// https://syzkaller.appspot.com/bug?id=d3c85e02ceda01f8616b57fc8af71fa0f13550a2 // 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); 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 < 5 * 1000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; *(uint64_t*)0x200000c0 = 0; *(uint32_t*)0x200000c8 = 0; *(uint64_t*)0x200000d0 = 0x208feff0; *(uint64_t*)0x208feff0 = 0; *(uint64_t*)0x208feff8 = 0; *(uint64_t*)0x200000d8 = 1; *(uint64_t*)0x200000e0 = 0; *(uint64_t*)0x200000e8 = 0; *(uint32_t*)0x200000f0 = 0; syscall(__NR_sendmsg, -1, 0x200000c0ul, 0ul); *(uint64_t*)0x20000100 = 4; *(uint32_t*)0x20000108 = 0; *(uint64_t*)0x20000110 = 0x208feff0; *(uint64_t*)0x208feff0 = 0x20000e00; memcpy((void*)0x20000e00, "\x02\x0d\x00\x00\x10\x00\x00\x00\x2f\x31\x44\xe8\x00\x00\x00\x00\x03" "\x00\x06\x00\x07\x20\x00\x00\x02\x00\x40\x00\xe0\x00\x00\x01\x00\x00" "\x00\xf5\x00\x00\x00\x00\x08\x00\x12\x00\x02\x00\x01\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x30\x00\x6c\x00\x02\x09\x00\x9f\x6e\xae\x02\x00" "\x00\x00\xad\xb2\x02\x00\x00\x00\x00\x15\x2c\x00\x80\x00\x00\x00\x00" "\x00\x00\x01\x02\x00\x14\xbb\x00\x00\x01\x04\x00\x00\x00\x00\x00\x00" "\x00\x00\x03\x00\x05\x00\x00\x20\x00\x00\x02", 113); *(uint64_t*)0x208feff8 = 0x80; *(uint64_t*)0x20000118 = 1; *(uint64_t*)0x20000120 = 0; *(uint64_t*)0x20000128 = 0; *(uint32_t*)0x20000130 = 0; syscall(__NR_sendmsg, -1, 0x20000100ul, 0ul); res = syscall(__NR_socket, 0xful, 3ul, 2); if (res != -1) r[0] = res; syscall(__NR_sendmmsg, r[0], 0x200000c0ul, 0x2c8ul, 0ul); res = syscall(__NR_socket, 0xaul, 1ul, 0x84); if (res != -1) r[1] = res; memcpy((void*)0x20847fff, "X", 1); *(uint16_t*)0x2005ffe4 = 0xa; *(uint16_t*)0x2005ffe6 = htobe16(0x4e23); *(uint32_t*)0x2005ffe8 = htobe32(0); *(uint64_t*)0x2005ffec = htobe64(0); *(uint64_t*)0x2005fff4 = htobe64(1); *(uint32_t*)0x2005fffc = 0; syscall(__NR_sendto, r[1], 0x20847ffful, 0x34000ul, 0ul, 0x2005ffe4ul, 0x1cul); } 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); loop(); return 0; }