// https://syzkaller.appspot.com/bug?id=4eb45dcd2b14bf4454c0d136ce3d0889b102f7ad // 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 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_connect #define __NR_connect 362 #endif #ifndef __NR_creat #define __NR_creat 8 #endif #ifndef __NR_fchdir #define __NR_fchdir 133 #endif #ifndef __NR_mmap #define __NR_mmap 192 #endif #ifndef __NR_open #define __NR_open 5 #endif #ifndef __NR_openat #define __NR_openat 295 #endif #ifndef __NR_pipe #define __NR_pipe 42 #endif #ifndef __NR_sendto #define __NR_sendto 369 #endif #ifndef __NR_setsockopt #define __NR_setsockopt 366 #endif #ifndef __NR_socket #define __NR_socket 359 #endif #ifndef __NR_splice #define __NR_splice 313 #endif #undef __NR_mmap #define __NR_mmap __NR_mmap2 uint64_t r[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; memcpy((void*)0x20000000, "./cgroup.cpu\000", 13); res = syscall(__NR_openat, 0xffffff9c, 0x20000000, 0x200002, 0); if (res != -1) r[0] = res; syscall(__NR_fchdir, (intptr_t)r[0]); memcpy((void*)0x20000180, "./bus\000", 6); syscall(__NR_creat, 0x20000180, 0); res = syscall(__NR_pipe, 0x20000380); if (res != -1) { r[1] = *(uint32_t*)0x20000380; r[2] = *(uint32_t*)0x20000384; } res = syscall(__NR_socket, 2, 1, 0); if (res != -1) r[3] = res; *(uint32_t*)0x20000080 = 1; syscall(__NR_setsockopt, (intptr_t)r[3], 6, 0x13, 0x20000080, 4); *(uint32_t*)0x20788ffc = 1; syscall(__NR_setsockopt, (intptr_t)r[3], 6, 0x14, 0x20788ffc, 0xfdf6); *(uint16_t*)0x20000000 = 2; *(uint16_t*)0x20000002 = htobe16(0); *(uint8_t*)0x20000004 = 0xac; *(uint8_t*)0x20000005 = 0x14; *(uint8_t*)0x20000006 = 0x14; *(uint8_t*)0x20000007 = 0xaa; syscall(__NR_connect, (intptr_t)r[3], 0x20000000, 0x10); memcpy((void*)0x20000100, "\xcc", 1); syscall(__NR_sendto, (intptr_t)r[3], 0x20000100, 0xffffff3d, 0, 0, 0); syscall(__NR_splice, (intptr_t)r[3], 0, (intptr_t)r[2], 0, 0x11001, 0); memcpy((void*)0x20000040, "./bus\000", 6); res = syscall(__NR_open, 0x20000040, 0x4082, 0); if (res != -1) r[4] = res; syscall(__NR_splice, (intptr_t)r[1], 0, (intptr_t)r[4], 0, -1, 0); } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); loop(); return 0; }