kbuild: fix section mismatch check for vmlinux
vmlinux does not contain relocation entries which is used by the section mismatch checks. Reported by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Use the individual objects as inputs to overcome this limitation. In modpost check the .o files and skip non-ELF files. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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1
Makefile
1
Makefile
@ -603,6 +603,7 @@ vmlinux-init := $(head-y) $(init-y)
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vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
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vmlinux-all := $(vmlinux-init) $(vmlinux-main)
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vmlinux-lds := arch/$(ARCH)/kernel/vmlinux.lds
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export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
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# Rule to link vmlinux - also used during CONFIG_KALLSYMS
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# May be overridden by arch/$(ARCH)/Makefile
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@ -63,16 +63,16 @@ quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
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$(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \
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$(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \
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$(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
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$(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) \
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$(wildcard vmlinux) $(filter-out FORCE,$^)
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$(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w)
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PHONY += __modpost
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__modpost: $(modules:.ko=.o) FORCE
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$(call cmd,modpost)
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$(call cmd,modpost) $(wildcard vmlinux) $(filter-out FORCE,$^)
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quiet_cmd_kernel-mod = MODPOST $@
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cmd_kernel-mod = $(cmd_modpost)
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cmd_kernel-mod = $(cmd_modpost) $(KBUILD_VMLINUX_OBJS)
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PHONY += vmlinux
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vmlinux: FORCE
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$(call cmd,kernel-mod)
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@ -333,10 +333,10 @@ void release_file(void *file, unsigned long size)
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munmap(file, size);
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}
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static void parse_elf(struct elf_info *info, const char *filename)
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static int parse_elf(struct elf_info *info, const char *filename)
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{
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unsigned int i;
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Elf_Ehdr *hdr = info->hdr;
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Elf_Ehdr *hdr;
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Elf_Shdr *sechdrs;
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Elf_Sym *sym;
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@ -346,9 +346,18 @@ static void parse_elf(struct elf_info *info, const char *filename)
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exit(1);
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}
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info->hdr = hdr;
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if (info->size < sizeof(*hdr))
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goto truncated;
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if (info->size < sizeof(*hdr)) {
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/* file too small, assume this is an empty .o file */
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return 0;
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}
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/* Is this a valid ELF file? */
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if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
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(hdr->e_ident[EI_MAG1] != ELFMAG1) ||
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(hdr->e_ident[EI_MAG2] != ELFMAG2) ||
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(hdr->e_ident[EI_MAG3] != ELFMAG3)) {
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/* Not an ELF file - silently ignore it */
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return 0;
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}
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/* Fix endianness in ELF header */
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hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
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hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
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@ -371,8 +380,10 @@ static void parse_elf(struct elf_info *info, const char *filename)
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= (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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const char *secname;
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if (sechdrs[i].sh_offset > info->size)
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goto truncated;
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if (sechdrs[i].sh_offset > info->size) {
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fatal("%s is truncated. sechdrs[i].sh_offset=%u > sizeof(*hrd)=%ul\n", filename, (unsigned int)sechdrs[i].sh_offset, sizeof(*hdr));
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return 0;
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}
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secname = secstrings + sechdrs[i].sh_name;
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if (strcmp(secname, ".modinfo") == 0) {
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info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
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@ -407,10 +418,7 @@ static void parse_elf(struct elf_info *info, const char *filename)
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sym->st_value = TO_NATIVE(sym->st_value);
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sym->st_size = TO_NATIVE(sym->st_size);
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}
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return;
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truncated:
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fatal("%s is truncated.\n", filename);
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return 1;
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}
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static void parse_elf_finish(struct elf_info *info)
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@ -1089,7 +1097,8 @@ static void read_symbols(char *modname)
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struct elf_info info = { };
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Elf_Sym *sym;
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parse_elf(&info, modname);
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if (!parse_elf(&info, modname))
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return;
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mod = new_module(modname);
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