| // general protection fault in trace_probe_unlink |
| // https://syzkaller.appspot.com/bug?id=1d95acc5a947b06ba299fc18527b568c5d2f60b0 |
| // status:open |
| // autogenerated by syzkaller (https://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <dirent.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/prctl.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| static void sleep_ms(uint64_t ms) |
| { |
| usleep(ms * 1000); |
| } |
| |
| static uint64_t current_time_ms(void) |
| { |
| struct timespec ts; |
| if (clock_gettime(CLOCK_MONOTONIC, &ts)) |
| exit(1); |
| return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; |
| } |
| |
| #define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off)) |
| #define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len) \ |
| *(type*)(addr) = \ |
| htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | \ |
| (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len)))) |
| |
| static bool write_file(const char* file, const char* what, ...) |
| { |
| char buf[1024]; |
| va_list args; |
| va_start(args, what); |
| vsnprintf(buf, sizeof(buf), what, args); |
| va_end(args); |
| buf[sizeof(buf) - 1] = 0; |
| int len = strlen(buf); |
| int fd = open(file, O_WRONLY | O_CLOEXEC); |
| if (fd == -1) |
| return false; |
| if (write(fd, buf, len) != len) { |
| int err = errno; |
| close(fd); |
| errno = err; |
| return false; |
| } |
| close(fd); |
| return true; |
| } |
| |
| static int inject_fault(int nth) |
| { |
| int fd; |
| fd = open("/proc/thread-self/fail-nth", O_RDWR); |
| if (fd == -1) |
| exit(1); |
| char buf[16]; |
| sprintf(buf, "%d", nth + 1); |
| if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) |
| exit(1); |
| return fd; |
| } |
| |
| static void kill_and_wait(int pid, int* status) |
| { |
| kill(-pid, SIGKILL); |
| kill(pid, SIGKILL); |
| int i; |
| for (i = 0; i < 100; i++) { |
| if (waitpid(-1, status, WNOHANG | __WALL) == pid) |
| return; |
| usleep(1000); |
| } |
| DIR* dir = opendir("/sys/fs/fuse/connections"); |
| if (dir) { |
| for (;;) { |
| struct dirent* ent = readdir(dir); |
| if (!ent) |
| break; |
| if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) |
| continue; |
| char abort[300]; |
| snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", |
| ent->d_name); |
| int fd = open(abort, O_WRONLY); |
| if (fd == -1) { |
| continue; |
| } |
| if (write(fd, abort, 1) < 0) { |
| } |
| close(fd); |
| } |
| closedir(dir); |
| } else { |
| } |
| while (waitpid(-1, status, __WALL) != pid) { |
| } |
| } |
| |
| static void setup_test() |
| { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| write_file("/proc/self/oom_score_adj", "1000"); |
| } |
| |
| static void setup_fault() |
| { |
| static struct { |
| const char* file; |
| const char* val; |
| bool fatal; |
| } files[] = { |
| {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true}, |
| {"/sys/kernel/debug/fail_futex/ignore-private", "N", false}, |
| {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false}, |
| {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false}, |
| {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false}, |
| }; |
| unsigned i; |
| for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) { |
| if (!write_file(files[i].file, files[i].val)) { |
| if (files[i].fatal) |
| exit(1); |
| } |
| } |
| } |
| |
| static void execute_one(void); |
| |
| #define WAIT_FLAGS __WALL |
| |
| static void loop(void) |
| { |
| int iter; |
| for (iter = 0;; iter++) { |
| int pid = fork(); |
| if (pid < 0) |
| exit(1); |
| if (pid == 0) { |
| setup_test(); |
| execute_one(); |
| exit(0); |
| } |
| int status = 0; |
| uint64_t start = current_time_ms(); |
| for (;;) { |
| if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) |
| break; |
| sleep_ms(1); |
| if (current_time_ms() - start < 5 * 1000) |
| continue; |
| kill_and_wait(pid, &status); |
| break; |
| } |
| } |
| } |
| |
| uint64_t r[1] = {0xffffffffffffffff}; |
| |
| void execute_one(void) |
| { |
| intptr_t res = 0; |
| memcpy((void*)0x20000000, "./bus\000", 6); |
| res = syscall(__NR_open, 0x20000000, 0x141042, 0); |
| if (res != -1) |
| r[0] = res; |
| syscall(__NR_mmap, 0x20003000, 0x2000, 0, 0x1012, r[0], 0); |
| syscall(__NR_write, r[0], 0, 0); |
| syscall(__NR_write, r[0], 0, 0); |
| *(uint32_t*)0x20000180 = 6; |
| *(uint32_t*)0x20000184 = 0x70; |
| *(uint8_t*)0x20000188 = 0; |
| *(uint8_t*)0x20000189 = 0; |
| *(uint8_t*)0x2000018a = 0; |
| *(uint8_t*)0x2000018b = 0; |
| *(uint32_t*)0x2000018c = 0; |
| *(uint64_t*)0x20000190 = 0; |
| *(uint64_t*)0x20000198 = 0; |
| *(uint64_t*)0x200001a0 = 0; |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 0, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 1, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 2, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 3, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 4, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 5, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 6, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 7, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 8, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 9, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 10, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 11, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 12, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 13, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 14, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 15, 2); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 17, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 18, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 19, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 20, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 21, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 22, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 23, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 24, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 25, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 26, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 27, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 28, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 29, 35); |
| *(uint32_t*)0x200001b0 = 0; |
| *(uint32_t*)0x200001b4 = 0; |
| *(uint64_t*)0x200001b8 = 0x20000000; |
| *(uint64_t*)0x200001c0 = 0; |
| *(uint64_t*)0x200001c8 = 0; |
| *(uint64_t*)0x200001d0 = 0; |
| *(uint32_t*)0x200001d8 = 0; |
| *(uint32_t*)0x200001dc = 0; |
| *(uint64_t*)0x200001e0 = 0; |
| *(uint32_t*)0x200001e8 = 0; |
| *(uint16_t*)0x200001ec = 0; |
| *(uint16_t*)0x200001ee = 0; |
| inject_fault(6); |
| syscall(__NR_perf_event_open, 0x20000180, 0, 0, -1, 0); |
| } |
| int main(void) |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| setup_fault(); |
| loop(); |
| return 0; |
| } |