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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <8e156377-e7d9-48ec-a7ee-292aba002201@t-8ch.de>
Date:   Sun, 26 Mar 2023 13:42:35 -0500 (EST)
From:   Thomas Weißschuh  <thomas@...ch.de>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     Willy Tarreau <w@....eu>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/8] tools/nolibc: tests: add test for -fstack-protector


Mar 26, 2023 13:30:21 Alexey Dobriyan <adobriyan@...il.com>:

> 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?