| // WARNING in print_bfs_bug |
| // https://syzkaller.appspot.com/bug?id=a588183ac34c1437fc0785e8f220e88282e5a29f |
| // status:open |
| // autogenerated by syzkaller (https://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <dirent.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <sched.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/mount.h> |
| #include <sys/prctl.h> |
| #include <sys/resource.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include <linux/capability.h> |
| |
| 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 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); |
| setpgrp(); |
| 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 (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); |
| } |
| |
| 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); |
| 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 close_fds() |
| { |
| int fd; |
| for (fd = 3; fd < MAX_FDS; fd++) |
| close(fd); |
| } |
| |
| 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(); |
| 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 < 5 * 1000) |
| continue; |
| kill_and_wait(pid, &status); |
| break; |
| } |
| } |
| } |
| |
| uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; |
| |
| void execute_one(void) |
| { |
| intptr_t res = 0; |
| res = syscall(__NR_socket, 0x10ul, 3ul, 0ul); |
| if (res != -1) |
| r[0] = res; |
| res = syscall(__NR_socket, 0x10ul, 0x803ul, 0); |
| if (res != -1) |
| r[1] = res; |
| *(uint32_t*)0x20000200 = 0x14; |
| res = syscall(__NR_getsockname, r[1], 0x20000100ul, 0x20000200ul); |
| if (res != -1) |
| r[2] = *(uint32_t*)0x20000104; |
| *(uint64_t*)0x20000040 = 0; |
| *(uint32_t*)0x20000048 = 0; |
| *(uint64_t*)0x20000050 = 0x20000000; |
| *(uint64_t*)0x20000000 = 0x20000540; |
| memcpy((void*)0x20000540, "\x48\x00\x00\x00\x10\x00\x05\x07\x00\x00\x00\x00" |
| "\x00\x00\x00\x00\x00\x00\x00\x00", |
| 20); |
| *(uint32_t*)0x20000554 = r[2]; |
| memcpy((void*)0x20000558, |
| "\x00\x00\x00\x00\x00\x00\x00\x00\x28\x00\x12\x00\x0c\x00\x01\x00\x76" |
| "\x65\x74\x68\x00\x00\x00\x00\x18\x00\x02\x00\xfd\x00\x01\x00\x00\x00" |
| "\x00\x00\x23\xc0\x30\x65\x54\x36\x2d\xdd\xcb\x89\x2e\xf8\x05\x14\x04" |
| "\xbd\xe5\xbf\x29\x6e\x3c\x56\x6a\x03\xd7\x24\xf7\xea\xd1\xef\x33\xad" |
| "\xfd\xbe\x08\xb8\xc5\x23\x6b\x93\xb9\x79\x7b\x44\x09\xf6\xe3\x70\xd1" |
| "\x51\x5d\x2e\x1f\xa6\x32\x59\xe6\xd4\xbd\x05\x77\x29\x81", |
| 99); |
| *(uint32_t*)0x200005bb = 0; |
| memcpy( |
| (void*)0x200005bf, |
| "\x00\x00\x00\x79\xab\xd1\x93\x2a\x9e\xc8\xa3\xa6\x36\x73\xa3\x6d\x66\xb1" |
| "\x03\xe1\xfd\xbb\x46\x78\x73\x1c\x44\xd5\x77\x2a\x8b\x52\xf8\x81\x32\x61" |
| "\x3f\x2a\xb9\xfa\xa4\x8e\x75\xb0\x50\x8e\x23\x67\x01\x8d\xc4\x47\x9c\x67" |
| "\x57\xb0\xa5\x62\x21\x07\xe7\x80\xa5\x2d\x43\xa2\x22\xd4\xaa\x8f\xa0\xc3" |
| "\xe9\x61\xe2\x40\x1d\x5d\xbb\x22\x10\x7c\xe4\x58\x4d\x22\xa3\x5c\x2f\xf5" |
