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@android.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Eric Paris <eparis@redhat.com>
Acked-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/security/Kconfig b/security/Kconfig
index e9c6ac7..beb86b5 100644 (file)
--- 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