// https://syzkaller.appspot.com/bug?id=1f0fc473c0dd243a6b72b1b802dde6950fd14c68 // 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 #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; } #define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1) #define BITMASK_LEN_OFF(type, bf_off, bf_len) \ (type)(BITMASK_LEN(type, (bf_len)) << (bf_off)) #define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len) \ if ((bf_off) == 0 && (bf_len) == 0) { \ *(type*)(addr) = (type)(val); \ } else { \ type new_val = *(type*)(addr); \ new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len)); \ new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off); \ *(type*)(addr) = new_val; \ } static void setup_common() { if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { } } static void loop(); static void sandbox_common() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); setsid(); struct rlimit rlim; rlim.rlim_cur = rlim.rlim_max = 160 << 20; setrlimit(RLIMIT_AS, &rlim); rlim.rlim_cur = rlim.rlim_max = 8 << 20; setrlimit(RLIMIT_MEMLOCK, &rlim); rlim.rlim_cur = rlim.rlim_max = 136 << 20; setrlimit(RLIMIT_FSIZE, &rlim); rlim.rlim_cur = rlim.rlim_max = 1 << 20; setrlimit(RLIMIT_STACK, &rlim); rlim.rlim_cur = rlim.rlim_max = 0; setrlimit(RLIMIT_CORE, &rlim); rlim.rlim_cur = rlim.rlim_max = 256; setrlimit(RLIMIT_NOFILE, &rlim); if (unshare(CLONE_NEWNS)) { } if (unshare(CLONE_NEWIPC)) { } if (unshare(0x02000000)) { } if (unshare(CLONE_NEWUTS)) { } if (unshare(CLONE_SYSVSEM)) { } } int wait_for_loop(int pid) { if (pid < 0) exit(1); int status = 0; while (waitpid(-1, &status, __WALL) != pid) { } return WEXITSTATUS(status); } static int do_sandbox_none(void) { if (unshare(CLONE_NEWPID)) { } int pid = fork(); if (pid != 0) return wait_for_loop(pid); setup_common(); sandbox_common(); if (unshare(CLONE_NEWNET)) { } loop(); exit(1); } 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; } } } uint64_t r[1] = {0xffffffffffffffff}; void execute_one(void) { long res = 0; *(uint32_t*)0x2001d000 = 1; *(uint32_t*)0x2001d004 = 0x70; *(uint8_t*)0x2001d008 = 0; *(uint8_t*)0x2001d009 = 0; *(uint8_t*)0x2001d00a = 0; *(uint8_t*)0x2001d00b = 0; *(uint32_t*)0x2001d00c = 0; *(uint64_t*)0x2001d010 = 0x7f; *(uint64_t*)0x2001d018 = 0; *(uint64_t*)0x2001d020 = 0; STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 0, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 1, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 2, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 3, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 4, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 5, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 6, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 7, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 8, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 9, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 10, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 11, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 12, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0x2000000, 13, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 14, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 15, 2); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 17, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 18, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 19, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 20, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 21, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 22, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 23, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 24, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 25, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 26, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 27, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 28, 1); STORE_BY_BITMASK(uint64_t, 0x2001d028, 0, 29, 35); *(uint32_t*)0x2001d030 = 0; *(uint32_t*)0x2001d034 = 0; *(uint64_t*)0x2001d038 = 0x20abe000; *(uint64_t*)0x2001d040 = 0; *(uint64_t*)0x2001d048 = 0; *(uint64_t*)0x2001d050 = 0; *(uint32_t*)0x2001d058 = 0; *(uint32_t*)0x2001d05c = 0; *(uint64_t*)0x2001d060 = 0; *(uint32_t*)0x2001d068 = 0; *(uint16_t*)0x2001d06c = 0; *(uint16_t*)0x2001d06e = 0; syscall(__NR_perf_event_open, 0x2001d000, 0, -1, -1, 0); res = syscall(__NR_socket, 0x40000000015, 5, 0); if (res != -1) r[0] = res; *(uint16_t*)0x200002c0 = 2; *(uint16_t*)0x200002c2 = htobe16(0x4e1c); *(uint8_t*)0x200002c4 = 0xac; *(uint8_t*)0x200002c5 = 0x14; *(uint8_t*)0x200002c6 = 0x14; *(uint8_t*)0x200002c7 = 0xbb; *(uint8_t*)0x200002c8 = 0; *(uint8_t*)0x200002c9 = 0; *(uint8_t*)0x200002ca = 0; *(uint8_t*)0x200002cb = 0; *(uint8_t*)0x200002cc = 0; *(uint8_t*)0x200002cd = 0; *(uint8_t*)0x200002ce = 0; *(uint8_t*)0x200002cf = 0; syscall(__NR_bind, r[0], 0x200002c0, 0x10); *(uint64_t*)0x20000200 = 0; *(uint64_t*)0x20000208 = 0x1c9c380; syscall(__NR_mq_timedsend, -1, 0x20000040, 0, 0, 0x20000200); } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (procid = 0; procid < 8; procid++) { if (fork() == 0) { do_sandbox_none(); } } sleep(1000000); return 0; }