[syzbot] [jfs?] KASAN: slab-out-of-bounds Write in diWrite

syzbot
2024-04-25T21:10:21Z

Hello,

syzbot found the following issue on:

HEAD commit: 7b4f2bc91c15 Add linux-next specific files for 20240418
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1181b910980000
kernel config: https://syzkaller.appspot.com/x/.config?x=ae644165a243bf62
dashboard link: https://syzkaller.appspot.com/bug?extid=aa6df9d3b383bf5f047f
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=108f21c7180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=128532bb180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/524a18e6c5be/disk-7b4f2bc9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/029f1b84d653/vmlinux-7b4f2bc9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c02d1542e886/bzImage-7b4f2bc9.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/b09f946202a4/mount_0.gz

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10dec06b180000
final oops: https://syzkaller.appspot.com/x/report.txt?x=12dec06b180000
console output: https://syzkaller.appspot.com/x/log.txt?x=14dec06b180000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+aa6df9d3b383bf5f047f@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: use-after-free in diWrite+0xde3/0x19b0 fs/jfs/jfs_imap.c:750
Write of size 32 at addr ffff888076cee0c0 by task syz-executor949/5083

CPU: 1 PID: 5083 Comm: syz-executor949 Not tainted 6.9.0-rc4-next-20240418-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
__asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
diWrite+0xde3/0x19b0 fs/jfs/jfs_imap.c:750
txCommit+0xa1a/0x6a20 fs/jfs/jfs_txnmgr.c:1255
add_missing_indices fs/jfs/jfs_dtree.c:2661 [inline]
jfs_readdir+0x28e9/0x4660 fs/jfs/jfs_dtree.c:3009
wrap_directory_iterator+0x94/0xe0 fs/readdir.c:67
iterate_dir+0x65e/0x820 fs/readdir.c:110
__do_sys_getdents64 fs/readdir.c:409 [inline]
__se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:394
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff57c567679
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffddcb47e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fffddcb49b8 RCX: 00007ff57c567679
RDX: 000000000000005d RSI: 00000000200002c0 RDI: 0000000000000005
RBP: 00007ff57c5e0610 R08: 0000000000000000 R09: 00007fffddcb49b8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffddcb49a8 R14: 0000000000000001 R15: 0000000000000001
</TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76cee
flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff)
raw: 00fff80000000000 ffffea0001db3bc8 ffffea0001dcea48 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x500cc2(GFP_HIGHUSER|__GFP_ACCOUNT), pid 5078, tgid 397447660 (sshd), ts 5078, free_ts 51945391130
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1476
prep_new_page mm/page_alloc.c:1484 [inline]
get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3446
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4704
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
pipe_write+0x657/0x1a40 fs/pipe.c:513
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa72/0xc90 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5080 tgid 5080 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1096 [inline]
free_unref_page+0xd22/0xea0 mm/page_alloc.c:2609
__folio_put+0x3b9/0x620 mm/swap.c:129
pipe_buf_release include/linux/pipe_fs_i.h:219 [inline]
pipe_update_tail fs/pipe.c:224 [inline]
pipe_read+0x6f2/0x13e0 fs/pipe.c:344
new_sync_read fs/read_write.c:395 [inline]
vfs_read+0x9c4/0xbd0 fs/read_write.c:476
ksys_read+0x1a0/0x2c0 fs/read_write.c:619
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
ffff888076cedf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888076cee000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888076cee080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff888076cee100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff888076cee180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

---
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