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https://github.com/sheumann/hush.git
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insmod: mix xmalloc with xrealloc_vector more carefully
This commit is contained in:
Denis Vlasenko
parent
1ebdaccd6d
commit
3b80cac953
@ -1059,8 +1059,9 @@ arch_apply_relocation(struct obj_file *f,
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case R_68K_PC8:
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v -= dot;
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if ((ElfW(Sword))v > 0x7f ||
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(ElfW(Sword))v < -(ElfW(Sword))0x80) {
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if ((ElfW(Sword))v > 0x7f
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|| (ElfW(Sword))v < -(ElfW(Sword))0x80
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) {
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ret = obj_reloc_overflow;
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}
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*(char *)loc = v;
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@ -1068,8 +1069,9 @@ arch_apply_relocation(struct obj_file *f,
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case R_68K_PC16:
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v -= dot;
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if ((ElfW(Sword))v > 0x7fff ||
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(ElfW(Sword))v < -(ElfW(Sword))0x8000) {
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if ((ElfW(Sword))v > 0x7fff
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|| (ElfW(Sword))v < -(ElfW(Sword))0x8000
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) {
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ret = obj_reloc_overflow;
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}
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*(short *)loc = v;
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@ -1208,8 +1210,9 @@ arch_apply_relocation(struct obj_file *f,
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{
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Elf32_Addr word;
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if ((Elf32_Sword)v > 0x7fff ||
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(Elf32_Sword)v < -(Elf32_Sword)0x8000) {
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if ((Elf32_Sword)v > 0x7fff
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|| (Elf32_Sword)v < -(Elf32_Sword)0x8000
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) {
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ret = obj_reloc_overflow;
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}
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@ -1238,8 +1241,9 @@ arch_apply_relocation(struct obj_file *f,
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Elf32_Addr word;
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v -= dot + 4;
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if ((Elf32_Sword)v > 0x7fff ||
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(Elf32_Sword)v < -(Elf32_Sword)0x8000) {
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if ((Elf32_Sword)v > 0x7fff
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|| (Elf32_Sword)v < -(Elf32_Sword)0x8000
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) {
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ret = obj_reloc_overflow;
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}
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@ -1253,9 +1257,10 @@ arch_apply_relocation(struct obj_file *f,
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Elf32_Addr word, gp;
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/* get _gp */
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gp = obj_symbol_final_value(f, obj_find_symbol(f, SPFX "_gp"));
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v-=gp;
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if ((Elf32_Sword)v > 0x7fff ||
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(Elf32_Sword)v < -(Elf32_Sword)0x8000) {
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v -= gp;
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if ((Elf32_Sword)v > 0x7fff
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|| (Elf32_Sword)v < -(Elf32_Sword)0x8000
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) {
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ret = obj_reloc_overflow;
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}
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@ -2132,7 +2137,6 @@ obj_find_symbol(struct obj_file *f, const char *name)
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for (sym = f->symtab[hash]; sym; sym = sym->next)
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if (f->symbol_cmp(sym->name, name) == 0)
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return sym;
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return NULL;
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}
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@ -2141,12 +2145,10 @@ static ElfW(Addr) obj_symbol_final_value(struct obj_file * f, struct obj_symbol
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if (sym) {
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if (sym->secidx >= SHN_LORESERVE)
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return sym->value;
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return sym->value + f->sections[sym->secidx]->header.sh_addr;
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} else {
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/* As a special case, a NULL sym has value zero. */
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return 0;
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}
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/* As a special case, a NULL sym has value zero. */
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return 0;
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}
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static struct obj_section *obj_find_section(struct obj_file *f, const char *name)
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@ -2156,7 +2158,6 @@ static struct obj_section *obj_find_section(struct obj_file *f, const char *name
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for (i = 0; i < n; ++i)
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if (strcmp(f->sections[i]->name, name) == 0)
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return f->sections[i];
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return NULL;
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}
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@ -2167,9 +2168,11 @@ static int obj_load_order_prio(struct obj_section *a)
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af = a->header.sh_flags;
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ac = 0;
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if (a->name[0] != '.' || strlen(a->name) != 10 ||
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strcmp(a->name + 5, ".init"))
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if (a->name[0] != '.' || strlen(a->name) != 10
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|| strcmp(a->name + 5, ".init") != 0
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) {
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ac |= 32;
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}
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if (af & SHF_ALLOC)
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ac |= 16;
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if (!(af & SHF_WRITE))
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@ -2856,18 +2859,19 @@ static int new_create_module_ksymtab(struct obj_file *f)
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/* We don't want to export symbols residing in sections that
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aren't loaded. There are a number of these created so that
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we make sure certain module options don't appear twice. */
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loaded = alloca(sizeof(int) * (i = f->header.e_shnum));
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i = f->header.e_shnum;
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loaded = alloca(sizeof(int) * i);
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while (--i >= 0)
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loaded[i] = (f->sections[i]->header.sh_flags & SHF_ALLOC) != 0;
