// https://syzkaller.appspot.com/bug?id=77f1cb05a2fd66c023f300f2da705f85bc02928a // 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 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 long syz_open_dev(long a0, long a1, 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) { } } #define SYZ_HAVE_SETUP_TEST 1 static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); } #define SYZ_HAVE_RESET_TEST 1 static void reset_test() { int fd; for (fd = 3; fd < 30; fd++) close(fd); } 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(); reset_test(); 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; } } } #ifndef __NR_memfd_create #define __NR_memfd_create 319 #endif uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { long res = 0; memcpy((void*)0x20000200, "/dev/loop#", 11); res = syz_open_dev(0x20000200, 0, 0x82); if (res != -1) r[0] = res; memcpy((void*)0x20000100, "\x74\x08\x6e\x75\x00\x00\x00\x00\x00\x00\x00\x00\x00\x8c\x00", 15); res = syscall(__NR_memfd_create, 0x20000100, 0); if (res != -1) r[1] = res; *(uint64_t*)0x20000340 = 0x20000040; memcpy((void*)0x20000040, "'", 1); *(uint64_t*)0x20000348 = 1; syscall(__NR_pwritev, r[1], 0x20000340, 1, 0x81805); syscall(__NR_ioctl, r[0], 0x4c00, r[1]); *(uint64_t*)0x20000000 = 0; syscall(__NR_sendfile, r[0], r[0], 0x20000000, 0x2000005); memcpy((void*)0x20000040, "/dev/loop#", 11); res = syz_open_dev(0x20000040, 0, 0x100082); if (res != -1) r[2] = res; memcpy((void*)0x20000200, "security.capability", 20); *(uint32_t*)0x200001c0 = 0x3000000; *(uint32_t*)0x200001c4 = 0xfff; *(uint32_t*)0x200001c8 = 0x7fff; *(uint32_t*)0x200001cc = 0xfffff801; *(uint32_t*)0x200001d0 = 0; *(uint32_t*)0x200001d4 = 0; syscall(__NR_fsetxattr, r[2], 0x20000200, 0x200001c0, 0x18, 1); } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }