./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3875723997 <...> Warning: Permanently added '10.128.1.152' (ED25519) to the list of known hosts. execve("./syz-executor3875723997", ["./syz-executor3875723997"], 0x7ffdd1f39970 /* 10 vars */) = 0 brk(NULL) = 0x55555d3db000 brk(0x55555d3dbd00) = 0x55555d3dbd00 arch_prctl(ARCH_SET_FS, 0x55555d3db380) = 0 set_tid_address(0x55555d3db650) = 290 set_robust_list(0x55555d3db660, 24) = 0 rseq(0x55555d3dbca0, 0x20, 0, 0x53053053) = -1 ENOSYS (Function not implemented) prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3875723997", 4096) = 28 getrandom("\xd2\x5d\x44\x0b\x53\xec\xc4\xe4", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555d3dbd00 brk(0x55555d3fcd00) = 0x55555d3fcd00 brk(0x55555d3fd000) = 0x55555d3fd000 mprotect(0x7fdd8e942000, 16384, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 write(1, "executing program\n", 18executing program ) = 18 memfd_create("syzkaller", 0) = 3 mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdd86492000 write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 262144) = 262144 munmap(0x7fdd86492000, 138412032) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 close(4) = 0 mkdir("./file2", 0777) = 0 [ 25.263663][ T28] audit: type=1400 audit(1754244809.330:64): avc: denied { execmem } for pid=290 comm="syz-executor387" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 25.267973][ T290] loop0: detected capacity change from 0 to 512 [ 25.284040][ T28] audit: type=1400 audit(1754244809.330:65): avc: denied { read write } for pid=290 comm="syz-executor387" name="loop0" dev="devtmpfs" ino=118 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 [ 25.300118][ T290] EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, O_DIRECT and fast_commit support! [ 25.318099][ T28] audit: type=1400 audit(1754244809.330:66): avc: denied { open } for pid=290 comm="syz-executor387" path="/dev/loop0" dev="devtmpfs" ino=118 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 [ 25.327239][ T290] EXT4-fs (loop0): encrypted files will use data=ordered instead of data journaling mode [ 25.351552][ T28] audit: type=1400 audit(1754244809.330:67): avc: denied { ioctl } for pid=290 comm="syz-executor387" path="/dev/loop0" dev="devtmpfs" ino=118 ioctlcmd=0x4c00 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 [ 25.379575][ T290] EXT4-fs warning (device loop0): ext4_expand_extra_isize_ea:2818: Unable to expand inode 15. Delete some EAs or run e2fsck. mount("/dev/loop0", "./file2", "ext4", MS_NOEXEC|MS_DIRSYNC, "nogrpid,min_batch_time=0x0000000000000000,debug_want_extra_isize=0x0000000000000068,nobarrier,nodisc"...) = 0 openat(AT_FDCWD, "./file2", O_RDONLY|O_DIRECTORY) = 3 chdir("./file2") = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_CLR_FD) = 0 close(4) = 0 truncate("./file2", 0) = 0 lsetxattr("./file1", "trusted.overlay.upper", "\x00\xfb\xcd\x01\x3f\x33\x35\x63\x95\x7f\xde\x9e\x67\x6b\xcf\x88\x1c\xf4\xba\x91\x30\x9a\x6d\x2b\xa0\x67\x6a\x2d\x00\x0e\x48\x2d\xd7\xed\x5c\x99\x9c\x1f\x11\xb1\xf4\x90\x96\xcf\x50\x67\xf6\x75\xf2\xf8\xb3\xd9\x4b\x6b\x40\x8a\x3d\xad\xb6\xeb\x64\x0b\x03\x61\xfa\xf5\xda\xde\x5b\xc7\x73\xd7\xe3\x09\x52\xf3\xe8\x28\xc4\x31\xbf\xf0\x11\xc4\x52\xa2\x9c\xa1\x71\x13\x0e\x5d\x9c\x2f\xd8\x35\x44\x28\x94\x09"..., 