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Commit 4f198289 authored by Kees Cook's avatar Kees Cook Committed by Greg Kroah-Hartman
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lkdtm: fix stack protector trigger 



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: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7b5d4122

drivers/misc/lkdtm.c

+3 −3
Original line number Diff line number Diff line
@@ -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: {