================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x979/0x21d0 fs/ext4/xattr.c:1742 Read of size 18446744073709551588 at addr ffff88810d52e040 by task syz.1.76/620 CPU: 0 PID: 620 Comm: syz.1.76 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x979/0x21d0 fs/ext4/xattr.c:1742 ext4_xattr_block_set+0xad3/0x3260 fs/ext4/xattr.c:1989 ext4_xattr_set_handle+0xbc4/0x12c0 fs/ext4/xattr.c:2414 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2516 ext4_xattr_security_set+0x3c/0x50 fs/ext4/xattr_security.c:31 __vfs_setxattr+0x3f2/0x440 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277 vfs_setxattr+0x167/0x2e0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x346/0x360 fs/xattr.c:617 path_setxattr+0x147/0x290 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __x64_sys_setxattr+0xc5/0xe0 fs/xattr.c:648 x64_sys_call+0x633/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:189 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fdaaef9acb9 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:00007fdaafeac028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007fdaaf215fa0 RCX: 00007fdaaef9acb9 RDX: 0000200000000880 RSI: 0000200000000080 RDI: 0000200000000100 RBP: 00007fdaaf008bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdaaf216038 R14: 00007fdaaf215fa0 R15: 00007ffc6da4d7a8 Allocated by task 620: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:388 kasan_kmalloc include/linux/kasan.h:212 [inline] __do_kmalloc_node mm/slab_common.c:938 [inline] __kmalloc_node_track_caller+0xb1/0x1e0 mm/slab_common.c:958 kmemdup+0x2b/0x60 mm/util.c:134 kmemdup include/linux/fortify-string.h:585 [inline] ext4_xattr_block_set+0x9d5/0x3260 fs/ext4/xattr.c:1937 ext4_xattr_set_handle+0xbc4/0x12c0 fs/ext4/xattr.c:2414 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2516 ext4_xattr_security_set+0x3c/0x50 fs/ext4/xattr_security.c:31 __vfs_setxattr+0x3f2/0x440 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277 vfs_setxattr+0x167/0x2e0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x346/0x360 fs/xattr.c:617 path_setxattr+0x147/0x290 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __x64_sys_setxattr+0xc5/0xe0 fs/xattr.c:648 x64_sys_call+0x633/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:189 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88810d52e000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 64 bytes inside of 1024-byte region [ffff88810d52e000, ffff88810d52e400) The buggy address belongs to the physical page: page:ffffea0004354a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88810d52e800 pfn:0x10d528 head:ffffea0004354a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000001 ffff888100043080 raw: ffff88810d52e800 000000008010000a 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2000(__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 2622395942, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2643 prep_new_page+0x1c/0x110 mm/page_alloc.c:2650 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4554 __alloc_pages+0x1d9/0x480 mm/page_alloc.c:5868 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3d0 mm/slub.c:2020 ___slab_alloc+0x6bd/0xb20 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc_node+0xa1/0x1e0 mm/slab_common.c:945 kmalloc_node include/linux/slab.h:589 [inline] kzalloc_node include/linux/slab.h:710 [inline] blk_alloc_flush_queue+0xf7/0x270 block/blk-flush.c:484 blk_mq_alloc_hctx block/blk-mq.c:3752 [inline] blk_mq_alloc_and_init_hctx+0x814/0xe50 block/blk-mq.c:4191 blk_mq_realloc_hw_ctxs+0x181/0x420 block/blk-mq.c:4224 blk_mq_init_allocated_queue+0x50e/0x1700 block/blk-mq.c:4286 blk_mq_init_queue_data block/blk-mq.c:4096 [inline] blk_mq_init_queue+0xa6/0x120 block/blk-mq.c:4106 scsi_alloc_sdev+0x6a0/0xac0 drivers/scsi/scsi_scan.c:335 page_owner free stack trace missing Memory state around the buggy address: ffff88810d52df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88810d52df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88810d52e000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88810d52e080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810d52e100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================