static char *readsonameXX(char *name, FILE *infile, int expected_type, int *type) { ElfW(Ehdr) *epnt; ElfW(Phdr) *ppnt; unsigned int i, j; char *header; ElfW(Addr) dynamic_addr = 0; ElfW(Addr) dynamic_size = 0; unsigned long page_size = getpagesize(); ElfW(Addr) strtab_val = 0; ElfW(Addr) needed_val; ElfW(Addr) loadaddr = -1; ElfW(Dyn) *dpnt; struct stat st; char *needed; char *soname = NULL; int multi_libcs = 0; if (expected_type == LIB_DLL) { warn("%s does not match type specified for directory!", name); expected_type = LIB_ANY; } *type = LIB_ELF; if (fstat(fileno(infile), &st)) return NULL; header = mmap(0, st.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fileno(infile), 0); if (header == (caddr_t) - 1) return NULL; epnt = (ElfW(Ehdr) *) header; if ((char *)(epnt + 1) > (char *)(header + st.st_size)) goto skip; if (UCLIBC_ENDIAN_HOST == UCLIBC_ENDIAN_LITTLE) byteswap = (epnt->e_ident[5] == ELFDATA2MSB) ? 1 : 0; else if (UCLIBC_ENDIAN_HOST == UCLIBC_ENDIAN_BIG) byteswap = (epnt->e_ident[5] == ELFDATA2LSB) ? 1 : 0; /* Be very lazy, and only byteswap the stuff we use */ if (byteswap == 1) { epnt->e_phoff = bswap_32(epnt->e_phoff); epnt->e_phnum = bswap_16(epnt->e_phnum); } ppnt = (ElfW(Phdr) *) & header[epnt->e_phoff]; if ((char *)ppnt < (char *)header || (char *)(ppnt + epnt->e_phnum) > (char *)(header + st.st_size)) goto skip; for (i = 0; i < epnt->e_phnum; i++) { /* Be very lazy, and only byteswap the stuff we use */ if (byteswap == 1) { ppnt->p_type = bswap_32(ppnt->p_type); ppnt->p_vaddr = bswap_32(ppnt->p_vaddr); ppnt->p_offset = bswap_32(ppnt->p_offset); ppnt->p_filesz = bswap_32(ppnt->p_filesz); } if (loadaddr == (ElfW(Addr)) - 1 && ppnt->p_type == PT_LOAD) loadaddr = (ppnt->p_vaddr & ~(page_size - 1)) - (ppnt->p_offset & ~(page_size - 1)); if (ppnt->p_type == 2) { dynamic_addr = ppnt->p_offset; dynamic_size = ppnt->p_filesz; }; ppnt++; }; dpnt = (ElfW(Dyn) *) & header[dynamic_addr]; dynamic_size = dynamic_size / sizeof(ElfW(Dyn)); if ((char *)dpnt < (char *)header || (char *)(dpnt + dynamic_size) > (char *)(header + st.st_size)) goto skip; if (byteswap == 1) { dpnt->d_tag = bswap_32(dpnt->d_tag); dpnt->d_un.d_val = bswap_32(dpnt->d_un.d_val); } while (dpnt->d_tag != DT_NULL) { if (dpnt->d_tag == DT_STRTAB) strtab_val = dpnt->d_un.d_val; dpnt++; if (byteswap == 1) { dpnt->d_tag = bswap_32(dpnt->d_tag); dpnt->d_un.d_val = bswap_32(dpnt->d_un.d_val); } }; if (!strtab_val) goto skip; dpnt = (ElfW(Dyn) *) & header[dynamic_addr]; while (dpnt->d_tag != DT_NULL) { if (dpnt->d_tag == DT_SONAME || dpnt->d_tag == DT_NEEDED) { needed_val = dpnt->d_un.d_val; if (needed_val + strtab_val >= loadaddr || needed_val + strtab_val < st.st_size - loadaddr) { needed = (char *)(header - loadaddr + strtab_val + needed_val); if (dpnt->d_tag == DT_SONAME) soname = xstrdup(needed); for (j = 0; needed_tab[j].soname != NULL; j++) { if (strcmp(needed, needed_tab[j].soname) == 0) { if (*type != LIB_ELF && *type != needed_tab[j].type) multi_libcs = 1; *type = needed_tab[j].type; } } } } dpnt++; }; if (multi_libcs) warn("%s appears to be for multiple libc's", name); /* If we could not deduce the libc type, and we know what to expect, set the type */ if (*type == LIB_ELF && expected_type != LIB_ANY) *type = expected_type; if (expected_type != LIB_ANY && expected_type != LIB_ELF && expected_type != *type) { warn("%s does not match type specified for directory!", name); } skip: munmap(header, st.st_size); return soname; }