![Filippo Arcidiacono](/assets/img/avatar_default.png)
This implements basic -fstack-protector support, based on the early ARM
version in c743f38013
. The SMP case is
limited to the initial canary value, while the UP case handles per-task
granularity (limited to 32-bit sh until a new enough sh64 compiler
manifests itself).
Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Reviewed-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
28 lines
648 B
C
28 lines
648 B
C
#ifndef __ASM_SH_STACKPROTECTOR_H
|
|
#define __ASM_SH_STACKPROTECTOR_H
|
|
|
|
#include <linux/random.h>
|
|
#include <linux/version.h>
|
|
|
|
extern unsigned long __stack_chk_guard;
|
|
|
|
/*
|
|
* Initialize the stackprotector canary value.
|
|
*
|
|
* NOTE: this must only be called from functions that never return,
|
|
* and it must always be inlined.
|
|
*/
|
|
static __always_inline void boot_init_stack_canary(void)
|
|
{
|
|
unsigned long canary;
|
|
|
|
/* Try to get a semi random initial value. */
|
|
get_random_bytes(&canary, sizeof(canary));
|
|
canary ^= LINUX_VERSION_CODE;
|
|
|
|
current->stack_canary = canary;
|
|
__stack_chk_guard = current->stack_canary;
|
|
}
|
|
|
|
#endif /* __ASM_SH_STACKPROTECTOR_H */
|