From: Yafang Shao <laoar.shao@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Kees Cook <keescook@chromium.org>,
Peter Zijlstra <peterz@infradead.org>,
Petr Mladek <pmladek@suse.com>, Al Viro <viro@zeniv.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Valentin Schneider <valentin.schneider@arm.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
qiang.zhang@windriver.com, robdclark@chromium.org,
christian@brauner.io, Dietmar Eggemann <dietmar.eggemann@arm.com>,
Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Benjamin Segall <bsegall@google.com>,
Mel Gorman <mgorman@suse.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
David Miller <davem@davemloft.net>,
kuba@kernel.org, LKML <linux-kernel@vger.kernel.org>,
Vladimir Zapolskiy <vzapolskiy@gmail.com>,
David Howells <dhowells@redhat.com>
Subject: Re: [PATCH v4 2/5] connector: use __get_task_comm in proc_comm_connector
Date: Thu, 14 Oct 2021 10:42:42 +0800 [thread overview]
Message-ID: <CALOAHbDb7OicA1m8CTCX3RS9h5N=_xS-Jiq+88Nn4A1Vk6TWrw@mail.gmail.com> (raw)
In-Reply-To: <20211013222418.7ea9727d@oasis.local.home>
On Thu, Oct 14, 2021 at 10:24 AM Steven Rostedt <rostedt@goodmis.org> wrote:
>
> On Thu, 14 Oct 2021 09:48:09 +0800
> Yafang Shao <laoar.shao@gmail.com> wrote:
>
> > > __get_task_comm() uses strncpy() which my understanding is, does not add
> > > the nul terminating byte when truncating. Which changes the functionality
> > > here. As all task comms have a terminating byte, the old method would copy
> > > that and include it. This won't add the terminating byte if the buffer is
> > > smaller than the comm, and that might cause issues.
> > >
> >
> > Right, that is a problem.
> > It seems that we should add a new helper get_task_comm_may_truncated().
>
> Or simply change __get_task_comm() to:
>
> char *__get_task_comm(char *buf, size_t buf_size, struct task_struct *tsk)
> {
> task_lock(tsk);
> strncpy(buf, tsk->comm, buf_size);
> /* The copied value is always nul terminated */
> buf[buf_size - 1] = '\0';
> task_unlock(tsk);
> return buf;
> }
>
That is better! Thanks for the suggestion.
> But that should probably be a separate patch.
>
Sure.
--
Thanks
Yafang
next prev parent reply other threads:[~2021-10-14 2:43 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-13 10:23 [PATCH v4 0/5] task_struct: extend task comm from 16 to 24 for CONFIG_BASE_FULL Yafang Shao
2021-10-13 10:23 ` [PATCH v4 1/5] elfcore: use TASK_COMM_LEN instead of 16 in prpsinfo Yafang Shao
2021-10-13 13:11 ` Steven Rostedt
2021-10-14 1:46 ` Yafang Shao
2021-10-13 10:23 ` [PATCH v4 2/5] connector: use __get_task_comm in proc_comm_connector Yafang Shao
2021-10-13 14:19 ` Steven Rostedt
2021-10-14 1:48 ` Yafang Shao
2021-10-14 2:24 ` Steven Rostedt
2021-10-14 2:42 ` Yafang Shao [this message]
2021-10-14 4:50 ` Kees Cook
2021-10-14 9:26 ` Yafang Shao
2021-10-14 13:31 ` Steven Rostedt
2021-10-13 10:23 ` [PATCH v4 3/5] fs/exec: use strscpy instead of strlcpy in __set_task_comm Yafang Shao
2021-10-13 10:23 ` [PATCH v4 4/5] sched.h: extend task comm from 16 to 24 for CONFIG_BASE_FULL Yafang Shao
2021-10-13 10:23 ` [PATCH v4 5/5] kernel/kthread: show a warning if kthread's comm is truncated Yafang Shao
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