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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/string.h>
#include <linux/list.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("wzt");
struct module *m = &__this_module;
int print_module_test(void)
{
struct module *mod;
list_for_each_entry(mod, &m->list, list) {
printk("%s\n", mod->name);
}
return NULL;
}
static int list_print_init(void)
{
printk("load list_print module.\n");
print_module_test();
return 0;
}
static void list_print_exit(void)
{
printk("unload list_print module.\n");
}
module_init(list_print_init);
module_exit(list_print_exit);

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[root@localhost list]# uname -a
Linux localhost.localdomain 2.6.18-128.el5 #1 SMP Wed Jan 21 10:44:23 EST 2009 i686 i686 i386 GNU/Linux

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[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.18-53.el5xen #1 SMP Mon Nov 12 03:26:12 EST 2007 i686 i686 i386 GNU/Linux

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[root@localhost ~]# insmod list.ko
insmod: error inserting 'list.ko': -1 Invalid module format

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[root@localhost ~]# dmesg|tail -n 1
list: disagrees about version of symbol struct_module

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[root@localhost linux-2.6.18]# grep -r -i 'disagrees about' kernel/
kernel/module.c: printk("%s: disagrees about version of symbol %s\n",

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/* Allocate and load the module: note that size of section 0 is always
zero, and we rely on this for optional sections. */
static struct module *load_module(void __user *umod,
unsigned long len,
const char __user *uargs)
{
...
if (!check_modstruct_version(sechdrs, versindex, mod)) {
err = -ENOEXEC;
goto free_hdr;
}
modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
/* This is allowed: modprobe --force will invalidate it. */
if (!modmagic) {
add_taint(TAINT_FORCED_MODULE);
printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
mod->name);
} else if (!same_magic(modmagic, vermagic)) {
printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
mod->name, modmagic, vermagic);
err = -ENOEXEC;
goto free_hdr;
}
...
}

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static inline int check_modstruct_version(Elf_Shdr *sechdrs,
unsigned int versindex,
struct module *mod)
{
const unsigned long *crc;
struct module *owner;
if (!__find_symbol("struct_module", &owner, &crc, 1))
BUG();
return check_version(sechdrs, versindex, "struct_module", mod,
crc);
}

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static int check_version(Elf_Shdr *sechdrs,
unsigned int versindex,
const char *symname,
struct module *mod,
const unsigned long *crc)
{
unsigned int i, num_versions;
struct modversion_info *versions;
/* Exporting module didn't supply crcs? OK, we're already tainted. */
if (!crc)
return 1;
versions = (void *) sechdrs[versindex].sh_addr;
num_versions = sechdrs[versindex].sh_size
/ sizeof(struct modversion_info);
for (i = 0; i < num_versions; i++) {
if (strcmp(versions[i].name, symname) != 0)
continue;
if (versions[i].crc == *crc)
return 1;
printk("%s: disagrees about version of symbol %s\n",
mod->name, symname);
DEBUGP("Found checksum %lX vs module %lX\n",
*crc, versions[i].crc);
return 0;
}
/* Not in module's version table. OK, but that taints the kernel. */
if (!(tainted & TAINT_FORCED_MODULE)) {
printk("%s: no version for \"%s\" found: kernel tainted.\n",
mod->name, symname);
add_taint(TAINT_FORCED_MODULE);
}
return 1;
}

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[root@localhost list]# cat list.mod.c
#include <linux/module.h>
#include <linux/vermagic.h>
#include <linux/compiler.h>
MODULE_INFO(vermagic, VERMAGIC_STRING);
struct module __this_module
__attribute__((section(".gnu.linkonce.this_module"))) = {
.name = KBUILD_MODNAME,
.init = init_module,
#ifdef CONFIG_MODULE_UNLOAD
.exit = cleanup_module,
#endif
};
static const struct modversion_info ____versions[]
__attribute_used__
__attribute__((section("__versions"))) = {
{ 0x89e24b9c, "struct_module" },
{ 0x1b7d4074, "printk" },
};
static const char __module_depends[]
__attribute_used__
__attribute__((section(".modinfo"))) =
"depends=";
MODULE_INFO(srcversion, "26DB52D8A56205333D414B9");

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[root@localhost list]# modinfo list.ko
filename: list.ko
author: wzt
license: GPL
srcversion: 26DB52D8A56205333D414B9
depends:
vermagic: 2.6.18-128.el5 SMP mod_unload 686 REGPARM 4KSTACKS gcc-4.1

