Re: [PATCH 6/8] tools/nolibc: tests: add test for -fstack-protector

[Thomas Weißschuh]

Mar 26, 2023 13:30:21 Alexey Dobriyan <adobriyan@xxxxxxxxx>:

> Willy Tarreau wrote:
>> #if defined(__clang__)
>> __attribute__((optnone))
>> #elif defined(__GNUC__)
>> __attribute__((optimize("O0")))
>> #endif
>> static int smash_stack(void)
>> {
>>     char buf[100];
>>
>>     for (size_t i = 0; i < 200; i++)
>>         buf[i] = 'P';
>>
>>     return 1;
>> }
>
> If you want to corrupt the stack, corrupt the stack!

I do!

> asm(
> ".globl f\n"
> "f:\n"
> "movq $0, (%rsp)\n"
> "ret\n"
> ".type f,@function\n"
> ".size f,.-f"
> );
> > No problems with optimisation levels.

Wouldn't this be architecture-specific?