loop0: detected capacity change from 2048 to 64 ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x9c1/0x1e20 fs/ext4/xattr.c:1763 Read of size 18446744073709551600 at addr ffff88805090feb8 by task syz.0.0/5328 CPU: 0 UID: 0 PID: 5328 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_destroy_inline_data+0x83/0xe0 fs/ext4/inline.c:1806 ext4_do_writepages+0x51e/0x4670 fs/ext4/inode.c:2827 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3042 do_writepages+0x32e/0x550 mm/page-writeback.c:2571 filemap_writeback mm/filemap.c:388 [inline] filemap_fdatawrite_range mm/filemap.c:413 [inline] file_write_and_wait_range+0x36e/0x440 mm/filemap.c:787 mmb_fsync_noflush+0x76/0x1c0 fs/buffer.c:645 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline] ext4_sync_file+0x437/0xd50 fs/ext4/fsync.c:160 generic_write_sync include/linux/fs.h:2654 [inline] ext4_buffered_write_iter+0x2ca/0x3a0 fs/ext4/file.c:322 ext4_file_write_iter+0x298/0x1bf0 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61d/0xb90 fs/read_write.c:688 ksys_pwrite64 fs/read_write.c:795 [inline] __do_sys_pwrite64 fs/read_write.c:803 [inline] __se_sys_pwrite64 fs/read_write.c:800 [inline] __x64_sys_pwrite64+0x199/0x230 fs/read_write.c:800 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: 0033:0x7fbc1199ce59 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:00007fbc1281afe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007fbc11c15fa0 RCX: 00007fbc1199ce59 RDX: 0000000000000001 RSI: 0000200000000080 RDI: 000000000000000c RBP: 00007fbc11a32d6f R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000feca R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbc11c16038 R14: 00007fbc11c15fa0 R15: 00007ffe726911f8 The buggy address belongs to the physical page: page: refcount:2 mapcount:0 mapping:ffff88801cc25940 index:0x2 pfn:0x5090f memcg:ffff888033941980 aops:def_blk_aops ino:700000 dentry name(?):"" flags: 0x4fff58000004234(referenced|dirty|lru|workingset|private|node=1|zone=1|lastcpupid=0x7ff) raw: 04fff58000004234 ffff888030448a80 ffff888030448a80 ffff88801cc25940 raw: 0000000000000002 ffff888046e2b2b8 00000002ffffffff ffff888033941980 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 5329, tgid 5327 (syz.0.0), ts 85831907507, free_ts 85815535870 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 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 5328 tgid 5327 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] mapping_try_invalidate+0x3c2/0x4c0 mm/truncate.c:579 loop_set_status+0x29b/0xe40 drivers/block/loop.c:1246 loop_set_status64 drivers/block/loop.c:1372 [inline] lo_ioctl+0xc21/0x1fb0 drivers/block/loop.c:1558 blkdev_ioctl+0x5e3/0x740 block/ioctl.c:797 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 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: ffff88805090fd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805090fe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805090fe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88805090ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805090ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================