/**
* elf_read_shdrs - read the section headers from the buffer
*
* This function assumes that the section header table was checked for sanity.
* Use elf_is_ehdr_sane() if it wasn't.
*/
static int elf_read_shdrs(const char *buf, size_t len,
struct elf_info *elf_info)
{
size_t shdr_size, i;
/*
* e_shnum is at most 65536 so calculating
* the size of the section header cannot overflow.
*/
shdr_size = sizeof(struct elf_shdr) * elf_info->ehdr->e_shnum;
elf_info->sechdrs = kzalloc(shdr_size, GFP_KERNEL);
if (!elf_info->sechdrs)
return -ENOMEM;
for (i = 0; i < elf_info->ehdr->e_shnum; i++) {
int ret;
ret = elf_read_shdr(buf, len, elf_info, i);
if (ret) {
kfree(elf_info->sechdrs);
elf_info->sechdrs = NULL;
return ret;
}
}
return 0;
}
struct elf_file_t *elf_open(char *path)
{
struct elf_file_t *elf;
/* Create structure */
elf = calloc(1, sizeof(struct elf_file_t));
if (!elf)
fatal("elf_open: out of memory\n");
/// printf("\n length = %d\n",strlen(path));
/// printf("\n tryng to open %s\n",path);
/* Open file */
elf->f = fopen(path, "rb");
/// printf("\n error no is %d",errno);
if (!elf->f)
fatal("%s: cannot open executable file", path);
if (strlen(path) >= sizeof(elf->path))
fatal("%s: executable file path too long", path);
strcpy(elf->path, path);
/* Get file size */
fseek(elf->f, 0, SEEK_END);
elf->size = ftell(elf->f);
fseek(elf->f, 0, SEEK_SET);
/* Read header, section headers, and program headers. */
elf_debug("\n%s: reading ELF file\n", path);
elf_read_ehdr(elf);
elf_read_shdr(elf);
elf_read_phdr(elf);
/* Return elf file structure */
return elf;
}
static void remove_shnames(u64 shdr_offset, u16 n_shdr, u64 shstrtab_offset, u32 strtab_size)
{
u16 i;
u32 size;
struct elf_shdr s;
if (arch64)
size = 0x40;
else
size = 0x28;
for (i = 0; i < n_shdr; i++) {
elf_read_shdr(arch64, elf + shdr_offset + i * size, &s);
s.sh_name = 0;
if (s.sh_type == 3) {
s.sh_offset = shstrtab_offset;
s.sh_size = strtab_size;
}
elf_write_shdr(arch64, elf + shdr_offset + i * size, &s);
}
}
