9e01e8fd27
RELR is a relocation packing format for relative relocations. The format is described in a generic-abi proposal: https://groups.google.com/d/topic/generic-abi/bX460iggiKg/discussion The LLD linker can be instructed to pack relocations in the RELR format by passing the flag --pack-dyn-relocs=relr. This patch adds a new config option, CONFIG_RELR. Enabling this option instructs the linker to pack vmlinux's relative relocations in the RELR format, and causes the kernel to apply the relocations at startup along with the RELA relocations. RELA relocations still need to be applied because the linker will emit RELA relative relocations if they are unrepresentable in the RELR format (i.e. address not a multiple of 2). Enabling CONFIG_RELR reduces the size of a defconfig kernel image with CONFIG_RANDOMIZE_BASE by 3.5MB/16% uncompressed, or 550KB/5% compressed (lz4). Signed-off-by: Peter Collingbourne <pcc@google.com> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Will Deacon <will@kernel.org> (cherry picked from commit 5cf896fb6be3effd9aea455b22213e27be8bdb1d) Bug: 137200966 Test: booted defconfig + CONFIG_RELR kernel on qemu Change-Id: I4c55bf5b10bc6c934543c651eca9fc8e260ffc6d Signed-off-by: Peter Collingbourne <pcc@google.com>
16 lines
526 B
Bash
Executable file
16 lines
526 B
Bash
Executable file
#!/bin/sh -eu
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# SPDX-License-Identifier: GPL-2.0
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tmp_file=$(mktemp)
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trap "rm -f $tmp_file.o $tmp_file $tmp_file.bin" EXIT
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cat << "END" | "$CC" -c -x c - -o $tmp_file.o >/dev/null 2>&1
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void *p = &p;
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END
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"$LD" $tmp_file.o -shared -Bsymbolic --pack-dyn-relocs=relr -o $tmp_file
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# Despite printing an error message, GNU nm still exits with exit code 0 if it
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# sees a relr section. So we need to check that nothing is printed to stderr.
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test -z "$("$NM" $tmp_file 2>&1 >/dev/null)"
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"$OBJCOPY" -O binary $tmp_file $tmp_file.bin
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