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mm: add arch-independent testcases for RODATA

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This patch makes arch-independent testcases for RODATA.  Both x86 and
x86_64 already have testcases for RODATA, But they are arch-specific
because using inline assembly directly.

And cacheflush.h is not a suitable location for rodata-test related
things.  Since they were in cacheflush.h, If someone change the state of
CONFIG_DEBUG_RODATA_TEST, It cause overhead of kernel build.

To solve the above issues, write arch-independent testcases and move it
to shared location.

[[email protected]: fix config dependency]
  Link: http://lkml.kernel.org/r/20170209131625.GA16954@pjb1027-Latitude-E5410
Link: http://lkml.kernel.org/r/20170129105436.GA9303@pjb1027-Latitude-E5410
Signed-off-by: Jinbum Park <[email protected]>
Acked-by: Kees Cook <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Laura Abbott <[email protected]>
Cc: Russell King <[email protected]>
Cc: Valentin Rothberg <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jinbum Park 2017-02-27 14:30:22 -08:00 • committed by Linus Torvalds
commit 2959a5f726
11 changed files with 90 additions and 105 deletions
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6
init/main.c
View file

@ -82,6 +82,7 @@
#include <linux/proc_ns.h>
#include <linux/io.h>
#include <linux/cache.h>
#include <linux/rodata_test.h>
#include <asm/io.h>
#include <asm/bugs.h>
@ -935,9 +936,10 @@ __setup("rodata=", set_debug_rodata);
#ifdef CONFIG_STRICT_KERNEL_RWX
static void mark_readonly(void)
{
if (rodata_enabled)
if (rodata_enabled) {
mark_rodata_ro();
else
rodata_test();
} else
pr_info("Kernel memory protection disabled.\n");
}
#else