linux-kernel - [PATCH] KEYS: Enable the compat keyctl wrapper on s390x

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Message-ID: <20120214145022.12531.16731.stgit@warthog.procyon.org.uk>
Date:	Tue, 14 Feb 2012 14:50:22 +0000
From:	David Howells <dhowells@...hat.com>
To:	keyrings@...ux-nfs.org
Cc:	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>,
	dan@...ny.cz, Carsten Otte <cotte@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux-s390@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH] KEYS: Enable the compat keyctl wrapper on s390x

Enable the compat keyctl wrapper on s390x so that 32-bit s390 userspace can
call the keyctl() syscall.

There's an s390x assembly wrapper that truncates all the register values to
32-bits and this then calls compat_sys_keyctl() - but the latter only exists if
CONFIG_KEYS_COMPAT is enabled, and the s390 Kconfig doesn't enable it.

Without this patch, 32-bit calls to the keyctl() syscall are given an ENOSYS
error:

	[root@...el4 ~]# keyctl show
	Session Keyring
	-3: key inaccessible (Function not implemented)

Signed-off-by: David Howells <dhowells@...hat.com>
Acked-by: dan@...ny.cz
cc: Carsten Otte <cotte@...ibm.com>
cc: Christian Borntraeger <borntraeger@...ibm.com>
cc: linux-s390@...r.kernel.org
cc: stable@...r.kernel.org
---

 arch/s390/Kconfig |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index d172758..6d99a5f 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -227,6 +227,9 @@ config COMPAT
 config SYSVIPC_COMPAT
 	def_bool y if COMPAT && SYSVIPC
 
+config KEYS_COMPAT
+	def_bool y if COMPAT && KEYS
+
 config AUDIT_ARCH
 	def_bool y
 

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