================================================================== BUG: KASAN: slab-use-after-free in ecryptfs_write_tag_70_packet+0x1241/0x12e0 fs/ecryptfs/keystore.c:742 Read of size 4 at addr ffff888027d29898 by task syz.1.2087/12278 CPU: 0 UID: 0 PID: 12278 Comm: syz.1.2087 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 ecryptfs_write_tag_70_packet+0x1241/0x12e0 fs/ecryptfs/keystore.c:742 ecryptfs_encrypt_filename fs/ecryptfs/crypto.c:1378 [inline] ecryptfs_encrypt_and_encode_filename+0x576/0x1580 fs/ecryptfs/crypto.c:1789 ecryptfs_lookup+0x20e/0x780 fs/ecryptfs/inode.c:402 lookup_open+0x94b/0x1970 fs/namei.c:4559 open_last_lookups fs/namei.c:4798 [inline] path_openat+0x673/0x1da0 fs/namei.c:5037 do_file_open+0x23e/0x4a0 fs/namei.c:5069 do_sys_openat2+0x115/0x200 fs/open.c:1442 do_sys_open fs/open.c:1448 [inline] __do_sys_openat fs/open.c:1464 [inline] __se_sys_openat fs/open.c:1459 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1459 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f759cb9e199 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f759daef028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f759ce25fa0 RCX: 00007f759cb9e199 RDX: 0000000000042480 RSI: 0000200000000340 RDI: 0000000000000004 RBP: 00007f759cc358e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000151 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f759ce26038 R14: 00007f759ce25fa0 R15: 00007fffb1981e88 Allocated by task 12096: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5531 [inline] __kmalloc_noprof+0x366/0x710 mm/slub.c:5556 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] iter_file_splice_write+0x1ea/0x1240 fs/splice.c:678 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x101/0x160 fs/splice.c:1187 splice_direct_to_actor+0x57b/0xcb0 fs/splice.c:1096 do_splice_direct_actor fs/splice.c:1230 [inline] do_splice_direct+0x195/0x290 fs/splice.c:1256 do_sendfile+0x52e/0x7c0 fs/read_write.c:1371 __do_sys_sendfile64 fs/read_write.c:1426 [inline] __se_sys_sendfile64+0xdf/0x1a0 fs/read_write.c:1418 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 12096: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2780 [inline] slab_free mm/slub.c:6630 [inline] kfree+0x1c5/0x650 mm/slub.c:6923 iter_file_splice_write+0x109f/0x1240 fs/splice.c:768 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x101/0x160 fs/splice.c:1187 splice_direct_to_actor+0x57b/0xcb0 fs/splice.c:1096 do_splice_direct_actor fs/splice.c:1230 [inline] do_splice_direct+0x195/0x290 fs/splice.c:1256 do_sendfile+0x52e/0x7c0 fs/read_write.c:1371 __do_sys_sendfile64 fs/read_write.c:1426 [inline] __se_sys_sendfile64+0xdf/0x1a0 fs/read_write.c:1418 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888027d29800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 152 bytes inside of freed 256-byte region [ffff888027d29800, ffff888027d29900) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888027d28400 pfn:0x27d28 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88813ff24b40 ffffea0000c75c10 ffffea0001da6d10 raw: ffff888027d28400 000000000010000e 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88813ff24b40 ffffea0000c75c10 ffffea0001da6d10 head: ffff888027d28400 000000000010000e 00000000f5000000 0000000000000000 head: 00fff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6634, tgid 6633 (syz.3.307), ts 116871817581 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1854 prep_new_page mm/page_alloc.c:1862 [inline] get_page_from_freelist+0x220f/0x2280 mm/page_alloc.c:3933 __alloc_frozen_pages_noprof+0x1fc/0x400 mm/page_alloc.c:5471 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab+0x7d/0x5e0 mm/slub.c:3499 new_slab mm/slub.c:3550 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] __kmalloc_cache_noprof+0x396/0x600 mm/slub.c:5676 _kmalloc_noprof include/linux/slab.h:991 [inline] __io_getxattr_prep io_uring/xattr.c:59 [inline] io_getxattr_prep+0x1dc/0x320 io_uring/xattr.c:88 io_init_req io_uring/io_uring.c:1883 [inline] io_submit_sqe io_uring/io_uring.c:1930 [inline] io_submit_sqes+0xbde/0x2310 io_uring/io_uring.c:2098 __do_sys_io_uring_enter io_uring/io_uring.c:2774 [inline] __se_sys_io_uring_enter+0x35b/0x1bb0 io_uring/io_uring.c:2723 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 15 tgid 15 ts 113284474831 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1401 [inline] __free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2952 rcu_do_batch kernel/rcu/tree.c:2650 [inline] rcu_core+0x92e/0x1230 kernel/rcu/tree.c:2919 handle_softirqs+0x223/0x840 kernel/softirq.c:645 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1099 smpboot_thread_fn+0x5f8/0xb30 kernel/smpboot.c:162 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888027d29780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027d29800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888027d29880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027d29900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027d29980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================