// https://syzkaller.appspot.com/bug?id=9c3d5b8823cb5720147456775449fde5a96ebae2 // 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); 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"); } 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); } } } #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[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; memcpy((void*)0x20000000, "/dev/kvm\000", 9); res = syscall(__NR_openat, 0xffffffffffffff9cul, 0x20000000ul, 0ul, 0ul); if (res != -1) r[0] = res; res = syscall(__NR_ioctl, r[0], 0xae01, 0ul); if (res != -1) r[1] = res; res = syscall(__NR_eventfd2, 0, 0ul); if (res != -1) r[2] = res; res = syscall(__NR_eventfd2, 0, 0ul); if (res != -1) r[3] = res; *(uint64_t*)0x200003c0 = 0; *(uint64_t*)0x200003c8 = 0x20000380; *(uint32_t*)0x200003d0 = 0; *(uint32_t*)0x200003d4 = r[3]; *(uint32_t*)0x200003d8 = 0; *(uint8_t*)0x200003dc = 0; *(uint8_t*)0x200003dd = 0; *(uint8_t*)0x200003de = 0; *(uint8_t*)0x200003df = 0; *(uint8_t*)0x200003e0 = 0; *(uint8_t*)0x200003e1 = 0; *(uint8_t*)0x200003e2 = 0; *(uint8_t*)0x200003e3 = 0; *(uint8_t*)0x200003e4 = 0; *(uint8_t*)0x200003e5 = 0; *(uint8_t*)0x200003e6 = 0; *(uint8_t*)0x200003e7 = 0; *(uint8_t*)0x200003e8 = 0; *(uint8_t*)0x200003e9 = 0; *(uint8_t*)0x200003ea = 0; *(uint8_t*)0x200003eb = 0; *(uint8_t*)0x200003ec = 0; *(uint8_t*)0x200003ed = 0; *(uint8_t*)0x200003ee = 0; *(uint8_t*)0x200003ef = 0; *(uint8_t*)0x200003f0 = 0; *(uint8_t*)0x200003f1 = 0; *(uint8_t*)0x200003f2 = 0; *(uint8_t*)0x200003f3 = 0; *(uint8_t*)0x200003f4 = 0; *(uint8_t*)0x200003f5 = 0; *(uint8_t*)0x200003f6 = 0; *(uint8_t*)0x200003f7 = 0; *(uint8_t*)0x200003f8 = 0; *(uint8_t*)0x200003f9 = 0; *(uint8_t*)0x200003fa = 0; *(uint8_t*)0x200003fb = 0; *(uint8_t*)0x200003fc = 0; *(uint8_t*)0x200003fd = 0; *(uint8_t*)0x200003fe = 0; *(uint8_t*)0x200003ff = 0; syscall(__NR_ioctl, r[1], 0x4040ae79, 0x200003c0ul); *(uint64_t*)0x200000c0 = 0; *(uint64_t*)0x200000c8 = 0; *(uint32_t*)0x200000d0 = 0; *(uint32_t*)0x200000d4 = r[2]; *(uint32_t*)0x200000d8 = 0; *(uint8_t*)0x200000dc = 0; *(uint8_t*)0x200000dd = 0; *(uint8_t*)0x200000de = 0; *(uint8_t*)0x200000df = 0; *(uint8_t*)0x200000e0 = 0; *(uint8_t*)0x200000e1 = 0; *(uint8_t*)0x200000e2 = 0; *(uint8_t*)0x200000e3 = 0; *(uint8_t*)0x200000e4 = 0; *(uint8_t*)0x200000e5 = 0; *(uint8_t*)0x200000e6 = 0; *(uint8_t*)0x200000e7 = 0; *(uint8_t*)0x200000e8 = 0; *(uint8_t*)0x200000e9 = 0; *(uint8_t*)0x200000ea = 0; *(uint8_t*)0x200000eb = 0; *(uint8_t*)0x200000ec = 0; *(uint8_t*)0x200000ed = 0; *(uint8_t*)0x200000ee = 0; *(uint8_t*)0x200000ef = 0; *(uint8_t*)0x200000f0 = 0; *(uint8_t*)0x200000f1 = 0; *(uint8_t*)0x200000f2 = 0; *(uint8_t*)0x200000f3 = 0; *(uint8_t*)0x200000f4 = 0; *(uint8_t*)0x200000f5 = 0; *(uint8_t*)0x200000f6 = 0; *(uint8_t*)0x200000f7 = 0; *(uint8_t*)0x200000f8 = 0; *(uint8_t*)0x200000f9 = 0; *(uint8_t*)0x200000fa = 0; *(uint8_t*)0x200000fb = 0; *(uint8_t*)0x200000fc = 0; *(uint8_t*)0x200000fd = 0; *(uint8_t*)0x200000fe = 0; *(uint8_t*)0x200000ff = 0; syscall(__NR_ioctl, r[1], 0x4040ae79, 0x200000c0ul); *(uint64_t*)0x20000080 = 0; *(uint64_t*)0x20000088 = 0; *(uint32_t*)0x20000090 = 0; *(uint32_t*)0x20000094 = r[2]; *(uint32_t*)0x20000098 = 4; *(uint8_t*)0x2000009c = 0; *(uint8_t*)0x2000009d = 0; *(uint8_t*)0x2000009e = 0; *(uint8_t*)0x2000009f = 0; *(uint8_t*)0x200000a0 = 0; *(uint8_t*)0x200000a1 = 0; *(uint8_t*)0x200000a2 = 0; *(uint8_t*)0x200000a3 = 0; *(uint8_t*)0x200000a4 = 0; *(uint8_t*)0x200000a5 = 0; *(uint8_t*)0x200000a6 = 0; *(uint8_t*)0x200000a7 = 0; *(uint8_t*)0x200000a8 = 0; *(uint8_t*)0x200000a9 = 0; *(uint8_t*)0x200000aa = 0; *(uint8_t*)0x200000ab = 0; *(uint8_t*)0x200000ac = 0; *(uint8_t*)0x200000ad = 0; *(uint8_t*)0x200000ae = 0; *(uint8_t*)0x200000af = 0; *(uint8_t*)0x200000b0 = 0; *(uint8_t*)0x200000b1 = 0; *(uint8_t*)0x200000b2 = 0; *(uint8_t*)0x200000b3 = 0; *(uint8_t*)0x200000b4 = 0; *(uint8_t*)0x200000b5 = 0; *(uint8_t*)0x200000b6 = 0; *(uint8_t*)0x200000b7 = 0; *(uint8_t*)0x200000b8 = 0; *(uint8_t*)0x200000b9 = 0; *(uint8_t*)0x200000ba = 0; *(uint8_t*)0x200000bb = 0; *(uint8_t*)0x200000bc = 0; *(uint8_t*)0x200000bd = 0; *(uint8_t*)0x200000be = 0; *(uint8_t*)0x200000bf = 0; inject_fault(4); syscall(__NR_ioctl, r[1], 0x4040ae79, 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(); setup_fault(); loop(); return 0; }