linux-kernel - [PATCH] security: select correct default LSM_MMAP_MIN

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Message-Id: <1391480133-27149-1-git-send-email-ccross@android.com>
Date:	Mon,  3 Feb 2014 18:15:32 -0800
From:	Colin Cross <ccross@...roid.com>
To:	linux-kernel@...r.kernel.org
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Colin Cross <ccross@...roid.com>,
	James Morris <james.l.morris@...cle.com>,
	linux-security-module@...r.kernel.org (open list:SECURITY SUBSYSTEM)
Subject: [PATCH] security: select correct default LSM_MMAP_MIN_ADDR on arm on arm64

Binaries compiled for arm may run on arm64 if CONFIG_COMPAT is
selected.  Set LSM_MMAP_MIN_ADDR to 32768 if ARM64 && COMPAT to
prevent selinux failures launching 32-bit static executables that
are mapped at 0x8000.

Signed-off-by: Colin Cross <ccross@...roid.com>
---
 security/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/Kconfig b/security/Kconfig
index e9c6ac724fef..beb86b500adf 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -103,7 +103,7 @@ config INTEL_TXT
 config LSM_MMAP_MIN_ADDR
 	int "Low address space for LSM to protect from user allocation"
 	depends on SECURITY && SECURITY_SELINUX
-	default 32768 if ARM
+	default 32768 if ARM || (ARM64 && COMPAT)
 	default 65536
 	help
 	  This is the portion of low virtual memory which should be protected
-- 
1.9.0.rc1.175.g0b1dcb5

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