syzbot


KASAN: use-after-free Read in ext4_xattr_delete_inode

Status: upstream: reported C repro on 2024/05/31 08:44
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+93b5dbd72bdcbd60b5ec@syzkaller.appspotmail.com
First crash: 45d, last: 17d
Bug presence (2)
Date Name Commit Repro Result
2024/05/31 lts (merge base) 8b4118fabd6e C [report] KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/05/31 upstream (ToT) 4a4be1ad3a6e C [report] KASAN: use-after-free Read in ext4_xattr_delete_inode
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: use-after-free Read in ext4_xattr_delete_inode 50 17d 42d 0/3 upstream: reported on 2024/06/03 15:23
android-54 KASAN: use-after-free Read in ext4_xattr_delete_inode C 212 13d 50d 0/2 upstream: reported C repro on 2024/05/26 05:00
android-5-15 KASAN: use-after-free Read in ext4_xattr_delete_inode origin:upstream C 194 10d 45d 0/2 upstream: reported C repro on 2024/05/31 07:59
android-5-10 KASAN: use-after-free Read in ext4_xattr_delete_inode C 47 6d00h 45d 0/2 upstream: reported C repro on 2024/05/31 07:37
linux-5.15 KASAN: use-after-free Read in ext4_xattr_delete_inode origin:upstream C 48 33d 45d 0/3 upstream: reported C repro on 2024/05/31 07:20
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/06/28 01:25 11m retest repro android14-6.1 report log

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2905
Read of size 4 at addr ffff8881228df000 by task syz-executor117/295

CPU: 1 PID: 295 Comm: syz-executor117 Not tainted 6.1.75-syzkaller-00033-gdd875b63669a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x158/0x4e0 mm/kasan/report.c:427
 kasan_report+0x13c/0x170 mm/kasan/report.c:531
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350
 ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2905
 ext4_evict_inode+0xef9/0x1550 fs/ext4/inode.c:296
 evict+0x2a3/0x630 fs/inode.c:666
 iput_final fs/inode.c:1791 [inline]
 iput+0x642/0x870 fs/inode.c:1817
 d_delete_notify include/linux/fsnotify.h:284 [inline]
 vfs_rmdir+0x3c2/0x500 fs/namei.c:4211
 do_rmdir+0x3ab/0x630 fs/namei.c:4259
 __do_sys_rmdir fs/namei.c:4278 [inline]
 __se_sys_rmdir fs/namei.c:4276 [inline]
 __x64_sys_rmdir+0x49/0x50 fs/namei.c:4276
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fcd595e3dc7
Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 54 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffff8146ce8 EFLAGS: 00000207 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcd595e3dc7
RDX: 0000000000008890 RSI: 0000000000000000 RDI: 00007ffff8147e90
RBP: 0000000000000065 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffff8147e90
R13: 00005555573bd740 R14: 431bde82d7b634db R15: 00007ffff814a010
 </TASK>

The buggy address belongs to the physical page:
page:ffffea00048a37c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1228df
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea00048a3808 ffff8881f713bb68 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 297, tgid 297 (udevd), ts 22637829813, free_ts 22638261179
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597
 get_page_from_freelist+0x27ea/0x2870 mm/page_alloc.c:4425
 __alloc_pages+0x3a1/0x780 mm/page_alloc.c:5712
 __folio_alloc+0x15/0x40 mm/page_alloc.c:5744
 __folio_alloc_node include/linux/gfp.h:245 [inline]
 folio_alloc include/linux/gfp.h:274 [inline]
 shmem_alloc_folio mm/shmem.c:1597 [inline]
 shmem_alloc_and_acct_folio+0x78c/0xa50 mm/shmem.c:1622
 shmem_get_folio_gfp+0x12d4/0x24b0 mm/shmem.c:1950
 shmem_get_folio mm/shmem.c:2081 [inline]
 shmem_write_begin+0x164/0x3a0 mm/shmem.c:2569
 generic_perform_write+0x2f9/0x5c0 mm/filemap.c:3838
 __generic_file_write_iter+0x174/0x3a0 mm/filemap.c:3966
 generic_file_write_iter+0xb1/0x310 mm/filemap.c:3998
 call_write_iter include/linux/fs.h:2258 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x902/0xeb0 fs/read_write.c:584
 ksys_write+0x199/0x2c0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1498 [inline]
 free_pcp_prepare mm/page_alloc.c:1572 [inline]
 free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3498
 free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3646
 release_pages+0xf7f/0xfe0 mm/swap.c:1063
 __pagevec_release+0x84/0x100 mm/swap.c:1083
 pagevec_release include/linux/pagevec.h:71 [inline]
 folio_batch_release include/linux/pagevec.h:135 [inline]
 shmem_undo_range+0x5fc/0x1660 mm/shmem.c:951
 shmem_truncate_range mm/shmem.c:1067 [inline]
 shmem_evict_inode+0x25f/0xa30 mm/shmem.c:1176
 evict+0x2a3/0x630 fs/inode.c:666
 iput_final fs/inode.c:1791 [inline]
 iput+0x642/0x870 fs/inode.c:1817
 dentry_unlink_inode+0x34f/0x440 fs/dcache.c:401
 __dentry_kill+0x447/0x650 fs/dcache.c:607
 dentry_kill+0xc0/0x2a0
 dput+0x160/0x310 fs/dcache.c:913
 do_renameat2+0xbc9/0x1400 fs/namei.c:5016
 __do_sys_rename fs/namei.c:5060 [inline]
 __se_sys_rename fs/namei.c:5058 [inline]
 __x64_sys_rename+0x86/0x90 fs/namei.c:5058
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff8881228def00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881228def80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881228df000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8881228df080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881228df100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs error (device loop0): ext4_xattr_inode_iget:404: comm syz-executor117: inode #1: comm syz-executor117: iget: illegal inode #
EXT4-fs error (device loop0): ext4_xattr_inode_iget:409: comm syz-executor117: error while reading EA inode 1 err=-117
EXT4-fs error (device loop0): ext4_xattr_inode_iget:404: comm syz-executor117: inode #1: comm syz-executor117: iget: illegal inode #
EXT4-fs error (device loop0): ext4_xattr_inode_iget:409: comm syz-executor117: error while reading EA inode 1 err=-117
EXT4-fs error (device loop0): ext4_xattr_inode_iget:404: comm syz-executor117: inode #1: comm syz-executor117: iget: illegal inode #
EXT4-fs error (device loop0): ext4_xattr_inode_iget:409: comm syz-executor117: error while reading EA inode 1 err=-117
EXT4-fs unmount: 248 callbacks suppressed
EXT4-fs (loop0): unmounting filesystem.
EXT4-fs (loop0): unmounting filesystem.

