[PATCH 4.4 23/28] security/keys: add CONFIG_KEYS_COMPAT to Kconfig

From: Greg Kroah-Hartman
Date: Thu Nov 16 2017 - 12:45:32 EST


4.4-stable review patch. If anyone has any objections, please let me know.

------------------

From: Bilal Amarni <bilal.amarni@xxxxxxxxx>

commit 47b2c3fff4932e6fc17ce13d51a43c6969714e20 upstream.

CONFIG_KEYS_COMPAT is defined in arch-specific Kconfigs and is missing for
several 64-bit architectures : mips, parisc, tile.

At the moment and for those architectures, calling in 32-bit userspace the
keyctl syscall would return an ENOSYS error.

This patch moves the CONFIG_KEYS_COMPAT option to security/keys/Kconfig, to
make sure the compatibility wrapper is registered by default for any 64-bit
architecture as long as it is configured with CONFIG_COMPAT.

[DH: Modified to remove arm64 compat enablement also as requested by Eric
Biggers]

Signed-off-by: Bilal Amarni <bilal.amarni@xxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>
cc: Eric Biggers <ebiggers3@xxxxxxxxx>
Signed-off-by: James Morris <james.l.morris@xxxxxxxxxx>
Cc: James Cowgill <james.cowgill@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/powerpc/Kconfig | 5 -----
arch/s390/Kconfig | 3 ---
arch/sparc/Kconfig | 3 ---
arch/x86/Kconfig | 4 ----
security/keys/Kconfig | 4 ++++
5 files changed, 4 insertions(+), 15 deletions(-)

--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -1082,11 +1082,6 @@ source "arch/powerpc/Kconfig.debug"

source "security/Kconfig"

-config KEYS_COMPAT
- bool
- depends on COMPAT && KEYS
- default y
-
source "crypto/Kconfig"

config PPC_LIB_RHEAP
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -346,9 +346,6 @@ config COMPAT
config SYSVIPC_COMPAT
def_bool y if COMPAT && SYSVIPC

-config KEYS_COMPAT
- def_bool y if COMPAT && KEYS
-
config SMP
def_bool y
prompt "Symmetric multi-processing support"
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -549,9 +549,6 @@ config SYSVIPC_COMPAT
depends on COMPAT && SYSVIPC
default y

-config KEYS_COMPAT
- def_bool y if COMPAT && KEYS
-
endmenu

source "net/Kconfig"
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2641,10 +2641,6 @@ config COMPAT_FOR_U64_ALIGNMENT
config SYSVIPC_COMPAT
def_bool y
depends on SYSVIPC
-
-config KEYS_COMPAT
- def_bool y
- depends on KEYS
endif

endmenu
--- a/security/keys/Kconfig
+++ b/security/keys/Kconfig
@@ -20,6 +20,10 @@ config KEYS

If you are unsure as to whether this is required, answer N.

+config KEYS_COMPAT
+ def_bool y
+ depends on COMPAT && KEYS
+
config PERSISTENT_KEYRINGS
bool "Enable register of persistent per-UID keyrings"
depends on KEYS