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lkdtm: isolate stack corruption test 

When tests were added to lkdtm that grew the stack frame, the stack
corruption test stopped working. This isolates the test in its own
function, and forces it not to be inlined.

Signed-off-by: Kees Cook <keescook@chromium.org>
Fixes: cc33c537c1 ("lkdtm: add "EXEC_*" triggers")
Cc: stable <stable@vger.kernel.org> # 3.12
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2013-10-24 18:05:42 -07:00 committed by Greg Kroah-Hartman
parent eec86b8e85
commit 629c66a22c
1 changed files with 10 additions and 6 deletions
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16
drivers/misc/lkdtm.c
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@ -297,6 +297,14 @@ static void do_nothing(void)
return;
}
static noinline void corrupt_stack(void)
{
/* Use default char array length that triggers stack protection. */
char data[8];
memset((void *)data, 0, 64);
}
static void execute_location(void *dst)
{
void (*func)(void) = dst;
@ -327,13 +335,9 @@ static void lkdtm_do_action(enum ctype which)
case CT_OVERFLOW:
(void) recursive_loop(0);
break;
case CT_CORRUPT_STACK: {
/* Make sure the compiler creates and uses an 8 char array. */
volatile char data[8];
memset((void *)data, 0, 64);
case CT_CORRUPT_STACK:
corrupt_stack();
break;
}
case CT_UNALIGNED_LOAD_STORE_WRITE: {
static u8 data[5] __attribute__((aligned(4))) = {1, 2,
3, 4, 5};