linux-kernel - Re: [syzbot] [kernfs?] possible deadlock in kernfs_fop

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Message-ID: <20240406001019.GV538574@ZenIV>
Date: Sat, 6 Apr 2024 01:10:19 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: syzbot <syzbot+9a5b0ced8b1bfb238b56@...kaller.appspotmail.com>
Cc: hdanton@...a.com, linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernfs?] possible deadlock in kernfs_fop_llseek

On Fri, Apr 05, 2024 at 04:02:03PM -0700, syzbot wrote:
> Hello,
> 
> syzbot tried to test the proposed patch but the build/boot failed:
> 
> failed to apply patch:
> checking file fs/overlayfs/util.c
> Hunk #1 FAILED at 639.
> 1 out of 1 hunk FAILED

Heh...

ed fs/kernfs/file.c <<'EOF'
/mutex_init/a
	else if (file->f_mode & FMODE_WRITE)
		mutex_init(&of->mutex);
.
w
q
EOF

(and if the bot is willing to apply that kind of patches, we have a security
problem on hands ;-)