From: syzbot <syzbot+d8fc21bfa138a5ae916d@syzkaller.appspotmail.com>
To: jack@suse.com, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in crc_itu_t
Date: Fri, 21 Oct 2022 12:43:41 -0700 [thread overview]
Message-ID: <000000000000aee20105eb90a803@google.com> (raw)
In-Reply-To: <000000000000f8389205e9f9ec5f@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: bbed346d5a96 Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1160ec86880000
kernel config: https://syzkaller.appspot.com/x/.config?x=3a4a45d2d827c1e
dashboard link: https://syzkaller.appspot.com/bug?extid=d8fc21bfa138a5ae916d
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15b5373a880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11200026880000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e8e91bc79312/disk-bbed346d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c1cb3fb3b77e/vmlinux-bbed346d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/f8dde53eb773/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d8fc21bfa138a5ae916d@syzkaller.appspotmail.com
netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
loop0: detected capacity change from 0 to 2048
Unable to handle kernel NULL pointer dereference at virtual address 000000000000001a
Mem abort info:
ESR = 0x0000000096000006
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
Data abort info:
ISV = 0, ISS = 0x00000006
CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=0000000107067000
[000000000000001a] pgd=080000010904b003, p4d=080000010904b003, pud=0800000109e4e003, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 3031 Comm: syz-executor632 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : crc_itu_t+0x40/0x88 lib/crc-itu-t.c:60
lr : crc_itu_t+0x30/0x88 lib/crc-itu-t.c:59
sp : ffff800012a03a20
x29: ffff800012a03a20 x28: 0000000000000026 x27: 000000000000002c
x26: 00000000fffffff0 x25: 0000000000000000 x24: 00000000b147c223
x23: ffff0000c752c690 x22: ffff80000c170b50 x21: 000000000000ffd9
x20: 000000000000001a x19: 00000000b147c223 x18: 00000000000000c0
x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff0000c5d8cf80
x14: 0000000000000010 x13: 0000000000000000 x12: ffff0000c5d8cf80
x11: ff808000095d5cec x10: 0000000000000000 x9 : ffff0000c5d8cf80
x8 : ffff8000095d5cec x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000004 x3 : 0000000000000010
x2 : 000000000000ffda x1 : 000000000000ffda x0 : 0000000000000000
Call trace:
crc_itu_t+0x40/0x88
udf_write_fi+0x308/0x4e0
udf_delete_entry fs/udf/namei.c:577 [inline]
udf_rename+0x47c/0x6d0 fs/udf/namei.c:1173
vfs_rename+0x59c/0x7f8 fs/namei.c:4756
do_renameat2+0x490/0x758 fs/namei.c:4907
__do_sys_renameat2 fs/namei.c:4940 [inline]
__se_sys_renameat2 fs/namei.c:4937 [inline]
__arm64_sys_renameat2+0x6c/0x88 fs/namei.c:4937
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: b40001f5 f0015cd6 d10006b5 912d42d6 (38401688)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: b40001f5 cbz x21, 0x3c
4: f0015cd6 adrp x22, 0x2b9b000
8: d10006b5 sub x21, x21, #0x1
c: 912d42d6 add x22, x22, #0xb50
* 10: 38401688 ldrb w8, [x20], #1 <-- trapping instruction
next prev parent reply other threads:[~2022-10-21 19:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-01 14:28 [syzbot] KASAN: use-after-free Read in crc_itu_t syzbot
2022-10-21 19:43 ` syzbot [this message]
2024-01-26 13:12 ` [syzbot] [udf?] " syzbot
2024-01-26 14:11 ` Jan Kara
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=000000000000aee20105eb90a803@google.com \
--to=syzbot+d8fc21bfa138a5ae916d@syzkaller.appspotmail.com \
--cc=jack@suse.com \
--cc=linux-kernel@vger.kernel.org \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.