// https://syzkaller.appspot.com/bug?id=524be83fa28f8e505866554a99eebc187fda36bc // 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 #ifndef __NR_bpf #define __NR_bpf 321 #endif #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 setup_gadgetfs(); static void setup_binderfs(); static void setup_fusectl(); static void sandbox_common_mount_tmpfs(void) { write_file("/proc/sys/fs/mount-max", "100000"); if (mkdir("./syz-tmp", 0777)) exit(1); if (mount("", "./syz-tmp", "tmpfs", 0, NULL)) exit(1); if (mkdir("./syz-tmp/newroot", 0777)) exit(1); if (mkdir("./syz-tmp/newroot/dev", 0700)) exit(1); unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE; if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL)) exit(1); if (mkdir("./syz-tmp/newroot/proc", 0700)) exit(1); if (mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL)) exit(1); if (mkdir("./syz-tmp/newroot/selinux", 0700)) exit(1); const char* selinux_path = "./syz-tmp/newroot/selinux"; if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) { if (errno != ENOENT) exit(1); if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); } if (mkdir("./syz-tmp/newroot/sys", 0700)) exit(1); if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL)) exit(1); if (mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); if (mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); if (mount("/proc/sys/fs/binfmt_misc", "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); if (mkdir("./syz-tmp/newroot/syz-inputs", 0700)) exit(1); if (mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL, bind_mount_flags | MS_RDONLY, NULL) && errno != ENOENT) exit(1); if (mkdir("./syz-tmp/pivot", 0777)) exit(1); if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) { if (chdir("./syz-tmp")) exit(1); } else { if (chdir("/")) exit(1); if (umount2("./pivot", MNT_DETACH)) exit(1); } if (chroot("./newroot")) exit(1); if (chdir("/")) exit(1); setup_gadgetfs(); setup_binderfs(); setup_fusectl(); } static void setup_gadgetfs() { if (mkdir("/dev/gadgetfs", 0777)) { } if (mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL)) { } } static void setup_fusectl() { 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)) { } if (symlink("/dev/binderfs", "./binderfs")) { } } static void loop(); static void sandbox_common() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); if (getppid() == 1) exit(1); 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); sandbox_common(); drop_caps(); if (unshare(CLONE_NEWNET)) { } write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535"); sandbox_common_mount_tmpfs(); loop(); exit(1); } static const char* setup_usb() { if (chmod("/dev/raw-gadget", 0666)) return "failed to chmod /dev/raw-gadget"; return NULL; } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void loop(void) { intptr_t res = 0; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } *(uint32_t*)0x2000000002c0 = 0x1b; *(uint32_t*)0x2000000002c4 = 0; *(uint32_t*)0x2000000002c8 = 0; *(uint32_t*)0x2000000002cc = 0x8000; *(uint32_t*)0x2000000002d0 = 0; *(uint32_t*)0x2000000002d4 = -1; *(uint32_t*)0x2000000002d8 = 0; memset((void*)0x2000000002dc, 0, 16); *(uint32_t*)0x2000000002ec = 0; *(uint32_t*)0x2000000002f0 = -1; *(uint32_t*)0x2000000002f4 = 0; *(uint32_t*)0x2000000002f8 = 0; *(uint32_t*)0x2000000002fc = 0; *(uint64_t*)0x200000000300 = 0; *(uint32_t*)0x200000000308 = 0; *(uint32_t*)0x20000000030c = 0; res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x2000000002c0ul, /*size=*/0x48ul); if (res != -1) r[0] = res; *(uint32_t*)0x200000000380 = 0x1f; *(uint32_t*)0x200000000384 = 0xd; *(uint64_t*)0x200000000388 = 0x200000000100; *(uint8_t*)0x200000000100 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x200000000101, 0, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000101, 0, 4, 4); *(uint16_t*)0x200000000102 = 0; *(uint32_t*)0x200000000104 = 0xfffffffc; *(uint8_t*)0x200000000108 = 0; *(uint8_t*)0x200000000109 = 0; *(uint16_t*)0x20000000010a = 0; *(uint32_t*)0x20000000010c = 7; *(uint8_t*)0x200000000110 = 0x85; *(uint8_t*)0x200000000111 = 0; *(uint16_t*)0x200000000112 = 0; *(uint32_t*)0x200000000114 = 0x11; *(uint8_t*)0x200000000118 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x200000000119, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000119, 1, 4, 4); *(uint16_t*)0x20000000011a = 0; *(uint32_t*)0x20000000011c = r[0]; *(uint8_t*)0x200000000120 = 0; *(uint8_t*)0x200000000121 = 0; *(uint16_t*)0x200000000122 = 0; *(uint32_t*)0x200000000124 = 0; STORE_BY_BITMASK(uint8_t, , 0x200000000128, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200000000128, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200000000128, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000129, 8, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000129, 0, 4, 4); *(uint16_t*)0x20000000012a = 0; *(uint32_t*)0x20000000012c = 0x20000002; STORE_BY_BITMASK(uint8_t, , 0x200000000130, 3, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200000000130, 3, 3, 2); STORE_BY_BITMASK(uint8_t, , 0x200000000130, 3, 5, 3); STORE_BY_BITMASK(uint8_t, , 0x200000000131, 0xa, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000131, 8, 4, 4); *(uint16_t*)0x200000000132 = 0xfff8; *(uint32_t*)0x200000000134 = 0; STORE_BY_BITMASK(uint8_t, , 0x200000000138, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200000000138, 1, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200000000138, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000139, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000139, 0xa, 4, 4); *(uint16_t*)0x20000000013a = 0; *(uint32_t*)0x20000000013c = 0; STORE_BY_BITMASK(uint8_t, , 0x200000000140, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200000000140, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200000000140, 0, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000141, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000141, 0, 4, 4); *(uint16_t*)0x200000000142 = 0; *(uint32_t*)0x200000000144 = 0xfffffff8; STORE_BY_BITMASK(uint8_t, , 0x200000000148, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200000000148, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200000000148, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000149, 3, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000149, 0, 4, 4); *(uint16_t*)0x20000000014a = 0; *(uint32_t*)0x20000000014c = 8; STORE_BY_BITMASK(uint8_t, , 0x200000000150, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200000000150, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200000000150, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000151, 4, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200000000151, 0, 4, 4); *(uint16_t*)0x200000000152 = 0; *(uint32_t*)0x200000000154 = 1; *(uint8_t*)0x200000000158 = 0x85; *(uint8_t*)0x200000000159 = 0; *(uint16_t*)0x20000000015a = 0; *(uint32_t*)0x20000000015c = 0xa6; *(uint8_t*)0x200000000160 = 0x95; *(uint8_t*)0x200000000161 = 0; *(uint16_t*)0x200000000162 = 0; *(uint32_t*)0x200000000164 = 0; *(uint64_t*)0x200000000390 = 0x2000000000c0; memcpy((void*)0x2000000000c0, "GPL\000", 4); *(uint32_t*)0x200000000398 = 0; *(uint32_t*)0x20000000039c = 0; *(uint64_t*)0x2000000003a0 = 0; *(uint32_t*)0x2000000003a8 = 0; *(uint32_t*)0x2000000003ac = 0x34; memset((void*)0x2000000003b0, 0, 16); *(uint32_t*)0x2000000003c0 = 0; *(uint32_t*)0x2000000003c4 = 0; *(uint32_t*)0x2000000003c8 = -1; *(uint32_t*)0x2000000003cc = 8; *(uint64_t*)0x2000000003d0 = 0; *(uint32_t*)0x2000000003d8 = 0; *(uint32_t*)0x2000000003dc = 0x10; *(uint64_t*)0x2000000003e0 = 0; *(uint32_t*)0x2000000003e8 = 0; *(uint32_t*)0x2000000003ec = 0; *(uint32_t*)0x2000000003f0 = 0; *(uint32_t*)0x2000000003f4 = 0; *(uint64_t*)0x2000000003f8 = 0; *(uint64_t*)0x200000000400 = 0; *(uint32_t*)0x200000000408 = 0x10; *(uint32_t*)0x20000000040c = 0xfff; *(uint32_t*)0x200000000410 = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000000380ul, /*size=*/0x94ul); if (res != -1) r[1] = res; *(uint32_t*)0x200000000500 = r[1]; *(uint32_t*)0x200000000504 = 0; *(uint32_t*)0x200000000508 = 0; *(uint32_t*)0x20000000050c = 0; *(uint64_t*)0x200000000510 = 0; *(uint64_t*)0x200000000518 = 0; *(uint32_t*)0x200000000520 = 0; *(uint32_t*)0x200000000524 = 0; *(uint32_t*)0x200000000528 = 0; *(uint32_t*)0x20000000052c = 0; *(uint64_t*)0x200000000530 = 0; *(uint64_t*)0x200000000538 = 0; *(uint32_t*)0x200000000540 = 0; *(uint32_t*)0x200000000544 = 0; *(uint32_t*)0x200000000548 = 0; syscall(__NR_bpf, /*cmd=*/0xaul, /*arg=*/0x200000000500ul, /*size=*/0x48ul); } 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; if ((reason = setup_usb())) printf("the reproducer may not work as expected: USB injection setup " "failed: %s\n", reason); do_sandbox_none(); return 0; }