7ce7e984ab
GZIP-compressed files end with 4 byte data that represents the size
of the original input. The decompressors (the self-extracting kernel)
exploit it to know the vmlinux size beforehand. To mimic the GZIP's
trailer, Kbuild provides cmd_{bzip2,lzma,lzo,lz4,xzkern,zstd22}.
Unfortunately these macros are used everywhere despite the appended
size data is only useful for the decompressors.
There is no guarantee that such hand-crafted trailers are safely ignored.
In fact, the kernel refuses compressed initramdfs with the garbage data.
That is why usr/Makefile overrides size_append to make it no-op.
To limit the use of such broken compressed files, this commit renames
the existing macros as follows:
cmd_bzip2 --> cmd_bzip2_with_size
cmd_lzma --> cmd_lzma_with_size
cmd_lzo --> cmd_lzo_with_size
cmd_lz4 --> cmd_lz4_with_size
cmd_xzkern --> cmd_xzkern_with_size
cmd_zstd22 --> cmd_zstd22_with_size
To keep the decompressors working, I updated the following Makefiles
accordingly:
arch/arm/boot/compressed/Makefile
arch/h8300/boot/compressed/Makefile
arch/mips/boot/compressed/Makefile
arch/parisc/boot/compressed/Makefile
arch/s390/boot/compressed/Makefile
arch/sh/boot/compressed/Makefile
arch/x86/boot/compressed/Makefile
I reused the current macro names for the normal usecases; they produce
the compressed data in the proper format.
I did not touch the following:
arch/arc/boot/Makefile
arch/arm64/boot/Makefile
arch/csky/boot/Makefile
arch/mips/boot/Makefile
arch/riscv/boot/Makefile
arch/sh/boot/Makefile
kernel/Makefile
This means those Makefiles will stop appending the size data.
I dropped the 'override size_append' hack from usr/Makefile.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <n.schier@avm.de>
45 lines
1.4 KiB
Makefile
45 lines
1.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# linux/arch/sh/boot/compressed/Makefile
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#
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# create a compressed vmlinux image from the original vmlinux
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#
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targets := vmlinux vmlinux.bin vmlinux.bin.gz head.o misc.o piggy.o
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OBJECTS = $(obj)/head.o $(obj)/misc.o
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#
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# IMAGE_OFFSET is the load offset of the compression loader
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# Assign dummy values if these 2 variables are not defined,
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# in order to suppress error message.
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#
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CONFIG_MEMORY_START ?= 0x00400000
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CONFIG_BOOT_LINK_OFFSET ?= 0x00280000
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IMAGE_OFFSET := $(shell printf "0x%08x" $$(($(CONFIG_MEMORY_START)+$(CONFIG_BOOT_LINK_OFFSET))))
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LIBGCC := $(shell $(CROSS-COMPILE)$(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name 2>/dev/null)
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LDFLAGS_vmlinux := -Ttext $(IMAGE_OFFSET) -estartup -T $(obj)/vmlinux.lds \
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--defsym output=$(CONFIG_MEMORY_START)
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$(obj)/vmlinux: $(OBJECTS) $(obj)/piggy.o $(LIBGCC) FORCE
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$(call if_changed,ld)
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$(obj)/vmlinux.bin: vmlinux FORCE
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$(call if_changed,objcopy)
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suffix-$(CONFIG_KERNEL_GZIP) := gzip
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suffix-$(CONFIG_KERNEL_LZO) := lzo
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compress-$(CONFIG_KERNEL_GZIP) := gzip
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compress-$(CONFIG_KERNEL_LZO) := lzo_with_size
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$(obj)/vmlinux.bin.$(suffix-y): $(obj)/vmlinux.bin FORCE
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$(call if_changed,$(compress-y))
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LDFLAGS_piggy.o := -r --format binary --oformat elf32-h8300-linux -T
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OBJCOPYFLAGS := -O binary
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$(obj)/piggy.o: $(obj)/vmlinux.scr $(obj)/vmlinux.bin.$(suffix-y) FORCE
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$(call if_changed,ld)
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CFLAGS_misc.o = -O0
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