// https://syzkaller.appspot.com/bug?id=ed61486641c6d9d4d16203bd507cd83e44de7634 // 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 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); 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 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 < 5000) { continue; } kill_and_wait(pid, &status); break; } } } uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; res = -1; res = syz_open_dev(0xc, 4, 1); if (res != -1) r[0] = res; *(uint64_t*)0x20000100 = 0x20000340; memcpy( (void*)0x20000340, "\x9f\x81\x94\xbe\x5a\xce\x60\x2f\x09\x6d\x07\xff\x00\xcd\x66\x29\x96\x67" "\xb7\x05\x36\x34\x26\x23\xb3\x72\xd8\x2f\xef\xa0\x1f\x9a\x2d\x37\x85\x83" "\x29\x7f\x99\xb4\xe5\x97\x00\x00\x00\x00\x00\x00\x00\x81\xf4\x7c\xd0\xc1" "\x54\x49\x71\x2f\x00\xc5\x1c\x63\x8e\x6a\xea\x4a\x8d\xee\x82\x52\x86\xb3" "\x1a\x26\x0e\x60\x48\x2b\xb0\xb4\x17\x9b\x31\x5d\x02\xd6\xae\x2a\x66\xf0" "\xde\x24\x57\x45\xa9\x3f\x1c\x98\x84\x14\xbb\x8f\x83\x03\xf2\x80\xa1\x96" "\x49\x03\xc8\xc9\x18\xc3\x43\xd1\x82\x12\x5a\xd7\x3d\x38\xd7\x18\x76\xd5" "\x14\x34\x4c\x2c\xde\x87\x00\xe7\x6b\x24\x29\xc5\xac\xe9\x1e", 141); *(uint64_t*)0x20000108 = 0x8d; *(uint64_t*)0x20000110 = 0; *(uint64_t*)0x20000118 = 0; *(uint64_t*)0x20000120 = 0; *(uint64_t*)0x20000128 = 0; syscall(__NR_writev, r[0], 0x20000100ul, 3ul); *(uint32_t*)0x20000000 = 0xd; syscall(__NR_ioctl, r[0], 0x5423, 0x20000000ul); res = -1; res = syz_open_dev(0xc, 4, 1); if (res != -1) r[1] = res; syscall(__NR_ioctl, r[1], 0x540a, 0ul); res = -1; res = syz_open_dev(0xc, 4, 1); if (res != -1) r[2] = res; syscall(__NR_ioctl, r[2], 0x540a, 1ul); } 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); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }