mirror of
https://github.com/dynup/kpatch
synced 2025-01-21 12:22:47 +00:00
1330b4a3e5
When building the patched version of the kernel, vmlinux has to be
linked with the '--warn-unresolved-symbols' linker flag. Otherwise the
link will fail if the patch uses kpatch-specific symbols like
kpatch_shadow_alloc() and friends.
As of upstream Linux commit b36fad65d61f ("kbuild: Initialize exported
variables"), LDFLAGS_vmlinux= no longer works from the command line,
resulting in '--warn-unresolved-symbols' no longer getting set.
Instead we can use kpatch-gcc to pass the flag to the linker.
Fixes #627.
75 lines
1.4 KiB
Bash
Executable File
75 lines
1.4 KiB
Bash
Executable File
#!/bin/bash
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set -x
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TOOLCHAINCMD="$1"
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shift
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if [[ -z "$KPATCH_GCC_TEMPDIR" ]]; then
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exec "$TOOLCHAINCMD" "$@"
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fi
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declare -a args=("$@")
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if [[ "$TOOLCHAINCMD" = "gcc" ]] ; then
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while [ "$#" -gt 0 ]; do
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if [ "$1" = "-o" ]; then
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obj=$2
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[[ $2 = */.tmp_*.o ]] && obj=${2/.tmp_/}
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case "$obj" in
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*.mod.o|\
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*built-in.o|\
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vmlinux.o|\
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.tmp_kallsyms1.o|\
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.tmp_kallsyms2.o|\
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init/version.o|\
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arch/x86/boot/version.o|\
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arch/x86/boot/compressed/eboot.o|\
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arch/x86/boot/header.o|\
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arch/x86/boot/compressed/efi_stub_64.o|\
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arch/x86/boot/compressed/piggy.o|\
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kernel/system_certificates.o|\
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arch/x86/vdso/*|\
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arch/x86/entry/vdso/*|\
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drivers/firmware/efi/libstub/*|\
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.*.o)
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break
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;;
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*.o)
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mkdir -p "$KPATCH_GCC_TEMPDIR/orig/$(dirname $obj)"
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[[ -e $obj ]] && cp -f "$obj" "$KPATCH_GCC_TEMPDIR/orig/$obj"
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echo "$obj" >> "$KPATCH_GCC_TEMPDIR/changed_objs"
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break
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;;
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*)
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break
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;;
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esac
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fi
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shift
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done
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elif [[ "$TOOLCHAINCMD" = "ld" ]] ; then
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while [ "$#" -gt 0 ]; do
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if [ "$1" = "-o" ]; then
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obj=$2
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case "$obj" in
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*.ko)
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mkdir -p "$KPATCH_GCC_TEMPDIR/module/$(dirname $obj)"
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cp -f "$obj" "$KPATCH_GCC_TEMPDIR/module/$obj"
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break
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;;
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.tmp_vmlinux*|vmlinux)
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args+=(--warn-unresolved-symbols)
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break
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;;
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*)
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break
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;;
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esac
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fi
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shift
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done
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fi
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exec "$TOOLCHAINCMD" "${args[@]}"
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