x_tables: ip6_tables: SYNPROXY target: used from hooks PREROUTING, but only usable from INPUT/FORWARD ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/14347 is trying to acquire lock: 000000003247fa32 (&ovl_i_mutex_key[depth]){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] 000000003247fa32 (&ovl_i_mutex_key[depth]){+.+.}, at: process_measurement+0x926/0x1440 security/integrity/ima/ima_main.c:205 but task is already holding lock: 000000002bb01a73 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 000000002bb01a73 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&sig->cred_guard_mutex){+.+.}: do_io_accounting fs/proc/base.c:2750 [inline] proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (&p->lock){+.+.}: seq_read+0x6b/0x11c0 fs/seq_file.c:164 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 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x457/0xa00 fs/splice.c:417 do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (sb_writers#7){.+.+}: file_start_write include/linux/fs.h:2779 [inline] ovl_write_iter+0x932/0xb40 fs/overlayfs/file.c:282 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&ovl_i_mutex_key[depth]){+.+.}: down_write+0x34/0x90 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:748 [inline] process_measurement+0x926/0x1440 security/integrity/ima/ima_main.c:205 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391 do_last fs/namei.c:3425 [inline] path_openat+0x7e4/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_open_execat+0x11d/0x5b0 fs/exec.c:853 __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: &ovl_i_mutex_key[depth] --> &p->lock --> &sig->cred_guard_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sig->cred_guard_mutex); lock(&p->lock); lock(&sig->cred_guard_mutex); lock(&ovl_i_mutex_key[depth]); *** DEADLOCK *** 1 lock held by syz-executor.5/14347: #0: 000000002bb01a73 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 000000002bb01a73 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 stack backtrace: CPU: 1 PID: 14347 Comm: syz-executor.5 Not tainted 4.19.211-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/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 down_write+0x34/0x90 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:748 [inline] process_measurement+0x926/0x1440 security/integrity/ima/ima_main.c:205 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391 do_last fs/namei.c:3425 [inline] path_openat+0x7e4/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_open_execat+0x11d/0x5b0 fs/exec.c:853 __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f81f346d109 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f81f1da0168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007f81f3580100 RCX: 00007f81f346d109 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 RBP: 00007f81f34c70ad R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff1add2bef R14: 00007f81f1da0300 R15: 0000000000022000 Invalid argument reading file caps for ./file0 x_tables: ip6_tables: SYNPROXY target: used from hooks PREROUTING, but only usable from INPUT/FORWARD overlayfs: failed to resolve './file1': -2 overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 kauditd_printk_skb: 3 callbacks suppressed audit: type=1804 audit(1654849738.187:1031): pid=14362 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir144122028/syzkaller.SQhxDs/1061/file0" dev="sda1" ino=14017 res=1 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 x_tables: ip6_tables: SYNPROXY target: used from hooks PREROUTING, but only usable from INPUT/FORWARD Invalid argument reading file caps for ./file0 netlink: 'syz-executor.5': attribute type 10 has an invalid length. team0: Device veth0_macvtap is up. Set it down before adding it as a team port netlink: 'syz-executor.5': attribute type 10 has an invalid length. team0: Device veth0_macvtap is up. Set it down before adding it as a team port netlink: 'syz-executor.5': attribute type 10 has an invalid length. team0: Cannot enslave team device to itself netlink: 'syz-executor.5': attribute type 10 has an invalid length. bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state ieee802154 phy0 wpan0: encryption failed: -22 device team0 entered promiscuous mode ieee802154 phy1 wpan1: encryption failed: -22 device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state netlink: 'syz-executor.5': attribute type 10 has an invalid length. netlink: 'syz-executor.5': attribute type 10 has an invalid length. device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state team0: Cannot enslave team device to itself netlink: 'syz-executor.5': attribute type 10 has an invalid length. team0: Cannot enslave team device to itself netlink: 'syz-executor.5': attribute type 10 has an invalid length. bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state netlink: 'syz-executor.5': attribute type 10 has an invalid length. device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state team0: Cannot enslave team device to itself netlink: 'syz-executor.1': attribute type 10 has an invalid length. team0: Cannot enslave team device to itself bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state team0: Cannot enslave team device to itself team0: Cannot enslave team device to itself team0: Cannot enslave team device to itself team0: Cannot enslave team device to itself team0: Cannot enslave team device to itself team0: Cannot enslave team device to itself device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state team0: Cannot enslave team device to itself team0: Cannot enslave team device to itself team0: Cannot enslave team device to itself bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state team0: Cannot enslave team device to itself device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state team0: Cannot enslave team device to itself bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "lowerd…r=./fi«Jjť‡°le0" or missing value overlayfs: missing 'lowerdir' device team0 left promiscuous mode overlayfs: missing 'lowerdir' device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state team0: Cannot enslave team device to itself bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state team0: Cannot enslave team device to itself bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state team0: Cannot enslave team device to itself bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state team0: Cannot enslave team device to itself bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state validate_nla: 22 callbacks suppressed netlink: 'syz-executor.1': attribute type 10 has an invalid length. device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state team0: Cannot enslave team device to itself netlink: 'syz-executor.1': attribute type 10 has an invalid length. bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state netlink: 'syz-executor.1': attribute type 10 has an invalid length. netlink: 'syz-executor.4': attribute type 10 has an invalid length. device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state team0: Cannot enslave team device to itself netlink: 'syz-executor.1': attribute type 10 has an invalid length. netlink: 'syz-executor.4': attribute type 10 has an invalid length. bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode netlink: 'syz-executor.1': attribute type 10 has an invalid length.