================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xfc8/0x15ac fs/ext4/xattr.c:1699 Read of size 18446744073709550592 at addr ffff0000c3e95c00 by task syz.1.447/6621 CPU: 0 PID: 6621 Comm: syz.1.447 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0x100 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x260/0x2a0 mm/kasan/generic.c:189 memmove+0x48/0x90 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0xfc8/0x15ac fs/ext4/xattr.c:1699 ext4_xattr_block_set+0x614/0x2810 fs/ext4/xattr.c:1989 ext4_xattr_set_handle+0xa0c/0x102c fs/ext4/xattr.c:2414 ext4_xattr_set+0x1e0/0x2b4 fs/ext4/xattr.c:2516 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x228/0x28c fs/xattr.c:617 path_setxattr+0x12c/0x25c fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 6621: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xe0/0x16c mm/slab_common.c:956 kmemdup+0x5c/0x98 mm/util.c:129 kmemdup include/linux/fortify-string.h:585 [inline] ext4_xattr_block_set+0x558/0x2810 fs/ext4/xattr.c:1937 ext4_xattr_set_handle+0xa0c/0x102c fs/ext4/xattr.c:2414 ext4_xattr_set+0x1e0/0x2b4 fs/ext4/xattr.c:2516 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x228/0x28c fs/xattr.c:617 path_setxattr+0x12c/0x25c fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 insert_work+0x64/0x37c kernel/workqueue.c:1361 __queue_work+0xcbc/0x123c kernel/workqueue.c:1520 queue_work_on+0xc0/0x16c kernel/workqueue.c:1548 queue_work include/linux/workqueue.h:512 [inline] xlog_bio_end_io+0x84/0x98 fs/xfs/xfs_log.c:1842 bio_endio+0x770/0x7b4 block/bio.c:1554 req_bio_endio block/blk-mq.c:780 [inline] blk_update_request+0x49c/0xbec block/blk-mq.c:925 blk_mq_end_request+0x54/0x88 block/blk-mq.c:1050 blk_flush_complete_seq+0x4f4/0xa78 block/blk-flush.c:210 flush_end_io+0x790/0xa58 block/blk-flush.c:268 __blk_mq_end_request+0x358/0x438 block/blk-mq.c:1040 blk_mq_end_request+0x68/0x88 block/blk-mq.c:1052 lo_complete_rq+0x1ec/0x250 drivers/block/loop.c:365 blk_complete_reqs block/blk-mq.c:1130 [inline] blk_done_softirq+0x11c/0x168 block/blk-mq.c:1135 handle_softirqs+0x318/0xc6c kernel/softirq.c:596 run_ksoftirqd+0x7c/0x2a0 kernel/softirq.c:963 smpboot_thread_fn+0x4b0/0x964 kernel/smpboot.c:164 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 The buggy address belongs to the object at ffff0000c3e95800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 0 bytes to the right of 1024-byte region [ffff0000c3e95800, ffff0000c3e95c00) The buggy address belongs to the physical page: page:00000000e01386e6 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000c3e97000 pfn:0x103e90 head:00000000e01386e6 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002780 raw: ffff0000c3e97000 000000008010000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c3e95b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000c3e95b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000c3e95c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000c3e95c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000c3e95d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================