// https://syzkaller.appspot.com/bug?id=e061e6cd46417ee6566dc249d8f982c0b5977a52 // 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 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); 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); } 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); } #define KMEMLEAK_FILE "/sys/kernel/debug/kmemleak" static void setup_leak() { if (!write_file(KMEMLEAK_FILE, "scan")) exit(1); sleep(5); if (!write_file(KMEMLEAK_FILE, "scan")) exit(1); if (!write_file(KMEMLEAK_FILE, "clear")) exit(1); } static void check_leaks(void) { int fd = open(KMEMLEAK_FILE, O_RDWR); if (fd == -1) exit(1); uint64_t start = current_time_ms(); if (write(fd, "scan", 4) != 4) exit(1); sleep(1); while (current_time_ms() - start < 4 * 1000) sleep(1); if (write(fd, "scan", 4) != 4) exit(1); static char buf[128 << 10]; ssize_t n = read(fd, buf, sizeof(buf) - 1); if (n < 0) exit(1); int nleaks = 0; if (n != 0) { sleep(1); if (write(fd, "scan", 4) != 4) exit(1); if (lseek(fd, 0, SEEK_SET) < 0) exit(1); n = read(fd, buf, sizeof(buf) - 1); if (n < 0) exit(1); buf[n] = 0; char* pos = buf; char* end = buf + n; while (pos < end) { char* next = strstr(pos + 1, "unreferenced object"); if (!next) next = end; char prev = *next; *next = 0; fprintf(stderr, "BUG: memory leak\n%s\n", pos); *next = prev; pos = next; nleaks++; } } if (write(fd, "clear", 5) != 5) exit(1); close(fd); if (nleaks) exit(1); } 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; } check_leaks(); } } uint64_t r[4] = {0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; res = syscall(__NR_socket, 0x10ul, 0x803ul, 0); if (res != -1) r[0] = res; *(uint64_t*)0x20000900 = 0; *(uint32_t*)0x20000908 = 0; *(uint64_t*)0x20000910 = 0x200008c0; *(uint64_t*)0x200008c0 = 0x20000880; *(uint32_t*)0x20000880 = 0x10; *(uint16_t*)0x20000884 = 0x3f2; *(uint16_t*)0x20000886 = 0; *(uint32_t*)0x20000888 = 0; *(uint32_t*)0x2000088c = 0; *(uint64_t*)0x200008c8 = 0x10; *(uint64_t*)0x20000918 = 1; *(uint64_t*)0x20000920 = 0; *(uint64_t*)0x20000928 = 0; *(uint32_t*)0x20000930 = 0; syscall(__NR_sendmsg, r[0], 0x20000900ul, 0ul); *(uint64_t*)0x20000280 = 0; *(uint32_t*)0x20000288 = 0; *(uint64_t*)0x20000290 = 0x20000180; *(uint64_t*)0x20000180 = 0; *(uint64_t*)0x20000188 = 0; *(uint64_t*)0x20000298 = 1; *(uint64_t*)0x200002a0 = 0; *(uint64_t*)0x200002a8 = 0; *(uint32_t*)0x200002b0 = 0; syscall(__NR_sendmsg, -1, 0x20000280ul, 0ul); *(uint32_t*)0x200002c0 = 0x14; res = syscall(__NR_getsockname, r[0], 0x200000c0ul, 0x200002c0ul); if (res != -1) r[1] = *(uint32_t*)0x200000c4; *(uint64_t*)0x20000240 = 0; *(uint32_t*)0x20000248 = 0; *(uint64_t*)0x20000250 = 0x20000140; *(uint64_t*)0x20000140 = 0x20000300; memcpy((void*)0x20000300, "\x38\x00\x00\x00\x24\x00\x07\x05\x00\x00\x00\x40\x13\xa2\xa3\x00\x05" "\x00\x00\x00", 20); *(uint32_t*)0x20000314 = r[1]; memcpy((void*)0x20000318, "\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*)0x20000200 = 0; *(uint32_t*)0x20000208 = 0; *(uint64_t*)0x20000210 = 0x20000180; *(uint64_t*)0x20000180 = 0x20000540; *(uint32_t*)0x20000540 = 0x44; *(uint16_t*)0x20000544 = 0x2c; *(uint16_t*)0x20000546 = 0xd27; *(uint32_t*)0x20000548 = 0; *(uint32_t*)0x2000054c = 0; *(uint8_t*)0x20000550 = 0; *(uint8_t*)0x20000551 = 0; *(uint16_t*)0x20000552 = 0; *(uint32_t*)0x20000554 = r[1]; *(uint16_t*)0x20000558 = 0; *(uint16_t*)0x2000055a = 0; *(uint16_t*)0x2000055c = 0; *(uint16_t*)0x2000055e = 0; *(uint16_t*)0x20000560 = 0xfff2; *(uint16_t*)0x20000562 = 5; *(uint16_t*)0x20000564 = 0xc; *(uint16_t*)0x20000566 = 1; memcpy((void*)0x20000568, "tcindex\000", 8); *(uint16_t*)0x20000570 = 0x14; *(uint16_t*)0x20000572 = 2; *(uint16_t*)0x20000574 = 8; *(uint16_t*)0x20000576 = 5; *(uint16_t*)0x20000578 = 0; *(uint16_t*)0x2000057a = 0x10; *(uint16_t*)0x2000057c = 6; *(uint16_t*)0x2000057e = 2; *(uint16_t*)0x20000580 = 0; *(uint64_t*)0x20000188 = 0x44; *(uint64_t*)0x20000218 = 1; *(uint64_t*)0x20000220 = 0; *(uint64_t*)0x20000228 = 0; *(uint32_t*)0x20000230 = 0; syscall(__NR_sendmsg, -1, 0x20000200ul, 0ul); res = syscall(__NR_socket, 0x1000000010ul, 0x80002ul, 0); if (res != -1) r[2] = res; syscall(__NR_sendmmsg, r[2], 0x20000200ul, 0x10efe10675dec16ul, 0ul); res = syscall(__NR_socket, 0x1000000010ul, 0x80002ul, 0); if (res != -1) r[3] = res; syscall(__NR_sendmmsg, r[3], 0x20000200ul, 0x4924924924926d3ul, 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); setup_leak(); do_sandbox_none(); return 0; }