diff options
| author | Arjan van de Ven <arjan@infradead.org> | 2008-01-30 13:34:08 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:34:08 +0100 |
| commit | edeed30589f5defe63ce6aaae56f2b7c855e4520 (patch) | |
| tree | a49736ff74dcbd3feba3c8318b204fb2165f892d /arch/x86/mm | |
| parent | adafdf6a4e45f2d1051e10aebe13025e89dbdf6d (diff) | |
x86: add testcases for RODATA and NX protections/attributes
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>
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/init_32.c | 3 | ||||
| -rw-r--r-- | arch/x86/mm/init_64.c | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index 4d1156545194..a72737c05747 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -736,6 +736,8 @@ static int noinline do_test_wp_bit(void) } #ifdef CONFIG_DEBUG_RODATA +const int rodata_test_data = 0xC3; +EXPORT_SYMBOL_GPL(rodata_test_data); void mark_rodata_ro(void) { @@ -765,6 +767,7 @@ void mark_rodata_ro(void) set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); printk("Write protecting the kernel read-only data: %luk\n", size >> 10); + rodata_test(); #ifdef CONFIG_CPA_DEBUG printk("Testing CPA: undo %lx-%lx\n", start, start + size); diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index f97ace7a55e5..50d29f5da02b 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -573,6 +573,7 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end) set_memory_rw(begin, (end - begin)/PAGE_SIZE); set_memory_np(begin, (end - begin)/PAGE_SIZE); set_memory_nx(begin, (end - begin)/PAGE_SIZE); + rodata_test(); } #endif } @@ -585,6 +586,8 @@ void free_initmem(void) } #ifdef CONFIG_DEBUG_RODATA +const int rodata_test_data = 0xC3; +EXPORT_SYMBOL_GPL(rodata_test_data); void mark_rodata_ro(void) { |