linux-kernel - Re: [PATCH v2 02/11] x86/stackprotector/64: Remove stack protector test script

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Message-ID: <CAFULd4af7Y=PZEo_WSWU7xjT6rP6iPtndLAc_puz6QqXnGjk4Q@mail.gmail.com>
Date:   Thu, 26 Oct 2023 20:06:30 +0200
From:   Uros Bizjak <ubizjak@...il.com>
To:     Brian Gerst <brgerst@...il.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 02/11] x86/stackprotector/64: Remove stack protector
 test script

On Thu, Oct 26, 2023 at 6:01 PM Brian Gerst <brgerst@...il.com> wrote:
>
> This test for the stack protector was added in 2006 to make sure the
> compiler had the PR28281 patch applied.  With GCC 5.1 being the minimum
> supported compiler now, it is no longer necessary.
>
> Signed-off-by: Brian Gerst <brgerst@...il.com>

Reviewed-by: Uros Bizjak <ubizjak@...il.com>

> ---
>  arch/x86/Kconfig                          | 2 +-
>  scripts/gcc-x86_64-has-stack-protector.sh | 4 ----
>  2 files changed, 1 insertion(+), 5 deletions(-)
>  delete mode 100755 scripts/gcc-x86_64-has-stack-protector.sh
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 039872be1630..92144c6f26d2 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -410,7 +410,7 @@ config PGTABLE_LEVELS
>
>  config CC_HAS_SANE_STACKPROTECTOR
>         bool
> -       default $(success,$(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC) $(CLANG_FLAGS)) if 64BIT
> +       default y if 64BIT
>         default $(cc-option,-mstack-protector-guard-reg=fs -mstack-protector-guard-symbol=__stack_chk_guard)
>         help
>           We have to make sure stack protector is unconditionally disabled if
> diff --git a/scripts/gcc-x86_64-has-stack-protector.sh b/scripts/gcc-x86_64-has-stack-protector.sh
> deleted file mode 100755
> index 75e4e22b986a..000000000000
> --- a/scripts/gcc-x86_64-has-stack-protector.sh
> +++ /dev/null
> @@ -1,4 +0,0 @@
> -#!/bin/sh
> -# SPDX-License-Identifier: GPL-2.0
> -
> -echo "int foo(void) { char X[200]; return 3; }" | $* -S -x c -c -m64 -O0 -mcmodel=kernel -fno-PIE -fstack-protector - -o - 2> /dev/null | grep -q "%gs"
> --
> 2.41.0
>