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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2009-05-23 11:36:20 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-05-23 11:36:20 +0100
commit14f0aa359365e8a93a77b71e3b840274b9b4dcb1 (patch)
tree30493ede1ced950b084c9c9083e6ee28803fc5a5 /arch/arm/kernel
parent355532bdda14a7162cee55fdd67600bf9bc9a152 (diff)
[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>
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/elf.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/kernel/elf.c b/arch/arm/kernel/elf.c
index d4a0da1e48f4..950391f194c4 100644
--- 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);