From: Will Deacon <will@kernel.org>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: mark.rutland@arm.com, catalin.marinas@arm.com,
james.morse@arm.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 3/4] arm64/head: avoid symbol names pointing into first 64 KB of kernel image
Date: Wed, 28 Oct 2020 14:12:23 +0000 [thread overview]
Message-ID: <20201028141223.GD28554@willie-the-truck> (raw)
In-Reply-To: <20201027073209.2897-4-ardb@kernel.org>
On Tue, Oct 27, 2020 at 08:32:08AM +0100, Ard Biesheuvel wrote:
> We no longer map the first 64 KB of the kernel image, as there is nothing
> there that we ever need to refer back to once the kernel has booted. Even
> though facilities like kallsyms are very careful to only refer to the
> region that starts at _stext when mapping virtual addresses to symbol
> names, let's avoid any confusion by switching to local .L prefixed symbol
> names for the EFI header, as none of them have any significance to the
> rest of the kernel.
>
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> ---
> arch/arm64/kernel/efi-header.S | 46 ++++++++++----------
> 1 file changed, 22 insertions(+), 24 deletions(-)
Acked-by: Will Deacon <will@kernel.org>
Will
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next prev parent reply other threads:[~2020-10-28 14:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-27 7:32 [PATCH 0/4] arm64: head: pad Image header to 64 KB and unmap it Ard Biesheuvel
2020-10-27 7:32 ` [PATCH 1/4] arm64: efi: increase EFI PE/COFF header padding to 64 KB Ard Biesheuvel
2020-10-27 7:32 ` [PATCH 2/4] arm64: omit [_text, _stext) from permanent kernel mapping Ard Biesheuvel
2020-10-28 14:10 ` Will Deacon
2020-10-27 7:32 ` [PATCH 3/4] arm64/head: avoid symbol names pointing into first 64 KB of kernel image Ard Biesheuvel
2020-10-28 14:12 ` Will Deacon [this message]
2020-10-27 7:32 ` [PATCH 4/4] arm64: head: tidy up the Image header definition Ard Biesheuvel
2020-10-28 14:17 ` Will Deacon
2020-10-28 17:56 ` Robin Murphy
2020-10-29 7:30 ` Ard Biesheuvel
2020-10-29 13:06 ` Robin Murphy
2020-11-03 7:13 ` Ard Biesheuvel
2020-11-04 11:29 ` Robin Murphy
2020-10-28 15:12 ` [PATCH 0/4] arm64: head: pad Image header to 64 KB and unmap it Will Deacon
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