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x86: add testcases for RODATA and NX protections/attributes

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Latest update; I now have 4 NX tests, but 2 fail so they're #if 0'd.
I also cleaned up the NX test code quite a bit, and got rid of the ugly
exception table sorting stuff.

From: Arjan van de Ven <arjan@linux.intel.com>

This patch adds testcases for the CONFIG_DEBUG_RODATA configuration option
as well as the NX CPU feature/mappings. Both testcases can move to tests/
once that patch gets merged into mainline.
(I'm half considering moving the rodata test into mm/init.c but I'll
wait with that until init.c is unified)

As part of this I had to fix a not-quite-right alignment in the vmlinux.lds.h
for the RODATA sections, which lead to 1 page less being marked read only.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Arjan van de Ven 2008-01-30 13:34:08 +01:00 • committed by Ingo Molnar
commit edeed30589
6 changed files with 276 additions and 0 deletions
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1
include/asm-generic/vmlinux.lds.h
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@ -184,6 +184,7 @@
VMLINUX_SYMBOL(__start___param) = .; \
*(__param) \
VMLINUX_SYMBOL(__stop___param) = .; \
. = ALIGN((align)); \
VMLINUX_SYMBOL(__end_rodata) = .; \
} \
. = ALIGN((align));

7
include/asm-x86/cacheflush.h
View file

@ -47,5 +47,12 @@ void clflush_cache_range(void *addr, int size);
#ifdef CONFIG_DEBUG_RODATA
void mark_rodata_ro(void);
#endif
#ifdef CONFIG_DEBUG_RODATA_TEST
void rodata_test(void);
#else
static inline void rodata_test(void)
{
}
#endif
#endif