================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x94b/0x1e90 fs/ext4/xattr.c:1795 Read of size 18446744073709551588 at addr ffff888070336840 by task syz.3.871/11136 CPU: 0 PID: 11136 Comm: syz.3.871 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x220 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x288/0x290 mm/kasan/generic.c:187 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 ext4_xattr_set_entry+0x94b/0x1e90 fs/ext4/xattr.c:1795 ext4_xattr_block_set+0xae3/0x32a0 fs/ext4/xattr.c:2042 ext4_xattr_set_handle+0xbff/0x1290 fs/ext4/xattr.c:2467 ext4_xattr_set+0x22d/0x320 fs/ext4/xattr.c:2569 __vfs_setxattr+0x431/0x470 fs/xattr.c:201 __vfs_setxattr_noperm+0x12d/0x5e0 fs/xattr.c:235 vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322 do_setxattr fs/xattr.c:630 [inline] path_setxattr+0x362/0x550 fs/xattr.c:659 __do_sys_setxattr fs/xattr.c:677 [inline] __se_sys_setxattr fs/xattr.c:673 [inline] __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:673 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe3e298f749 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:00007fe3e387a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007fe3e2be5fa0 RCX: 00007fe3e298f749 RDX: 00002000000013c0 RSI: 0000200000000140 RDI: 0000200000000100 RBP: 00007fe3e2a13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe3e2be6038 R14: 00007fe3e2be5fa0 R15: 00007fff541c7388 Allocated by task 11136: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc_node_track_caller+0xb2/0x230 mm/slab_common.c:1027 kmemdup+0x2b/0x70 mm/util.c:131 kmemdup include/linux/fortify-string.h:779 [inline] ext4_xattr_block_set+0x9e5/0x32a0 fs/ext4/xattr.c:1990 ext4_xattr_set_handle+0xbff/0x1290 fs/ext4/xattr.c:2467 ext4_xattr_set+0x22d/0x320 fs/ext4/xattr.c:2569 __vfs_setxattr+0x431/0x470 fs/xattr.c:201 __vfs_setxattr_noperm+0x12d/0x5e0 fs/xattr.c:235 vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322 do_setxattr fs/xattr.c:630 [inline] path_setxattr+0x362/0x550 fs/xattr.c:659 __do_sys_setxattr fs/xattr.c:677 [inline] __se_sys_setxattr fs/xattr.c:673 [inline] __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:673 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888070336800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 64 bytes inside of 1024-byte region [ffff888070336800, ffff888070336c00) The buggy address belongs to the physical page: page:ffffea0001c0cc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x70330 head:ffffea0001c0cc00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888017841dc0 ffffea0001eb5400 dead000000000002 raw: 0000000000000000 0000000080100010 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 10187, tgid 10185 (syz.4.740), ts 434355193694, free_ts 430035684188 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 alloc_slab_page+0x5d/0x170 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2e0 mm/slub.c:2081 ___slab_alloc+0xc6d/0x1300 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3534 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] choose_rate sound/core/oss/pcm_oss.c:795 [inline] snd_pcm_oss_change_params_locked+0xadc/0x3d30 sound/core/oss/pcm_oss.c:904 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1115 [inline] snd_pcm_oss_make_ready+0x11b/0x330 sound/core/oss/pcm_oss.c:1174 snd_pcm_oss_set_trigger+0x95/0x720 sound/core/oss/pcm_oss.c:2091 snd_pcm_oss_poll+0x639/0x890 sound/core/oss/pcm_oss.c:2877 vfs_poll include/linux/poll.h:92 [inline] do_select+0xf72/0x1840 fs/select.c:535 core_sys_select+0x71c/0x950 fs/select.c:678 do_pselect fs/select.c:760 [inline] __do_sys_pselect6 fs/select.c:801 [inline] __se_sys_pselect6+0x285/0x310 fs/select.c:792 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 __slab_free+0x35e/0x410 mm/slub.c:3736 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] __kmem_cache_alloc_node+0x13e/0x260 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0xa4/0x240 mm/slab_common.c:1020 kmalloc_array include/linux/slab.h:637 [inline] memcg_list_lru_alloc+0x1af/0xae0 mm/list_lru.c:487 memcg_slab_pre_alloc_hook mm/slab.h:501 [inline] slab_pre_alloc_hook+0x2b6/0x310 mm/slab.h:719 slab_alloc_node mm/slub.c:3477 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc_lru+0x4d/0x2e0 mm/slub.c:3526 alloc_inode_sb include/linux/fs.h:2946 [inline] alloc_inode fs/inode.c:263 [inline] new_inode_pseudo+0x82/0x1d0 fs/inode.c:1049 alloc_anon_inode+0x1f/0x310 fs/libfs.c:1599 anon_inode_make_secure_inode+0x91/0x150 fs/anon_inodes.c:77 secretmem_file_create mm/secretmem.c:199 [inline] __do_sys_memfd_secret mm/secretmem.c:244 [inline] __se_sys_memfd_secret+0xce/0x320 mm/secretmem.c:224 Memory state around the buggy address: ffff888070336700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888070336780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888070336800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888070336880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888070336900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================