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/* First part is kernel version, which we ignore. */
static inline int same_magic(const char *amagic, const char *bmagic)
{
amagic += strcspn(amagic, " ");
bmagic += strcspn(bmagic, " ");
return strcmp(amagic, bmagic) == 0;
}

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for (i = 0; i < num_versions; i++) {
if (strcmp(versions[i].name, symname) != 0)
continue;
if (versions[i].crc == *crc)
return 1;
printk("%s: disagrees about version of symbol %s\n",
mod->name, symname);
DEBUGP("Found checksum %lX vs module %lX\n",
*crc, versions[i].crc);
return 0;
}
/* Not in module's version table. OK, but that taints the kernel. */
if (!(tainted & TAINT_FORCED_MODULE)) {
printk("%s: no version for \"%s\" found: kernel tainted.\n",
mod->name, symname);
add_taint(TAINT_FORCED_MODULE);
}
return 1;

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PHONY += __modpost
__modpost: $(wildcard vmlinux) $(modules:.ko=.o) FORCE
$(call cmd,modpost)

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PHONY += __modpost
__modpost: $(wildcard vmlinux) $(modules:.ko=.o) FORCE
$(call cmd,modpost)
@sleep 30

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[root@localhost list]# cat list.mod.c
#include <linux/module.h>
#include <linux/vermagic.h>
#include <linux/compiler.h>
MODULE_INFO(vermagic, VERMAGIC_STRING);
struct module __this_module
__attribute__((section(".gnu.linkonce.this_module"))) = {
.name = KBUILD_MODNAME,
.init = init_module,
#ifdef CONFIG_MODULE_UNLOAD
.exit = cleanup_module,
#endif
};
static const struct modversion_info ____versions[]
__attribute_used__
__attribute__((section("__versions"))) = {
{ 0x89e24b9c, "stauct_module" },
{ 0x1b7d4074, "printk" },
};
static const char __module_depends[]
__attribute_used__
__attribute__((section(".modinfo"))) =
"depends=";
MODULE_INFO(srcversion, "26DB52D8A56205333D414B9");

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[root@localhost ~]# insmod list.ko
[root@localhost ~]# dmesg|tail
ata_piix
libata
sd_mod
scsi_mod
ext3
jbd
ehci_hcd
ohci_hcd
uhci_hcd

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for (i = 0; i < num_versions; i++) {
if (strcmp(versions[i].name, symname) != 0)
continue;
if (versions[i].crc == *crc)
return 1;
DEBUGP("Found checksum %lX vs module %lX\n",
*crc, versions[i].crc);
goto bad_version;
}
printk(KERN_WARNING "%s: no symbol version for %s\n",
mod->name, symname);
return 0;
bad_version:
printk("%s: disagrees about version of symbol %s\n",
mod->name, symname);
return 0;

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[root@localhost boot]# grep 'struct_module' symvers-2.6.18-128.el5
0x89e24b9c struct_module vmlinux EXPORT_SYMBOL

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[root@localhost list]# modinfo /lib/modules/2.6.18-128.el5/kernel/fs/ext3/ext3.ko
filename: /lib/modules/2.6.18-128.el5/kernel/fs/ext3/ext3.ko
license: GPL
description: Second Extended Filesystem with journaling extensions
author: Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others
srcversion: B048AC103E5034604A721C5
depends: jbd
vermagic: 2.6.18-128.el5 SMP mod_unload 686 REGPARM 4KSTACKS gcc-4.1
module_sig: 883f3504977495e4f3f897cd3dced211288209f551cc1da557f96ea18d9a4efd6cfb0fc2612e009c8845fd776c825d586f492ceab19e17b2319da8f

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/*
* Linux kernel module fucker
*
* by wzt <[email]wzt.wzt@gmail.com[/email]>
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <elf.h>
#include <sys/stat.h>
#include <sys/mman.h>
#define MODULE_NAME_LEN (64 - sizeof(unsigned long))
struct modversion_info
{
unsigned long crc;
char name[MODULE_NAME_LEN];
};
Elf32_Ehdr *ehdr = NULL;
Elf32_Phdr *phdr = NULL;
Elf32_Shdr *shdr = NULL;
Elf32_Shdr *shstrtab = NULL;
Elf32_Sym *dynsym_ptr = NULL;
Elf32_Sym *symtab_ptr = NULL;
Elf32_Sym *dynstr_ptr = NULL;
char *Real_strtab = NULL;
char *dynstr = NULL;
char *strtab_ptr = NULL;
char dynstr_buffer[2048];
char strtab_buffer[4096];
char *real_strtab = NULL;
unsigned int shstrtab_off, shstrtab_len, shstrtab_num;
unsigned int strtab_off, strtab_size;
int elf_fd;
struct stat f_stat;
void usage(char *pro)
{
fprintf(stderr, "usage: %s <options> <module>\n\n", pro);
fprintf(stderr, "-w -v\tCheck vermgaic in module.\n");
fprintf(stderr, "-w -c\tCheck crc value in module.\n");
fprintf(stderr, "-s -v <new_vermagic>\tSet vermagic in module.\n");
fprintf(stderr, "-s -c\tSet crc value in module.\n");
exit(0);
}
int init_load_elf(char *elf_file)
{
char buff[1024];
elf_fd = open(elf_file, O_RDWR);
if (elf_fd == -1) {
perror("open");
return 0;
}
fprintf(stderr, "[+] Open %s ok.\n", elf_file);
if (fstat(elf_fd, &f_stat) == -1) {
perror("fstat");
return 0;
}
ehdr = (Elf32_Ehdr *)mmap(NULL, f_stat.st_size, PROT_WRITE|PROT_READ, MAP_SHARED, elf_fd, 0);
if(ehdr == MAP_FAILED) {
perror("mmap");
return 0;
}
phdr = (Elf32_Phdr *)((unsigned long)ehdr + ehdr->e_phoff);
shdr = (Elf32_Shdr *)((unsigned long)ehdr + ehdr->e_shoff);
shstrtab = &shdr[ehdr->e_shstrndx];
shstrtab_off = (unsigned int)shstrtab->sh_offset;
shstrtab_len = shstrtab->sh_size;
real_strtab = (char *)( (unsigned long)ehdr + shstrtab_off );
printf("[+] .Shstrtab Size :0x%x,%d\n", shstrtab->sh_size, shstrtab->sh_name);
printf("[+] .Shstrtab Off: 0x%x\n", shstrtab_off);
return 1;
}
int display_module_crc_info(void)
{
struct modversion_info *versions;
char *buff = NULL;
unsigned int version_off, version_size, num_versions;
int i, j;
buff = (char *)malloc(shstrtab_len + 2);
if (!buff) {
fprintf(stderr, "[-] Malloc failed.\n");
return 0;
}
memcpy(buff, real_strtab, shstrtab_len + 1);
for (i = 0 ; i < (int)ehdr->e_shnum ; i++){
if (!strcmp(buff + shdr[i].sh_name,"__versions")){
printf("[+] found section %s.\n", buff + shdr[i].sh_name);
version_off = (unsigned int)shdr[i].sh_offset;
version_size = (unsigned int)shdr[i].sh_size;
printf("[+] version off: 0x%x\n", version_off);
printf("[+] version size: 0x%x\n", version_size);
break;
}
}
printf("[+] %x,%x\n", (unsigned long)ehdr + version_off, shdr[i].sh_addr);
versions = (void *)((unsigned long)ehdr + version_off);
num_versions = version_size / sizeof(struct modversion_info);
printf("[+] num_versions: %d\n", num_versions);
for (j = 0; j < num_versions; j++) {
printf("[+] %s:0x%08x.\n", versions[j].name, versions[j].crc);
}
free(buff);
return 1;
}
int set_module_crc_info(void)
{
struct modversion_info *versions;
char *buff = NULL;
unsigned int version_off, version_size, num_versions;
int i, j;
buff = (char *)malloc(shstrtab_len + 2);
if (!buff) {
fprintf(stderr, "[-] Malloc failed.\n");
return 0;
}
memcpy(buff, real_strtab, shstrtab_len + 1);
for (i = 0 ; i < (int)ehdr->e_shnum ; i++){
if (!strcmp(buff + shdr[i].sh_name,"__versions")){
printf("[+] found section %s.\n", buff + shdr[i].sh_name);
version_off = (unsigned int)shdr[i].sh_offset;
version_size = (unsigned int)shdr[i].sh_size;
printf("[+] version off: 0x%x\n", version_off);
printf("[+] version size: 0x%x\n", version_size);
break;
}
}
printf("[+] %x,%x\n", (unsigned long)ehdr + version_off, shdr[i].sh_addr);
versions = (void *)((unsigned long)ehdr + version_off);
num_versions = version_size / sizeof(struct modversion_info);
printf("[+] num_versions: %d\n", num_versions);
for (j = 0; j < num_versions; j++) {
printf("[+] %s:0x%08x.\n", versions[j].name, versions[j].crc);
if (!strcmp(versions[j].name, "struct_module")) {
fprintf(stderr, "[+] Found symbol struct_module.\n");
versions[j].name[0] = 'T';
break;
}
}
for (j = 0; j < num_versions; j++) {
printf("[+] %s:0x%08x.\n", versions[j].name, versions[j].crc);
}
free(buff);
return 1;
}
static char *next_string(char *string, unsigned long *secsize)
{
/* Skip non-zero chars */
while (string[0]) {
string++;
if ((*secsize)-- <= 1)
return NULL;
}
/* Skip any zero padding. */
while (!string[0]) {
string++;
if ((*secsize)-- <= 1)
return NULL;
}
return string;
}
static char *get_modinfo(Elf32_Shdr *sechdrs, unsigned int info, const char *tag)
{
char *p;
unsigned int taglen = strlen(tag);
unsigned long size = sechdrs[info].sh_size;
for (p = (char *)(ehdr +sechdrs[info].sh_offset); p; p = next_string(p, &size)) {
if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
return p + taglen + 1;
}
return NULL;
}
int display_module_vermagic_info(void)
{
char *buff, *p;
char *ver = "vermagic";
unsigned int taglen = strlen(ver);
int size, i;
buff = (char *)malloc(shstrtab_len + 2);
if (!buff) {
fprintf(stderr, "[-] Malloc failed.\n");
return 0;
}
memcpy(buff, real_strtab, shstrtab_len + 1);
for (i = 0 ; i < (int)ehdr->e_shnum ; i++){
if (!strcmp(buff + shdr[i].sh_name,".modinfo")){
printf("[+] found section %s.\n", buff + shdr[i].sh_name);
break;
}
}
size = shdr[i].sh_size;
printf("[+] size: 0x%x.\n", size);
p = (char *)((unsigned long)ehdr + shdr[i].sh_offset);
printf("[+] 0x%08x\n", p);
for (; p; p = next_string(p, &size)) {
printf("[+] %s\n", p);
if (strncmp(p, "vermagic", taglen) == 0 && p[taglen] == '=') {
printf("[+] %s\n", p + taglen + 1);
//memset(p + taglen + 1, 'A', 30);
}
}
return 1;
}
int set_module_vermagic_info(char *new_vermagic)
{
char *buff, *p;
char *ver = "vermagic";
unsigned int taglen = strlen(ver);
int size, i;
buff = (char *)malloc(shstrtab_len + 2);
if (!buff) {
fprintf(stderr, "[-] Malloc failed.\n");
return 0;
}
memcpy(buff, real_strtab, shstrtab_len + 1);
for (i = 0 ; i < (int)ehdr->e_shnum ; i++){
if (!strcmp(buff + shdr[i].sh_name,".modinfo")){
printf("[+] found section %s.\n", buff + shdr[i].sh_name);
break;
}
}
size = shdr[i].sh_size;
printf("[+] size: 0x%x.\n", size);
p = (char *)((unsigned long)ehdr + shdr[i].sh_offset);
printf("[+] 0x%08x\n", p);
for (; p; p = next_string(p, &size)) {
printf("[+] %s\n", p);
if (strncmp(p, "vermagic", taglen) == 0 && p[taglen] == '=') {
printf("[+] %s\n", p + taglen + 1);
if (strlen(p + taglen + 1) < strlen(new_vermagic)) {
printf("[-] New vermagic len must < current magic len.\n");
return 0;
}
memset(p + taglen + 1, '\0', strlen(new_vermagic));
memcpy(p + taglen + 1, new_vermagic, strlen(new_vermagic));
}
}
return 1;
}
int exit_elf_load(void)
{
close(elf_fd);
if (munmap(ehdr, f_stat.st_size) == -1) {
return 0;
}
return 1;
}
int main(int argc, char **argv)
{
if (argc == 1) {
usage(argv[0]);
}
if (!strcmp(argv[1], "-w") && !strcmp(argv[2], "-c")) {
fprintf(stderr, "[+] Display %s module crc value.\n", argv[3]);
if (!init_load_elf(argv[3])) {
fprintf(stderr, "[-] Init elf load failed.\n");
return 0;
}
display_module_crc_info();
exit_elf_load();
}
else if (!strcmp(argv[1], "-s") && !strcmp(argv[2], "-c")) {
fprintf(stderr, "[+] Set %s module crc value.\n", argv[3]);
if (!init_load_elf(argv[3])) {
fprintf(stderr, "[-] Init elf load failed.\n");
return 0;
}
set_module_crc_info();
exit_elf_load();
}
if (!strcmp(argv[1], "-w") && !strcmp(argv[2], "-v")) {
fprintf(stderr, "[+] Display %s module crc value.\n", argv[3]);
if (!init_load_elf(argv[3])) {
fprintf(stderr, "[-] Init elf load failed.\n");
return 0;
}
display_module_vermagic_info();
exit_elf_load();
}
if (!strcmp(argv[1], "-s") && !strcmp(argv[2], "-v")) {
fprintf(stderr, "[+] Display %s module crc value.\n", argv[4]);
if (!init_load_elf(argv[4])) {
fprintf(stderr, "[-] Init elf load failed.\n");
return 0;
}
set_module_vermagic_info(argv[3]);
exit_elf_load();
}
else {
return 0;
}
}

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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/string.h>
#include <linux/list.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("wzt");
struct module *m = &__this_module;
int print_module_test(void)
{
struct module *mod;
list_for_each_entry(mod, &m->list, list) {
printk("%s\n", mod->name);
}
return NULL;
}
static int list_print_init(void)
{
printk("load list_print module.\n");
print_module_test();
return 0;
}
static void list_print_exit(void)
{
printk("unload list_print module.\n");
}
module_init(list_print_init);
module_exit(list_print_exit);

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/*
* Linux kernel module fucker
*
* by wzt <[email]wzt.wzt@gmail.com[/email]>
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <elf.h>
#include <sys/stat.h>
#include <sys/mman.h>
#define MODULE_NAME_LEN (64 - sizeof(unsigned long))
struct modversion_info
{
unsigned long crc;
char name[MODULE_NAME_LEN];
};
Elf32_Ehdr *ehdr = NULL;
Elf32_Phdr *phdr = NULL;
Elf32_Shdr *shdr = NULL;
Elf32_Shdr *shstrtab = NULL;
Elf32_Sym *dynsym_ptr = NULL;
Elf32_Sym *symtab_ptr = NULL;
Elf32_Sym *dynstr_ptr = NULL;
char *Real_strtab = NULL;
char *dynstr = NULL;
char *strtab_ptr = NULL;
char dynstr_buffer[2048];
char strtab_buffer[4096];
char *real_strtab = NULL;
unsigned int shstrtab_off, shstrtab_len, shstrtab_num;
unsigned int strtab_off, strtab_size;
int elf_fd;
struct stat f_stat;
void usage(char *pro)
{
fprintf(stderr, "usage: %s <options> <module>\n\n", pro);
fprintf(stderr, "-w -v\tCheck vermgaic in module.\n");
fprintf(stderr, "-w -c\tCheck crc value in module.\n");
fprintf(stderr, "-s -v <new_vermagic>\tSet vermagic in module.\n");
fprintf(stderr, "-s -c\tSet crc value in module. please append two more arguments after <module>: <symbol> <crc>. i.e. %s -s -c sample.ko module_layout 0xa925871a\n", pro);
exit(0);
}
int init_load_elf(char *elf_file)
{
char buff[1024];
elf_fd = open(elf_file, O_RDWR);
if (elf_fd == -1) {
perror("open");
return 0;
}
fprintf(stderr, "[+] Open %s ok.\n", elf_file);
if (fstat(elf_fd, &f_stat) == -1) {
perror("fstat");
return 0;
}
ehdr = (Elf32_Ehdr *)mmap(NULL, f_stat.st_size, PROT_WRITE|PROT_READ, MAP_SHARED, elf_fd, 0);
if(ehdr == MAP_FAILED) {
perror("mmap");
return 0;
}
phdr = (Elf32_Phdr *)((unsigned long)ehdr + ehdr->e_phoff);
shdr = (Elf32_Shdr *)((unsigned long)ehdr + ehdr->e_shoff);
shstrtab = &shdr[ehdr->e_shstrndx];
shstrtab_off = (unsigned int)shstrtab->sh_offset;
shstrtab_len = shstrtab->sh_size;
real_strtab = (char *)( (unsigned long)ehdr + shstrtab_off );
printf("[+] .Shstrtab Size :0x%x,%d\n", shstrtab->sh_size, shstrtab->sh_name);
printf("[+] .Shstrtab Off: 0x%x\n", shstrtab_off);
return 1;
}
int display_module_crc_info(void)
{
struct modversion_info *versions;
char *buff = NULL;
unsigned int version_off, version_size, num_versions;
int i, j;
buff = (char *)malloc(shstrtab_len + 2);
if (!buff) {
fprintf(stderr, "[-] Malloc failed.\n");
return 0;
}
memcpy(buff, real_strtab, shstrtab_len + 1);
for (i = 0 ; i < (int)ehdr->e_shnum ; i++){
if (!strcmp(buff + shdr[i].sh_name,"__versions")){
printf("[+] found section %s.\n", buff + shdr[i].sh_name);
version_off = (unsigned int)shdr[i].sh_offset;
version_size = (unsigned int)shdr[i].sh_size;
printf("[+] version off: 0x%x\n", version_off);
printf("[+] version size: 0x%x\n", version_size);
break;
}
}
printf("[+] %x,%x\n", (unsigned long)ehdr + version_off, shdr[i].sh_addr);
versions = (void *)((unsigned long)ehdr + version_off);
num_versions = version_size / sizeof(struct modversion_info);
printf("[+] num_versions: %d\n", num_versions);
for (j = 0; j < num_versions; j++) {
printf("[+] %s:0x%08x.\n", versions[j].name, versions[j].crc);
}
free(buff);
return 1;
}
int set_module_crc_info(char* moduleName, char* moduleCrc)
{
struct modversion_info *versions;
char *buff = NULL;
unsigned int version_off, version_size, num_versions;
int i, j;
buff = (char *)malloc(shstrtab_len + 2);
if (!buff) {
fprintf(stderr, "[-] Malloc failed.\n");
return 0;
}
memcpy(buff, real_strtab, shstrtab_len + 1);
for (i = 0 ; i < (int)ehdr->e_shnum ; i++){
if (!strcmp(buff + shdr[i].sh_name,"__versions")){
printf("[+] found section %s.\n", buff + shdr[i].sh_name);
version_off = (unsigned int)shdr[i].sh_offset;
version_size = (unsigned int)shdr[i].sh_size;
printf("[+] version off: 0x%x\n", version_off);
printf("[+] version size: 0x%x\n", version_size);
break;
}
}
printf("[+] %x,%x\n", (unsigned long)ehdr + version_off, shdr[i].sh_addr);
versions = (void *)((unsigned long)ehdr + version_off);
num_versions = version_size / sizeof(struct modversion_info);
printf("[+] num_versions: %d\n", num_versions);
for (j = 0; j < num_versions; j++) {
printf("[+] %s:0x%08x.\n", versions[j].name, versions[j].crc);
if (moduleName != NULL && !strcmp(versions[j].name, moduleName)) {
if (moduleCrc != NULL) {
fprintf(stderr, "[+] Found symbol %s, and will set crc code to %s\n", moduleName, moduleCrc);
sscanf(moduleCrc, "0x%08x", &versions[j].crc);
} else {
fprintf(stderr, "[+] Found symbol %s, please input the crc code (like format: 0xa925871a):\n", moduleName);
scanf("0x%08x", &versions[j].crc);
}
break;
}
}
printf("[+] after set moduel crc:\n");
for (j = 0; j < num_versions; j++) {
printf("[+] %s:0x%08x.\n", versions[j].name, versions[j].crc);
}
free(buff);
return 1;
}
static char *next_string(char *string, unsigned long *secsize)
{
/* Skip non-zero chars */
while (string[0]) {
string++;
if ((*secsize)-- <= 1)
return NULL;
}
/* Skip any zero padding. */
while (!string[0]) {
string++;
if ((*secsize)-- <= 1)
return NULL;
}
return string;
}
static char *get_modinfo(Elf32_Shdr *sechdrs, unsigned int info, const char *tag)
{
char *p;
unsigned int taglen = strlen(tag);
unsigned long size = sechdrs[info].sh_size;
for (p = (char *)(ehdr +sechdrs[info].sh_offset); p; p = next_string(p, &size)) {
if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
return p + taglen + 1;
}
return NULL;
}
int display_module_vermagic_info(void)
{
char *buff, *p;
char *ver = "vermagic";
unsigned int taglen = strlen(ver);
