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From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Alexey Gladkov <gladkov.alexey@gmail.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	syzbot <syzbot+c1af344512918c61362c@syzkaller.appspotmail.com>,
	jmorris@namei.org, linux-next@vger.kernel.org,
	linux-security-module@vger.kernel.org, serge@hallyn.com,
	sfr@canb.auug.org.au, syzkaller-bugs@googlegroups.com,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH v3] proc: proc_pid_ns takes super_block as an argument
Date: Tue, 19 May 2020 00:36:34 +0900
Message-ID: <ffcf787e-8380-96e8-0432-54742140f490@i-love.sakura.ne.jp> (raw)
In-Reply-To: <20200518150818.2929164-1-gladkov.alexey@gmail.com>

I would shorten like below:

syzbot found that

  touch /proc/testfile

causes NULL pointer dereference at tomoyo_get_local_path()
because inode of the dentry is NULL.

Before c59f415a7cb6, Tomoyo received pid_ns from proc's s_fs_info
directly. Since proc_pid_ns() can only work with inode, using it in
the tomoyo_get_local_path() was wrong.

To avoid creating more functions for getting proc_ns, change the
argument type of the proc_pid_ns() function. Then, Tomoyo can use
the existing super_block to get pid_ns.


  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15 14:46 linux-next boot error: general protection fault in tomoyo_get_local_path syzbot
2020-05-15 15:18 ` Tetsuo Handa
2020-05-15 15:36   ` Tetsuo Handa
2020-05-15 20:13     ` Al Viro
2020-05-15 20:36       ` Eric W. Biederman
2020-05-15 20:56       ` Al Viro
2020-05-15 18:16   ` Eric W. Biederman
2020-05-15 19:25     ` Alexey Gladkov
2020-05-17 17:11     ` [PATCH] proc: proc_pid_ns takes super_block as an argument Alexey Gladkov
2020-05-18 11:17     ` [PATCH v2] " Alexey Gladkov
2020-05-18 12:08       ` Eric W. Biederman
2020-05-18 12:56         ` Alexey Gladkov
2020-05-18 12:57           ` Eric W. Biederman
2020-05-18 15:08     ` [PATCH v3] " Alexey Gladkov
2020-05-18 15:36       ` Tetsuo Handa [this message]
2020-05-18 18:07     ` [PATCH v4] " Alexey Gladkov

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