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65e1f38d9a
When the CC variable contains quotes, e.g. when using
ccache (make CC="ccache <compiler>"), this script always
fails, so CONFIG_RELR is never enabled, even when the
toolchain supports this feature. Removing the /dev/null
redirect and invoking the script manually shows the issue:
$ CC='/usr/bin/ccache clang' ./scripts/tools-support-relr.sh
./scripts/tools-support-relr.sh: 7: ./scripts/tools-support-relr.sh: /usr/bin/ccache clang: not found
Fix this by un-quoting the variables.
Before:
$ make ARCH=arm64 CC='/usr/bin/ccache clang' LD=ld.lld \
NM=llvm-nm OBJCOPY=llvm-objcopy defconfig
$ grep RELR .config
CONFIG_ARCH_HAS_RELR=y
With this change:
$ make ARCH=arm64 CC='/usr/bin/ccache clang' LD=ld.lld \
NM=llvm-nm OBJCOPY=llvm-objcopy defconfig
$ grep RELR .config
CONFIG_TOOLS_SUPPORT_RELR=y
CONFIG_ARCH_HAS_RELR=y
CONFIG_RELR=y
Fixes: 5cf896fb6b ("arm64: Add support for relocating the kernel with RELR relocations")
Reported-by: Dmitry Golovin <dima@golovin.in>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/769
Cc: Peter Collingbourne <pcc@google.com>
Signed-off-by: Ilie Halip <ilie.halip@gmail.com>
Signed-off-by: Will Deacon <will@kernel.org>
16 lines
518 B
Bash
Executable file
16 lines
518 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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