtab_entry_to_string+0xf2/0x110 security/selinux/ss/services.c:1266
security_sid_to_context_core+0x2c6/0x3c0 security/selinux/ss/services.c:1361
security_sid_to_context+0x34/0x40 security/selinux/ss/services.c:1384
avc_audit_post_callback+0x102/0x790 security/selinux/avc.c:709
common_lsm_audit+0x5ac/0x1e00 security/lsm_audit.c:466
slow_avc_audit+0x16a/0x1f0 security/selinux/avc.c:782
avc_audit security/selinux/include/avc.h:140 [inline]
avc_has_perm+0x543/0x610 security/selinux/avc.c:1185
inode_has_perm+0x1a8/0x230 security/selinux/hooks.c:1631
selinux_mmap_file+0x10a/0x1d0 security/selinux/hooks.c:3701
security_mmap_file+0xa4/0x1e0 security/security.c:1482
vm_mmap_pgoff+0xf0/0x230 mm/util.c:502
vm_mmap+0x94/0xc0 mm/util.c:525
elf_map+0x10a/0x2b0 fs/binfmt_elf.c:377
load_elf_binary+0xd4b/0x5310 fs/binfmt_elf.c:982
search_binary_handler fs/exec.c:1658 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1635
exec_binprm fs/exec.c:1701 [inline]
__do_execve_file.isra.0+0x1329/0x22b0 fs/exec.c:1821
do_execveat_common fs/exec.c:1867 [inline]
do_execve fs/exec.c:1884 [inline]
__do_sys_execve fs/exec.c:1960 [inline]
__se_sys_execve fs/exec.c:1955 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1955
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
}
... key at: [<ffffffff8b7dec80>] __key.69173+0x0/0x40
... acquired at:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
sidtab_sid2str_put.part.0+0x36/0x880 security/selinux/ss/sidtab.c:533
sidtab_sid2str_put security/selinux/ss/sidtab.c:594 [inline]
sidtab_sid2str_get+0x3b5/0x66e security/selinux/ss/sidtab.c:594
sidtab_entry_to_string+0x37/0x110 security/selinux/ss/services.c:1271
security_sid_to_context_core+0x2c6/0x3c0 security/selinux/ss/services.c:1361
security_sid_to_context+0x34/0x40 security/selinux/ss/services.c:1384
selinux_secid_to_secctx+0x2d/0x40 security/selinux/hooks.c:6451
security_secid_to_secctx+0x75/0xc0 security/security.c:1950
ctnetlink_dump_secctx.isra.0+0x8c/0x330 net/netfilter/nf_conntrack_netlink.c:335
ctnetlink_dump_info net/netfilter/nf_conntrack_netlink.c:531 [inline]
ctnetlink_fill_info+0x750/0xd40 net/netfilter/nf_conntrack_netlink.c:591
ctnetlink_dump_table+0x68c/0x1130 net/netfilter/nf_conntrack_netlink.c:979
netlink_dump+0x558/0xfb0 net/netlink/af_netlink.c:2244
__netlink_dump_start+0x66a/0x930 net/netlink/af_netlink.c:2352
netlink_dump_start include/linux/netlink.h:233 [inline]
ctnetlink_get_conntrack+0x55e/0x6a0 net/netfilter/nf_conntrack_netlink.c:1355
nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0x58c/0x7d0 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:639 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:659
____sys_sendmsg+0x753/0x880 net/socket.c:2330
___sys_sendmsg+0x100/0x170 net/socket.c:2384
__sys_sendmsg+0x105/0x1d0 net/socket.c:2417
__do_sys_sendmsg net/socket.c:2426 [inline]
__se_sys_sendmsg net/socket.c:2424 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2424
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe

stack backtrace:
CPU: 0 PID: 20867 Comm: syz-executor.3 Not tainted 5.5.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
print_bad_irq_dependency kernel/locking/lockdep.c:2094 [inline]
check_irq_usage.cold+0x586/0x6fe kernel/locking/lockdep.c:2292
check_prev_add kernel/locking/lockdep.c:2479 [inline]
check_prevs_add kernel/locking/lockdep.c:2580 [inline]
validate_chain kernel/locking/lockdep.c:2970 [inline]
__lock_acquire+0x25b4/0x4a00 kernel/locking/lockdep.c:3954
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:338 [inline]
sidtab_sid2str_put.part.0+0x36/0x880 security/selinux/ss/sidtab.c:533
sidtab_sid2str_put security/selinux/ss/sidtab.c:594 [inline]
sidtab_sid2str_get+0x3b5/0x66e security/selinux/ss/sidtab.c:594
sidtab_entry_to_string+0x37/0x110 security/selinux/ss/services.c:1271
security_sid_to_context_core+0x2c6/0x3c0 security/selinux/ss/services.c:1361
security_sid_to_context+0x34/0x40 security/selinux/ss/services.c:1384
selinux_secid_to_secctx+0x2d/0x40 security/selinux/hooks.c:6451
security_secid_to_secctx+0x75/0xc0 security/security.c:1950
ctnetlink_dump_secctx.isra.0+0x8c/0x330 net/netfilter/nf_conntrack_netlink.c:335
ctnetlink_dump_info net/netfilter/nf_conntrack_netlink.c:531 [inline]
ctnetlink_fill_info+0x750/0xd40 net/netfilter/nf_conntrack_netlink.c:591
ctnetlink_dump_table+0x68c/0x1130 net/netfilter/nf_conntrack_netlink.c:979
netlink_dump+0x558/0xfb0 net/netlink/af_netlink.c:2244
__netlink_dump_start+0x66a/0x930 net/netlink/af_netlink.c:2352
netlink_dump_start include/linux/netlink.h:233 [inline]
ctnetlink_get_conntrack+0x55e/0x6a0 net/netfilter/nf_conntrack_netlink.c:1355
nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0x58c/0x7d0 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:639 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:659
____sys_sendmsg+0x753/0x880 net/socket.c:2330
___sys_sendmsg+0x100/0x170 net/socket.c:2384
__sys_sendmsg+0x105/0x1d0 net/socket.c:2417
__do_sys_sendmsg net/socket.c:2426 [inline]
__se_sys_sendmsg net/socket.c:2424 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2424
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b3f9
Code: bd b1 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 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbe326f8c88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000072bf00 RCX: 000000000045b3f9
RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000003
RBP: 00007fbe326f96d4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008f1 R14: 00000000004ba9a8 R15: 00000000006eaa80

---
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