linux-kernel - Re: [PATCH v2] devpts: allow mounting with uid/gid of uint32

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Message-ID: <87io8b3cd8.fsf@rasmusvillemoes.dk>
Date:	Wed, 19 Aug 2015 10:34:43 +0200
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Dongsu Park <dpark@...teo.net>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>,
	Josh Triplett <josh@...htriplett.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	Alban Crequy <alban@...ocode.com>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH v2] devpts: allow mounting with uid/gid of uint32_t

On Wed, Aug 19 2015, Andrew Morton <akpm@...ux-foundation.org> wrote:

>
> whoa, wait, I was looking at the -mm tree which changes kstrtouint():
>
> static inline int __must_check kstrtouint(const char *s, unsigned int base, unsigned int *res)
> {
> 	return parse_integer(s, base | PARSE_INTEGER_NEWLINE, res);
> }
>
> and
>
>  * Return number of characters parsed or -E.
>  ...
>  */
> #define parse_integer(s, base, val)	\
>
>
> Alexey, doesn't this mean that code which does
>
> 	if (kstrtouint(...))
> 		return -EFOO;
>
> will break?

No, because PARSE_INTEGER_NEWLINE means more than just accepting a
trailing newline. It also requires the entire string to be consumed, and
changes the return semantics.

I suggested splitting those three things into separate flags and letting
PARSE_INTEGER_KSTRTOX be a shorthand for those.

<http://thread.gmane.org/gmane.linux.kernel/1949066/focus=1949239>

Rasmus
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