int size, i;
buff = (char *)malloc(shstrtab_len + 2);
if (!buff) {
fprintf(stderr, "[-] Malloc failed.\n");
return 0;
}
memcpy(buff, real_strtab, shstrtab_len + 1);
for (i = 0 ; i < (int)ehdr->e_shnum ; i++){
if (!strcmp(buff + shdr[i].sh_name,".modinfo")){
printf("[+] found section %s.\n", buff + shdr[i].sh_name);
break;
}
}
size = shdr[i].sh_size;
printf("[+] size: 0x%x.\n", size);
p = (char *)((unsigned long)ehdr + shdr[i].sh_offset);
printf("[+] 0x%08x\n", p);
for (; p; p = next_string(p, &size)) {
printf("[+] %s\n", p);
if (strncmp(p, "vermagic", taglen) == 0 && p[taglen] == '=') {
printf("[+] %s\n", p + taglen + 1);
//memset(p + taglen + 1, 'A', 30);
}
}
return 1;
}
int set_module_vermagic_info(char *new_vermagic)
{
char *buff, *p;
char *ver = "vermagic";
unsigned int taglen = strlen(ver);
int size, i;
buff = (char *)malloc(shstrtab_len + 2);
if (!buff) {
fprintf(stderr, "[-] Malloc failed.\n");
return 0;
}
memcpy(buff, real_strtab, shstrtab_len + 1);
for (i = 0 ; i < (int)ehdr->e_shnum ; i++){
if (!strcmp(buff + shdr[i].sh_name,".modinfo")){
printf("[+] found section %s.\n", buff + shdr[i].sh_name);
break;
}
}
size = shdr[i].sh_size;
printf("[+] size: 0x%x.\n", size);
p = (char *)((unsigned long)ehdr + shdr[i].sh_offset);
printf("[+] 0x%08x\n", p);
for (; p; p = next_string(p, &size)) {
printf("[+] %s\n", p);
if (strncmp(p, "vermagic", taglen) == 0 && p[taglen] == '=') {
printf("[+] %s\n", p + taglen + 1);
if (strlen(p + taglen + 1) < strlen(new_vermagic)) {
printf("[-] New vermagic len must < current magic len.\n");
return 0;
}
memset(p + taglen + 1, '\0', strlen(new_vermagic));
memcpy(p + taglen + 1, new_vermagic, strlen(new_vermagic));
}
}
return 1;
}
int exit_elf_load(void)
{
close(elf_fd);
if (munmap(ehdr, f_stat.st_size) == -1) {
return 0;
}
return 1;
}
int main(int argc, char **argv)
{
if (argc == 1) {
usage(argv[0]);
}
if (!strcmp(argv[1], "-w") && !strcmp(argv[2], "-c")) {
fprintf(stderr, "[+] Display %s module crc value.\n", argv[3]);
if (!init_load_elf(argv[3])) {
fprintf(stderr, "[-] Init elf load failed.\n");
return 0;
}
display_module_crc_info();
exit_elf_load();
}
else if (!strcmp(argv[1], "-s") && !strcmp(argv[2], "-c")) {
fprintf(stderr, "[+] Set %s module crc value.\n", argv[3]);
if (!init_load_elf(argv[3])) {
fprintf(stderr, "[-] Init elf load failed.\n");
return 0;
}
set_module_crc_info( argc >= 4 ? argv[4] : NULL, argc >= 5 ? argv[5] : NULL);
exit_elf_load();
}
if (!strcmp(argv[1], "-w") && !strcmp(argv[2], "-v")) {
fprintf(stderr, "[+] Display %s module crc value.\n", argv[3]);
if (!init_load_elf(argv[3])) {
fprintf(stderr, "[-] Init elf load failed.\n");
return 0;
}
display_module_vermagic_info();
exit_elf_load();
}
if (!strcmp(argv[1], "-s") && !strcmp(argv[2], "-v")) {
fprintf(stderr, "[+] Display %s module crc value.\n", argv[4]);
if (!init_load_elf(argv[4])) {
fprintf(stderr, "[-] Init elf load failed.\n");
return 0;
}
set_module_vermagic_info(argv[3]);
exit_elf_load();
}
else {
return 0;
}
}

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