Received-SPF: pass (google.com: domain of linux-kernel+bounces-105391-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
Precedence: bulk
MIME-Version: 1.0
References: <00000000000043c5e70613882ad1@google.com>
In-Reply-To: <00000000000043c5e70613882ad1@google.com>
From: Amir Goldstein <amir73il@gmail.com>
Date: Sun, 17 Mar 2024 15:05:52 +0200
Message-ID: <CAOQ4uxjdGyN84GV7rA3FTWYzvSTTY6+bza2PvHn2mNpHTPfxFA@mail.gmail.com>
Subject: Re: [syzbot] [overlayfs?] WARNING in ovl_copy_up_file
To: syzbot <syzbot+3abd99031b42acf367ef@syzkaller.appspotmail.com>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, 
	linux-unionfs@vger.kernel.org, miklos@szeredi.hu, 
	syzkaller-bugs@googlegroups.com
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Wed, Mar 13, 2024 at 12:23=E2=80=AFPM syzbot
<syzbot+3abd99031b42acf367ef@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    707081b61156 Merge branch 'for-next/core', remote-trackin=
g..
> 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=3D1785a85918000=
0
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3Dcaeac3f3565b0=
57a
> dashboard link: https://syzkaller.appspot.com/bug?extid=3D3abd99031b42acf=
367ef
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Deb=
ian) 2.40
> userspace arch: arm64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=3D1115ada6180=
000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=3D1626870a18000=
0
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/6cad68bf7532/dis=
k-707081b6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/1a27e5400778/vmlinu=
x-707081b6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/67dfc53755d0/I=
mage-707081b6.gz.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the comm=
it:
> Reported-by: syzbot+3abd99031b42acf367ef@syzkaller.appspotmail.com
>

#syz test: https://github.com/amir73il/linux ovl-fixes

Thanks,
Amir.

> evm: overlay not supported
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 6187 at fs/overlayfs/copy_up.c:239 ovl_copy_up_file+=
0x624/0x674 fs/overlayfs/copy_up.c:330
> Modules linked in:
> CPU: 0 PID: 6187 Comm: syz-executor136 Not tainted 6.8.0-rc7-syzkaller-g7=
07081b61156 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS G=
oogle 01/25/2024
> pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=3D--)
> pc : ovl_copy_up_file+0x624/0x674 fs/overlayfs/copy_up.c:330
> lr : ovl_verify_area fs/overlayfs/copy_up.c:239 [inline]
> lr : ovl_copy_up_file+0x620/0x674 fs/overlayfs/copy_up.c:330
> sp : ffff800097997180
> x29: ffff800097997280 x28: 00000000fffffffb x27: ffff700012f32e3c
> x26: 0000000000800000 x25: 0000000000800000 x24: ffff800097997240
> x23: ffff800097997220 x22: ffffffffffa64000 x21: ffffffffffa64000
> x20: ffff0000d9fc1900 x19: dfff800000000000 x18: 1ffff00012f32dee
> x17: ffff80008ec9d000 x16: ffff80008ad6b1c0 x15: 0000000000000001
> x14: 1fffe0001b9177f2 x13: 0000000000000000 x12: 0000000000000000
> x11: 0000000000000001 x10: 0000000000ff0100 x9 : 0000000000000000
> x8 : ffff0000d7568000 x7 : ffff80008108d924 x6 : 0000000000000000
> x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008031a200
> x2 : 00000ffffffff000 x1 : ffffffffffa64000 x0 : ffffffffffffffff
> Call trace:
>  ovl_copy_up_file+0x624/0x674 fs/overlayfs/copy_up.c:330
>  ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:863 [inline]
>  ovl_do_copy_up fs/overlayfs/copy_up.c:976 [inline]
>  ovl_copy_up_one fs/overlayfs/copy_up.c:1168 [inline]
>  ovl_copy_up_flags+0x16d0/0x3694 fs/overlayfs/copy_up.c:1223
>  ovl_copy_up+0x24/0x34 fs/overlayfs/copy_up.c:1263
>  ovl_setattr+0xfc/0x4e4 fs/overlayfs/inode.c:41
>  notify_change+0x9d4/0xc8c fs/attr.c:499
>  chmod_common+0x23c/0x418 fs/open.c:648
>  do_fchmodat fs/open.c:696 [inline]
>  __do_sys_fchmodat fs/open.c:715 [inline]
>  __se_sys_fchmodat fs/open.c:712 [inline]
>  __arm64_sys_fchmodat+0x118/0x1dc fs/open.c:712
>  __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
>  invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
>  el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
>  do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
>  el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
>  el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
>  el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
> irq event stamp: 862
> hardirqs last  enabled at (861): [<ffff8000831abcb4>] percpu_counter_add_=
batch+0x210/0x30c lib/percpu_counter.c:102
> hardirqs last disabled at (862): [<ffff80008ad66988>] el1_dbg+0x24/0x80 a=
rch/arm64/kernel/entry-common.c:470
> softirqs last  enabled at (62): [<ffff80008002189c>] softirq_handle_end k=
ernel/softirq.c:399 [inline]
> softirqs last  enabled at (62): [<ffff80008002189c>] __do_softirq+0xac8/0=
xce4 kernel/softirq.c:582
> softirqs last disabled at (53): [<ffff80008002ab48>] ____do_softirq+0x14/=
0x20 arch/arm64/kernel/irq.c:81
> ---[ end trace 0000000000000000 ]---
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup