// https://syzkaller.appspot.com/bug?id=efc234d0d3f0d6b900fe67b5334dc76cde55dbd4 // 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 #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; } #define MAX_FDS 30 static void setup_common() { if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { } } static void loop(); static void sandbox_common() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setsid(); struct rlimit rlim; rlim.rlim_cur = rlim.rlim_max = (200 << 20); setrlimit(RLIMIT_AS, &rlim); rlim.rlim_cur = rlim.rlim_max = 32 << 20; setrlimit(RLIMIT_MEMLOCK, &rlim); rlim.rlim_cur = rlim.rlim_max = 136 << 20; setrlimit(RLIMIT_FSIZE, &rlim); rlim.rlim_cur = rlim.rlim_max = 1 << 20; setrlimit(RLIMIT_STACK, &rlim); rlim.rlim_cur = rlim.rlim_max = 0; setrlimit(RLIMIT_CORE, &rlim); rlim.rlim_cur = rlim.rlim_max = 256; setrlimit(RLIMIT_NOFILE, &rlim); if (unshare(CLONE_NEWNS)) { } if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) { } if (unshare(CLONE_NEWIPC)) { } if (unshare(0x02000000)) { } if (unshare(CLONE_NEWUTS)) { } if (unshare(CLONE_SYSVSEM)) { } typedef struct { const char* name; const char* value; } sysctl_t; static const sysctl_t sysctls[] = { {"/proc/sys/kernel/shmmax", "16777216"}, {"/proc/sys/kernel/shmall", "536870912"}, {"/proc/sys/kernel/shmmni", "1024"}, {"/proc/sys/kernel/msgmax", "8192"}, {"/proc/sys/kernel/msgmni", "1024"}, {"/proc/sys/kernel/msgmnb", "1024"}, {"/proc/sys/kernel/sem", "1024 1048576 500 1024"}, }; unsigned i; for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++) write_file(sysctls[i].name, sysctls[i].value); } static int wait_for_loop(int pid) { if (pid < 0) exit(1); int status = 0; while (waitpid(-1, &status, __WALL) != pid) { } return WEXITSTATUS(status); } static void drop_caps(void) { struct __user_cap_header_struct cap_hdr = {}; struct __user_cap_data_struct cap_data[2] = {}; cap_hdr.version = _LINUX_CAPABILITY_VERSION_3; cap_hdr.pid = getpid(); if (syscall(SYS_capget, &cap_hdr, &cap_data)) exit(1); const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE); cap_data[0].effective &= ~drop; cap_data[0].permitted &= ~drop; cap_data[0].inheritable &= ~drop; if (syscall(SYS_capset, &cap_hdr, &cap_data)) exit(1); } static int do_sandbox_none(void) { if (unshare(CLONE_NEWPID)) { } int pid = fork(); if (pid != 0) return wait_for_loop(pid); setup_common(); sandbox_common(); drop_caps(); if (unshare(CLONE_NEWNET)) { } loop(); exit(1); } 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 close_fds() { for (int fd = 3; fd < MAX_FDS; fd++) close(fd); } 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(); close_fds(); 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 < 5000) { continue; } kill_and_wait(pid, &status); break; } } } uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; res = syscall(__NR_socket, 0x1000000010ul, 0x80002ul, 0); if (res != -1) r[0] = res; res = syscall(__NR_socket, 0x10ul, 0x803ul, 0); if (res != -1) r[1] = res; *(uint64_t*)0x20000200 = 0; *(uint32_t*)0x20000208 = 0; *(uint64_t*)0x20000210 = 0x20000180; *(uint64_t*)0x20000180 = 0; *(uint64_t*)0x20000188 = 0; *(uint64_t*)0x20000218 = 1; *(uint64_t*)0x20000220 = 0; *(uint64_t*)0x20000228 = 0; *(uint32_t*)0x20000230 = 0; syscall(__NR_sendmsg, r[1], 0x20000200ul, 0ul); *(uint32_t*)0x200002c0 = 0x14; res = syscall(__NR_getsockname, r[1], 