linux-kernel - Re: [PATCH] arm64/module: set trampoline section flags regardless of CONFIG_DYNAMIC

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Date:   Wed,  2 Sep 2020 08:37:02 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Jessica Yu <jeyu@...nel.org>, linux-kernel@...r.kernel.org
Cc:     Will Deacon <will@...nel.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Szabolcs Nagy <szabolcs.nagy@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Ard Biesheuvel <ardb@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [PATCH] arm64/module: set trampoline section flags regardless of CONFIG_DYNAMIC_FTRACE

On Tue, 1 Sep 2020 18:00:16 +0200, Jessica Yu wrote:
> In the arm64 module linker script, the section .text.ftrace_trampoline
> is specified unconditionally regardless of whether CONFIG_DYNAMIC_FTRACE
> is enabled (this is simply due to the limitation that module linker
> scripts are not preprocessed like the vmlinux one).
> 
> Normally, for .plt and .text.ftrace_trampoline, the section flags
> present in the module binary wouldn't matter since module_frob_arch_sections()
> would assign them manually anyway. However, the arm64 module loader only
> sets the section flags for .text.ftrace_trampoline when CONFIG_DYNAMIC_FTRACE=y.
> That's only become problematic recently due to a recent change in
> binutils-2.35, where the .text.ftrace_trampoline section (along with the
> .plt section) is now marked writable and executable (WAX).
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64/module: set trampoline section flags regardless of CONFIG_DYNAMIC_FTRACE
      https://git.kernel.org/arm64/c/e0328feda79d

-- 
Catalin