| "\xc7\x06\x97\x79\xf3\xa8\xe8\x88\xa8\xac\x94\x31\x2c\xdb\x43\xf7\x90\x7e" |
| "\xbf\xcf\x3d\xc4\xad\x1f\x5e\x75\x77\xc5\xc2\xc9\x14\x64\x39\xe6\x91\x0c" |
| "\x43\x7a\x82\x13\xe1\x77\xdf\xca\x08\xfb\x12\xf6\xc6\xa8\x34\x38\x21\xe5" |
| "\x3d\x1f\x0e\xf2\x45\x75\x79\x71\x41\xdd\x16\xb8\x06\x50\x42\x50\x00\x17" |
| "\xc0\xba\xb7\x26\x5b\xa1\x85\xfa\x61\x40\x41\x45\xc5\x00\xbe\x7e\x57\xf2" |
| "\xaf\x45\x57\x65\xc6\x75\xc7\x10\xda\x30\xfb\x91\x5a\xbb\xfc\xb8\xfe\x5e" |
| "\x5a\x54\xf9\x98\xae\xb8\xec\xb8\x69\x53\x7d\x7d\xdb\x52\x9a\x8d\x66\xa4" |
| "\x90\x55\x86\xc9\xdd\x0d\x81\xd4\x84\x1e\x2c\x90\xbd\x8f\xa2\xbf\x38\x02" |
| "\xbf\x96\x3e\xda\xae\x01\xeb\xd1\x25\x51\x0b\xbe\x75\xbe\xac\x07\x7a\xf7" |
| "\x73\xd5\xd2\xa3\x4b\x25\x6e\x83\x69\xf6\x8b\x0f\xca\xb8\x7c\x7e\xe0\x33" |
| "\x99\x7f\x53\xb6\x35\xb5\x9a\xc5\xaa\x14\x56\xd0\xb3\x5e\x1d\xd7\x34\x14" |
| "\x9d\xbc\xf5\x41\xd7\x44\x96\x2b\x2b\xd0\xec\xe4\xc2\x67\x76\x0c\x3a\x6d" |
| "\x4b\xce\x9b\x03\x00\x00\x00\xcf\xa7\x03\xa1\xa4\x8b\x59\x70\x0f\x8c\x90" |
| "\x2e\x46\xae\x26\xe6\xe3\x11\x85\xa1\x9c\x07\x95\x9e\xdc\xb6\xbf\xc8\x8c" |
| "\x9e\x6b\xc1\x24\x14\x75\x21\xf6\xeb\x32\x72\x31\xe3\x57\x85\x95\x13\x77" |
| "\xc4\x0b\x71\x3a\x4f\x68\x54\xb0\x2c\x42\x8b\xef\x06\x8f\x94\x94\xaa\x8f" |
| "\xc9\xf9\x9d\xdf\xf4\x0e\xf4\xfd\xc9\x36\x0e\xb1\xbc\x2a\x25\xac\x49\x1f" |
| "\x2b\xc9\xc7\xa2\x3f\xe5\x66\x21\x70\xfe\xb5\x5b\x39\x99\xb4\x5b\x8b\x80" |
| "\xa8\x43\x8d\xf1\x9e\x18\x3d\x85\x46\x91\xa1\xf2\xb3\x43\x52\xfe\xd5\x22" |
| "\xc4\x26\x5e\x4e\xce\x52\xf3\x5d\x35\x1a\x16\x76\x98\x2c\xe0\xf2\xeb\x2c" |
| "\x45\x4b\x9d\xf0\x4b\x97\x61\x79\x61\x1f\x1b\xe4\xde\xac\x0d\xd4\xc7\x9a" |
| "\x12\x2f\x3d\x33\xe5\x2b\xcc\xe3\x88\x08\x80\x98\x20\x09\x4c\x31\xaf\x5c" |
| "\xca\x2d\x79\xbf\x78\x3b\xb8\x75\x88\xd8\xc2\x1b\xad\x66\x3b\xbd\xe2\x64" |
| "\x4c\xab\x2b\x60\x5d\x0c\xa9\x1b\x5c\x24\x17\xab\x7c\x7b\xba\x51\x73\xb0" |
| "\xbf\xdd\xfd\x1d\x87\xce\x6d\x25\x7c\x05\x26\xfc\x05\x1a\xda\xf7\x83\xcb" |
| "\x44\xe5\xf0\x98\x99\x88\x6b\x26\xca\x74\x6f\x8d\x2b\x39\x2e\x08\x71\xbc" |
| "\xa6\xf1\xcb\x40\xc5\xac\x1b\xf5\xca\x80\xb9\x34\x42\x4d\xed\xdf\xb5\x47" |
| "\xd8\xf9\xa3\x8a\x25\xaa\x39\x75\x2c\xac\x86\x69\x86\xbb\x0f\xaa\xf0\x7f" |
| "\xfe\xec\xd2\x7b\xd7\x36\xfa\x1a\x05\x8e\xe5\xb1\x7a\xdb\xde\x60\x5e\xb5" |
| "\xf3\x64\x8b\x4e\xe0\x13\x64\x0d\x01\x8b\x42\xef\x6b", |
| 625); |
| *(uint64_t*)0x20000008 = 0x48; |
| *(uint64_t*)0x20000058 = 1; |
| *(uint64_t*)0x20000060 = 0; |
| *(uint64_t*)0x20000068 = 0; |
| *(uint32_t*)0x20000070 = 0; |
| syscall(__NR_sendmsg, r[0], 0x20000040ul, 0ul); |
| } |
| int main(void) |
| { |
| syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0); |
| for (procid = 0; procid < 6; procid++) { |
| if (fork() == 0) { |
| do_sandbox_none(); |
| } |
| } |
| sleep(1000000); |
| return 0; |
| } |