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From cc318cd6ccfe9833ab9c1cde4041ac5dd9f97a3b Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Tue, 21 Feb 2023 09:16:29 +0100
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Subject: [PATCH] efi: drop executable-stack bit from .elf file
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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An rpminspect test in Fedora/RHEL is flagging our stub files as having an
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executable stack. The check is correct:
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$ readelf --wide --program-headers build/src/boot/efi/linuxx64.elf.stub | rg -i stack
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GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RWE 0x10
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It seems to be just an omission in the linker script… None of the objects that
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are linked into the stub are marked as requiring an executable stack:
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$ readelf --wide --sections build/src/boot/efi/*.c.o \
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/usr/lib/gnuefi/x64/libgnuefi.a \
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/usr/lib/gnuefi/x64/libefi.a \
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/usr/lib/gcc/x86_64-redhat-linux/12/libgcc.a \
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| rg '.note.GNU-stack.*X'
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(nothing)
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On aarch64 we end up with a nonexecutable stack, but on ia32 and x64 we get one,
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so this might be just a matter of defaults in the linker. It doesn't matter
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greatly, but let's mark the stack as non-executable to avoid the warning.
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Note: '-Wl,-z' is not needed, things work with just '-z'.
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RHEL-only
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for now, as the patch is not yet in upstream
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https://github.com/systemd/systemd/pull/26511
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Related: #2140646
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---
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src/boot/efi/meson.build | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/src/boot/efi/meson.build b/src/boot/efi/meson.build
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index 0de43993a4..00f3361d66 100644
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--- a/src/boot/efi/meson.build
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+++ b/src/boot/efi/meson.build
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@@ -266,6 +266,7 @@ efi_ldflags = [
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'-Wl,--warn-common',
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'-Wl,-Bsymbolic',
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'-z', 'nocombreloc',
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+ '-z', 'noexecstack',
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efi_crt0,
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]
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