linux-kernel - prctl(0x8) -> EINVAL [Was: 2.6.25-rc3-mm1]

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Message-ID: <47CE7B1F.3000208@gmail.com>
Date:	Wed, 05 Mar 2008 11:51:11 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org,
	"Andrew G. Morgan" <morgan@...nel.org>,
	Serge Hallyn <serue@...ibm.com>,
	James Morris <jmorris@...ei.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Paul Moore <paul.moore@...com>
Subject: prctl(0x8) -> EINVAL [Was: 2.6.25-rc3-mm1]

On 03/04/2008 10:19 AM, Andrew Morton wrote:
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.25-rc3/2.6.25-rc3-mm1/
> +capabilities-implement-per-process-securebits.patch

This probably causes userspace damage:

dbus:
prctl(0x8, 0x1, 0, 0, 0)                = -1 EINVAL (Invalid argument)

named:
named: -u with Linux threads not supported: requires kernel support for 
prctl(PR_SET_KEEPCAPS)
prctl(0x8, 0x1, 0, 0, 0)          = -1 EINVAL (Invalid argument)

ntpd:
prctl(0x8, 0x1, 0xffffffffffffffa8, 0x1, 0) = -1 EINVAL (Invalid argument)
prctl(0x8, 0x1, 0, 0, 0)          = -1 EINVAL (Invalid argument)

$ grep CONFIG_SECURITY .config
# CONFIG_SECURITY is not set
# CONFIG_SECURITY_FILE_CAPABILITIES is not set
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