b4c4c1f112
When the mem_size of the segment is bigger than the file_size,
and if this space doesn't overlap another segment, it needs
to be cleared.
This bug is very similar to the one we had for linux-user,
22d113b52f ("linux-user: Fix loading of BSS segments"),
where .bss section is encoded as an extension of the the data
one by setting the segment p_memsz > p_filesz.
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
[PMD: Use recently added address_space_set()]
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220115203725.3834712-3-laurent@vivier.eu>
625 lines
21 KiB
C
625 lines
21 KiB
C
static void glue(bswap_ehdr, SZ)(struct elfhdr *ehdr)
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{
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bswap16s(&ehdr->e_type); /* Object file type */
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bswap16s(&ehdr->e_machine); /* Architecture */
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bswap32s(&ehdr->e_version); /* Object file version */
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bswapSZs(&ehdr->e_entry); /* Entry point virtual address */
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bswapSZs(&ehdr->e_phoff); /* Program header table file offset */
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bswapSZs(&ehdr->e_shoff); /* Section header table file offset */
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bswap32s(&ehdr->e_flags); /* Processor-specific flags */
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bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
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bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
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bswap16s(&ehdr->e_phnum); /* Program header table entry count */
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bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
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bswap16s(&ehdr->e_shnum); /* Section header table entry count */
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bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
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}
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static void glue(bswap_phdr, SZ)(struct elf_phdr *phdr)
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{
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bswap32s(&phdr->p_type); /* Segment type */
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bswapSZs(&phdr->p_offset); /* Segment file offset */
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bswapSZs(&phdr->p_vaddr); /* Segment virtual address */
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bswapSZs(&phdr->p_paddr); /* Segment physical address */
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bswapSZs(&phdr->p_filesz); /* Segment size in file */
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bswapSZs(&phdr->p_memsz); /* Segment size in memory */
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bswap32s(&phdr->p_flags); /* Segment flags */
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bswapSZs(&phdr->p_align); /* Segment alignment */
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}
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static void glue(bswap_shdr, SZ)(struct elf_shdr *shdr)
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{
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bswap32s(&shdr->sh_name);
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bswap32s(&shdr->sh_type);
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bswapSZs(&shdr->sh_flags);
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bswapSZs(&shdr->sh_addr);
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bswapSZs(&shdr->sh_offset);
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bswapSZs(&shdr->sh_size);
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bswap32s(&shdr->sh_link);
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bswap32s(&shdr->sh_info);
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bswapSZs(&shdr->sh_addralign);
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bswapSZs(&shdr->sh_entsize);
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}
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static void glue(bswap_sym, SZ)(struct elf_sym *sym)
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{
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bswap32s(&sym->st_name);
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bswapSZs(&sym->st_value);
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bswapSZs(&sym->st_size);
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bswap16s(&sym->st_shndx);
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}
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static void glue(bswap_rela, SZ)(struct elf_rela *rela)
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{
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bswapSZs(&rela->r_offset);
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bswapSZs(&rela->r_info);
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bswapSZs((elf_word *)&rela->r_addend);
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}
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static struct elf_shdr *glue(find_section, SZ)(struct elf_shdr *shdr_table,
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int n, int type)
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{
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int i;
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for(i=0;i<n;i++) {
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if (shdr_table[i].sh_type == type)
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return shdr_table + i;
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}
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return NULL;
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}
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static int glue(symfind, SZ)(const void *s0, const void *s1)
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{
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hwaddr addr = *(hwaddr *)s0;
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struct elf_sym *sym = (struct elf_sym *)s1;
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int result = 0;
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if (addr < sym->st_value) {
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result = -1;
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} else if (addr >= sym->st_value + sym->st_size) {
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result = 1;
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}
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return result;
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}
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static const char *glue(lookup_symbol, SZ)(struct syminfo *s,
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hwaddr orig_addr)
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{
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struct elf_sym *syms = glue(s->disas_symtab.elf, SZ);
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struct elf_sym *sym;
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sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms),
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glue(symfind, SZ));
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if (sym != NULL) {
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return s->disas_strtab + sym->st_name;
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}
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return "";
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}
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static int glue(symcmp, SZ)(const void *s0, const void *s1)
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{
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struct elf_sym *sym0 = (struct elf_sym *)s0;
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struct elf_sym *sym1 = (struct elf_sym *)s1;
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return (sym0->st_value < sym1->st_value)
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? -1
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: ((sym0->st_value > sym1->st_value) ? 1 : 0);
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}
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static void glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab,
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int clear_lsb, symbol_fn_t sym_cb)
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{
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struct elf_shdr *symtab, *strtab;
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g_autofree struct elf_shdr *shdr_table = NULL;
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g_autofree struct elf_sym *syms = NULL;
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g_autofree char *str = NULL;
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struct syminfo *s;
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int nsyms, i;
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shdr_table = load_at(fd, ehdr->e_shoff,
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sizeof(struct elf_shdr) * ehdr->e_shnum);
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if (!shdr_table) {
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return ;
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}
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if (must_swab) {
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for (i = 0; i < ehdr->e_shnum; i++) {
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glue(bswap_shdr, SZ)(shdr_table + i);
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}
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}
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symtab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_SYMTAB);
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if (!symtab) {
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return;
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}
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syms = load_at(fd, symtab->sh_offset, symtab->sh_size);
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if (!syms) {
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return;
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}
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nsyms = symtab->sh_size / sizeof(struct elf_sym);
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/* String table */
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if (symtab->sh_link >= ehdr->e_shnum) {
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return;
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}
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strtab = &shdr_table[symtab->sh_link];
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str = load_at(fd, strtab->sh_offset, strtab->sh_size);
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if (!str) {
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return;
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}
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i = 0;
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while (i < nsyms) {
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if (must_swab) {
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glue(bswap_sym, SZ)(&syms[i]);
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}
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if (sym_cb) {
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sym_cb(str + syms[i].st_name, syms[i].st_info,
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syms[i].st_value, syms[i].st_size);
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}
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/* We are only interested in function symbols.
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Throw everything else away. */
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if (syms[i].st_shndx == SHN_UNDEF ||
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syms[i].st_shndx >= SHN_LORESERVE ||
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ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
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nsyms--;
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if (i < nsyms) {
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syms[i] = syms[nsyms];
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}
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continue;
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}
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if (clear_lsb) {
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/* The bottom address bit marks a Thumb or MIPS16 symbol. */
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syms[i].st_value &= ~(glue(glue(Elf, SZ), _Addr))1;
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}
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i++;
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}
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/* check we have symbols left */
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if (nsyms == 0) {
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return;
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}
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syms = g_realloc(syms, nsyms * sizeof(*syms));
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qsort(syms, nsyms, sizeof(*syms), glue(symcmp, SZ));
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for (i = 0; i < nsyms - 1; i++) {
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if (syms[i].st_size == 0) {
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syms[i].st_size = syms[i + 1].st_value - syms[i].st_value;
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}
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}
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/* Commit */
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s = g_malloc0(sizeof(*s));
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s->lookup_symbol = glue(lookup_symbol, SZ);
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glue(s->disas_symtab.elf, SZ) = g_steal_pointer(&syms);
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s->disas_num_syms = nsyms;
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s->disas_strtab = g_steal_pointer(&str);
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s->next = syminfos;
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syminfos = s;
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}
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static int glue(elf_reloc, SZ)(struct elfhdr *ehdr, int fd, int must_swab,
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uint64_t (*translate_fn)(void *, uint64_t),
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void *translate_opaque, uint8_t *data,
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struct elf_phdr *ph, int elf_machine)
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{
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struct elf_shdr *reltab, *shdr_table = NULL;
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struct elf_rela *rels = NULL;
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int nrels, i, ret = -1;
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elf_word wordval;
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void *addr;
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shdr_table = load_at(fd, ehdr->e_shoff,
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sizeof(struct elf_shdr) * ehdr->e_shnum);
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if (!shdr_table) {
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return -1;
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}
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if (must_swab) {
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for (i = 0; i < ehdr->e_shnum; i++) {
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glue(bswap_shdr, SZ)(&shdr_table[i]);
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}
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}
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reltab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_RELA);
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if (!reltab) {
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goto fail;
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}
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rels = load_at(fd, reltab->sh_offset, reltab->sh_size);
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if (!rels) {
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goto fail;
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}
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nrels = reltab->sh_size / sizeof(struct elf_rela);
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for (i = 0; i < nrels; i++) {
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if (must_swab) {
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glue(bswap_rela, SZ)(&rels[i]);
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}
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if (rels[i].r_offset < ph->p_vaddr ||
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rels[i].r_offset >= ph->p_vaddr + ph->p_filesz) {
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continue;
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}
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addr = &data[rels[i].r_offset - ph->p_vaddr];
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switch (elf_machine) {
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case EM_S390:
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switch (rels[i].r_info) {
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case R_390_RELATIVE:
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wordval = *(elf_word *)addr;
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if (must_swab) {
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bswapSZs(&wordval);
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}
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wordval = translate_fn(translate_opaque, wordval);
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if (must_swab) {
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bswapSZs(&wordval);
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}
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*(elf_word *)addr = wordval;
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break;
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default:
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fprintf(stderr, "Unsupported relocation type %i!\n",
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(int)rels[i].r_info);
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}
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}
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}
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ret = 0;
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fail:
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g_free(rels);
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g_free(shdr_table);
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return ret;
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}
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/*
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* Given 'nhdr', a pointer to a range of ELF Notes, search through them
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* for a note matching type 'elf_note_type' and return a pointer to
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* the matching ELF note.
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*/
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static struct elf_note *glue(get_elf_note_type, SZ)(struct elf_note *nhdr,
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elf_word note_size,
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elf_word phdr_align,
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elf_word elf_note_type)
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{
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elf_word nhdr_size = sizeof(struct elf_note);
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elf_word elf_note_entry_offset = 0;
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elf_word note_type;
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elf_word nhdr_namesz;
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elf_word nhdr_descsz;
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if (nhdr == NULL) {
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return NULL;
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}
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note_type = nhdr->n_type;
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while (note_type != elf_note_type) {
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nhdr_namesz = nhdr->n_namesz;
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nhdr_descsz = nhdr->n_descsz;
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elf_note_entry_offset = nhdr_size +
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QEMU_ALIGN_UP(nhdr_namesz, phdr_align) +
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QEMU_ALIGN_UP(nhdr_descsz, phdr_align);
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/*
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* If the offset calculated in this iteration exceeds the
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* supplied size, we are done and no matching note was found.
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*/
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if (elf_note_entry_offset > note_size) {
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return NULL;
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}
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/* skip to the next ELF Note entry */
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nhdr = (void *)nhdr + elf_note_entry_offset;
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note_type = nhdr->n_type;
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}
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return nhdr;
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}
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static ssize_t glue(load_elf, SZ)(const char *name, int fd,
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uint64_t (*elf_note_fn)(void *, void *, bool),
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uint64_t (*translate_fn)(void *, uint64_t),
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void *translate_opaque,
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int must_swab, uint64_t *pentry,
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uint64_t *lowaddr, uint64_t *highaddr,
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uint32_t *pflags, int elf_machine,
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int clear_lsb, int data_swab,
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AddressSpace *as, bool load_rom,
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symbol_fn_t sym_cb)
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{
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struct elfhdr ehdr;
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struct elf_phdr *phdr = NULL, *ph;
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int size, i;
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ssize_t total_size;
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elf_word mem_size, file_size, data_offset;
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uint64_t addr, low = (uint64_t)-1, high = 0;
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GMappedFile *mapped_file = NULL;
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uint8_t *data = NULL;
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ssize_t ret = ELF_LOAD_FAILED;
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if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
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goto fail;
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if (must_swab) {
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glue(bswap_ehdr, SZ)(&ehdr);
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}
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if (elf_machine <= EM_NONE) {
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/* The caller didn't specify an ARCH, we can figure it out */
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elf_machine = ehdr.e_machine;
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}
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switch (elf_machine) {
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case EM_PPC64:
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if (ehdr.e_machine != EM_PPC64) {
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if (ehdr.e_machine != EM_PPC) {
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ret = ELF_LOAD_WRONG_ARCH;
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goto fail;
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}
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}
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break;
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case EM_X86_64:
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if (ehdr.e_machine != EM_X86_64) {
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if (ehdr.e_machine != EM_386) {
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ret = ELF_LOAD_WRONG_ARCH;
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goto fail;
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}
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}
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break;
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case EM_MICROBLAZE:
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if (ehdr.e_machine != EM_MICROBLAZE) {
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if (ehdr.e_machine != EM_MICROBLAZE_OLD) {
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ret = ELF_LOAD_WRONG_ARCH;
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goto fail;
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}
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}
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break;
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case EM_MIPS:
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case EM_NANOMIPS:
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if ((ehdr.e_machine != EM_MIPS) &&
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(ehdr.e_machine != EM_NANOMIPS)) {
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ret = ELF_LOAD_WRONG_ARCH;
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goto fail;
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}
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break;
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default:
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if (elf_machine != ehdr.e_machine) {
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ret = ELF_LOAD_WRONG_ARCH;
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goto fail;
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}
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}
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if (pflags) {
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*pflags = (elf_word)ehdr.e_flags;
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}
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if (pentry)
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*pentry = (uint64_t)(elf_sword)ehdr.e_entry;
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glue(load_symbols, SZ)(&ehdr, fd, must_swab, clear_lsb, sym_cb);
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size = ehdr.e_phnum * sizeof(phdr[0]);
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if (lseek(fd, ehdr.e_phoff, SEEK_SET) != ehdr.e_phoff) {
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goto fail;
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}
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phdr = g_malloc0(size);
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if (!phdr)
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goto fail;
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if (read(fd, phdr, size) != size)
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goto fail;
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if (must_swab) {
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for(i = 0; i < ehdr.e_phnum; i++) {
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ph = &phdr[i];
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glue(bswap_phdr, SZ)(ph);
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}
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}
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/*
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* Since we want to be able to modify the mapped buffer, we set the
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* 'writable' parameter to 'true'. Modifications to the buffer are not
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* written back to the file.