205, 0) = 0 [ 25.386602][ T28] audit: type=1400 audit(1754244809.370:68): avc: denied { mounton } for pid=290 comm="syz-executor387" path="/root/file2" dev="sda1" ino=2024 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1 [ 25.399883][ T290] EXT4-fs (loop0): 1 truncate cleaned up [ 25.427866][ T290] EXT4-fs (loop0): mounted filesystem without journal. Quota mode: writeback. [ 25.436969][ T28] audit: type=1400 audit(1754244809.500:69): avc: denied { mount } for pid=290 comm="syz-executor387" name="/" dev="loop0" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fs_t tclass=filesystem permissive=1 [ 25.442563][ T290] ================================================================== [ 25.466863][ T290] BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xaf2/0x21d0 [ 25.469795][ T28] audit: type=1400 audit(1754244809.500:70): avc: denied { write } for pid=290 comm="syz-executor387" name="file2" dev="loop0" ino=16 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=file permissive=1 [ 25.474634][ T290] Read of size 18446744073709551540 at addr ffff888109df0870 by task syz-executor387/290 [ 25.497093][ T28] audit: type=1400 audit(1754244809.500:71): avc: denied { open } for pid=290 comm="syz-executor387" name="file2" dev="loop0" ino=16 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=file permissive=1 [ 25.506762][ T290] [ 25.506781][ T290] CPU: 0 PID: 290 Comm: syz-executor387 Not tainted 6.1.145-syzkaller-00038-g3b4ff5af8d36 #0 [ 25.506804][ T290] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 25.529100][ T28] audit: type=1400 audit(1754244809.500:72): avc: denied { setattr } for pid=290 comm="syz-executor387" name="file1" dev="loop0" ino=15 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=file permissive=1 [ 25.531357][ T290] Call Trace: [ 25.577382][ T290] [ 25.580318][ T290] __dump_stack+0x21/0x24 [ 25.584651][ T290] dump_stack_lvl+0xee/0x150 [ 25.589251][ T290] ? __cfi_dump_stack_lvl+0x8/0x8 [ 25.594280][ T290] ? ext4_xattr_block_set+0x9dc/0x3270 [ 25.599757][ T290] ? __vfs_setxattr+0x3f2/0x440 [ 25.604670][ T290] ? ext4_xattr_set_entry+0xaf2/0x21d0 [ 25.610149][ T290] print_address_description+0x71/0x210 [ 25.615720][ T290] print_report+0x4a/0x60 [ 25.620052][ T290] kasan_report+0x122/0x150 [ 25.624573][ T290] ? ext4_xattr_set_entry+0xaf2/0x21d0 [ 25.630056][ T290] ? ext4_xattr_set_entry+0xaf2/0x21d0 [ 25.635548][ T290] kasan_check_range+0x280/0x290 [ 25.640512][ T290] memmove+0x2d/0x70 [ 25.644415][ T290] ext4_xattr_set_entry+0xaf2/0x21d0 [ 25.649708][ T290] ext4_xattr_block_set+0xada/0x3270 [ 25.655010][ T290] ? inode_add_lru+0x20/0x20 [ 25.659620][ T290] ? _raw_spin_unlock+0x4c/0x70 [ 25.664477][ T290] ? iput+0x543/0x670 [ 25.668493][ T290] ? ext4_xattr_block_find+0x310/0x310 [ 25.673965][ T290] ext4_xattr_set_handle+0xba5/0x12b0 [ 25.679350][ T290] ? __cfi_ext4_xattr_set_handle+0x10/0x10 [ 25.685162][ T290] ? __kasan_check_read+0x11/0x20 [ 25.690205][ T290] ? __ext4_journal_start_sb+0x2ed/0x4a0 [ 25.695860][ T290] ext4_xattr_set+0x22a/0x320 [ 25.700546][ T290] ? __cfi_ext4_xattr_set+0x10/0x10 [ 25.705836][ T290] ? selinux_inode_setxattr+0x5aa/0xba0 [ 25.711476][ T290] ext4_xattr_trusted_set+0x3c/0x50 [ 25.716707][ T290] ? __cfi_ext4_xattr_trusted_set+0x10/0x10 [ 25.722640][ T290] __vfs_setxattr+0x3f2/0x440 [ 25.727332][ T290] __vfs_setxattr_noperm+0x12a/0x5e0 [ 25.732647][ T290] __vfs_setxattr_locked+0x212/0x230 [ 25.738027][ T290] vfs_setxattr+0x168/0x2f0 [ 25.742617][ T290] ? __cfi_vfs_setxattr+0x10/0x10 [ 25.747766][ T290] ? copy_user_enhanced_fast_string+0xa/0x40 [ 25.753759][ T290] setxattr+0x2b2/0x2d0 [ 25.758092][ T290] ? path_setxattr+0x280/0x280 [ 25.762961][ T290] ? __mnt_want_write+0x1e6/0x260 [ 25.768075][ T290] ? mnt_want_write+0x220/0x300 [ 25.772927][ T290] path_setxattr+0x142/0x280 [ 25.777538][ T290] ? simple_xattr_list_add+0x120/0x120 [ 25.783019][ T290] ? fpregs_restore_userregs+0x128/0x260 [ 25.788652][ T290] __x64_sys_lsetxattr+0xc2/0xe0 [ 25.793593][ T290] x64_sys_call+0x8b7/0x9a0 [ 25.798098][ T290] do_syscall_64+0x4c/0xa0 [ 25.802513][ T290] ? clear_bhb_loop+0x30/0x80 [ 25.807190][ T290] ? clear_bhb_loop+0x30/0x80 [ 25.811895][ T290] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 25.817796][ T290] RIP: 0033:0x7fdd8e8cfbb9 [ 25.822221][ T290] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 25.841824][ T290] RSP: 002b:00007ffca850e908 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd [ 25.850322][ T290] RAX: ffffffffffffffda RBX: 0072657070752e79 RCX: 00007fdd8e8cfbb9 [ 25.858297][ T290] RDX: 0000200000000040 RSI: 00002000000000c0 RDI: 0000200000000100 [ 25.866622][ T290] RBP: 0031656c69662f2e R08: 0000000000000000 R09: 0000000000000000 [ 25.874596][ T290] R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000001 [ 25.882575][ T290] R13: 00007ffca850eae8 R14: 0000000000000001 R15: 0000000000000001 [ 25.890553][ T290] [ 25.893568][ T290] [ 25.895898][ T290] Allocated by task 290: [ 25.900177][ T290] kasan_set_track+0x4b/0x70 [ 25.904774][ T290] kasan_save_alloc_info+0x25/0x30 [ 25.909890][ T290] __kasan_kmalloc+0x95/0xb0 [ 25.914489][ T290] __kmalloc_node_track_caller+0xb1/0x1e0 [ 25.920314][ T290] kmemdup+0x2b/0x60 [ 25.924231][ T290] ext4_xattr_block_set+0x9dc/0x3270 [ 25.929538][ T290] ext4_xattr_set_handle+0xba5/0x12b0 [ 25.934922][ T290] ext4_xattr_set+0x22a/0x320 [ 25.939605][ T290] ext4_xattr_trusted_set+0x3c/0x50 [ 25.944809][ T290] __vfs_setxattr+0x3f2/0x440 [ 25.949501][ T290] __vfs_setxattr_noperm+0x12a/0x5e0 [ 25.954809][ T290] __vfs_setxattr_locked+0x212/0x230 [ 25.960285][ T290] vfs_setxattr+0x168/0x2f0 [ 25.964810][ T290] setxattr+0x2b2/0x2d0 [ 25.968980][ T290] path_setxattr+0x142/0x280 [ 25.973586][ T290] __x64_sys_lsetxattr+0xc2/0xe0 [ 25.978624][ T290] x64_sys_call+0x8b7/0x9a0 [ 25.983166][ T290] do_syscall_64+0x4c/0xa0 [ 25.987602][ T290] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 25.993506][ T290] [ 25.995822][ T290] The buggy address belongs to the object at ffff888109df0800 [ 25.995822][ T290] which belongs to the cache kmalloc-1k of size 1024 [ 26.009866][ T290] The buggy