// https://syzkaller.appspot.com/bug?id=4e787d7ede986c6bdabd8a46e10dcee11b5768c7 // 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 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); for (int 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"); } #define KMEMLEAK_FILE "/sys/kernel/debug/kmemleak" static void setup_leak() { if (!write_file(KMEMLEAK_FILE, "scan")) exit(1); sleep(5); if (!write_file(KMEMLEAK_FILE, "scan")) exit(1); if (!write_file(KMEMLEAK_FILE, "clear")) exit(1); } static void check_leaks(void) { int fd = open(KMEMLEAK_FILE, O_RDWR); if (fd == -1) exit(1); uint64_t start = current_time_ms(); if (write(fd, "scan", 4) != 4) exit(1); sleep(1); while (current_time_ms() - start < 4 * 1000) sleep(1); if (write(fd, "scan", 4) != 4) exit(1); static char buf[128 << 10]; ssize_t n = read(fd, buf, sizeof(buf) - 1); if (n < 0) exit(1); int nleaks = 0; if (n != 0) { sleep(1); if (write(fd, "scan", 4) != 4) exit(1); if (lseek(fd, 0, SEEK_SET) < 0) exit(1); n = read(fd, buf, sizeof(buf) - 1); if (n < 0) exit(1); buf[n] = 0; char* pos = buf; char* end = buf + n; while (pos < end) { char* next = strstr(pos + 1, "unreferenced object"); if (!next) next = end; char prev = *next; *next = 0; fprintf(stderr, "BUG: memory leak\n%s\n", pos); *next = prev; pos = next; nleaks++; } } if (write(fd, "clear", 5) != 5) exit(1); close(fd); if (nleaks) exit(1); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; 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; } check_leaks(); } } uint64_t r[1] = {0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; memcpy((void*)0x20000000, "/dev/video#\000", 12); res = -1; res = syz_open_dev(0x20000000, 3, 2); if (res != -1) r[0] = res; *(uint32_t*)0x20000080 = 3; *(uint16_t*)0x20000088 = 0; *(uint16_t*)0x2000008a = 0; *(uint16_t*)0x2000008c = 0; *(uint16_t*)0x2000008e = 0; *(uint16_t*)0x20000090 = 0; *(uint16_t*)0x20000092 = 0; *(uint16_t*)0x20000094 = 0; *(uint16_t*)0x20000096 = 0; *(uint16_t*)0x20000098 = 0; *(uint16_t*)0x2000009a = 0; *(uint16_t*)0x2000009c = 0; *(uint16_t*)0x2000009e = 0; *(uint16_t*)0x200000a0 = 0; *(uint16_t*)0x200000a2 = 0; *(uint16_t*)0x200000a4 = 0; *(uint16_t*)0x200000a6 = 0; *(uint16_t*)0x200000a8 = 0x101; *(uint16_t*)0x200000aa = 0; *(uint16_t*)0x200000ac = 0; *(uint16_t*)0x200000ae = 0; *(uint16_t*)0x200000b0 = 0; *(uint16_t*)0x200000b2 = 0; *(uint16_t*)0x200000b4 = 0; *(uint16_t*)0x200000b6 = 0; *(uint16_t*)0x200000b8 = 0; *(uint16_t*)0x200000ba = 0; *(uint16_t*)0x200000bc = 0; *(uint16_t*)0x200000be = 0; *(uint16_t*)0x200000c0 = 0; *(uint16_t*)0x200000c2 = 0; *(uint16_t*)0x200000c4 = 0; *(uint16_t*)0x200000c6 = 0; *(uint16_t*)0x200000c8 = 0; *(uint16_t*)0x200000ca = 0; *(uint16_t*)0x200000cc = 0; *(uint16_t*)0x200000ce = 0; *(uint16_t*)0x200000d0 = 0; *(uint16_t*)0x200000d2 = 0; *(uint16_t*)0x200000d4 = 0; *(uint16_t*)0x200000d6 = 0; *(uint16_t*)0x200000d8 = 0; *(uint16_t*)0x200000da = 0; *(uint16_t*)0x200000dc = 0; *(uint16_t*)0x200000de = 0; *(uint16_t*)0x200000e0 = 0; *(uint16_t*)0x200000e2 = 0; *(uint16_t*)0x200000e4 = 0; *(uint16_t*)0x200000e6 = 0; *(uint16_t*)0x200000e8 = 0; *(uint32_t*)0x200000ec = 0; *(uint32_t*)0x200000f0 = 0; *(uint32_t*)0x200000f4 = 0; syscall(__NR_ioctl, r[0], 0xc0d05605, 0x20000080ul); } int main(void) { syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); setup_leak(); loop(); return 0; }