mirror of
https://github.com/openbsd/src.git
synced 2024-12-22 16:42:56 -08:00
Use elf(3) api instead of an ad-hoc elf parser.
Ok mpi@
This commit is contained in:
sunil
parent
24b86205f8
commit
9b214edac7
@ -1,11 +1,11 @@
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PROG= ctfdump
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SRCS= ctfdump.c elf.c
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SRCS= ctfdump.c
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CFLAGS+= -W -Wall -Wstrict-prototypes -Wno-unused -Wunused-variable
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CFLAGS+= -DZLIB
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LDADD+= -lz
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DPADD+= ${LIBZ}
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LDADD+= -lelf -lz
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DPADD+= ${LIBELF} ${LIBZ}
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.include <bsd.prog.mk>
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@ -1,4 +1,4 @@
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/* $OpenBSD: ctfdump.c,v 1.22 2019/03/16 16:35:03 sunil Exp $ */
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/* $OpenBSD: ctfdump.c,v 1.23 2019/05/14 03:16:55 sunil Exp $ */
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/*
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* Copyright (c) 2016 Martin Pieuchot <mpi@openbsd.org>
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@ -21,9 +21,10 @@
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#include <sys/mman.h>
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#include <sys/ctf.h>
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#include <elf.h>
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#include <err.h>
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#include <fcntl.h>
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#include <gelf.h>
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#include <libelf.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdint.h>
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@ -60,19 +61,9 @@ const char *ctf_fpenc2name(uint16_t);
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const char *ctf_off2name(struct ctf_header *, const char *, off_t,
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uint32_t);
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int elf_dump(char *, size_t, uint8_t);
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const char *elf_idx2sym(size_t *, uint8_t);
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/* elf.c */
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int iself(const char *, size_t);
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int elf_getshstab(const char *, size_t, const char **, size_t *);
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ssize_t elf_getsymtab(const char *, size_t filesize, const char *,
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size_t, const Elf_Sym **, size_t *, const char **,
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size_t *);
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ssize_t elf_getsection(char *, size_t, const char *, const char *,
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size_t, const char **, size_t *);
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char *decompress(const char *, size_t, off_t);
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int elf_dump(uint8_t);
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const char *elf_idx2sym(size_t *, uint8_t);
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int
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main(int argc, char *argv[])
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@ -121,119 +112,162 @@ main(int argc, char *argv[])
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if (flags == 0)
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flags = 0xff;
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if (elf_version(EV_CURRENT) == EV_NONE)
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errx(1, "elf_version: %s", elf_errmsg(-1));
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while ((filename = *argv++) != NULL)
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error |= dump(filename, flags);
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return error;
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}
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Elf *e;
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Elf_Scn *scnsymtab;
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size_t strtabndx, strtabsz, nsymb;
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int
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dump(const char *path, uint8_t flags)
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{
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struct stat st;
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int fd, error = 1;
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char *p;
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int fd, error = 1;
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fd = open(path, O_RDONLY);
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if (fd == -1) {
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warn("open");
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return 1;
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}
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if ((e = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
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warnx("elf_begin: %s", elf_errmsg(-1));
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goto done;
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}
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if (elf_kind(e) == ELF_K_ELF) {
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error = elf_dump(flags);
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elf_end(e);
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goto done;
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}
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elf_end(e);
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if (fstat(fd, &st) == -1) {
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warn("fstat");
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close(fd);
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return 1;
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goto done;
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}
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if ((uintmax_t)st.st_size > SIZE_MAX) {
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warnx("file too big to fit memory");
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close(fd);
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return 1;
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goto done;
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}
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p = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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if (p == MAP_FAILED)
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err(1, "mmap");
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if (iself(p, st.st_size)) {
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error = elf_dump(p, st.st_size, flags);
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} else if (isctf(p, st.st_size)) {
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if (isctf(p, st.st_size))
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error = ctf_dump(p, st.st_size, flags);
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}
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munmap(p, st.st_size);
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close(fd);
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done:
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close(fd);
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return error;
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}
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const char *strtab;
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const Elf_Sym *symtab;
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size_t strtabsz, nsymb;
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const char *
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elf_idx2sym(size_t *idx, uint8_t type)
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{
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const Elf_Sym *st;
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GElf_Sym sym;
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Elf_Data *data;
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char *name;
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size_t i;
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if (strtab == NULL)
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if (scnsymtab == NULL || strtabndx == 0)
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return NULL;
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data = NULL;
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while ((data = elf_rawdata(scnsymtab, data)) != NULL) {
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for (i = *idx + 1; i < nsymb; i++) {
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st = &symtab[i];
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if (ELF_ST_TYPE(st->st_info) != type)
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if (gelf_getsym(data, i, &sym) != &sym)
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continue;
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if (GELF_ST_TYPE(sym.st_info) != type)
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continue;
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if (sym.st_name >= strtabsz)
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break;
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if ((name = elf_strptr(e, strtabndx,
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sym.st_name)) == NULL)
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continue;
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if (st->st_name >= strtabsz)
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break;
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*idx = i;
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return strtab + st->st_name;
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return name;
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}
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}
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return NULL;
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}
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int
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elf_dump(char *p, size_t filesize, uint8_t flags)
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elf_dump(uint8_t flags)
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{
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Elf_Ehdr *eh = (Elf_Ehdr *)p;
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Elf_Shdr *sh;
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const char *shstab;
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size_t i, shstabsz;
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GElf_Shdr shdr;
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Elf_Scn *scn, *scnctf;
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Elf_Data *data;
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char *name;
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size_t shstrndx;
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int error = 1;
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/* Find section header string table location and size. */
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if (elf_getshstab(p, filesize, &shstab, &shstabsz))
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return 1;
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/* Find symbol table and associated string table. */
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if (elf_getsymtab(p, filesize, shstab, shstabsz, &symtab, &nsymb,
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&strtab, &strtabsz) == -1)
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warnx("symbol table not found");
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/* Find CTF section and dump it. */
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for (i = 0; i < eh->e_shnum; i++) {
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sh = (Elf_Shdr *)(p + eh->e_shoff + i * eh->e_shentsize);
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if ((sh->sh_link >= eh->e_shnum) ||
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(sh->sh_name >= shstabsz))
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continue;
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if (strncmp(shstab + sh->sh_name, ELF_CTF, strlen(ELF_CTF)))
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continue;