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*/
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mapped_file = g_mapped_file_new_from_fd(fd, true, NULL);
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if (!mapped_file) {
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goto fail;
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}
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total_size = 0;
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for(i = 0; i < ehdr.e_phnum; i++) {
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ph = &phdr[i];
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if (ph->p_type == PT_LOAD) {
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mem_size = ph->p_memsz; /* Size of the ROM */
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file_size = ph->p_filesz; /* Size of the allocated data */
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data_offset = ph->p_offset; /* Offset where the data is located */
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if (file_size > 0) {
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if (g_mapped_file_get_length(mapped_file) <
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file_size + data_offset) {
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goto fail;
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}
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data = (uint8_t *)g_mapped_file_get_contents(mapped_file);
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data += data_offset;
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}
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/* The ELF spec is somewhat vague about the purpose of the
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* physical address field. One common use in the embedded world
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* is that physical address field specifies the load address
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* and the virtual address field specifies the execution address.
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* Segments are packed into ROM or flash, and the relocation
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* and zero-initialization of data is done at runtime. This
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* means that the memsz header represents the runtime size of the
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* segment, but the filesz represents the loadtime size. If
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* we try to honour the memsz value for an ELF file like this
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* we will end up with overlapping segments (which the
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* loader.c code will later reject).
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* We support ELF files using this scheme by by checking whether
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* paddr + memsz for this segment would overlap with any other
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* segment. If so, then we assume it's using this scheme and
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* truncate the loaded segment to the filesz size.
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* If the segment considered as being memsz size doesn't overlap
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* then we use memsz for the segment length, to handle ELF files
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* which assume that the loader will do the zero-initialization.
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*/
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if (mem_size > file_size) {
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/* If this segment's zero-init portion overlaps another
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* segment's data or zero-init portion, then truncate this one.
|
|
* Invalid ELF files where the segments overlap even when
|
|
* only file_size bytes are loaded will be rejected by
|
|
* the ROM overlap check in loader.c, so we don't try to
|
|
* explicitly detect those here.
