linux-master/kernel/kexec_elf.c

24 static inline bool elf_is_elf_file(const struct elfhdr *ehdr)
26 	return memcmp(ehdr->e_ident, ELFMAG, SELFMAG) == 0;
29 static uint64_t elf64_to_cpu(const struct elfhdr *ehdr, uint64_t value)
31 	if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB)
33 	else if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB)
39 static uint32_t elf32_to_cpu(const struct elfhdr *ehdr, uint32_t value)
41 	if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB)
43 	else if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB)
49 static uint16_t elf16_to_cpu(const struct elfhdr *ehdr, uint16_t value)
51 	if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB)
53 	else if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB)
63 static bool elf_is_ehdr_sane(const struct elfhdr *ehdr, size_t buf_len)
65 	if (ehdr->e_phnum > 0 && ehdr->e_phentsize != sizeof(struct elf_phdr)) {
68 	} else if (ehdr->e_shnum > 0 &&
69 		   ehdr->e_shentsize != sizeof(struct elf_shdr)) {
72 	} else if (ehdr->e_ident[EI_VERSION] != EV_CURRENT ||
73 		   ehdr->e_version != EV_CURRENT) {
78 	if (ehdr->e_phoff > 0 && ehdr->e_phnum > 0) {
85 		phdr_size = sizeof(struct elf_phdr) * ehdr->e_phnum;
88 		if (ehdr->e_phoff + phdr_size < ehdr->e_phoff) {
91 		} else if (ehdr->e_phoff + phdr_size > buf_len) {
97 	if (ehdr->e_shoff > 0 && ehdr->e_shnum > 0) {
104 		shdr_size = sizeof(struct elf_shdr) * ehdr->e_shnum;
107 		if (ehdr->e_shoff + shdr_size < ehdr->e_shoff) {
110 		} else if (ehdr->e_shoff + shdr_size > buf_len) {
119 static int elf_read_ehdr(const char *buf, size_t len, struct elfhdr *ehdr)
128 	memset(ehdr, 0, sizeof(*ehdr));
129 	memcpy(ehdr->e_ident, buf, sizeof(ehdr->e_ident));
130 	if (!elf_is_elf_file(ehdr)) {
135 	if (ehdr->e_ident[EI_CLASS] != ELF_CLASS) {
138 	} else  if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB &&
139 		ehdr->e_ident[EI_DATA] != ELFDATA2MSB) {
145 	if (elf16_to_cpu(ehdr, buf_ehdr->e_ehsize) != sizeof(*buf_ehdr)) {
150 	ehdr->e_type      = elf16_to_cpu(ehdr, buf_ehdr->e_type);
151 	ehdr->e_machine   = elf16_to_cpu(ehdr, buf_ehdr->e_machine);
152 	ehdr->e_version   = elf32_to_cpu(ehdr, buf_ehdr->e_version);
153 	ehdr->e_flags     = elf32_to_cpu(ehdr, buf_ehdr->e_flags);
154 	ehdr->e_phentsize = elf16_to_cpu(ehdr, buf_ehdr->e_phentsize);
155 	ehdr->e_phnum     = elf16_to_cpu(ehdr, buf_ehdr->e_phnum);
156 	ehdr->e_shentsize = elf16_to_cpu(ehdr, buf_ehdr->e_shentsize);
157 	ehdr->e_shnum     = elf16_to_cpu(ehdr, buf_ehdr->e_shnum);
158 	ehdr->e_shstrndx  = elf16_to_cpu(ehdr, buf_ehdr->e_shstrndx);
160 	switch (ehdr->e_ident[EI_CLASS]) {
162 		ehdr->e_entry = elf64_to_cpu(ehdr, buf_ehdr->e_entry);
163 		ehdr->e_phoff = elf64_to_cpu(ehdr, buf_ehdr->e_phoff);
164 		ehdr->e_shoff = elf64_to_cpu(ehdr, buf_ehdr->e_shoff);
168 		ehdr->e_entry = elf32_to_cpu(ehdr, buf_ehdr->e_entry);
169 		ehdr->e_phoff = elf32_to_cpu(ehdr, buf_ehdr->e_phoff);
170 		ehdr->e_shoff = elf32_to_cpu(ehdr, buf_ehdr->e_shoff);
178 	return elf_is_ehdr_sane(ehdr, len) ? 0 : -ENOEXEC;
208 	const struct elfhdr *ehdr = elf_info->ehdr;
212 	pbuf = buf + elf_info->ehdr->e_phoff + (idx * sizeof(*buf_phdr));
215 	phdr->p_type   = elf32_to_cpu(elf_info->ehdr, buf_phdr->p_type);
216 	phdr->p_flags  = elf32_to_cpu(elf_info->ehdr, buf_phdr->p_flags);
218 	switch (ehdr->e_ident[EI_CLASS]) {
220 		phdr->p_offset = elf64_to_cpu(ehdr, buf_phdr->p_offset);
221 		phdr->p_paddr  = elf64_to_cpu(ehdr, buf_phdr->p_paddr);
222 		phdr->p_vaddr  = elf64_to_cpu(ehdr, buf_phdr->p_vaddr);
223 		phdr->p_filesz = elf64_to_cpu(ehdr, buf_phdr->p_filesz);
224 		phdr->p_memsz  = elf64_to_cpu(ehdr, buf_phdr->p_memsz);
225 		phdr->p_align  = elf64_to_cpu(ehdr, buf_phdr->p_align);
229 		phdr->p_offset = elf32_to_cpu(ehdr, buf_phdr->p_offset);
230 		phdr->p_paddr  = elf32_to_cpu(ehdr, buf_phdr->p_paddr);
231 		phdr->p_vaddr  = elf32_to_cpu(ehdr, buf_phdr->p_vaddr);
232 		phdr->p_filesz = elf32_to_cpu(ehdr, buf_phdr->p_filesz);
233 		phdr->p_memsz  = elf32_to_cpu(ehdr, buf_phdr->p_memsz);
234 		phdr->p_align  = elf32_to_cpu(ehdr, buf_phdr->p_align);
255 	const struct elfhdr *ehdr = elf_info->ehdr;
261 	phdr_size = sizeof(struct elf_phdr) * ehdr->e_phnum;
267 	for (i = 0; i < ehdr->e_phnum; i++) {
285  * @ehdr:	Pointer to existing struct which will be populated.
297 				struct elfhdr *ehdr,
302 	ret = elf_read_ehdr(buf, len, ehdr);
307 	elf_info->ehdr = ehdr;
308 	if (ehdr->e_phoff > 0 && ehdr->e_phnum > 0) {
327 int kexec_build_elf_info(const char *buf, size_t len, struct elfhdr *ehdr,
333 	ret = elf_read_from_buffer(buf, len, ehdr, elf_info);
338 	if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN) {
346 	for (i = 0; i < ehdr->e_phnum; i++) {
367 	struct elfhdr ehdr;
371 	ret = kexec_build_elf_info(buf, len, &ehdr, &elf_info);
377 	return elf_check_arch(&ehdr) ? 0 : -ENOEXEC;
388 int kexec_elf_load(struct kimage *image, struct elfhdr *ehdr,
398 	for (i = 0; i < ehdr->e_phnum; i++) {