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if ((sh->sh_offset + sh->sh_size) > filesize)
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continue;
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if (!isctf(p + sh->sh_offset, sh->sh_size))
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break;
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return ctf_dump(p + sh->sh_offset, sh->sh_size, flags);
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if (elf_getshdrstrndx(e, &shstrndx) != 0) {
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warnx("elf_getshdrstrndx: %s", elf_errmsg(-1));
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return error;
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}
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scn = scnctf = NULL;
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while ((scn = elf_nextscn(e, scn)) != NULL) {
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if (gelf_getshdr(scn, &shdr) != &shdr) {
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warnx("elf_getshdr: %s", elf_errmsg(-1));
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return error;
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}
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if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
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warnx("elf_strptr: %s", elf_errmsg(-1));
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return error;
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}
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if (strcmp(name, ELF_CTF) == 0)
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scnctf = scn;
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if (strcmp(name, ELF_SYMTAB) == 0 &&
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shdr.sh_type == SHT_SYMTAB && shdr.sh_entsize != 0) {
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scnsymtab = scn;
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nsymb = shdr.sh_size / shdr.sh_entsize;
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}
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if (strcmp(name, ELF_STRTAB) == 0 &&
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shdr.sh_type == SHT_STRTAB) {
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strtabndx = elf_ndxscn(scn);
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strtabsz = shdr.sh_size;
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}
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}
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if (scnctf == NULL) {
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warnx("%s section not found", ELF_CTF);
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return 1;
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return error;
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}
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if (scnsymtab == NULL)
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warnx("symbol table not found");
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data = NULL;
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while ((data = elf_rawdata(scnctf, data)) != NULL) {
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if (data->d_buf == NULL) {
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warnx("%s section size is zero", ELF_CTF);
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return error;
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}
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if (isctf(data->d_buf, data->d_size))
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error |= ctf_dump(data->d_buf, data->d_size, flags);
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}
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return error;
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}
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int
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@ -1,348 +0,0 @@
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/* $OpenBSD: elf.c,v 1.8 2017/11/14 09:14:50 mpi Exp $ */
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/*
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* Copyright (c) 2016 Martin Pieuchot <mpi@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <machine/reloc.h>
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#include <assert.h>
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#include <elf.h>
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#include <err.h>
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#include <string.h>
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static int elf_reloc_size(unsigned long);
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static void elf_reloc_apply(const char *, size_t, const char *, size_t,
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ssize_t, char *, size_t);
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int
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iself(const char *p, size_t filesize)
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{
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Elf_Ehdr *eh = (Elf_Ehdr *)p;
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if (filesize < (off_t)sizeof(Elf_Ehdr)) {
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warnx("file too small to be ELF");
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return 0;
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}
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if (eh->e_ehsize < sizeof(Elf_Ehdr) || !IS_ELF(*eh))
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return 0;
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if (eh->e_ident[EI_CLASS] != ELFCLASS) {
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warnx("unexpected word size %u", eh->e_ident[EI_CLASS]);
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return 0;
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}
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if (eh->e_ident[EI_VERSION] != ELF_TARG_VER) {
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warnx("unexpected version %u", eh->e_ident[EI_VERSION]);
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return 0;
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}
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if (eh->e_ident[EI_DATA] >= ELFDATANUM) {
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warnx("unexpected data format %u", eh->e_ident[EI_DATA]);
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return 0;
