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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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032ce1ea94
The GNU coreutils version of truncate, which is the original, accepts a % prefix for the -s size argument which means the file in question should be padded to a multiple of the given size. This is currently used to pad the setup block of bzImage to a multiple of 4k before appending the decompressor. busybox reimplements truncate but does not support this idiom, and therefore fails the build since commit9c54baab44("x86/boot: Drop CRC-32 checksum and the build tool that generates it") Since very little build code within the kernel depends on the 'truncate' utility, work around this incompatibility by avoiding truncate altogether, and relying on dd to perform the padding. Fixes:9c54baab44("x86/boot: Drop CRC-32 checksum and the build tool that generates it") Reported-by: <phasta@kernel.org> Tested-by: Philipp Stanner <phasta@kernel.org> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20250424101917.1552527-2-ardb+git@google.com
140 lines
4.5 KiB
Makefile
140 lines
4.5 KiB
Makefile
#
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# arch/x86/boot/Makefile
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1994 by Linus Torvalds
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# Changed by many, many contributors over the years.
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#
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# If you want to preset the SVGA mode, uncomment the next line and
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# set SVGA_MODE to whatever number you want.
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# Set it to -DSVGA_MODE=NORMAL_VGA if you just want the EGA/VGA mode.
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# The number is the same as you would ordinarily press at bootup.
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SVGA_MODE := -DSVGA_MODE=NORMAL_VGA
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targets := vmlinux.bin setup.bin setup.elf bzImage
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targets += fdimage fdimage144 fdimage288 image.iso hdimage
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subdir- := compressed
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setup-y += a20.o bioscall.o cmdline.o copy.o cpu.o cpuflags.o cpucheck.o
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setup-y += early_serial_console.o edd.o header.o main.o memory.o
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setup-y += pm.o pmjump.o printf.o regs.o string.o tty.o video.o
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setup-y += video-mode.o version.o
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setup-$(CONFIG_X86_APM_BOOT) += apm.o
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# The link order of the video-*.o modules can matter. In particular,
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# video-vga.o *must* be listed first, followed by video-vesa.o.
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# Hardware-specific drivers should follow in the order they should be
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# probed, and video-bios.o should typically be last.
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setup-y += video-vga.o
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setup-y += video-vesa.o
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setup-y += video-bios.o
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targets += $(setup-y)
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hostprogs += mkcpustr
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HOST_EXTRACFLAGS += -I$(srctree)/tools/include \
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-include include/generated/autoconf.h \
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-D__EXPORTED_HEADERS__
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$(obj)/cpu.o: $(obj)/cpustr.h
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quiet_cmd_cpustr = CPUSTR $@
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cmd_cpustr = $(obj)/mkcpustr > $@
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$(obj)/cpustr.h: $(obj)/mkcpustr FORCE
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$(call if_changed,cpustr)
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targets += cpustr.h
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# ---------------------------------------------------------------------------
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KBUILD_CFLAGS := $(REALMODE_CFLAGS) -D_SETUP
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KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
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KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
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KBUILD_CFLAGS += $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
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$(obj)/bzImage: asflags-y := $(SVGA_MODE)
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quiet_cmd_image = BUILD $@
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cmd_image = (dd if=$< bs=4k conv=sync status=none; cat $(filter-out $<,$(real-prereqs))) >$@
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$(obj)/bzImage: $(obj)/setup.bin $(obj)/vmlinux.bin FORCE
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$(call if_changed,image)
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@$(kecho) 'Kernel: $@ is ready' ' (#'$(or $(KBUILD_BUILD_VERSION),`cat .version`)')'
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OBJCOPYFLAGS_vmlinux.bin := -O binary -R .note -R .comment -S
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$(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
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$(call if_changed,objcopy)
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SETUP_OBJS = $(addprefix $(obj)/,$(setup-y))
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sed-zoffset := -e 's/^\([0-9a-fA-F]*\) [a-zA-Z] \(startup_32\|efi.._stub_entry\|efi\(32\)\?_pe_entry\|input_data\|kernel_info\|_end\|_ehead\|_text\|_e\?data\|z_.*\)$$/\#define ZO_\2 0x\1/p'
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quiet_cmd_zoffset = ZOFFSET $@
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cmd_zoffset = $(NM) $< | sed -n $(sed-zoffset) > $@
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targets += zoffset.h
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$(obj)/zoffset.h: $(obj)/compressed/vmlinux FORCE
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$(call if_changed,zoffset)
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AFLAGS_header.o += -I$(objtree)/$(obj)
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$(obj)/header.o: $(obj)/zoffset.h
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LDFLAGS_setup.elf := -m elf_i386 -z noexecstack -T
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$(obj)/setup.elf: $(src)/setup.ld $(SETUP_OBJS) FORCE
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$(call if_changed,ld)
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OBJCOPYFLAGS_setup.bin := -O binary
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$(obj)/setup.bin: $(obj)/setup.elf FORCE
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$(call if_changed,objcopy)
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$(obj)/compressed/vmlinux: FORCE
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$(Q)$(MAKE) $(build)=$(obj)/compressed $@
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# Set this if you want to pass append arguments to the
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# bzdisk/fdimage/hdimage/isoimage kernel
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FDARGS =
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# Set this if you want one or more initrds included in the image
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FDINITRD =
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imgdeps = $(obj)/bzImage $(obj)/mtools.conf $(src)/genimage.sh
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$(obj)/mtools.conf: $(src)/mtools.conf.in
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sed -e 's|@OBJ@|$(obj)|g' < $< > $@
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targets += mtools.conf
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# genimage.sh requires bash, but it also has a bunch of other
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# external dependencies.
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quiet_cmd_genimage = GENIMAGE $3
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cmd_genimage = $(BASH) $(src)/genimage.sh $2 $3 $(obj)/bzImage \
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$(obj)/mtools.conf '$(FDARGS)' $(FDINITRD)
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PHONY += bzdisk fdimage fdimage144 fdimage288 hdimage isoimage
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# This requires write access to /dev/fd0
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# All images require syslinux to be installed; hdimage also requires
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# EDK2/OVMF if the kernel is compiled with the EFI stub.
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bzdisk: $(imgdeps)
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$(call cmd,genimage,bzdisk,/dev/fd0)
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fdimage fdimage144: $(imgdeps)
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$(call cmd,genimage,fdimage144,$(obj)/fdimage)
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@$(kecho) 'Kernel: $(obj)/fdimage is ready'
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fdimage288: $(imgdeps)
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$(call cmd,genimage,fdimage288,$(obj)/fdimage)
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@$(kecho) 'Kernel: $(obj)/fdimage is ready'
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hdimage: $(imgdeps)
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$(call cmd,genimage,hdimage,$(obj)/hdimage)
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@$(kecho) 'Kernel: $(obj)/hdimage is ready'
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isoimage: $(imgdeps)
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$(call cmd,genimage,isoimage,$(obj)/image.iso)
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@$(kecho) 'Kernel: $(obj)/image.iso is ready'
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