From: Alexey Dobriyan <adobriyan@gmail.com>
To: Willy Tarreau <w@1wt.eu>
Cc: "Thomas Weißschuh" <linux@weissschuh.net>,
"Paul E. McKenney" <paulmck@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 6/8] tools/nolibc: tests: add test for -fstack-protector
Date: Sun, 26 Mar 2023 21:30:18 +0300 [thread overview]
Message-ID: <89a960c7-0c9b-43ab-9fc8-a68405f7ed6a@p183> (raw)
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.
next reply other threads:[~2023-03-26 18:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-26 18:30 Alexey Dobriyan [this message]
2023-03-26 18:42 ` Thomas Weißschuh
2023-03-26 18:45 ` Willy Tarreau
2023-03-26 19:38 ` Alexey Dobriyan
2023-03-26 19:42 ` Willy Tarreau
2023-03-27 15:32 ` Alexey Dobriyan
2023-03-27 15:54 ` Willy Tarreau
2023-03-27 23:20 ` Thomas Weißschuh
2023-03-28 4:59 ` Willy Tarreau
-- strict thread matches above, loose matches on Subject: below --
2023-03-25 15:45 [PATCH 0/8] tools/nolibc: add support for stack protector Willy Tarreau
2023-03-25 15:45 ` [PATCH 6/8] tools/nolibc: tests: add test for -fstack-protector Willy Tarreau
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