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for (nsyms = i = 0; i < HASH_BUCKETS; ++i) {
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struct obj_symbol *sym;
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for (sym = f->symtab[i]; sym; sym = sym->next)
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for (sym = f->symtab[i]; sym; sym = sym->next) {
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if (ELF_ST_BIND(sym->info) != STB_LOCAL
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&& sym->secidx <= SHN_HIRESERVE
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&& (sym->secidx >= SHN_LORESERVE
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|| loaded[sym->secidx])) {
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|| loaded[sym->secidx])
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) {
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ElfW(Addr) ofs = nsyms * 2 * tgt_sizeof_void_p;
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obj_symbol_patch(f, sec->idx, ofs, sym);
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@ -2876,6 +2880,7 @@ static int new_create_module_ksymtab(struct obj_file *f)
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nsyms++;
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}
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}
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}
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obj_extend_section(sec, nsyms * 2 * tgt_sizeof_char_p);
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@ -2934,9 +2939,11 @@ new_init_module(const char *m_name, struct obj_file *f, unsigned long m_size)
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}
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sec = obj_find_section(f, ".data.init");
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if (sec) {
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if (!module->runsize ||
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module->runsize > sec->header.sh_addr - m_addr)
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if (!module->runsize
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|| module->runsize > sec->header.sh_addr - m_addr
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) {
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module->runsize = sec->header.sh_addr - m_addr;
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}
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}
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sec = obj_find_section(f, ARCHDATA_SEC_NAME);
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if (sec && sec->header.sh_size) {
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@ -3219,8 +3226,8 @@ static int obj_relocate(struct obj_file *f, ElfW(Addr) base)
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#if SHT_RELM == SHT_RELA
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#if defined(__alpha__) && defined(AXP_BROKEN_GAS)
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/* Work around a nasty GAS bug, that is fixed as of 2.7.0.9. */
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if (!extsym || !extsym->st_name ||
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ELF_ST_BIND(extsym->st_info) != STB_LOCAL)
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if (!extsym || !extsym->st_name
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|| ELF_ST_BIND(extsym->st_info) != STB_LOCAL)
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#endif
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value += rel->r_addend;
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#endif
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@ -3326,16 +3333,17 @@ static struct obj_file *obj_load(FILE *fp, int loadprogbits UNUSED_PARAM)
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}
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if (f->header.e_ident[EI_MAG0] != ELFMAG0
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|| f->header.e_ident[EI_MAG1] != ELFMAG1
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|| f->header.e_ident[EI_MAG2] != ELFMAG2
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|| f->header.e_ident[EI_MAG3] != ELFMAG3) {
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|| f->header.e_ident[EI_MAG1] != ELFMAG1
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|| f->header.e_ident[EI_MAG2] != ELFMAG2
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|| f->header.e_ident[EI_MAG3] != ELFMAG3
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) {
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bb_error_msg_and_die("not an ELF file");
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}
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if (f->header.e_ident[EI_CLASS] != ELFCLASSM
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|| f->header.e_ident[EI_DATA] != (BB_BIG_ENDIAN
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? ELFDATA2MSB : ELFDATA2LSB)
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|| f->header.e_ident[EI_VERSION] != EV_CURRENT
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|| !MATCH_MACHINE(f->header.e_machine)) {
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|| f->header.e_ident[EI_DATA] != (BB_BIG_ENDIAN ? ELFDATA2MSB : ELFDATA2LSB)
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|| f->header.e_ident[EI_VERSION] != EV_CURRENT
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|| !MATCH_MACHINE(f->header.e_machine)
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) {
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bb_error_msg_and_die("ELF file not for this architecture");
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}
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if (f->header.e_type != ET_REL) {
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@ -3351,7 +3359,10 @@ static struct obj_file *obj_load(FILE *fp, int loadprogbits UNUSED_PARAM)
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}
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shnum = f->header.e_shnum;
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f->sections = xzalloc(sizeof(struct obj_section *) * shnum);
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/* Growth of ->sections vector will be done by
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* xrealloc_vector(..., 2, ...), therefore we must allocate
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* at least 2^2 = 4 extra elements here. */
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f->sections = xzalloc(sizeof(f->sections[0]) * (shnum + 4));
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section_headers = alloca(sizeof(ElfW(Shdr)) * shnum);
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fseek(fp, f->header.e_shoff, SEEK_SET);
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@ -3855,16 +3866,20 @@ static void print_load_map(struct obj_file *f)
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for (nsyms = i = 0; i < HASH_BUCKETS; ++i)
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for (sym = f->symtab[i]; sym; sym = sym->next)
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if (sym->secidx <= SHN_HIRESERVE
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&& (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx]))
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&& (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx])
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) {
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++nsyms;
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}
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all = alloca(nsyms * sizeof(struct obj_symbol *));
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for (i = 0, p = all; i < HASH_BUCKETS; ++i)
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for (sym = f->symtab[i]; sym; sym = sym->next)
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if (sym->secidx <= SHN_HIRESERVE
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&& (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx]))
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&& (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx])
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) {
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*p++ = sym;
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}
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/* And list them. */
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printf("\nSymbols:\n");
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