// https://syzkaller.appspot.com/bug?id=849fbea7e495a0b5a47c4a52c4ef620285fd730b // 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 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) { 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[1] = {0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; res = syscall(__NR_socket, 2ul, 1ul, 0ul); if (res != -1) r[0] = res; memcpy((void*)0x20000000, "raw\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000", 32); *(uint32_t*)0x20000020 = 2; *(uint32_t*)0x20000024 = 3; *(uint32_t*)0x20000028 = 0x368; *(uint32_t*)0x2000002c = 0; *(uint32_t*)0x20000030 = 0x1f8; *(uint32_t*)0x20000034 = 0x1f8; *(uint32_t*)0x20000038 = 0x1f8; *(uint32_t*)0x2000003c = 0; *(uint32_t*)0x20000040 = 0x2d0; *(uint32_t*)0x20000044 = 0x2d0; *(uint32_t*)0x20000048 = 0x2d0; *(uint32_t*)0x2000004c = 0x2d0; *(uint32_t*)0x20000050 = 0x2d0; *(uint32_t*)0x20000054 = 3; *(uint64_t*)0x20000058 = 0; *(uint8_t*)0x20000060 = 2; *(uint8_t*)0x20000061 = 0; *(uint8_t*)0x20000062 = 0; *(uint8_t*)0x20000063 = 0; *(uint8_t*)0x20000064 = 0; *(uint8_t*)0x20000065 = 0; *(uint8_t*)0x20000066 = 0; *(uint8_t*)0x20000067 = 0; *(uint8_t*)0x20000068 = 0; *(uint8_t*)0x20000069 = 0; *(uint8_t*)0x2000006a = 0; *(uint8_t*)0x2000006b = 0; *(uint8_t*)0x2000006c = 0; *(uint8_t*)0x2000006d = 0; *(uint8_t*)0x2000006e = 0; *(uint8_t*)0x2000006f = 0; *(uint8_t*)0x20000070 = 0; *(uint8_t*)0x20000071 = 0; *(uint8_t*)0x20000072 = 0; *(uint8_t*)0x20000073 = 0; *(uint8_t*)0x20000074 = 0; *(uint8_t*)0x20000075 = 0; *(uint8_t*)0x20000076 = 0; *(uint8_t*)0x20000077 = 0; *(uint8_t*)0x20000078 = 0; *(uint8_t*)0x20000079 = 0; *(uint8_t*)0x2000007a = 0; *(uint8_t*)0x2000007b = 0; *(uint8_t*)0x2000007c = 0; *(uint8_t*)0x2000007d = 0; *(uint8_t*)0x2000007e = 0; *(uint8_t*)0x2000007f = 0; *(uint8_t*)0x20000080 = 0; *(uint8_t*)0x20000081 = 0; *(uint8_t*)0x20000082 = 0; *(uint8_t*)0x20000083 = 0; *(uint8_t*)0x20000084 = 0; *(uint8_t*)0x20000085 = 0; *(uint8_t*)0x20000086 = 0; *(uint8_t*)0x20000087 = 0; *(uint8_t*)0x20000088 = 0; *(uint8_t*)0x20000089 = 0; *(uint8_t*)0x2000008a = 0; *(uint8_t*)0x2000008b = 0; *(uint8_t*)0x2000008c = 0; *(uint8_t*)0x2000008d = 0; *(uint8_t*)0x2000008e = 0; *(uint8_t*)0x2000008f = 0; *(uint8_t*)0x20000090 = 0; *(uint8_t*)0x20000091 = 0; *(uint8_t*)0x20000092 = 0; *(uint8_t*)0x20000093 = 0; *(uint8_t*)0x20000094 = 0; *(uint8_t*)0x20000095 = 0; *(uint8_t*)0x20000096 = 0; *(uint8_t*)0x20000097 = 0; *(uint8_t*)0x20000098 = 0; *(uint8_t*)0x20000099 = 0; *(uint8_t*)0x2000009a = 