// https://syzkaller.appspot.com/bug?id=8b01a793ad9f9a3a575189a2bdea572c55fe86d7 // 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 unsigned long long procid; 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 long syz_open_dev(volatile long a0, volatile long a1, volatile long a2) { if (a0 == 0xc || a0 == 0xb) { char buf[128]; sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2); return open(buf, O_RDWR, 0); } else { char buf[1024]; char* hash; strncpy(buf, (char*)a0, sizeof(buf) - 1); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } 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 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[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; res = syz_open_dev(0xc, 4, 0x15 + procid * 2); if (res != -1) r[0] = res; *(uint64_t*)0x20001440 = 0x20000180; memcpy((void*)0x20000180, "\x64\xf8\xc8\x4b\x9c\x01\x93\x23\xee\xc0\xe2\xd4\xd6\xf8\x53\x74\x01" "\x73\x25\x6a\x5a\x00\x3c\x89\x91\xc9\x33\x76\xcc\x01\x35\xdd\xca\x34" "\x97\x65\xd7\x24\x1e\xe9\x57\x82\x89\x1b\xb0\x6e\x2a\x80\x14\xc0\x49" "\xe7\x7d\x36\xb4\xfd\xd7\x33\x7b\x95\x1a\x2f\x2d\x9a\xd1\x94\xb4\x71" "\xc3\xb2\xeb\xa5\xa4\x55\x5c\xcf\xf7\x23\x8d\x25\x0a\x40\x3e\xc8\x40" "\x2a\xb9\x6d\xf5\xf2\x41\x00\xbb\x0e\xbb\xc5\xaf\x1f\xbb\x70\xd2\xb1" "\xae\x03\x96\x92\x26\x7b\x1f\xb9\x94\x42\xe5\x3e\xc9\xe1\xed\x7d\x6c" "\x9f\xfe\x26\xd2\x09\xea\x41\xa5\x2f\x32\x89\xc4\x61\xea\x7d\x8e\xfb" "\x5d\x2a\xc9\x97\xe0\x16\xd3\x81\x7e\xda\x68\xdb\x41\x98\xec\x64\x3b" "\x61\xf2\x09\x90\xd4\x03\xd3\x10\x6b\x79\xcd\x58\x27\x24\xa7\xef\xb1" "\x4d\x50\xe1\x14\x66\x06\x5d\x2c\xd9\x85\x98\x1e\x04\x32\xa8\x46\xf6" "\xb6\x80\xd8\x30\x29\xfe\xa7\x73\x0e\xec\x1f\xb6\xca\x1e\x3d\x98\xff" "\x93\xa3\x95\x2d\x64\xa4\x24\xa2\x12\xa9\x3f\xfc\x9b\x19\x46\x4f\x85" "\x9b\x78", 223); *(uint64_t*)0x20001448 = 0xdf; syscall(__NR_writev, r[0], 0x20001440ul, 1ul); memcpy((void*)0x20000180, "/dev/fb0\000", 9); res = syscall(__NR_openat, 0xffffffffffffff9cul, 0x20000180ul, 0ul, 0ul); if (res != -1) r[1] = res; *(uint32_t*)0x20000000 = 0; *(uint32_t*)0x20000004 = 0; *(uint32_t*)0x20000008 = 0; *(uint32_t*)0x2000000c = 0; *(uint32_t*)0x20000010 = 0; *(uint32_t*)0x20000014 = 0; *(uint32_t*)0x20000018 = 4; *(uint32_t*)0x2000001c = 0; *(uint32_t*)0x20000020 = 0; *(uint32_t*)0x20000024 = 0; *(uint32_t*)0x20000028 = 0; *(uint32_t*)0x2000002c = 0; *(uint32_t*)0x20000030 = 0x4000000; *(uint32_t*)0x20000034 = 0; *(uint32_t*)0x20000038 = 0; *(uint32_t*)0x2000003c = 0; *(uint32_t*)0x20000040 = 0; *(uint32_t*)0x20000044 = 0; *(uint32_t*)0x20000048 = 0; *(uint32_t*)0x2000004c = 0; *(uint32_t*)0x20000050 = 0; *(uint32_t*)0x20000054 = 0; *(uint32_t*)0x20000058 = 0; *(uint32_t*)0x2000005c = 0; *(uint32_t*)0x20000060 = 0; *(uint32_t*)0x20000064 = 0; *(uint32_t*)0x20000068 = 0; *(uint32_t*)0x2000006c = 0; *(uint32_t*)0x20000070 = 0; *(uint32_t*)0x20000074 = 0; *(uint32_t*)0x20000078 = 0; *(uint32_t*)0x2000007c = 0; *(uint32_t*)0x20000080 = 0; *(uint32_t*)0x20000084 = 2; *(uint32_t*)0x20000088 = 0; *(uint32_t*)0x2000008c = 0; *(uint32_t*)0x20000090 = 0; *(uint32_t*)0x20000094 = 0; *(uint32_t*)0x20000098 = 0; *(uint32_t*)0x2000009c = 0; syscall(__NR_ioctl, r[1], 0x4601ul, 0x20000000ul); } int main(void) { syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }