// https://syzkaller.appspot.com/bug?id=d463fb9bf88946c8b83d95b2f216f295b50c70de // 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; } #define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off)) #define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len) \ *(type*)(addr) = \ htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | \ (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len)))) 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_mmap #define __NR_mmap 192 #endif #ifndef __NR_sendmsg #define __NR_sendmsg 370 #endif #ifndef __NR_socket #define __NR_socket 359 #endif #undef __NR_mmap #define __NR_mmap __NR_mmap2 uint64_t r[1] = {0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; res = syscall(__NR_socket, 0x10, 3, 0xc); if (res != -1) r[0] = res; *(uint32_t*)0x20001080 = 0; *(uint32_t*)0x20001084 = 0; *(uint32_t*)0x20001088 = 0x20001040; *(uint32_t*)0x20001040 = 0x20000780; *(uint32_t*)0x20000780 = 0x64; *(uint8_t*)0x20000784 = 2; *(uint8_t*)0x20000785 = 6; *(uint16_t*)0x20000786 = 1; *(uint32_t*)0x20000788 = 0; *(uint32_t*)0x2000078c = 0; *(uint8_t*)0x20000790 = 0; *(uint8_t*)0x20000791 = 0; *(uint16_t*)0x20000792 = htobe16(0); *(uint16_t*)0x20000794 = 0x10; *(uint16_t*)0x20000796 = 3; memcpy((void*)0x20000798, "bitmap:port\000", 12); *(uint16_t*)0x200007a4 = 5; *(uint16_t*)0x200007a6 = 4; *(uint8_t*)0x200007a8 = 0; *(uint16_t*)0x200007ac = 9; *(uint16_t*)0x200007ae = 2; memcpy((void*)0x200007b0, "syz0\000", 5); *(uint16_t*)0x200007b8 = 0x1c; STORE_BY_BITMASK(uint16_t, , 0x200007ba, 7, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x200007bb, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x200007bb, 1, 7, 1); *(uint16_t*)0x200007bc = 6; STORE_BY_BITMASK(uint16_t, , 0x200007be, 4, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x200007bf, 1, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x200007bf, 0, 7, 1); *(uint16_t*)0x200007c0 = htobe16(0); *(uint16_t*)0x200007c4 = 6; STORE_BY_BITMASK(uint16_t, , 0x200007c6, 5, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x200007c7, 1, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x200007c7, 0, 7, 1); *(uint16_t*)0x200007c8 = htobe16(0); *(uint16_t*)0x200007cc = 8; STORE_BY_BITMASK(uint16_t, , 0x200007ce, 8, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x200007cf, 1, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x200007cf, 0, 7, 1); *(uint32_t*)0x200007d0 = htobe32(0x18); *(uint16_t*)0x200007d4 = 5; *(uint16_t*)0x200007d6 = 5; *(uint8_t*)0x200007d8 = 0; *(uint16_t*)0x200007dc = 5; *(uint16_t*)0x200007de = 1; *(uint8_t*)0x200007e0 = 7; *(uint32_t*)0x20001044 = 0x64; *(uint32_t*)0x2000108c = 1; *(uint32_t*)0x20001090 = 0; *(uint32_t*)0x20001094 = 0; *(uint32_t*)0x20001098 = 0; syscall(__NR_sendmsg, (intptr_t)r[0], 0x20001080, 0); } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); loop(); return 0; }