[ARM] disable NX support for OABI-supporting kernels

Our signal syscall restart handling for these kernels still uses
the userspace stack to build code for restarting the syscall.
Unfortunately, fixing this is non-trivial, and so for the time
being, we resolve the problem by disabling NX support.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/kernel/elf.c b/arch/arm/kernel/elf.c
index d4a0da1e48f40988bb7f92ce34664d86adb74a32..950391f194c4a9198927b4977fa49d52e08c80de 100644 (file)
--- a/arch/arm/kernel/elf.c
+++ b/arch/arm/kernel/elf.c
@@ -78,6 +78,15 @@ int arm_elf_read_implies_exec(const struct elf32_hdr *x, int executable_stack)
                return 1;
        if (cpu_architecture() < CPU_ARCH_ARMv6)
                return 1;
+#if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
+       /*
+        * If we have support for OABI programs, we can never allow NX
+        * support - our signal syscall restart mechanism relies upon
+        * being able to execute code placed on the user stack.
+        */
+       return 1;
+#else
        return 0;
+#endif
 }
 EXPORT_SYMBOL(arm_elf_read_implies_exec);