| 1 |
|
| 2 | |
| 3 | * GCC stack protector support.
|
| 4 | *
|
| 5 | * Stack protector works by putting predefined pattern at the start of
|
| 6 | * the stack frame and verifying that it hasn't been overwritten when
|
| 7 | * returning from the function. The pattern is called stack canary and
|
| 8 | * on LoongArch gcc expects it to be defined by a global variable called
|
| 9 | * "__stack_chk_guard".
|
| 10 |
|
| 11 |
|
| 12 | #ifndef _ASM_STACKPROTECTOR_H
|
| 13 | #define _ASM_STACKPROTECTOR_H
|
| 14 |
|
| 15 | extern unsigned long __stack_chk_guard;
|
| 16 |
|
| 17 | |
| 18 | * Initialize the stackprotector canary value.
|
| 19 | *
|
| 20 | * NOTE: this must only be called from functions that never return,
|
| 21 | * and it must always be inlined.
|
| 22 |
|
| 23 | static __always_inline void boot_init_stack_canary(void)
|
| 24 | {
|
| 25 | unsigned long canary = get_random_canary();
|
| 26 |
|
| 27 | current->stack_canary = canary;
|
| 28 | __stack_chk_guard = current->stack_canary;
|
| 29 | }
|
| 30 |
|
| 31 | #endif
|