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| author | Kees Cook <keescook@chromium.org> | 2013-07-08 10:01:30 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-24 22:47:19 -0700 |
| commit | 4f198289747f0391bc5a5574279b1791a8ca2d06 (patch) | |
| tree | fcc306d3c263d6b13b10d7b3c3d36b96c161d1f5 /drivers/misc/lkdtm.c | |
| parent | 7b5d4122d39f7c26ce42806b7a67cf04537545e6 (diff) | |
| download | linux-4f198289747f0391bc5a5574279b1791a8ca2d06.tar.gz linux-4f198289747f0391bc5a5574279b1791a8ca2d06.tar.bz2 linux-4f198289747f0391bc5a5574279b1791a8ca2d06.zip | |
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: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/lkdtm.c')
| -rw-r--r-- | drivers/misc/lkdtm.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c index 08aad69c8da4..adb6bde2ecc2 100644 --- a/drivers/misc/lkdtm.c +++ b/drivers/misc/lkdtm.c @@ -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: { |