mirror of
https://github.com/ARM-software/arm-trusted-firmware.git
synced 2025-04-16 09:34:18 +00:00
cfa466ab73
This commit changes ENABLE_STACK_PROTECTOR value to "strong" for enabling the stack protector by canary. Signed-off-by: Koichi Yamaguchi <koichi.yamaguchi.zb@hitachi.com> Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com> Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com> Change-Id: Ice351d23c98daf12737a5e65cef743035d62dabe
36 lines
800 B
C
36 lines
800 B
C
/*
|
|
* Copyright (c) 2021-2023, Renesas Electronics Corporation. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <arch_helpers.h>
|
|
#include <common/debug.h>
|
|
|
|
#define RANDOM_CANARY_VALUE ((u_register_t)0xDFF5FC8A720E205EULL)
|
|
|
|
u_register_t plat_get_stack_protector_canary(void)
|
|
{
|
|
u_register_t cnt;
|
|
u_register_t seed;
|
|
u_register_t mul;
|
|
u_register_t ret;
|
|
uintptr_t val1 = (uintptr_t)__builtin_return_address(0U);
|
|
uintptr_t val2 = (uintptr_t)__builtin_frame_address(0U);
|
|
|
|
cnt = read_cntpct_el0();
|
|
seed = (cnt ^ RANDOM_CANARY_VALUE) & ULONG_MAX;
|
|
ret = seed;
|
|
|
|
if ((ULONG_MAX/val1) > seed) {
|
|
mul = (u_register_t)(val1 * seed);
|
|
if ((mul < ULONG_MAX) &&
|
|
((ULONG_MAX - (u_register_t)mul) > val2)) {
|
|
ret = mul + val2;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|