From: Will Deacon <will@kernel.org>
To: linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>
Cc: catalin.marinas@arm.com, kernel-team@android.com,
Mark Rutland <mark.rutland@arm.com>,
Nathan Chancellor <nathan@kernel.org>,
Kees Cook <keescook@chromium.org>,
"Mohan Rao .vanimina" <mailtoc.mohanrao@gmail.com>,
Sami Tolvanen <samitolvanen@google.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] vmlinux.lds.h: CFI: Reduce alignment of jump-table to function alignment
Date: Fri, 23 Sep 2022 16:40:48 +0100 [thread overview]
Message-ID: <166393672765.2853144.1045935840794664678.b4-ty@kernel.org> (raw)
In-Reply-To: <20220922215715.13345-1-will@kernel.org>
On Thu, 22 Sep 2022 22:57:15 +0100, Will Deacon wrote:
> Due to undocumented, hysterical raisins on x86, the CFI jump-table
> sections in .text are needlessly aligned to PMD_SIZE in the vmlinux
> linker script. When compiling a CFI-enabled arm64 kernel with a 64KiB
> page-size, a PMD maps 512MiB of virtual memory and so the .text section
> increases to a whopping 940MiB and blows the final Image up to 960MiB.
> Others report a link failure.
>
> [...]
Applied to arm64 (for-next/fixes), thanks!
[1/1] vmlinux.lds.h: CFI: Reduce alignment of jump-table to function alignment
https://git.kernel.org/arm64/c/13b056696291
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
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prev parent reply other threads:[~2022-09-23 15:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-22 21:57 [PATCH] vmlinux.lds.h: CFI: Reduce alignment of jump-table to function alignment Will Deacon
2022-09-22 22:00 ` Sami Tolvanen
2022-09-22 22:18 ` Kees Cook
2022-09-23 12:24 ` Mark Rutland
2022-09-23 15:40 ` Will Deacon [this message]
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