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lkdtm: fix stack protector trigger

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The -fstack-protector compiler flag will only build stack protections if
a character array is seen. Additionally, the offset to the saved
instruction pointer changes based on architecture, so stomp much harder
(64 bytes) when corrupting the stack.

Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Kees Cook 2013-07-08 10:01:30 -07:00 • committed by Greg Kroah-Hartman
commit 4f19828974
1 changed files with 3 additions and 3 deletions
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6
drivers/misc/lkdtm.c
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@ -295,10 +295,10 @@ static void lkdtm_do_action(enum ctype which)
(void) recursive_loop(0);
break;
case CT_CORRUPT_STACK: {
volatile u32 data[8];
volatile u32 *p = data;
/* Make sure the compiler creates and uses an 8 char array. */
volatile char data[8];
p[12] = 0x12345678;
memset((void *)data, 0, 64);
break;
}
case CT_UNALIGNED_LOAD_STORE_WRITE: {