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}
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if (eh->e_shoff > filesize) {
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warnx("bogus section table offset 0x%llx", (off_t)eh->e_shoff);
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return 0;
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}
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if (eh->e_shentsize < sizeof(Elf_Shdr)) {
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warnx("bogus section header size %u", eh->e_shentsize);
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return 0;
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}
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if (eh->e_shnum > (filesize - eh->e_shoff) / eh->e_shentsize) {
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warnx("bogus section header count %u", eh->e_shnum);
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return 0;
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}
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if (eh->e_shstrndx >= eh->e_shnum) {
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warnx("bogus string table index %u", eh->e_shstrndx);
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return 0;
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}
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return 1;
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}
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int
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elf_getshstab(const char *p, size_t filesize, const char **shstab,
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size_t *shstabsize)
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{
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Elf_Ehdr *eh = (Elf_Ehdr *)p;
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Elf_Shdr *sh;
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size_t shoff;
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shoff = eh->e_shoff + eh->e_shstrndx * eh->e_shentsize;
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if (shoff > (filesize - sizeof(*sh))) {
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warnx("unexpected string table size");
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return -1;
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}
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sh = (Elf_Shdr *)(p + shoff);
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if (sh->sh_type != SHT_STRTAB) {
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warnx("unexpected string table type");
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return -1;
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}
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if (sh->sh_offset > filesize) {
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warnx("bogus string table offset");
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return -1;
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}
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if (sh->sh_size > filesize - sh->sh_offset) {
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warnx("bogus string table size");
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return -1;
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}
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if (shstab != NULL)
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*shstab = p + sh->sh_offset;
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if (shstabsize != NULL)
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*shstabsize = sh->sh_size;
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return 0;
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}
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ssize_t
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elf_getsymtab(const char *p, size_t filesize, const char *shstab,
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size_t shstabsz, const Elf_Sym **symtab, size_t *nsymb, const char **strtab,
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size_t *strtabsz)
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{
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Elf_Ehdr *eh = (Elf_Ehdr *)p;
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Elf_Shdr *sh, *symsh;
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size_t snlen, shoff;
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ssize_t i;
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snlen = strlen(ELF_SYMTAB);
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symsh = NULL;
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for (i = 0; i < eh->e_shnum; i++) {
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shoff = eh->e_shoff + i * eh->e_shentsize;
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if (shoff > (filesize - sizeof(*sh)))
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continue;
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sh = (Elf_Shdr *)(p + shoff);
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if (sh->sh_type != SHT_SYMTAB)
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continue;
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if ((sh->sh_link >= eh->e_shnum) || (sh->sh_name >= shstabsz))
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continue;
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if (sh->sh_offset > filesize)
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continue;
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if (sh->sh_size > (filesize - sh->sh_offset))
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continue;
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if (sh->sh_entsize == 0)
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continue;
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if (strncmp(shstab + sh->sh_name, ELF_SYMTAB, snlen) == 0) {
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if (symtab != NULL)
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*symtab = (Elf_Sym *)(p + sh->sh_offset);
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if (nsymb != NULL)
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*nsymb = (sh->sh_size / sh->sh_entsize);
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symsh = sh;
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break;
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}
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}
