linux-kernel - Re: [PATCH 1/1] coredump: use task comm instead of (unknown)

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Message-Id: <20110506123328.d0a707b7.akpm@linux-foundation.org>
Date:	Fri, 6 May 2011 12:33:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH 1/1] coredump: use task comm instead of (unknown)

(Cc John)

On Fri, 6 May 2011 21:26:39 +0900
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> wrote:

> Andrew Morton wrote:
> > Direct access to current->comm is racy since we added
> > prctl(PR_SET_NAME).
> 
> A passer-by's question. Did we change below one
> 
> char *get_task_comm(char *buf, struct task_struct *tsk)
> {
> 	/* buf must be at least sizeof(tsk->comm) in size */
> 	task_lock(tsk);
> 	strncpy(buf, tsk->comm, sizeof(tsk->comm));
> 	task_unlock(tsk);
> 	return buf;
> }
> 
> since some archs may do like
> 
> char *strncpy(char *dest, const char *src, size_t n)
> {
> 	size_t len = __strnend(src, n) - src;
> 	__builtin_memset(dest + len, 0, n - len);
> 	__builtin_memcpy(dest, src, len);
> 	return dest;
> }
> 
> ( arch/s390/lib/string.c ) after adding prctl(PR_SET_NAME)?

I don't understand what you're asking, sorry.
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