address is located 112 bytes inside of [ 26.009866][ T290] 1024-byte region [ffff888109df0800, ffff888109df0c00) [ 26.023405][ T290] [ 26.025743][ T290] The buggy address belongs to the physical page: [ 26.032149][ T290] page:ffffea0004277c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109df0 [ 26.042491][ T290] head:ffffea0004277c00 order:3 compound_mapcount:0 compound_pincount:0 [ 26.050825][ T290] flags: 0x4000000000010200(slab|head|zone=1) [ 26.056910][ T290] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100043080 [ 26.065491][ T290] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.074068][ T290] page dumped because: kasan: bad access detected [ 26.080497][ T290] page_owner tracks the page as allocated [ 26.086295][ T290] page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 286, tgid 286 (sshd-session), ts 25262950202, free_ts 25261505658 [ 26.107569][ T290] post_alloc_hook+0x1f5/0x210 [ 26.112340][ T290] prep_new_page+0x1c/0x110 [ 26.116848][ T290] get_page_from_freelist+0x2c7b/0x2cf0 [ 26.122581][ T290] __alloc_pages+0x1c3/0x450 [ 26.127181][ T290] alloc_slab_page+0x6e/0xf0 [ 26.131774][ T290] new_slab+0x98/0x3d0 [ 26.135842][ T290] ___slab_alloc+0x6f6/0xb50 [ 26.140435][ T290] __slab_alloc+0x5e/0xa0 [ 26.144771][ T290] __kmem_cache_alloc_node+0x203/0x2c0 [ 26.150239][ T290] __kmalloc_node_track_caller+0xa0/0x1e0 [ 26.156086][ T290] __alloc_skb+0x236/0x4b0 [ 26.160514][ T290] tcp_stream_alloc_skb+0x47/0x360 [ 26.165632][ T290] tcp_sendmsg_locked+0xd10/0x3d90 [ 26.171007][ T290] tcp_sendmsg+0x2f/0x50 [ 26.175246][ T290] inet_sendmsg+0xb6/0xd0 [ 26.179602][ T290] sock_write_iter+0x2ca/0x3b0 [ 26.184385][ T290] page last free stack trace: [ 26.189132][ T290] free_unref_page_prepare+0x742/0x750 [ 26.194592][ T290] free_unref_page+0x8f/0x530 [ 26.199269][ T290] free_compound_page+0x99/0xd0 [ 26.204119][ T290] destroy_large_folio+0x68/0xa0 [ 26.209073][ T290] __folio_put+0xd1/0xe0 [ 26.213323][ T290] page_to_skb+0x4ad/0xb90 [ 26.217752][ T290] receive_buf+0x435/0x4760 [ 26.222257][ T290] virtnet_poll+0x5af/0x1150 [ 26.226843][ T290] __napi_poll+0xd0/0x5e0 [ 26.231173][ T290] net_rx_action+0x49b/0xaa0 [ 26.235820][ T290] handle_softirqs+0x1d7/0x600 [ 26.240583][ T290] __irq_exit_rcu+0x52/0xf0 [ 26.245089][ T290] irq_exit_rcu+0x9/0x10 [ 26.249332][ T290] common_interrupt+0x64/0xe0 [ 26.254009][ T290] asm_common_interrupt+0x27/0x40 [ 26.259120][ T290] [ 26.261436][ T290] Memory state around the buggy address: [ 26.267078][ T290] ffff888109df0700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.275139][ T290] ffff888109df0780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.283207][ T290] >ffff888109df0800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 26.291280][ T290] ^ [ 26.298996][ T290] ffff888109df0880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 26.307055][ T290] ffff888109df0900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 lsetxattr("./file1", "trusted.overlay.upper", "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 65079, 0) = 0 exit_group(0) = ? +++ exited with 0 +++ [ 26.315121][ T290] =====================