syzbot

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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1783
Read of size 18446744073709551588 at addr ffff8880354f1040 by task syz.0.299/6709

CPU: 0 UID: 0 PID: 6709 Comm: syz.0.299 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1783
 ext4_xattr_block_set+0x878/0x2ad0 fs/ext4/xattr.c:2030
 ext4_xattr_set_handle+0xe34/0x14c0 fs/ext4/xattr.c:2457
 ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2559
 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
 vfs_setxattr+0x163/0x360 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x296/0x630 fs/xattr.c:664
 path_setxattrat+0x3eb/0x440 fs/xattr.c:708
 __do_sys_setxattr fs/xattr.c:742 [inline]
 __se_sys_setxattr fs/xattr.c:738 [inline]
 __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f099879c799
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:00007ffedaaf2f98 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f0998a15fa0 RCX: 00007f099879c799
RDX: 00002000000013c0 RSI: 0000200000000140 RDI: 0000200000000100
RBP: 00007f0998832c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0998a15fac R14: 00007f0998a15fa0 R15: 00007f0998a15fa0
 </TASK>

Allocated by task 6709:
 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:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5260 [inline]
 __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5368
 kmemdup_noprof+0x2b/0x70 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:763 [inline]
 ext4_xattr_block_set+0x787/0x2ad0 fs/ext4/xattr.c:1978
 ext4_xattr_set_handle+0xe34/0x14c0 fs/ext4/xattr.c:2457
 ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2559
 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
 vfs_setxattr+0x163/0x360 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x296/0x630 fs/xattr.c:664
 path_setxattrat+0x3eb/0x440 fs/xattr.c:708
 __do_sys_setxattr fs/xattr.c:742 [inline]
 __se_sys_setxattr fs/xattr.c:738 [inline]
 __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880354f1000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 64 bytes inside of
 1024-byte region [ffff8880354f1000, ffff8880354f1400)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x354f0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813fea5dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813fea5dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000d53c01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
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 1, tgid 1 (swapper/0), ts 21866502100, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3292 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3481
 new_slab mm/slub.c:3539 [inline]
 refill_objects+0x331/0x3c0 mm/slub.c:7175
 refill_sheaf mm/slub.c:2812 [inline]
 __pcs_replace_empty_main+0x2e6/0x730 mm/slub.c:4615
 alloc_from_pcs mm/slub.c:4717 [inline]
 slab_alloc_node mm/slub.c:4851 [inline]
 __do_kmalloc_node mm/slub.c:5259 [inline]
 __kmalloc_node_track_caller_noprof+0x572/0x7b0 mm/slub.c:5368
 __do_krealloc mm/slub.c:6630 [inline]
 krealloc_node_align_noprof+0x1ae/0x390 mm/slub.c:6689
 add_sysfs_param+0xd4/0xb80 kernel/params.c:648
 kernel_add_sysfs_param+0x7f/0xe0 kernel/params.c:806
 param_sysfs_builtin+0x199/0x250 kernel/params.c:845
 param_sysfs_builtin_init+0x23/0x30 kernel/params.c:981
 do_one_initcall+0x250/0x8d0 init/main.c:1382
 do_initcall_level+0x104/0x190 init/main.c:1444
 do_initcalls+0x59/0xa0 init/main.c:1460
 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1692
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8880354f0f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880354f0f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880354f1000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                           ^
 ffff8880354f1080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880354f1100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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