// https://syzkaller.appspot.com/bug?id=b552fd21dcc819daf6e93017f72ee98cda4d978e // 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 (;;) { sleep_ms(10); if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } res = syscall(__NR_socket, /*domain=*/0xful, /*type=*/3ul, /*proto=*/2); if (res != -1) r[0] = res; *(uint64_t*)0x200000000040 = 3; *(uint32_t*)0x200000000048 = 0; *(uint64_t*)0x200000000050 = 0x200000000340; *(uint64_t*)0x200000000340 = 0x200000001880; memcpy((void*)0x200000001880, "\x02\x03\xfb\x02\x1e\x00\x00\x00\x2c\xbd\x70\x00\xfc\xdb\xdf\x25\x02" "\x00\x09\x00\x08\x00\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x05\x00" "\x06\x00\x00\x00\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x02\x00\x00\x00" "\x00\x00\x00\x00\x02\x00\x01\x00\x00\x00\x00\x00\x04\x00\x07\x0c\x00" "\x00\x00\x00\x05\x00\x05\x00\x00\x00\x00\x00\x0a\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x01\x07\x00\xe9\xff\x00\x00\x00\x00\x0e\x00\x08\x00\x08", 133); *(uint64_t*)0x200000000348 = 0xf0; *(uint64_t*)0x200000000058 = 1; *(uint64_t*)0x200000000060 = 7; *(uint64_t*)0x200000000068 = 0; *(uint32_t*)0x200000000070 = 0; syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0x200000000040ul, /*f=*/0ul); res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/6); if (res != -1) r[1] = res; *(uint64_t*)0x200000000040 = 0; *(uint32_t*)0x200000000048 = 0; *(uint64_t*)0x200000000050 = 0x2000000001c0; *(uint64_t*)0x2000000001c0 = 0x200000000480; memcpy((void*)0x200000000480, "\xfc\x00\x00\x00\x19\x00\x67\x4c\x00\x00\x00\x00\x00\x00\x00\x00\xe0" "\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe0\x00" "\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00", 64); *(uint32_t*)0x2000000004c0 = 0; *(uint32_t*)0x2000000004c4 = 0; memcpy( (void*)0x2000000004c8, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x40\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00" "\x00\x00\x00\x00\x44\x00\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x33", 137); *(uint64_t*)0x2000000001c8 = 0xfc; *(uint64_t*)0x200000000058 = 1; *(uint64_t*)0x200000000060 = 0; *(uint64_t*)0x200000000068 = 0; *(uint32_t*)0x200000000070 = 0; syscall(__NR_sendmsg, /*fd=*/r[1], /*msg=*/0x200000000040ul, /*f=*/0ul); res = syscall(__NR_socket, /*domain=*/0xaul, /*type=*/2ul, /*proto=*/0x73); if (res != -1) r[2] = res; *(uint64_t*)0x200000000540 = 0x200000000280; *(uint16_t*)0x200000000280 = 0xa; *(uint16_t*)0x200000000282 = htobe16(0x4e23); *(uint32_t*)0x200000000284 = htobe32(0xfffffbff); memset((void*)0x200000000288, 0, 16); *(uint32_t*)0x200000000298 = 0xffff8428; *(uint32_t*)0x200000000548 = 0x1c; *(uint64_t*)0x200000000550 = 0; *(uint64_t*)0x200000000558 = 0; *(uint64_t*)0x200000000560 = 0x200000000700; *(uint64_t*)0x200000000700 = 0x18; *(uint32_t*)0x200000000708 = 0x29; *(uint32_t*)0x20000000070c = 0x37; *(uint8_t*)0x200000000710 = 0x67; *(uint8_t*)0x200000000711 = 0; memset((void*)0x200000000712, 0, 6); *(uint64_t*)0x200000000718 = 0x14; *(uint32_t*)0x200000000720 = 0x29; *(uint32_t*)0x200000000724 = 0x34; *(uint32_t*)0x200000000728 = 2; *(uint64_t*)0x200000000730 = 0x18; *(uint32_t*)0x200000000738 = 0x29; *(uint32_t*)0x20000000073c = 0x36; *(uint8_t*)0x200000000740 = 0x5e; *(uint8_t*)0x200000000741 = 0; memset((void*)0x200000000742, 0, 6); *(uint64_t*)0x200000000568 = 0x48; *(uint32_t*)0x200000000570 = 0; syscall(__NR_sendmsg, /*fd=*/r[2], /*msg=*/0x200000000540ul, /*f=MSG_CONFIRM*/ 0x800ul); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; loop(); return 0; }