|
|
*/
|
|
int j;
|
|
elf_word zero_start = ph->p_paddr + file_size;
|
|
elf_word zero_end = ph->p_paddr + mem_size;
|
|
|
|
for (j = 0; j < ehdr.e_phnum; j++) {
|
|
struct elf_phdr *jph = &phdr[j];
|
|
|
|
if (i != j && jph->p_type == PT_LOAD) {
|
|
elf_word other_start = jph->p_paddr;
|
|
elf_word other_end = jph->p_paddr + jph->p_memsz;
|
|
|
|
if (!(other_start >= zero_end ||
|
|
zero_start >= other_end)) {
|
|
mem_size = file_size;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (mem_size > SSIZE_MAX - total_size) {
|
|
ret = ELF_LOAD_TOO_BIG;
|
|
goto fail;
|
|
}
|
|
|
|
/* address_offset is hack for kernel images that are
|
|
linked at the wrong physical address. */
|
|
if (translate_fn) {
|
|
addr = translate_fn(translate_opaque, ph->p_paddr);
|
|
glue(elf_reloc, SZ)(&ehdr, fd, must_swab, translate_fn,
|
|
translate_opaque, data, ph, elf_machine);
|
|
} else {
|
|
addr = ph->p_paddr;
|
|
}
|
|
|
|
if (data_swab) {
|
|
int j;
|
|
for (j = 0; j < file_size; j += (1 << data_swab)) {
|
|
uint8_t *dp = data + j;
|
|
switch (data_swab) {
|
|
case (1):
|
|
*(uint16_t *)dp = bswap16(*(uint16_t *)dp);
|
|
break;
|
|
case (2):
|
|
*(uint32_t *)dp = bswap32(*(uint32_t *)dp);
|
|
break;
|
|
case (3):
|
|
*(uint64_t *)dp = bswap64(*(uint64_t *)dp);
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
}
|
|
|
|
/* the entry pointer in the ELF header is a virtual
|
|
* address, if the text segments paddr and vaddr differ
|
|
* we need to adjust the entry */
|
|
if (pentry && !translate_fn &&
|
|
ph->p_vaddr != ph->p_paddr &&
|
|
ehdr.e_entry >= ph->p_vaddr &&
|
|
ehdr.e_entry < ph->p_vaddr + ph->p_filesz &&
|
|
ph->p_flags & PF_X) {
|
|
*pentry = ehdr.e_entry - ph->p_vaddr + ph->p_paddr;
|
|
}
|
|
|
|
/* Some ELF files really do have segments of zero size;
|
|
* just ignore them rather than trying to create empty
|
|
* ROM blobs, because the zero-length blob can falsely
|
|
* trigger the overlapping-ROM-blobs check.
|
|
*/
|
|
if (mem_size != 0) {
|
|
if (load_rom) {
|
|
g_autofree char *label =
|
|
g_strdup_printf("%s ELF program header segment %d",
|
|
name, i);
|
|
|
|
/*
|
|
* rom_add_elf_program() takes its own reference to
|
|
* 'mapped_file'.
|
|
*/
|
|
rom_add_elf_program(label, mapped_file, data, file_size,
|
|
mem_size, addr, as);
|
|
} else {
|
|
MemTxResult res;
|
|
|
|
res = address_space_write(as ? as : &address_space_memory,
|
|
addr, MEMTXATTRS_UNSPECIFIED,
|
|
data, file_size);
|
|
if (res != MEMTX_OK) {
|
|
goto fail;
|
|
}
|
|
/*
|
|
* We need to zero'ify the space that is not copied
|
|
* from file
|
|
*/
|
|
if (file_size < mem_size) {
|
|
res = address_space_set(as ? as : &address_space_memory,
|
|
addr + file_size, 0,
|
|
mem_size - file_size,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
if (res != MEMTX_OK) {
|
|
goto fail;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
total_size += mem_size;
|
|
if (addr < low)
|
|
low = addr;
|
|
if ((addr + mem_size) > high)
|
|
high = addr + mem_size;
|
|
|
|
data = NULL;
|
|
|
|
} else if (ph->p_type == PT_NOTE && elf_note_fn) {
|
|
struct elf_note *nhdr = NULL;
|
|
|
|
file_size = ph->p_filesz; /* Size of the range of ELF notes */
|
|
data_offset = ph->p_offset; /* Offset where the notes are located */
|
|
|
|
if (file_size > 0) {
|
|
if (g_mapped_file_get_length(mapped_file) <
|
|
file_size + data_offset) {
|
|
goto fail;
|
|
}
|
|
|
|
data = (uint8_t *)g_mapped_file_get_contents(mapped_file);
|
|
data += data_offset;
|
|
}
|
|
|
|
/*
|
|
* Search the ELF notes to find one with a type matching the
|
|
* value passed in via 'translate_opaque'
|
|
*/
|
|
nhdr = (struct elf_note *)data;
|
|
assert(translate_opaque != NULL);
|
|
nhdr = glue(get_elf_note_type, SZ)(nhdr, file_size, ph->p_align,
|
|
*(uint64_t *)translate_opaque);
|
|
if (nhdr != NULL) {
|
|
elf_note_fn((void *)nhdr, (void *)&ph->p_align, SZ == 64);
|
|
}
|
|
data = NULL;
|
|
}
|
|
}
|
|
|
|
if (lowaddr)
|
|
*lowaddr = (uint64_t)(elf_sword)low;
|
|
if (highaddr)
|
|
*highaddr = (uint64_t)(elf_sword)high;
|
|
ret = total_size;
|
|
fail:
|
|
if (mapped_file) {
|
|
g_mapped_file_unref(mapped_file);
|
|
}
|
|
g_free(phdr);
|
|
return ret;
|
|
}
|