// https://syzkaller.appspot.com/bug?id=c4117efdec586bbccac5428cce624863690bd3b8 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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; } 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*)0x20000240, "/dev/infiniband/rdma_cm\000", 24); res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000240, 2, 0); if (res != -1) r[0] = res; *(uint32_t*)0x20000100 = 0; *(uint16_t*)0x20000104 = 0x15; *(uint16_t*)0x20000106 = 0xfa00; *(uint64_t*)0x20000108 = 0; *(uint64_t*)0x20000110 = 0x20000040; *(uint16_t*)0x20000118 = 0x13f; *(uint8_t*)0x2000011a = 0; *(uint8_t*)0x2000011b = 0; *(uint8_t*)0x2000011c = 0; *(uint8_t*)0x2000011d = 0; *(uint8_t*)0x2000011e = 0; *(uint8_t*)0x2000011f = 0; syscall(__NR_write, r[0], 0x20000100, 0x20); *(uint64_t*)0x200001c0 = 0; *(uint16_t*)0x200001c8 = 2; *(uint16_t*)0x200001ca = htobe16(0); *(uint8_t*)0x200001cc = 0xac; *(uint8_t*)0x200001cd = 0x14; *(uint8_t*)0x200001ce = 0x14; *(uint8_t*)0x200001cf = 0; *(uint16_t*)0x200001d8 = 2; *(uint16_t*)0x200001da = htobe16(0); *(uint8_t*)0x200001dc = 0xac; *(uint8_t*)0x200001dd = 0x14; *(uint8_t*)0x200001de = 0x14; *(uint8_t*)0x200001df = 0xbb; *(uint16_t*)0x200001e8 = 2; *(uint16_t*)0x200001ea = htobe16(0); *(uint32_t*)0x200001ec = htobe32(0); *(uint16_t*)0x200001f8 = 0; *(uint16_t*)0x200001fa = 0; *(uint64_t*)0x20000200 = 0; *(uint64_t*)0x20000208 = 0; *(uint16_t*)0x20000210 = 0; *(uint64_t*)0x20000218 = 0; *(uint64_t*)0x20000220 = 0; *(uint64_t*)0x20000228 = 0; *(uint16_t*)0x20000230 = 0; syscall(__NR_ioctl, -1, 0x890b, 0x200001c0); memcpy((void*)0x20000140, "\x15\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00" "\xc8\x6b\x65\x25\x00\x00\x10", 19); inject_fault(0); syscall(__NR_write, r[0], 0x20000140, 0x1f3); } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); setup_fault(); loop(); return 0; }