// https://syzkaller.appspot.com/bug?id=eba39b03f8e6809abff57f46ccc7516df6bcafc9 // 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 #include #include #include #ifndef __NR_bpf #define __NR_bpf 321 #endif static unsigned long long procid; 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 void use_temporary_dir(void) { char tmpdir_template[] = "./syzkaller.XXXXXX"; char* tmpdir = mkdtemp(tmpdir_template); if (!tmpdir) exit(1); if (chmod(tmpdir, 0777)) exit(1); if (chdir(tmpdir)) exit(1); } #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 int runcmdline(char* cmdline) { int ret = system(cmdline); if (ret) { } return ret; } #define MAX_FDS 30 static void mount_cgroups(const char* dir, const char** controllers, int count) { if (mkdir(dir, 0777)) { return; } char enabled[128] = {0}; int i = 0; for (; i < count; i++) { if (mount("none", dir, "cgroup", 0, controllers[i])) { continue; } umount(dir); strcat(enabled, ","); strcat(enabled, controllers[i]); } if (enabled[0] == 0) { if (rmdir(dir) && errno != EBUSY) exit(1); return; } if (mount("none", dir, "cgroup", 0, enabled + 1)) { if (rmdir(dir) && errno != EBUSY) exit(1); } if (chmod(dir, 0777)) { } } static void mount_cgroups2(const char** controllers, int count) { if (mkdir("/syzcgroup/unified", 0777)) { return; } if (mount("none", "/syzcgroup/unified", "cgroup2", 0, NULL)) { if (rmdir("/syzcgroup/unified") && errno != EBUSY) exit(1); return; } if (chmod("/syzcgroup/unified", 0777)) { } int control = open("/syzcgroup/unified/cgroup.subtree_control", O_WRONLY); if (control == -1) return; int i; for (i = 0; i < count; i++) if (write(control, controllers[i], strlen(controllers[i])) < 0) { } close(control); } static void setup_cgroups() { const char* unified_controllers[] = {"+cpu", "+io", "+pids"}; const char* net_controllers[] = {"net", "net_prio", "devices", "blkio", "freezer"}; const char* cpu_controllers[] = {"cpuset", "cpuacct", "hugetlb", "rlimit", "memory"}; if (mkdir("/syzcgroup", 0777)) { return; } mount_cgroups2(unified_controllers, sizeof(unified_controllers) / sizeof(unified_controllers[0])); mount_cgroups("/syzcgroup/net", net_controllers, sizeof(net_controllers) / sizeof(net_controllers[0])); mount_cgroups("/syzcgroup/cpu", cpu_controllers, sizeof(cpu_controllers) / sizeof(cpu_controllers[0])); write_file("/syzcgroup/cpu/cgroup.clone_children", "1"); write_file("/syzcgroup/cpu/cpuset.memory_pressure_enabled", "1"); } static void setup_cgroups_loop() { int pid = getpid(); char file[128]; char cgroupdir[64]; snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid); if (mkdir(cgroupdir, 0777)) { } snprintf(file, sizeof(file), "%s/pids.max", cgroupdir); write_file(file, "32"); snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir); write_file(file, "%d", pid); snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/cpu/syz%llu", procid); if (mkdir(cgroupdir, 0777)) { } snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir); write_file(file, "%d", pid); snprintf(file, sizeof(file), "%s/memory.soft_limit_in_bytes", cgroupdir); write_file(file, "%d", 299 << 20); snprintf(file, sizeof(file), "%s/memory.limit_in_bytes", cgroupdir); write_file(file, "%d", 300 << 20); snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/net/syz%llu", procid); if (mkdir(cgroupdir, 0777)) { } snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir); write_file(file, "%d", pid); } static void setup_cgroups_test() { char cgroupdir[64]; snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid); if (symlink(cgroupdir, "./cgroup")) { } snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/cpu/syz%llu", procid); if (symlink(cgroupdir, "./cgroup.cpu")) { } snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/net/syz%llu", procid); if (symlink(cgroupdir, "./cgroup.net")) { } } static void setup_common() { if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { } } static void setup_binderfs() { if (mkdir("/dev/binderfs", 0777)) { } if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) { } } 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 = 128 << 20; 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)) { } write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535"); setup_binderfs(); loop(); exit(1); } #define FS_IOC_SETFLAGS _IOW('f', 2, long) static void remove_dir(const char* dir) { int iter = 0; DIR* dp = 0; retry: while (umount2(dir, MNT_DETACH | UMOUNT_NOFOLLOW) == 0) { } dp = opendir(dir); if (dp == NULL) { if (errno == EMFILE) { exit(1); } exit(1); } struct dirent* ep = 0; while ((ep = readdir(dp))) { if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0) continue; char filename[FILENAME_MAX]; snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name); while (umount2(filename, MNT_DETACH | UMOUNT_NOFOLLOW) == 0) { } struct stat st; if (lstat(filename, &st)) exit(1); if (S_ISDIR(st.st_mode)) { remove_dir(filename); continue; } int i; for (i = 0;; i++) { if (unlink(filename) == 0) break; if (errno == EPERM) { int fd = open(filename, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) { } close(fd); continue; } } if (errno == EROFS) { break; } if (errno != EBUSY || i > 100) exit(1); if (umount2(filename, MNT_DETACH | UMOUNT_NOFOLLOW)) exit(1); } } closedir(dp); for (int i = 0;; i++) { if (rmdir(dir) == 0) break; if (i < 100) { if (errno == EPERM) { int fd = open(dir, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) { } close(fd); continue; } } if (errno == EROFS) { break; } if (errno == EBUSY) { if (umount2(dir, MNT_DETACH | UMOUNT_NOFOLLOW)) exit(1); continue; } if (errno == ENOTEMPTY) { if (iter < 100) { iter++; goto retry; } } } 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_loop() { setup_cgroups_loop(); } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); setup_cgroups_test(); write_file("/proc/self/oom_score_adj", "1000"); if (symlink("/dev/binderfs", "./binderfs")) { } } static void close_fds() { for (int fd = 3; fd < MAX_FDS; fd++) close(fd); } #define SWAP_FILE "./swap-file" #define SWAP_FILE_SIZE (128 * 1000 * 1000) static void setup_swap() { swapoff(SWAP_FILE); unlink(SWAP_FILE); int fd = open(SWAP_FILE, O_CREAT | O_WRONLY | O_CLOEXEC, 0600); if (fd == -1) { exit(1); return; } fallocate(fd, FALLOC_FL_ZERO_RANGE, 0, SWAP_FILE_SIZE); close(fd); char cmdline[64]; sprintf(cmdline, "mkswap %s", SWAP_FILE); if (runcmdline(cmdline)) { exit(1); return; } if (swapon(SWAP_FILE, SWAP_FLAG_PREFER) == 1) { exit(1); return; } } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { setup_loop(); int iter = 0; for (;; iter++) { char cwdbuf[32]; sprintf(cwdbuf, "./%d", iter); if (mkdir(cwdbuf, 0777)) exit(1); int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { if (chdir(cwdbuf)) exit(1); 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; } remove_dir(cwdbuf); } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; *(uint32_t*)0x200009c0 = 0xf; *(uint32_t*)0x200009c4 = 4; *(uint32_t*)0x200009c8 = 8; *(uint32_t*)0x200009cc = 8; *(uint32_t*)0x200009d0 = 0; *(uint32_t*)0x200009d4 = -1; *(uint32_t*)0x200009d8 = 0; memset((void*)0x200009dc, 0, 16); *(uint32_t*)0x200009ec = 0; *(uint32_t*)0x200009f0 = -1; *(uint32_t*)0x200009f4 = 0; *(uint32_t*)0x200009f8 = 0; *(uint32_t*)0x200009fc = 0; *(uint64_t*)0x20000a00 = 0; res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x200009c0ul, /*size=*/0x48ul); if (res != -1) r[0] = res; *(uint32_t*)0x200005c0 = 0x18; *(uint32_t*)0x200005c4 = 0xc; *(uint64_t*)0x200005c8 = 0x20000440; *(uint8_t*)0x20000440 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x20000441, 0, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000441, 0, 4, 4); *(uint16_t*)0x20000442 = 0; *(uint32_t*)0x20000444 = 0; *(uint8_t*)0x20000448 = 0; *(uint8_t*)0x20000449 = 0; *(uint16_t*)0x2000044a = 0; *(uint32_t*)0x2000044c = 0; *(uint8_t*)0x20000450 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x20000451, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000451, 1, 4, 4); *(uint16_t*)0x20000452 = 0; *(uint32_t*)0x20000454 = r[0]; *(uint8_t*)0x20000458 = 0; *(uint8_t*)0x20000459 = 0; *(uint16_t*)0x2000045a = 0; *(uint32_t*)0x2000045c = 0; STORE_BY_BITMASK(uint8_t, , 0x20000460, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000460, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000460, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000461, 8, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000461, 0, 4, 4); *(uint16_t*)0x20000462 = 0; *(uint32_t*)0x20000464 = 0; STORE_BY_BITMASK(uint8_t, , 0x20000468, 3, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000468, 3, 3, 2); STORE_BY_BITMASK(uint8_t, , 0x20000468, 3, 5, 3); STORE_BY_BITMASK(uint8_t, , 0x20000469, 0xa, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000469, 8, 4, 4); *(uint16_t*)0x2000046a = 0xfff8; *(uint32_t*)0x2000046c = 0; STORE_BY_BITMASK(uint8_t, , 0x20000470, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000470, 1, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000470, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000471, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000471, 0xa, 4, 4); *(uint16_t*)0x20000472 = 0; *(uint32_t*)0x20000474 = 0; STORE_BY_BITMASK(uint8_t, , 0x20000478, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000478, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000478, 0, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000479, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000479, 0, 4, 4); *(uint16_t*)0x2000047a = 0; *(uint32_t*)0x2000047c = 0xfffffff8; STORE_BY_BITMASK(uint8_t, , 0x20000480, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000480, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000480, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000481, 3, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000481, 0, 4, 4); *(uint16_t*)0x20000482 = 0; *(uint32_t*)0x20000484 = 8; STORE_BY_BITMASK(uint8_t, , 0x20000488, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000488, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000488, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000489, 4, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000489, 0, 4, 4); *(uint16_t*)0x2000048a = 0; *(uint32_t*)0x2000048c = 0; *(uint8_t*)0x20000490 = 0x85; *(uint8_t*)0x20000491 = 0; *(uint16_t*)0x20000492 = 0; *(uint32_t*)0x20000494 = 3; *(uint8_t*)0x20000498 = 0x95; *(uint8_t*)0x20000499 = 0; *(uint16_t*)0x2000049a = 0; *(uint32_t*)0x2000049c = 0; *(uint64_t*)0x200005d0 = 0x20000400; memcpy((void*)0x20000400, "syzkaller\000", 10); *(uint32_t*)0x200005d8 = 0; *(uint32_t*)0x200005dc = 0; *(uint64_t*)0x200005e0 = 0; *(uint32_t*)0x200005e8 = 0; *(uint32_t*)0x200005ec = 0; memset((void*)0x200005f0, 0, 16); *(uint32_t*)0x20000600 = 0; *(uint32_t*)0x20000604 = 0; *(uint32_t*)0x20000608 = -1; *(uint32_t*)0x2000060c = 0; *(uint64_t*)0x20000610 = 0; *(uint32_t*)0x20000618 = 0; *(uint32_t*)0x2000061c = 0; *(uint64_t*)0x20000620 = 0; *(uint32_t*)0x20000628 = 0; *(uint32_t*)0x2000062c = 0; *(uint32_t*)0x20000630 = 0; *(uint32_t*)0x20000634 = 0; *(uint64_t*)0x20000638 = 0; *(uint64_t*)0x20000640 = 0; *(uint32_t*)0x20000648 = 0; *(uint32_t*)0x2000064c = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200005c0ul, /*size=*/0x90ul); if (res != -1) r[1] = res; *(uint64_t*)0x200000c0 = 0x20000000; memcpy((void*)0x20000000, "kfree\000", 6); *(uint32_t*)0x200000c8 = r[1]; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200000c0ul, /*size=*/0x10ul); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); setup_cgroups(); setup_swap(); for (procid = 0; procid < 5; procid++) { if (fork() == 0) { use_temporary_dir(); do_sandbox_none(); } } sleep(1000000); return 0; }