linux-kernel - Re: [PATCH v5 02/16] x86: Raise minimum GCC version to 8.1

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: <CAMj1kXEWJVhCrH0AzgEbBXsQYTAuwmUxR2kLJDU2vzVxx8GY-A@mail.gmail.com>
Date: Thu, 5 Dec 2024 12:44:20 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Brian Gerst <brgerst@...il.com>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org, 
	Ingo Molnar <mingo@...nel.org>, "H . Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Borislav Petkov <bp@...en8.de>, Uros Bizjak <ubizjak@...il.com>
Subject: Re: [PATCH v5 02/16] x86: Raise minimum GCC version to 8.1

On Tue, 5 Nov 2024 at 16:58, Brian Gerst <brgerst@...il.com> wrote:
>
> Stack protector support on 64-bit currently requires that the percpu
> section is linked at absolute address 0 because older compilers fixed
> the location of the canary value relative to the GS segment base.
> GCC 8.1 introduced options to change where the canary value is located,
> allowing it to be configured as a standard percpu variable.  This has
> already been done for 32-bit.  Doing the same for 64-bit will enable
> removing the code needed to suport zero-based percpu.
>
> Signed-off-by: Brian Gerst <brgerst@...il.com>
> ---
>  scripts/min-tool-version.sh | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/scripts/min-tool-version.sh b/scripts/min-tool-version.sh
> index 91c91201212c..06c4e410ecab 100755
> --- a/scripts/min-tool-version.sh
> +++ b/scripts/min-tool-version.sh
> @@ -19,6 +19,8 @@ binutils)
>  gcc)
>         if [ "$ARCH" = parisc64 ]; then
>                 echo 12.0.0
> +       elif [ "$SRCARCH" = x86 ]; then
> +               echo 8.1.0
>         else
>                 echo 5.1.0
>         fi

There appears to be consensus that we can bump this to GCC 8.1.0 for
all architectures:

https://lore.kernel.org/all/20240925150059.3955569-32-ardb+git@google.com/