0x20000100ul, 0x200002c0ul); if (res != -1) r[2] = *(uint32_t*)0x20000104; *(uint64_t*)0x20000240 = 0; *(uint32_t*)0x20000248 = 0; *(uint64_t*)0x20000250 = 0x20000140; *(uint64_t*)0x20000140 = 0x200003c0; memcpy((void*)0x200003c0, "\x38\x00\x00\x00\x24\x00\x07\x05\x00\x00\x00\x40\x07\xa2\xa3\x00\x05" "\x00\x00\x00", 20); *(uint32_t*)0x200003d4 = r[2]; memcpy((void*)0x200003d8, "\x00\x00\x00\x00\xff\xff\xff\xff\x00\x00\x00\x00\x09\x00\x01\x00\x68" "\x66\x73\x63\x00\x00\x00\x00\x08\x00\x02", 27); *(uint64_t*)0x20000148 = 0x38; *(uint64_t*)0x20000258 = 1; *(uint64_t*)0x20000260 = 0; *(uint64_t*)0x20000268 = 0; *(uint32_t*)0x20000270 = 0; syscall(__NR_sendmsg, -1, 0x20000240ul, 0ul); *(uint64_t*)0x20000280 = 0; *(uint32_t*)0x20000288 = 0; *(uint64_t*)0x20000290 = 0x20000180; *(uint64_t*)0x20000180 = 0x20000400; *(uint32_t*)0x20000400 = 0x84; *(uint16_t*)0x20000404 = 0x2c; *(uint16_t*)0x20000406 = 0xd27; *(uint32_t*)0x20000408 = 0; *(uint32_t*)0x2000040c = 0; *(uint8_t*)0x20000410 = 0; *(uint8_t*)0x20000411 = 0; *(uint16_t*)0x20000412 = 0; *(uint32_t*)0x20000414 = r[2]; *(uint16_t*)0x20000418 = 0; *(uint16_t*)0x2000041a = 0; *(uint16_t*)0x2000041c = 0; *(uint16_t*)0x2000041e = 0; *(uint16_t*)0x20000420 = 0xe; *(uint16_t*)0x20000422 = 0; *(uint16_t*)0x20000424 = 8; *(uint16_t*)0x20000426 = 1; memcpy((void*)0x20000428, "bpf\000", 4); *(uint16_t*)0x2000042c = 0x58; *(uint16_t*)0x2000042e = 2; *(uint16_t*)0x20000430 = 6; *(uint16_t*)0x20000432 = 4; *(uint16_t*)0x20000434 = 1; *(uint16_t*)0x20000438 = 0xc; *(uint16_t*)0x2000043a = 5; *(uint16_t*)0x2000043c = 6; *(uint8_t*)0x2000043e = 0; *(uint8_t*)0x2000043f = 0; *(uint32_t*)0x20000440 = 0; *(uint16_t*)0x20000444 = 0x40; *(uint16_t*)0x20000446 = 2; *(uint16_t*)0x20000448 = 0x3c; *(uint16_t*)0x2000044a = 1; *(uint32_t*)0x2000044c = 0; *(uint32_t*)0x20000450 = 0; *(uint32_t*)0x20000454 = 0; *(uint32_t*)0x20000458 = 0; *(uint32_t*)0x2000045c = 0; *(uint8_t*)0x20000460 = 0; *(uint8_t*)0x20000461 = 0; *(uint16_t*)0x20000462 = 0; *(uint16_t*)0x20000464 = 0; *(uint16_t*)0x20000466 = 0; *(uint32_t*)0x20000468 = 0; *(uint8_t*)0x2000046c = 0; *(uint8_t*)0x2000046d = 0; *(uint16_t*)0x2000046e = 0; *(uint16_t*)0x20000470 = 0; *(uint16_t*)0x20000472 = 0; *(uint32_t*)0x20000474 = 0; *(uint32_t*)0x20000478 = 0; *(uint32_t*)0x2000047c = 0; *(uint32_t*)0x20000480 = 0; *(uint64_t*)0x20000188 = 0x84; *(uint64_t*)0x20000298 = 1; *(uint64_t*)0x200002a0 = 0; *(uint64_t*)0x200002a8 = 0; *(uint32_t*)0x200002b0 = 0; syscall(__NR_sendmsg, -1, 0x20000280ul, 0ul); syscall(__NR_sendmmsg, r[0], 0x20000200ul, 0x10efe10675dec16ul, 0ul); res = syscall(__NR_socket, 0x10ul, 0x80002ul, 0); if (res != -1) r[3] = res; *(uint64_t*)0x200001c0 = 0; *(uint32_t*)0x200001c8 = 0; *(uint64_t*)0x200001d0 = 0x20000000; *(uint64_t*)0x20000000 = 0x20000dc0; memcpy((void*)0x20000dc0, "\x34\x09\x00\x00\x30\x00\x19\x07\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x20\x09\x01\x00\x1c\x09\x01\x00\x0b\x00\x01\x00\x70\x6f" "\x6c\x69\x63\x65\x00\x00\xf0\x08\x02\x80\x3c\x00\x01\x00\x02", 49); *(uint64_t*)0x20000008 = 0x934; *(uint64_t*)0x200001d8 = 1; *(uint64_t*)0x200001e0 = 0; *(uint64_t*)0x200001e8 = 0; *(uint32_t*)0x200001f0 = 0; syscall(__NR_sendmsg, r[3], 0x200001c0ul, 0ul); } 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); do_sandbox_none(); return 0; }