Crashes (92):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/31 08:41 android14-6.1 dd875b63669a 34889ee3 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/14 01:24 android14-6.1 7c734edeaafd a9616ff5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/13 14:36 android14-6.1 7c734edeaafd a9616ff5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/13 03:11 android14-6.1 b22d7c4ca0d3 2aa5052f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/13 00:33 android14-6.1 b22d7c4ca0d3 f815599d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/12 10:21 android14-6.1 dda68b1657b1 f815599d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/12 08:49 android14-6.1 dda68b1657b1 4d75f4f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/12 07:35 android14-6.1 65aed0e2f758 4d75f4f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/12 07:35 android14-6.1 65aed0e2f758 4d75f4f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/12 00:45 android14-6.1 65aed0e2f758 4d75f4f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/11 19:49 android14-6.1 65aed0e2f758 4d75f4f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/11 11:16 android14-6.1 ec795e4eaa8a b7d9eb04 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/11 05:54 android14-6.1 ac9706483e98 b7d9eb04 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/10 15:46 android14-6.1 ac9706483e98 048c640a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/08 21:53 android14-6.1 ac9706483e98 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/07 21:07 android14-6.1 ac9706483e98 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/07 19:07 android14-6.1 62a4d78ddaf1 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/07 06:24 android14-6.1 62a4d78ddaf1 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/06 17:39 android14-6.1 bfacfd198eca 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/06 07:41 android14-6.1 e4622d460ed8 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/06 02:11 android14-6.1 e4622d460ed8 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/05 14:58 android14-6.1 3c19f7015ee3 5aa1a7c9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/05 01:28 android14-6.1 9fcc2459efcd e1e2c66e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/04 13:57 android14-6.1 c5abb6172516 11f2afa5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/04 12:10 android14-6.1 c36abc6d4212 11f2afa5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/04 12:10 android14-6.1 c36abc6d4212 11f2afa5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/03 22:31 android14-6.1 c36abc6d4212 a1feae05 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/03 22:31 android14-6.1 c36abc6d4212 a1feae05 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/03 22:31 android14-6.1 c36abc6d4212 a1feae05 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/03 22:27 android14-6.1 c36abc6d4212 a1feae05 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/03 11:12 android14-6.1 997e6b3f6a21 0aba2352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/03 11:12 android14-6.1 997e6b3f6a21 0aba2352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/03 10:54 android14-6.1 997e6b3f6a21 0aba2352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/03 10:54 android14-6.1 997e6b3f6a21 0aba2352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/03 06:20 android14-6.1 74c507aab139 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/03 00:09 android14-6.1 74c507aab139 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/02 14:56 android14-6.1 74c507aab139 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/01 13:47 android14-6.1 74c507aab139 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/01 13:47 android14-6.1 74c507aab139 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/01 13:19 android14-6.1 74c507aab139 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/01 13:19 android14-6.1 74c507aab139 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/01 12:07 android14-6.1 74c507aab139 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/01 12:06 android14-6.1 74c507aab139 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/06/01 12:06 android14-6.1 74c507aab139 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
2024/05/31 07:18 android14-6.1 dd875b63669a 34889ee3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: use-after-free Read in ext4_xattr_delete_inode
* Struck through repros no longer work on HEAD.