0; *(uint8_t*)0x2000009b = 0; *(uint8_t*)0x2000009c = 0; *(uint8_t*)0x2000009d = 0; *(uint8_t*)0x2000009e = 0; *(uint8_t*)0x2000009f = 0; *(uint8_t*)0x200000a0 = 0; *(uint8_t*)0x200000a1 = 0; *(uint8_t*)0x200000a2 = 0; *(uint8_t*)0x200000a3 = 0; *(uint8_t*)0x200000a4 = 0; *(uint8_t*)0x200000a5 = 0; *(uint8_t*)0x200000a6 = 0; *(uint8_t*)0x200000a7 = 0; *(uint8_t*)0x200000a8 = 0; *(uint8_t*)0x200000a9 = 0; *(uint8_t*)0x200000aa = 0; *(uint8_t*)0x200000ab = 0; *(uint8_t*)0x200000ac = 0; *(uint8_t*)0x200000ad = 0; *(uint8_t*)0x200000ae = 0; *(uint8_t*)0x200000af = 0; *(uint8_t*)0x200000b0 = 0; *(uint8_t*)0x200000b1 = 0; *(uint8_t*)0x200000b2 = 0; *(uint8_t*)0x200000b3 = 0; *(uint32_t*)0x200000b4 = 0; *(uint16_t*)0x200000b8 = 0x1c8; *(uint16_t*)0x200000ba = 0x1f8; *(uint32_t*)0x200000bc = 0; *(uint64_t*)0x200000c0 = 0; *(uint64_t*)0x200000c8 = 0; *(uint16_t*)0x200000d0 = 0x158; memcpy((void*)0x200000d2, "hashlimit\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000", 29); *(uint8_t*)0x200000ef = 3; memcpy((void*)0x200000f0, "veth0_to_" "hsr\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000", 255); *(uint64_t*)0x200001f0 = 8; *(uint64_t*)0x200001f8 = 0; *(uint32_t*)0x20000200 = 0x41; *(uint32_t*)0x20000204 = 0x6000000; *(uint32_t*)0x20000208 = 0; *(uint32_t*)0x2000020c = 5; *(uint32_t*)0x20000210 = 0x40; *(uint32_t*)0x20000214 = 7; *(uint8_t*)0x20000218 = 0; *(uint8_t*)0x20000219 = 0; *(uint64_t*)0x20000220 = 0; *(uint16_t*)0x20000228 = 0x30; memcpy((void*)0x2000022a, "SET\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000", 29); *(uint8_t*)0x20000247 = 2; *(uint16_t*)0x20000248 = 0; *(uint8_t*)0x2000024a = 0; *(uint8_t*)0x2000024b = 0; *(uint16_t*)0x2000024c = 0; *(uint8_t*)0x2000024e = 0xfe; *(uint8_t*)0x2000024f = 0; *(uint32_t*)0x20000250 = 0; *(uint32_t*)0x20000254 = 0; *(uint8_t*)0x20000258 = 0; *(uint8_t*)0x20000259 = 0; *(uint8_t*)0x2000025a = 0; *(uint8_t*)0x2000025b = 0; *(uint8_t*)0x2000025c = 0; *(uint8_t*)0x2000025d = 0; *(uint8_t*)0x2000025e = 0; *(uint8_t*)0x2000025f = 0; *(uint8_t*)0x20000260 = 0; *(uint8_t*)0x20000261 = 0; *(uint8_t*)0x20000262 = 0; *(uint8_t*)0x20000263 = 0; *(uint8_t*)0x20000264 = 0; *(uint8_t*)0x20000265 = 0; *(uint8_t*)0x20000266 = 0; *(uint8_t*)0x20000267 = 0; *(uint8_t*)0x20000268 = 0; *(uint8_t*)0x20000269 = 0; *(uint8_t*)0x2000026a = 0; *(uint8_t*)0x2000026b = 0; *(uint8_t*)0x2000026c = 0; *(uint8_t*)0x2000026d = 0; *(uint8_t*)0x2000026e = 0; *(uint8_t*)0x2000026f = 0; *(uint8_t*)0x20000270 = 0; *(uint8_t*)0x20000271 = 0; *(uint8_t*)0x20000272 = 0; *(uint8_t*)0x20000273 = 0; *(uint8_t*)0x20000274 = 0; *(uint8_t*)0x20000275 = 0; *(uint8_t*)0x20000276 = 0; *(uint8_t*)0x20000277 = 0; *(uint8_t*)0x20000278 = 0; *(uint8_t*)0x20000279 = 0; *(uint8_t*)0x2000027a = 0; *(uint8_t*)0x2000027b = 0; *(uint8_t*)0x2000027c = 0; *(uint8_t*)0x2000027d = 0; *(uint8_t*)0x2000027e = 0; *(uint8_t*)0x2000027f = 0; *(uint8_t*)0x20000280 = 0; *(uint8_t*)0x20000281 = 0; *(uint8_t*)0x20000282 = 0; *(uint8_t*)0x20000283 = 0; *(uint8_t*)0x20000284 = 0; *(uint8_t*)0x20000285 = 0; *(uint8_t*)0x20000286 = 0; *(uint8_t*)0x20000287 = 0; *(uint8_t*)0x20000288 = 0; *(uint8_t*)0x20000289 = 0; *(uint8_t*)0x2000028a = 0; *(uint8_t*)0x2000028b = 0; *(uint8_t*)0x2000028c = 0; *(uint8_t*)0x2000028d = 0; *(uint8_t*)0x2000028e = 0; *(uint8_t*)0x2000028f = 0; *(uint8_t*)0x20000290 = 0; *(uint8_t*)0x20000291 = 0; *(uint8_t*)0x20000292 = 0; *(uint8_t*)0x20000293 = 0; *(uint8_t*)0x20000294 = 0; *(uint8_t*)0x20000295 = 0; *(uint8_t*)0x20000296 = 0; *(uint8_t*)0x20000297 = 0; *(uint8_t*)0x20000298 = 0; *(uint8_t*)0x20000299 = 0; *(uint8_t*)0x2000029a = 0; *(uint8_t*)0x2000029b = 0; *(uint8_t*)0x2000029c = 0; *(uint8_t*)0x2000029d = 0; *(uint8_t*)0x2000029e = 0; *(uint8_t*)0x2000029f = 0; *(uint8_t*)0x200002a0 = 0; *(uint8_t*)0x200002a1 = 0; *(uint8_t*)0x200002a2 = 0; *(uint8_t*)0x200002a3 = 0; *(uint8_t*)0x200002a4 = 0; *(uint8_t*)0x200002a5 = 0; *(uint8_t*)0x200002a6 = 0; *(uint8_t*)0x200002a7 = 0; *(uint8_t*)0x200002a8 = 0; *(uint8_t*)0x200002a9 = 0; *(uint8_t*)0x200002aa = 0; *(uint8_t*)0x200002ab = 0; *(uint32_t*)0x200002ac = 0; *(uint16_t*)0x200002b0 = 0x98; *(uint16_t*)0x200002b2 = 0xd8; *(uint32_t*)0x200002b4 = 0; *(uint64_t*)0x200002b8 = 0; *(uint64_t*)0x200002c0 = 0; *(uint16_t*)0x200002c8 = 0x28; memcpy((void*)0x200002ca, "rpfilter\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000", 29); *(uint8_t*)0x200002e7 = 0; *(uint8_t*)0x200002e8 = 0; *(uint16_t*)0x200002f0 = 0x40; memcpy((void*)0x200002f2, "ERROR\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000" "\000", 29); *(uint8_t*)0x2000030f = 0; memcpy((void*)0x20000310, "\xda\xe7\xbb\xe9\x99\x8a\x26\x0a\x8f\x00\xa3\x0e" "\x54\xd3\x56\xde\x89\x11\xe0\x5d\x60\x7e\xd2\x18" "\x4b\x8a\x7d\x2f\x9d\x2e", 30); *(uint8_t*)0x20000330 = 0; *(uint8_t*)0x20000331 = 0; *(uint8_t*)0x20000332 = 0; *(uint8_t*)0x20000333 = 0; *(uint8_t*)0x20000334 = 0; *(uint8_t*)0x20000335 = 0; *(uint8_t*)0x20000336 = 0; *(uint8_t*)0x20000337 = 0; *(uint8_t*)0x20000338 = 0; *(uint8_t*)0x20000339 = 0; *(uint8_t*)0x2000033a = 0; *(uint8_t*)0x2000033b = 0; *(uint8_t*)0x2000033c = 0; *(uint8_t*)0x2000033d = 0; *(uint8_t*)0x2000033e = 0; *(uint8_t*)0x2000033f = 0; *(uint8_t*)0x20000340 = 0; *(uint8_t*)0x20000341 = 0; *(uint8_t*)0x20000342 = 0; *(uint8_t*)0x20000343 = 0; *(uint8_t*)0x20000344 = 0; *(uint8_t*)0x20000345 = 0; *(uint8_t*)0x20000346 = 0; *(uint8_t*)0x20000347 = 0; *(uint8_t*)0x20000348 = 0; *(uint8_t*)0x20000349 = 0; *(uint8_t*)0x2000034a = 0; *(uint8_t*)0x2000034b = 0; *(uint8_t*)0x2000034c = 0; *(uint8_t*)0x2000034d = 0; *(uint8_t*)0x2000034e = 0; *(uint8_t*)0x2000034f = 0; *(uint8_t*)0x20000350 = 0; *(uint8_t*)0x20000351 = 0; *(uint8_t*)0x20000352 = 0; *(uint8_t*)0x20000353 = 0; *(uint8_t*)0x20000354 = 0; *(uint8_t*)0x20000355 = 0; *(uint8_t*)0x20000356 = 0; *(uint8_t*)0x20000357 = 0; *(uint8_t*)0x20000358 = 0; *(uint8_t*)0x20000359 = 0; *(uint8_t*)0x2000035a = 0; *(uint8_t*)0x2000035b = 0; *(uint8_t*)0x2000035c = 0; *(uint8_t*)0x2000035d = 0; *(uint8_t*)0x2000035e = 0; *(uint8_t*)0x2000035f = 0; *(uint8_t*)0x20000360 = 0; *(uint8_t*)0x20000361 = 0; *(uint8_t*)0x20000362 = 0; *(uint8_t*)0x20000363 = 0; *(uint8_t*)0x20000364 = 0; *(uint8_t*)0x20000365 = 0; *(uint8_t*)0x20000366 = 0; *(uint8_t*)0x20000367 = 0; *(uint8_t*)0x20000368 = 0; *(uint8_t*)0x20000369 = 0; *(uint8_t*)0x2000036a = 0; *(uint8_t*)0x2000036b = 0; *(uint8_t*)0x2000036c = 0; *(uint8_t*)0x2000036d = 0; *(uint8_t*)0x2000036e = 0; *(uint8_t*)0x2000036f = 0; *(uint8_t*)0x20000370 = 0; *(uint8_t*)0x20000371 = 0; *(uint8_t*)0x20000372 = 0; *(uint8_t*)0x20000373 = 0; *(uint8_t*)0x20000374 = 0; *(uint8_t*)0x20000375 = 0; *(uint8_t*)0x20000376 = 0; *(uint8_t*)0x20000377 = 0; *(uint8_t*)0x20000378 = 0; *(uint8_t*)0x20000379 = 0; *(uint8_t*)0x2000037a = 0; *(uint8_t*)0x2000037b = 0; *(uint8_t*)0x2000037c = 0; *(uint8_t*)0x2000037d = 0; *(uint8_t*)0x2000037e = 0; *(uint8_t*)0x2000037f = 0; *(uint8_t*)0x20000380 = 0; *(uint8_t*)0x20000381 = 0; *(uint8_t*)0x20000382 = 0; *(uint8_t*)0x20000383 = 0; *(uint32_t*)0x20000384 = 0; *(uint16_t*)0x20000388 = 0x70; *(uint16_t*)0x2000038a = 0x98; *(uint32_t*)0x2000038c = 0; *(uint64_t*)0x20000390 = 0; *(uint64_t*)0x20000398 = 0; *(uint16_t*)0x200003a0 = 0x28; memcpy((void*)0x200003a2, "\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000\000\000\000\000\000\000\000" "\000\000\000\000\000", 29); *(uint8_t*)0x200003bf = 4; *(uint32_t*)0x200003c0 = 0xfffffffe; syscall(__NR_setsockopt, r[0], 0x4000000000000ul, 0x40ul, 0x20000000ul, 0x3c8ul); } 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; }