linux-kernel - Re: [PATCH v2] vsprintf: Check real user/group id for %pK

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Date:	Tue, 08 Oct 2013 19:30:06 -0700
From:	Joe Perches <joe@...ches.com>
To:	Ryan Mallon <rmallon@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, eldad@...refinery.com,
	Jiri Kosina <jkosina@...e.cz>, jgunthorpe@...idianresearch.com,
	Dan Rosenberg <dan.j.rosenberg@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	George Spelvin <linux@...izon.com>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] vsprintf: Check real user/group id for %pK

On Wed, 2013-10-09 at 13:22 +1100, Ryan Mallon wrote:

> Anyway, updated patch below:

nit:

> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
[]
> @@ -1312,11 +1313,36 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
>  				spec.field_width = default_width;
>  			return string(buf, end, "pK-error", spec);
>  		}
> -		if (!((kptr_restrict == 0) ||
> -		      (kptr_restrict == 1 &&
> -		       has_capability_noaudit(current, CAP_SYSLOG))))
> +
> +		switch (kptr_restrict) {
> +		case 0:
> +			/* Always print %pK values */
> +			break;
> +		case 1: {
> +			/*
> +			 * Only print the real pointer value if the current
> +			 * proccess has CAP_SYSLOG and is running with the

s/proccess/process/ typo


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