From: Chris Down <chris@chrisdown.name>
To: Petr Mladek <pmladek@suse.com>
Cc: linux-kernel@vger.kernel.org,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
John Ogness <john.ogness@linutronix.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Kees Cook <keescook@chromium.org>,
kernel-team@fb.com
Subject: Re: code style: Re: [PATCH v4] printk: Userspace format enumeration support
Date: Wed, 17 Feb 2021 16:32:21 +0000 [thread overview]
Message-ID: <YC1FFVCNQpaJwO/N@chrisdown.name> (raw)
In-Reply-To: <YC1DjeZmBWmJe35c@chrisdown.name>
Chris Down writes:
>open(f);
> debugfs_file_get(f);
> fops->open();
> inode->private = ps;
> debugfs_file_put(f);
>
>remove_printk_fmt_sec(); /* kfree ps */
>
>read(f);
> debugfs_file_get(f);
> fops->read();
> ps = inode->private; /* invalid */
> debugfs_file_put(f);
Er, sorry, inode->private is populated at creation time, not at open(). The
same general concern applies though -- as far as I can tell there's some period
where we may be able to _read() and `ps` has already been freed.
next prev parent reply other threads:[~2021-02-17 16:34 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-12 15:30 [PATCH v4] printk: Userspace format enumeration support Chris Down
2021-02-12 18:01 ` kernel test robot
2021-02-13 14:29 ` Chris Down
2021-02-13 15:15 ` Chris Down
2021-02-16 15:53 ` output: was: " Petr Mladek
2021-02-16 16:52 ` Chris Down
2021-02-17 14:27 ` Petr Mladek
2021-02-17 15:28 ` Chris Down
2021-02-17 19:17 ` Steven Rostedt
2021-02-17 21:23 ` Chris Down
2021-02-18 11:34 ` Petr Mladek
2021-02-16 16:00 ` debugfs: " Petr Mladek
2021-02-16 17:18 ` Chris Down
2021-02-17 15:35 ` Petr Mladek
2021-02-17 15:49 ` Chris Down
2021-02-16 17:14 ` code style: " Petr Mladek
2021-02-16 17:27 ` Chris Down
2021-02-16 21:00 ` Johannes Weiner
2021-02-16 21:05 ` Chris Down
2021-02-17 15:45 ` Petr Mladek
2021-02-17 15:56 ` Chris Down
2021-02-18 10:58 ` Petr Mladek
2021-02-17 16:00 ` Johannes Weiner
2021-02-17 16:09 ` Petr Mladek
2021-02-17 16:25 ` Chris Down
2021-02-17 16:32 ` Chris Down [this message]
2021-02-18 10:45 ` Petr Mladek
2021-02-18 12:21 ` Chris Down
2021-02-18 12:37 ` Petr Mladek
2021-02-18 12:41 ` Chris Down
2021-02-18 14:25 ` Petr Mladek
2021-02-18 15:53 ` Chris Down
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