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From: Al Viro <viro@zeniv.linux.org.uk>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: akpm@linux-foundation.org, pmladek@suse.com,
	peterz@infradead.org, valentin.schneider@arm.com,
	keescook@chromium.org, mathieu.desnoyers@efficios.com,
	qiang.zhang@windriver.com, robdclark@chromium.org,
	christian@brauner.io, dietmar.eggemann@arm.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/5] kernel: replace sizeof(task->comm) with TASK_COMM_LEN
Date: Sun, 3 Oct 2021 03:31:39 +0000	[thread overview]
Message-ID: <YVkkG+KOV6GQBAUf@zeniv-ca.linux.org.uk> (raw)
In-Reply-To: <20210929115036.4851-2-laoar.shao@gmail.com>

On Wed, Sep 29, 2021 at 11:50:32AM +0000, Yafang Shao wrote:

> --- a/kernel/sys.c
> +++ b/kernel/sys.c
> @@ -2265,7 +2265,7 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
>  		unsigned long, arg4, unsigned long, arg5)
>  {
>  	struct task_struct *me = current;
> -	unsigned char comm[sizeof(me->comm)];
> +	unsigned char comm[TASK_COMM_LEN];
>  	long error;
>  
>  	error = security_task_prctl(option, arg2, arg3, arg4, arg5);

Slightly below you have this:
        case PR_SET_NAME:
                comm[sizeof(me->comm) - 1] = 0;
                if (strncpy_from_user(comm, (char __user *)arg2,
                                      sizeof(me->comm) - 1) < 0)
                        return -EFAULT;
                set_task_comm(me, comm);
                proc_comm_connector(me);
                break;

How had that been tested?

  parent reply	other threads:[~2021-10-03  3:40 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-29 11:50 [PATCH 0/5] kthread: increase the size of kthread's comm Yafang Shao
2021-09-29 11:50 ` [PATCH 1/5] kernel: replace sizeof(task->comm) with TASK_COMM_LEN Yafang Shao
2021-09-29 18:09   ` Kees Cook
2021-09-30 12:27     ` Yafang Shao
2021-10-03  3:31   ` Al Viro [this message]
2021-10-03 14:14     ` Yafang Shao
2021-09-29 11:50 ` [PATCH 2/5] kernel/fork: allocate task->comm dynamicly Yafang Shao
2021-09-29 13:08   ` Yafang Shao
2021-09-29 18:11   ` Kees Cook
2021-09-30 12:41     ` Yafang Shao
2021-09-30 14:51       ` Petr Mladek
2021-10-01 11:58         ` Yafang Shao
2021-09-29 11:50 ` [PATCH 3/5] kernel/sched: improve the BUILD_BUG_ON() in get_task_comm() Yafang Shao
2021-09-29 18:12   ` Kees Cook
2021-09-30 12:43     ` Yafang Shao
2021-09-29 11:50 ` [PATCH 4/5] kernel: increase the size of kthread's comm Yafang Shao
2021-09-29 18:19   ` Kees Cook
2021-09-30 12:53     ` Yafang Shao
2021-09-29 11:50 ` [PATCH 5/5] kernel/kthread: show a warning if kthread's comm is still trucated Yafang Shao
2021-09-29 18:20   ` Kees Cook
2021-09-30 12:54     ` Yafang Shao
2021-09-30 15:17   ` Petr Mladek
2021-10-01 11:59     ` Yafang Shao
2021-10-03  3:41 ` [PATCH 0/5] kthread: increase the size of kthread's comm Al Viro
2021-10-03 14:20   ` Yafang Shao

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