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if (symsh == NULL || (symsh->sh_link >= eh->e_shnum))
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return -1;
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shoff = eh->e_shoff + symsh->sh_link * eh->e_shentsize;
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if (shoff > (filesize - sizeof(*sh)))
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return -1;
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sh = (Elf_Shdr *)(p + shoff);
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if ((sh->sh_offset + sh->sh_size) > filesize)
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return -1;
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if (strtab != NULL)
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*strtab = p + sh->sh_offset;
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if (strtabsz != NULL)
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*strtabsz = sh->sh_size;
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return i;
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}
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ssize_t
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elf_getsection(char *p, size_t filesize, const char *sname, const char *shstab,
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size_t shstabsz, const char **psdata, size_t *pssz)
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{
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Elf_Ehdr *eh = (Elf_Ehdr *)p;
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Elf_Shdr *sh;
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char *sdata = NULL;
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size_t snlen, shoff, ssz = 0;
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ssize_t sidx, i;
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snlen = strlen(sname);
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if (snlen == 0)
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return -1;
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/* Find the given section. */
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for (i = 0; i < eh->e_shnum; i++) {
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shoff = eh->e_shoff + i * eh->e_shentsize;
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if (shoff > (filesize - sizeof(*sh)))
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continue;
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sh = (Elf_Shdr *)(p + shoff);
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if ((sh->sh_link >= eh->e_shnum) || (sh->sh_name >= shstabsz))
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continue;
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if (sh->sh_offset > filesize)
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continue;
|
||||
|
||||
if (sh->sh_size > (filesize - sh->sh_offset))
|
||||
continue;
|
||||
|
||||
if (strncmp(shstab + sh->sh_name, sname, snlen) == 0) {
|
||||
sidx = i;
|
||||
sdata = p + sh->sh_offset;
|
||||
ssz = sh->sh_size;
|
||||
elf_reloc_apply(p, filesize, shstab, shstabsz, sidx,
|
||||
sdata, ssz);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (sdata == NULL)
|
||||
return -1;
|
||||
|
||||
if (psdata != NULL)
|
||||
*psdata = sdata;
|
||||
if (pssz != NULL)
|
||||
*pssz = ssz;
|
||||
|
||||
return sidx;
|
||||
}
|
||||
|
||||
static int
|
||||
elf_reloc_size(unsigned long type)
|
||||
{
|
||||
switch (type) {
|
||||
#ifdef R_X86_64_64
|
||||
case R_X86_64_64:
|
||||
return sizeof(uint64_t);
|
||||
#endif
|
||||
#ifdef R_X86_64_32
|
||||
case R_X86_64_32:
|
||||
return sizeof(uint32_t);
|
||||
#endif
|
||||
#ifdef RELOC_32
|
||||
case RELOC_32:
|
||||
return sizeof(uint32_t);
|
||||
#endif
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
#define ELF_WRITE_RELOC(buf, val, rsize) \
|
||||
do { \
|
||||
if (rsize == 4) { \
|
||||
uint32_t v32 = val; \
|
||||
memcpy(buf, &v32, sizeof(v32)); \
|
||||
} else { \
|
||||
uint64_t v64 = val; \
|
||||
memcpy(buf, &v64, sizeof(v64)); \
|
||||
} \
|
||||
} while (0)
|
||||
|
||||
static void
|
||||
elf_reloc_apply(const char *p, size_t filesize, const char *shstab,
|
||||
size_t shstabsz, ssize_t sidx, char *sdata, size_t ssz)
|
||||
{
|
||||
Elf_Ehdr *eh = (Elf_Ehdr *)p;
|
||||
Elf_Shdr *sh;
|
||||
Elf_Rel *rel = NULL;
|
||||
Elf_RelA *rela = NULL;
|
||||
const Elf_Sym *symtab, *sym;
|
||||
ssize_t symtabidx;
|
||||
size_t nsymb, rsym, rtyp, roff;
|
||||
size_t shoff, i, j;
|
||||
uint64_t value;
|
||||
int rsize;
|
||||
|
||||
/* Find symbol table location and number of symbols. */
|
||||
symtabidx = elf_getsymtab(p, filesize, shstab, shstabsz, &symtab,
|
||||
&nsymb, NULL, NULL);
|
||||
if (symtabidx == -1) {
|
||||
warnx("symbol table not found");
|
||||
return;
|
||||
}
|
||||
|
||||
/* Apply possible relocation. */
|
||||
for (i = 0; i < eh->e_shnum; i++) {
|
||||
shoff = eh->e_shoff + i * eh->e_shentsize;
|
||||
if (shoff > (filesize - sizeof(*sh)))
|
||||
continue;
|
||||
|
||||
sh = (Elf_Shdr *)(p + shoff);
|
||||
if (sh->sh_size == 0)
|
||||
continue;
|
||||
|
||||
if ((sh->sh_info != sidx) || (sh->sh_link != symtabidx))
|
||||
continue;
|
||||
|
||||
if (sh->sh_offset > filesize)
|
||||
continue;
|
||||
|
||||
if (sh->sh_size > (filesize - sh->sh_offset))
|
||||
continue;
|
||||
|
||||
switch (sh->sh_type) {
|
||||
case SHT_RELA:
|
||||
rela = (Elf_RelA *)(p + sh->sh_offset);
|
||||
for (j = 0; j < (sh->sh_size / sizeof(Elf_RelA)); j++) {
|
||||
rsym = ELF_R_SYM(rela[j].r_info);
|
||||
rtyp = ELF_R_TYPE(rela[j].r_info);
|
||||
roff = rela[j].r_offset;
|
||||
if (rsym >= nsymb)
|
||||
continue;
|
||||
if (roff >= filesize)
|
||||
continue;
|
||||
sym = &symtab[rsym];
|
||||
value = sym->st_value + rela[j].r_addend;
|
||||
|
||||
rsize = elf_reloc_size(rtyp);
|
||||
if (rsize == -1 || roff + rsize >= ssz)
|
||||
continue;
|
||||
|
||||
ELF_WRITE_RELOC(sdata + roff, value, rsize);
|
||||
}
|
||||
break;
|
||||
case SHT_REL:
|
||||
rel = (Elf_Rel *)(p + sh->sh_offset);
|
||||
for (j = 0; j < (sh->sh_size / sizeof(Elf_Rel)); j++) {
|
||||
rsym = ELF_R_SYM(rel[j].r_info);
|
||||
rtyp = ELF_R_TYPE(rel[j].r_info);
|
||||
roff = rel[j].r_offset;
|
||||
if (rsym >= nsymb)
|
||||
continue;
|
||||
if (roff >= filesize)
|
||||
continue;
|
||||
sym = &symtab[rsym];
|
||||
value = sym->st_value;
|
||||
|
||||
rsize = elf_reloc_size(rtyp);
|
||||
if (rsize == -1 || roff + rsize >= ssz)
|
||||
continue;
|
||||
|
||||
ELF_WRITE_RELOC(sdata + roff, value, rsize);
|
||||
}
|
||||
break;
|
||||
default:
|
||||
continue;
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user