linux-kernel - Re: [PATCH] scripts/mksysmap: Fix badly escaped '$'

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Message-ID: <CAK7LNAQNTaTA8x-nNAGSOnYhZZUks_QY2VVNB-W1LJ2EnjUDDg@mail.gmail.com>
Date:   Wed, 7 Jun 2023 21:26:52 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Pierre-Clément Tosi <ptosi@...gle.com>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] scripts/mksysmap: Fix badly escaped '$'

On Wed, Jun 7, 2023 at 2:36 AM Pierre-Clément Tosi <ptosi@...gle.com> wrote:
>
> The backslash characters escaping '$' in the command to sed (intended to
> prevent it from interpreting '$' as "end-of-line") are currently being
> consumed by the Shell (where they mean that sh should not evaluate what
> follows '$' as a variable name). This means that
>
>     sed -e "/ \$/d"
>
> executes the script
>
>     / $/d
>
> instead of the intended
>
>     / \$/d
>
> So escape twice in mksysmap any '$' that actually needs to reach sed
> escaped so that the backslash survives the Shell.



You are right. Thanks for catching this bug.

Applied to linux-kbuild. Thanks.




>
> Fixes: c4802044a0a7 ("scripts/mksysmap: use sed with in-line comments")
> Fixes: 320e7c9d4494 ("scripts/kallsyms: move compiler-generated symbol patterns to mksysmap")
> Signed-off-by: Pierre-Clément Tosi <ptosi@...gle.com>
> ---
>  scripts/mksysmap | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/mksysmap b/scripts/mksysmap
> index cb3b1fff3eee..ec3338526102 100755
> --- a/scripts/mksysmap
> +++ b/scripts/mksysmap
> @@ -32,7 +32,7 @@ ${NM} -n ${1} | sed >${2} -e "
>  #  (do not forget a space before each pattern)
>
>  # local symbols for ARM, MIPS, etc.
> -/ \$/d
> +/ \\$/d
>
>  # local labels, .LBB, .Ltmpxxx, .L__unnamed_xx, .LASANPC, etc.
>  / \.L/d
> @@ -41,7 +41,7 @@ ${NM} -n ${1} | sed >${2} -e "
>  / __efistub_/d
>
>  # arm64 local symbols in non-VHE KVM namespace
> -/ __kvm_nvhe_\$/d
> +/ __kvm_nvhe_\\$/d
>  / __kvm_nvhe_\.L/d
>
>  # arm64 lld
> --
> 2.41.0.rc0.172.g3f132b7071-goog
>
>
> --
> Pierre



-- 
Best Regards
Masahiro Yamada