lkml.org 
[lkml]   [2023]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 6/8] tools/nolibc: tests: add test for -fstack-protector
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!

asm(
".globl f\n"
"f:\n"
"movq $0, (%rsp)\n"
"ret\n"
".type f,@function\n"
".size f,.-f"
);

No problems with optimisation levels.

\
 
 \ /
  Last update: 2023-03-27 01:18    [W:0.055 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site