linux-kernel - Re: [PATCH] selftests/nolibc: make stackprotector probing more robust

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Message-ID: <20250609082415.GC26391@1wt.eu>
Date: Mon, 9 Jun 2025 10:24:15 +0200
From: Willy Tarreau <w@....eu>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests/nolibc: make stackprotector probing more robust

Hi Thomas,

On Mon, Jun 09, 2025 at 09:39:16AM +0200, Thomas Weißschuh wrote:
> nolibc only supports symbol-based stackprotectors, based on the global
> variable __stack_chk_guard. Support for this differs between
> architectures and toolchains. Some use the symbol mode by default, some
> require a flag to enable it and some don't support it at all.
> 
> Before the nolibc test Makefile required the availability of
> "-mstack-protector-guard=global" to enable stackprotectors.
> While this flag makes sure that the correct mode is available it doesn't
> work where the correct mode is the only supported one and therefore the
> flag is not implemented.
> 
> Switch to a more dynamic probing mechanism.
> This correctly enables stack protectors for mips, loongarch and m68k.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>

Acked-by: Willy Tarreau <w@....eu>

Thanks,
Willy