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Don't dump core when the ELF file has no section headers. The ELF

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core files created by gcore are among those.
This commit is contained in:
Marcel Moolenaar 2014-06-19 20:12:28 +00:00
parent 8ea4f2ef51
commit a589e596c0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=267649
1 changed files with 24 additions and 9 deletions
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21
usr.bin/elfdump/elfdump.c
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@ -495,11 +495,19 @@ main(int ac, char **av)
phnum = elf_get_quarter(e, e, E_PHNUM);
shentsize = elf_get_quarter(e, e, E_SHENTSIZE);
p = (char *)e + phoff;
if (shoff > 0) {
sh = (char *)e + shoff;
shnum = elf_get_shnum(e, sh);
shstrndx = elf_get_shstrndx(e, sh);
offset = elf_get_off(e, (char *)sh + shstrndx * shentsize, SH_OFFSET);
offset = elf_get_off(e, (char *)sh + shstrndx * shentsize,
SH_OFFSET);
shstrtab = (char *)e + offset;
} else {
sh = NULL;
shnum = 0;
shstrndx = 0;
shstrtab = NULL;
}
for (i = 0; (u_int64_t)i < shnum; i++) {
name = elf_get_word(e, (char *)sh + i * shentsize, SH_NAME);
offset = elf_get_off(e, (char *)sh + i * shentsize, SH_OFFSET);
@ -616,8 +624,6 @@ elf_print_ehdr(Elf32_Ehdr *e, void *sh)
phentsize = elf_get_quarter(e, e, E_PHENTSIZE);
phnum = elf_get_quarter(e, e, E_PHNUM);
shentsize = elf_get_quarter(e, e, E_SHENTSIZE);
shnum = elf_get_shnum(e, sh);
shstrndx = elf_get_shstrndx(e, sh);
fprintf(out, "\nelf header:\n");
fprintf(out, "\n");
fprintf(out, "\te_ident: %s %s %s\n", ei_classes[class], ei_data[data],
@ -633,9 +639,13 @@ elf_print_ehdr(Elf32_Ehdr *e, void *sh)
fprintf(out, "\te_phentsize: %jd\n", (intmax_t)phentsize);
fprintf(out, "\te_phnum: %jd\n", (intmax_t)phnum);
fprintf(out, "\te_shentsize: %jd\n", (intmax_t)shentsize);
if (sh != NULL) {
shnum = elf_get_shnum(e, sh);
shstrndx = elf_get_shstrndx(e, sh);
fprintf(out, "\te_shnum: %jd\n", (intmax_t)shnum);
fprintf(out, "\te_shstrndx: %jd\n", (intmax_t)shstrndx);
}
}
static void
elf_print_phdr(Elf32_Ehdr *e, void *p)
@ -697,6 +707,11 @@ elf_print_shdr(Elf32_Ehdr *e, void *sh)
void *v;
int i;
if (sh == NULL) {
fprintf(out, "\nNo section headers\n");
return;
}
shentsize = elf_get_quarter(e, e, E_SHENTSIZE);
shnum = elf_get_shnum(e, sh);
fprintf(out, "\nsection header:\n");