================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x9c1/0x1e20 fs/ext4/xattr.c:1761 Read of size 18446744073709551600 at addr ffff88801fdfbeb8 by task syz.0.0/5325 CPU: 0 UID: 0 PID: 5325 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 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+0x9c1/0x1e20 fs/ext4/xattr.c:1761 ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2273 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+0x357/0x18c0 fs/ext4/inode.c:1310 ext4_da_write_begin+0x355/0xd80 fs/ext4/inode.c:3133 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4319 ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:300 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4b1df9c819 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:00007f4b1eddffe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f4b1e216090 RCX: 00007f4b1df9c819 RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000008 RBP: 00007f4b1e032c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4b1e216128 R14: 00007f4b1e216090 R15: 00007ffdf9cbc2d8 The buggy address belongs to the physical page: page: refcount:3 mapcount:0 mapping:ffff88801cc2e6c8 index:0x2 pfn:0x1fdfb memcg:ffff88801cac8d40 aops:def_blk_aops ino:700000 dentry name(?):"" flags: 0xfff18000004214(referenced|dirty|workingset|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff18000004214 0000000000000000 dead000000000122 ffff88801cc2e6c8 raw: 0000000000000002 ffff888047b2aae0 00000003ffffffff ffff88801cac8d40 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 5325, tgid 5323 (syz.0.0), ts 85375254493, free_ts 85373897345 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_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0xa8/0x1a0 mm/mempolicy.c:2581 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2591 filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1013 __filemap_get_folio_mpol+0x3fc/0xb00 mm/filemap.c:2011 __filemap_get_folio include/linux/pagemap.h:763 [inline] grow_dev_folio fs/buffer.c:1047 [inline] grow_buffers fs/buffer.c:1113 [inline] __getblk_slow fs/buffer.c:1131 [inline] bdev_getblk+0x1f6/0x6e0 fs/buffer.c:1458 __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:4802 ext4_get_inode_loc+0x81/0xf0 fs/ext4/inode.c:4930 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:423 cap_inode_need_killpriv+0x45/0x60 security/commoncap.c:331 security_inode_need_killpriv+0x85/0x240 security/security.c:2161 page last free pid 5294 tgid 5294 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] free_unref_folios+0xed5/0x16d0 mm/page_alloc.c:3040 folios_put_refs+0x789/0x8d0 mm/swap.c:1002 free_pages_and_swap_cache+0x537/0x5b0 mm/swap_state.c:426 __tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline] tlb_batch_pages_flush mm/mmu_gather.c:151 [inline] tlb_flush_mmu_free mm/mmu_gather.c:398 [inline] tlb_flush_mmu+0x6d3/0xa30 mm/mmu_gather.c:405 tlb_finish_mmu+0xf9/0x230 mm/mmu_gather.c:530 unmap_region+0x2a5/0x330 mm/vma.c:488 vms_clear_ptes mm/vma.c:1284 [inline] vms_complete_munmap_vmas+0x493/0xc60 mm/vma.c:1326 do_vmi_align_munmap+0x3b7/0x4b0 mm/vma.c:1585 do_vmi_munmap+0x252/0x2d0 mm/vma.c:1633 __vm_munmap+0x22c/0x3d0 mm/vma.c:3254 __do_sys_munmap mm/mmap.c:1078 [inline] __se_sys_munmap mm/mmap.c:1075 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:1075 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 Memory state around the buggy address: ffff88801fdfbd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801fdfbe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88801fdfbe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88801fdfbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801fdfbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================