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authorMasahiro Yamada <masahiroy@kernel.org>2021-12-14 05:53:52 +0300
committerMasahiro Yamada <masahiroy@kernel.org>2022-01-08 11:46:36 +0300
commit7d153696e5db1e37387c2f7ec06ffc8d4aac70a4 (patch)
tree82b376d8534505b539974f8fbb8204b962fe7c53 /scripts/setlocalversion
parentb8c96a6b466ca3b91530a4ec7f7404f40f8f4d0b (diff)
downloadlinux-7d153696e5db1e37387c2f7ec06ffc8d4aac70a4.tar.xz
kbuild: do not include include/config/auto.conf from shell scripts
Richard Weinberger pointed out the risk of sourcing the kernel config from shell scripts [1], and proposed some patches [2], [3]. It is a good point, but it took a long time because I was wondering how to fix this. This commit goes with simple grep approach because there are only a few scripts including the kernel configuration. scripts/link_vmlinux.sh has references to a bunch of CONFIG options, all of which are boolean. I added is_enabled() helper as scripts/package/{mkdebian,builddeb} do. scripts/gen_autoksyms.sh uses 'eval', stating "to expand the whitelist path". I removed it since it is the issue we are trying to fix. I was a bit worried about the cost of invoking the grep command over again. I extracted the grep parts from it, and measured the cost. It was approximately 0.03 sec, which I hope is acceptable. [test code] $ cat test-grep.sh #!/bin/sh is_enabled() { grep -q "^$1=y" include/config/auto.conf } is_enabled CONFIG_LTO_CLANG is_enabled CONFIG_LTO_CLANG is_enabled CONFIG_STACK_VALIDATION is_enabled CONFIG_UNWINDER_ORC is_enabled CONFIG_FTRACE_MCOUNT_USE_OBJTOOL is_enabled CONFIG_VMLINUX_VALIDATION is_enabled CONFIG_FRAME_POINTER is_enabled CONFIG_GCOV_KERNEL is_enabled CONFIG_LTO_CLANG is_enabled CONFIG_RETPOLINE is_enabled CONFIG_X86_SMAP is_enabled CONFIG_LTO_CLANG is_enabled CONFIG_VMLINUX_MAP is_enabled CONFIG_KALLSYMS_ALL is_enabled CONFIG_KALLSYMS_ABSOLUTE_PERCPU is_enabled CONFIG_KALLSYMS_BASE_RELATIVE is_enabled CONFIG_DEBUG_INFO_BTF is_enabled CONFIG_KALLSYMS is_enabled CONFIG_DEBUG_INFO_BTF is_enabled CONFIG_BPF is_enabled CONFIG_BUILDTIME_TABLE_SORT is_enabled CONFIG_KALLSYMS $ time ./test-grep.sh real 0m0.036s user 0m0.027s sys m0.009s [1]: https://lore.kernel.org/all/1919455.eZKeABUfgV@blindfold/ [2]: https://lore.kernel.org/all/20180219092245.26404-1-richard@nod.at/ [3]: https://lore.kernel.org/all/20210920213957.1064-2-richard@nod.at/ Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Nicolas Schier <n.schier@avm.de>
Diffstat (limited to 'scripts/setlocalversion')
-rwxr-xr-xscripts/setlocalversion9
1 files changed, 4 insertions, 5 deletions
diff --git a/scripts/setlocalversion b/scripts/setlocalversion
index 6b54e46a0f12..d06137405190 100755
--- a/scripts/setlocalversion
+++ b/scripts/setlocalversion
@@ -111,9 +111,7 @@ if $scm_only; then
exit
fi
-if test -e include/config/auto.conf; then
- . include/config/auto.conf
-else
+if ! test -e include/config/auto.conf; then
echo "Error: kernelrelease not valid - run 'make prepare' to update it" >&2
exit 1
fi
@@ -125,10 +123,11 @@ if test ! "$srctree" -ef .; then
fi
# CONFIG_LOCALVERSION and LOCALVERSION (if set)
-res="${res}${CONFIG_LOCALVERSION}${LOCALVERSION}"
+config_localversion=$(sed -n 's/^CONFIG_LOCALVERSION="\(.*\)"$/\1/p' include/config/auto.conf)
+res="${res}${config_localversion}${LOCALVERSION}"
# scm version string if not at a tagged commit
-if test "$CONFIG_LOCALVERSION_AUTO" = "y"; then
+if grep -q "^CONFIG_LOCALVERSION_AUTO=y$" include/config/auto.conf; then
# full scm version string
res="$res$(scm_version)"
elif [ "${LOCALVERSION+set}" != "set" ]; then