linux-kernel - Re: [PATCH v4 02/16] x86/stackprotector/64: Remove stack protector test script

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Date: Sat, 23 Mar 2024 18:01:15 +0100
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>, David.Laight@...lab.com
Subject: Re: [PATCH v4 02/16] x86/stackprotector/64: Remove stack protector
 test script

On Fri, Mar 22, 2024 at 5:52 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                          | 5 ++---
>  scripts/gcc-x86_64-has-stack-protector.sh | 4 ----
>  2 files changed, 2 insertions(+), 7 deletions(-)
>  delete mode 100755 scripts/gcc-x86_64-has-stack-protector.sh
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index f326903cbe67..88d72227e3cb 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -411,12 +411,11 @@ 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
> -         the compiler produces broken code or if it does not let us control
> -         the segment on 32-bit kernels.
> +         the compiler does not allow control of the segment and symbol.
>
>  menu "Processor type and features"
>
> 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"
> --
> 2.44.0
>