Hello,
syzbot found the following issue on:
HEAD commit: dd875b63669a ANDROID: GKI: Update rockchip symbols for som..
git tree: android14-6.1
console+strace:
https://syzkaller.appspot.com/x/log.txt?x=12dc2f8a980000
kernel config:
https://syzkaller.appspot.com/x/.config?x=4a340f281ebc7608
dashboard link:
https://syzkaller.appspot.com/bug?extid=93b5dbd72bdcbd60b5ec
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:
https://syzkaller.appspot.com/x/repro.syz?x=12b5744a980000
C reproducer:
https://syzkaller.appspot.com/x/repro.c?x=174e4162980000
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/7af88db2f98b/disk-dd875b63.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/7e301d96f827/vmlinux-dd875b63.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/8421aa66a5f7/bzImage-dd875b63.xz
mounted in repro:
https://storage.googleapis.com/syzbot-assets/2f445bbb7f34/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+93b5db...@syzkaller.appspotmail.com
==================================================================
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.