syzbot


KASAN: use-after-free Read in udf_new_inode

Status: upstream: reported on 2024/04/11 23:52
Reported-by: syzbot+ccb8a56582e50fdd1c7a@syzkaller.appspotmail.com
First crash: 68d, last: 68d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: use-after-free Read in udf_new_inode udf 2 552d 568d 0/27 auto-obsoleted due to no activity on 2023/04/13 23:11

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in udf_new_inode+0xde2/0xf10
Read of size 4 at addr ffff88815761bdc8 by task syz-executor.2/11153

CPU: 1 PID: 11153 Comm: syz-executor.2 Not tainted 6.1.85-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+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 udf_new_inode+0xde2/0xf10
 udf_create+0x1f/0x140 fs/udf/namei.c:612
 lookup_open fs/namei.c:3484 [inline]
 open_last_lookups fs/namei.c:3552 [inline]
 path_openat+0x12f1/0x2e60 fs/namei.c:3782
 do_filp_open+0x230/0x480 fs/namei.c:3812
 do_sys_openat2+0x13b/0x500 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_openat fs/open.c:1350 [inline]
 __se_sys_openat fs/open.c:1345 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1345
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f090167de69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f09023e90c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f09017ac050 RCX: 00007f090167de69
RDX: 000000000000275a RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 00007f09016ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f09017ac050 R15: 00007ffda14655b8
 </TASK>

The buggy address belongs to the physical page:
page:ffffea00055d86c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15761b
flags: 0x57ff80000000000(node=1|zone=2|lastcpupid=0xfff)
raw: 057ff80000000000 ffffea00055d86c8 ffffea00055d86c8 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff88815761bc80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88815761bd00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88815761bd80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff88815761be00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88815761be80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/11 23:51 linux-6.1.y bf1e3b1cb1e0 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in udf_new_inode
2024/04/11 23:51 linux-6.1.y bf1e3b1cb1e0 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in udf_new_inode
* Struck through repros no longer work on HEAD.