================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x13a3/0x37d0 fs/ext4/xattr.c:1748 Read of size 18446744073709551540 at addr ffff888113137870 by task syz.2.17/480 CPU: 1 PID: 480 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x280/0x290 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x13a3/0x37d0 fs/ext4/xattr.c:1748 ext4_xattr_block_set+0x8cd/0x2cb0 fs/ext4/xattr.c:2005 ext4_xattr_set_handle+0xba5/0x12b0 fs/ext4/xattr.c:2413 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2523 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3e1/0x430 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277 vfs_setxattr+0x168/0x2f0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x2da/0x300 fs/xattr.c:611 path_setxattr+0x142/0x280 fs/xattr.c:630 __do_sys_lsetxattr fs/xattr.c:653 [inline] __se_sys_lsetxattr fs/xattr.c:649 [inline] __x64_sys_lsetxattr+0xc2/0xe0 fs/xattr.c:649 x64_sys_call+0x8cc/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:190 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fbc8c91bec9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbc8c78c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007fbc8cb72fa0 RCX: 00007fbc8c91bec9 RDX: 0000200000000040 RSI: 00002000000000c0 RDI: 0000200000000100 RBP: 00007fbc8c99ef91 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbc8cb73038 R14: 00007fbc8cb72fa0 R15: 00007ffe70cf50f8 Allocated by task 480: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc_track_caller+0x13c/0x2c0 mm/slub.c:4959 kmemdup+0x26/0x60 mm/util.c:132 ext4_xattr_block_set+0x7e2/0x2cb0 fs/ext4/xattr.c:1953 ext4_xattr_set_handle+0xba5/0x12b0 fs/ext4/xattr.c:2413 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2523 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3e1/0x430 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277 vfs_setxattr+0x168/0x2f0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x2da/0x300 fs/xattr.c:611 path_setxattr+0x142/0x280 fs/xattr.c:630 __do_sys_lsetxattr fs/xattr.c:653 [inline] __se_sys_lsetxattr fs/xattr.c:649 [inline] __x64_sys_lsetxattr+0xc2/0xe0 fs/xattr.c:649 x64_sys_call+0x8cc/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:190 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888113137800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 112 bytes inside of 1024-byte region [ffff888113137800, ffff888113137c00) The buggy address belongs to the page: page:ffffea00044c4c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888113130800 pfn:0x113130 head:ffffea00044c4c00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100043080 raw: ffff888113130800 000000008010000f 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 112, ts 6654381709, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5808 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa1/0x4d0 mm/slub.c:2000 ___slab_alloc+0x381/0x810 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x21a/0x740 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] alloc_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline] kobject_uevent_net_broadcast+0x335/0x5a0 lib/kobject_uevent.c:409 kobject_uevent_env+0x52e/0x700 lib/kobject_uevent.c:608 kobject_synth_uevent+0x520/0xaf0 lib/kobject_uevent.c:208 uevent_store+0x25/0x60 drivers/base/core.c:2438 dev_attr_store+0x5e/0x80 drivers/base/core.c:2136 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:139 page_owner free stack trace missing Memory state around the buggy address: ffff888113137700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888113137780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888113137800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888113137880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888113137900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================