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kernel: use iremap for assembly

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Currently assembly code of the Kernel may contain the build path, resulting in
unreproducible firmware images (and Kernels). Fix this by adding a iremap
KAFLAG.

Before:

    strings "/path/to/vmlinux" | grep linux-6.18.38
    /path/to/openwrt/build_dir/target-x86_64_musl/linux-x86_64/linux-6.18.38
    /path/to/openwrt/build_dir/target-x86_64_musl/linux-x86_64/linux-6.18.38

After

    strings "/path/to/vmlinux" | grep linux-6.18.38
    target-x86_64_musl/linux-x86_64/linux-6.18.38
    target-x86_64_musl/linux-x86_64/linux-6.18.38

Link: https://github.com/openwrt/openwrt/pull/24271
Signed-off-by: Paul Spooren <mail@aparcar.org>
This commit is contained in:
Paul Spooren 2026-07-17 21:19:46 +02:00
parent 52c0274e55
commit 06c826e335
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include/kernel.mk
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@ -102,6 +102,7 @@ KERNEL_MAKE = $(MAKE) $(KERNEL_MAKEOPTS)
KERNEL_MAKE_FLAGS = \
KCFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR))) $(filter-out -fno-plt,$(call qstrip,$(CONFIG_EXTRA_OPTIMIZATION))) $(call qstrip,$(CONFIG_KERNEL_CFLAGS))" \
KAFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR)))" \
HOSTCFLAGS="$(HOST_CFLAGS) -Wall -Wmissing-prototypes -Wstrict-prototypes" \
CROSS_COMPILE="$(KERNEL_CROSS)" \
ARCH="$(LINUX_KARCH)" \