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[ARM] Improve non-executable support

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Add support for detecting non-executable stack binaries, and adjust
permissions to prevent execution from data and stack areas.  Also,
ensure that READ_IMPLIES_EXEC is enabled for older CPUs where that
is true, and for any executable-stack binary.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2008-09-07 17:16:54 +01:00
committed by Russell King
parent 5ec9407dd1
commit 8ec53663d2
6 changed files with 144 additions and 57 deletions
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arch/arm/kernel/module.c
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@@ -47,7 +47,7 @@ void *module_alloc(unsigned long size)
if (!area)
return NULL;
return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
}
#else /* CONFIG_MMU */
void *module_alloc(unsigned long size)