Hello,
syzbot found the following issue on:
HEAD commit: c4215ee4771b Linux 4.14.302
git tree: linux-4.14.y
console output:
https://syzkaller.appspot.com/x/log.txt?x=11233db8480000
kernel config:
https://syzkaller.appspot.com/x/.config?x=4a9988fe055c9527
dashboard link:
https://syzkaller.appspot.com/bug?extid=6b0c1e6cf3c7a9345fb1
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)
syz repro:
https://syzkaller.appspot.com/x/repro.syz?x=158a3d44480000
C reproducer:
https://syzkaller.appspot.com/x/repro.c?x=13e50692480000
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/c93ba055d204/disk-c4215ee4.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/bfbc929a33c1/vmlinux-c4215ee4.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/444658051770/bzImage-c4215ee4.xz
mounted in repro:
https://storage.googleapis.com/syzbot-assets/79e81ec5eb61/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+6b0c1e...@syzkaller.appspotmail.com
ntfs: (device loop0): check_windows_hibernation_status(): Failed to find inode number for hiberfil.sys.
ntfs: (device loop0): load_system_files(): Failed to determine if Windows is hibernated. Will not be able to remount read-write. Run chkdsk.
ntfs: (device loop0): map_mft_record_page(): Attempt to read mft record 0x10000, which is beyond the end of the mft. This is probably a bug in the ntfs driver.
ntfs: (device loop0): map_mft_record(): Failed with error code 2.
==================================================================
BUG: KASAN: slab-out-of-bounds in ntfs_filldir fs/ntfs/dir.c:1034 [inline]
BUG: KASAN: slab-out-of-bounds in ntfs_readdir+0x2fd3/0x37f0 fs/ntfs/dir.c:1213
Read of size 1 at addr ffff8880b3f10971 by task syz-executor223/7964
CPU: 0 PID: 7964 Comm: syz-executor223 Not tainted 4.14.302-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 lib/dump_stack.c:58
print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
kasan_report mm/kasan/report.c:409 [inline]
__asan_report_load1_noabort+0x68/0x70 mm/kasan/report.c:427
ntfs_filldir fs/ntfs/dir.c:1034 [inline]
ntfs_readdir+0x2fd3/0x37f0 fs/ntfs/dir.c:1213
iterate_dir+0x478/0x5e0 fs/readdir.c:54
SYSC_getdents64 fs/readdir.c:358 [inline]
SyS_getdents64+0x125/0x230 fs/readdir.c:339
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fd4c153a789
RSP: 002b:00007ffca8591da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd4c153a789
RDX: 0000000000000098 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 00007fd4c14fa020 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000001e706 R11: 0000000000000246 R12: 00007fd4c14fa0b0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 7964:
save_stack mm/kasan/kasan.c:447 [inline]
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
__do_kmalloc mm/slab.c:3720 [inline]
__kmalloc+0x15a/0x400 mm/slab.c:3729
kmalloc include/linux/slab.h:493 [inline]
ntfs_readdir+0x37d/0x37f0 fs/ntfs/dir.c:1175
iterate_dir+0x478/0x5e0 fs/readdir.c:54
SYSC_getdents64 fs/readdir.c:358 [inline]
SyS_getdents64+0x125/0x230 fs/readdir.c:339
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
Freed by task 17:
save_stack mm/kasan/kasan.c:447 [inline]
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]
kfree+0xc9/0x250 mm/slab.c:3815
__d_free_external+0x3f/0x60 fs/dcache.c:289
__rcu_reclaim kernel/rcu/rcu.h:195 [inline]
rcu_do_batch kernel/rcu/tree.c:2699 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
rcu_process_callbacks+0x780/0x1180 kernel/rcu/tree.c:2946
__do_softirq+0x24d/0x9ff kernel/softirq.c:288
The buggy address belongs to the object at ffff8880b3f10900
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 49 bytes to the right of
64-byte region [ffff8880b3f10900, ffff8880b3f10940)
The buggy address belongs to the page:
page:ffffea0002cfc400 count:1 mapcount:0 mapping:ffff8880b3f10000 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff8880b3f10000 0000000000000000 0000000100000020
raw: ffffea0002a77620 ffffea0002598ea0 ffff88813fe74340 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880b3f10800: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff8880b3f10880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880b3f10900: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
^
ffff8880b3f10980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff8880b3f10a00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
---
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