// https://syzkaller.appspot.com/bug?id=8c4da1a9b89e6c42585bac6e4539dbc0cb7c49f1 // 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 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 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) { } } 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; for (iter = 0;; 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; } } } #ifndef __NR_sched_setattr #define __NR_sched_setattr 314 #endif uint64_t r[3] = {0x0, 0xffffffffffffffff, 0x0}; void execute_one(void) { intptr_t res = 0; syscall(__NR_prlimit64, 0, 0xeul, 0ul, 0ul); res = syscall(__NR_getpid); if (res != -1) r[0] = res; syscall(__NR_sched_setattr, r[0], 0ul, 0ul); *(uint32_t*)0x20000040 = 0x30; *(uint32_t*)0x20000044 = 2; *(uint64_t*)0x20000048 = 0; *(uint32_t*)0x20000050 = 0; *(uint32_t*)0x20000054 = 5; *(uint64_t*)0x20000058 = 0; *(uint64_t*)0x20000060 = 0; *(uint64_t*)0x20000068 = 0; *(uint32_t*)0x20000070 = 0; *(uint32_t*)0x20000074 = 0; syscall(__NR_sched_setattr, 0, 0x20000040ul, 0ul); syscall(__NR_pipe, 0ul); syscall(__NR_fcntl, -1, 0x407ul, 0ul); *(uint64_t*)0x20000000 = 0; *(uint64_t*)0x20000008 = 0; syscall(__NR_vmsplice, -1, 0x20000000ul, 1ul, 0ul); *(uint32_t*)0x20000080 = 0x30; *(uint32_t*)0x20000084 = 2; *(uint64_t*)0x20000088 = 0; *(uint32_t*)0x20000090 = 0; *(uint32_t*)0x20000094 = 3; *(uint64_t*)0x20000098 = 0; *(uint64_t*)0x200000a0 = 0; *(uint64_t*)0x200000a8 = 0; *(uint32_t*)0x200000b0 = 0; *(uint32_t*)0x200000b4 = 0; syscall(__NR_sched_setattr, 0, 0x20000080ul, 0ul); memcpy((void*)0x20000000, "./file0\000", 8); syscall(__NR_mkdir, 0x20000000ul, 0ul); memcpy((void*)0x200000c0, "./file0\000", 8); syscall(__NR_mount, 0x20000000ul, 0x200000c0ul, 0ul, 0x2001001ul, 0ul); syscall(__NR_bind, -1, 0ul, 0ul); syscall(__NR_socket, 0x10ul, 3ul, 0ul); res = syscall(__NR_socket, 0x11ul, 3ul, 0x300ul); if (res != -1) r[1] = res; memcpy((void*)0x20000180, "batadv0\000\000\000\000\000\000\000\000\000", 16); *(uint32_t*)0x20000190 = 0; res = syscall(__NR_ioctl, r[1], 0x8933ul, 0x20000180ul); if (res != -1) r[2] = *(uint32_t*)0x20000190; *(uint16_t*)0x20000100 = 0x11; *(uint16_t*)0x20000102 = htobe16(0); *(uint32_t*)0x20000104 = r[2]; *(uint16_t*)0x20000108 = 1; *(uint8_t*)0x2000010a = 0; *(uint8_t*)0x2000010b = 6; *(uint8_t*)0x2000010c = 0; *(uint8_t*)0x2000010d = 0; *(uint8_t*)0x2000010e = 0; *(uint8_t*)0x2000010f = 0; *(uint8_t*)0x20000110 = 0; *(uint8_t*)0x20000111 = 0; *(uint8_t*)0x20000112 = 0; *(uint8_t*)0x20000113 = 0; syscall(__NR_bind, -1, 0x20000100ul, 0xffffffffffffff7cul); syscall(__NR_sendmsg, -1, 0ul, 4ul); syscall(__NR_remap_file_pages, 0x20ffa000ul, 0x3000ul, 0ul, 3ul, 0ul); syscall(__NR_getsockopt, -1, 0x29ul, 0x22ul, 0ul, 0ul); *(uint32_t*)0x20000200 = 0; syscall(__NR_getsockname, -1, 0x20000100ul, 0x20000200ul); memcpy((void*)0x20000380, "./file0\000", 8); memcpy((void*)0x20000340, "./file0\000", 8); syscall(__NR_pivot_root, 0x20000380ul, 0x20000340ul); } int main(void) { syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }