================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x9c1/0x1e20 fs/ext4/xattr.c:1763 Read of size 18446744073709551600 at addr ffff888056287300 by task syz.0.0/5337 CPU: 0 UID: 0 PID: 5337 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 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+0x9c1/0x1e20 fs/ext4/xattr.c:1763 ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2275 ext4_destroy_inline_data_nolock+0x23a/0x5e0 fs/ext4/inline.c:472 ext4_convert_inline_data_to_extent+0x547/0xde0 fs/ext4/inline.c:631 ext4_write_begin+0x357/0x1890 fs/ext4/inode.c:1315 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4325 ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:316 ext4_file_write_iter+0x298/0x1bf0 fs/ext4/file.c:-1 iter_file_splice_write+0x9a1/0x10f0 fs/splice.c:736 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x101/0x160 fs/splice.c:1159 splice_direct_to_actor+0x53a/0xc70 fs/splice.c:1103 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x195/0x290 fs/splice.c:1228 do_sendfile+0x535/0x7d0 fs/read_write.c:1372 __do_sys_sendfile64 fs/read_write.c:1433 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f640b19ce59 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:00007f640bfe5fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f640b416180 RCX: 00007f640b19ce59 RDX: 0000000000000000 RSI: 000000000000000b RDI: 000000000000000a RBP: 00007f640b232d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f640b416218 R14: 00007f640b416180 R15: 00007ffd30994fd8 The buggy address belongs to the physical page: page: refcount:2 mapcount:0 mapping:ffff88801cc25940 index:0x2 pfn:0x56287 memcg:ffff888043b3f200 aops:def_blk_aops ino:700000 dentry name(?):"" flags: 0x4fff38000004234(referenced|dirty|lru|workingset|private|node=1|zone=1|lastcpupid=0x7ff) raw: 04fff38000004234 ffff8880304489e0 ffffea0001060008 ffff88801cc25940 raw: 0000000000000002 ffff888047042910 00000002ffffffff ffff888043b3f200 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_MOVABLE|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL), pid 5337, tgid 5328 (syz.0.0), ts 86705164446, free_ts 86565050950 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1858 prep_new_page mm/page_alloc.c:1866 [inline] get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226 alloc_pages_mpol+0x235/0x490 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0xac/0x2a0 mm/mempolicy.c:2581 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2591 filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1014 __filemap_get_folio_mpol+0x3fc/0xb00 mm/filemap.c:2012 __filemap_get_folio include/linux/pagemap.h:763 [inline] grow_dev_folio fs/buffer.c:954 [inline] grow_buffers fs/buffer.c:1020 [inline] __getblk_slow fs/buffer.c:1038 [inline] bdev_getblk+0x1f6/0x6e0 fs/buffer.c:1358 __getblk include/linux/buffer_head.h:380 [inline] sb_getblk include/linux/buffer_head.h:386 [inline] __ext4_get_inode_loc+0x528/0xfa0 fs/ext4/inode.c:4890 ext4_get_inode_loc+0x81/0xf0 fs/ext4/inode.c:5018 ext4_xattr_ibody_get+0x113/0x4c0 fs/ext4/xattr.c:648 ext4_xattr_get+0x123/0x6a0 fs/ext4/xattr.c:709 __vfs_getxattr+0x3f4/0x430 fs/xattr.c:441 cap_inode_need_killpriv+0x45/0x60 security/commoncap.c:331 security_inode_need_killpriv+0x85/0x240 security/security.c:2186 page last free pid 5330 tgid 5328 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1402 [inline] free_unref_folios+0xcec/0x1480 mm/page_alloc.c:3004 folios_put_refs+0x9ff/0xb40 mm/swap.c:1008 folio_batch_release include/linux/folio_batch.h:101 [inline] shmem_undo_range+0x52c/0x1660 mm/shmem.c:1149 shmem_truncate_range mm/shmem.c:1277 [inline] shmem_evict_inode+0x289/0xae0 mm/shmem.c:1407 evict+0x61e/0xb10 fs/inode.c:841 __dentry_kill+0x1a2/0x690 fs/dcache.c:718 finish_dput+0xc9/0x480 fs/dcache.c:927 __fput+0x691/0xa60 fs/file_table.c:518 fput_close_sync+0x11f/0x240 fs/file_table.c:615 __do_sys_close fs/open.c:1507 [inline] __se_sys_close fs/open.c:1492 [inline] __x64_sys_close+0x7e/0x110 fs/open.c:1492 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888056287200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888056287280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888056287300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888056287380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888056287400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================