// https://syzkaller.appspot.com/bug?id=1b4ffc3a5debcc305862eeb179d57104168553e6 // 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; } #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; } #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 (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)) { } 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); } 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 < 5 * 1000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0}; void execute_one(void) { intptr_t res = 0; res = syscall(__NR_socket, 0x10ul, 3ul, 0); if (res != -1) r[0] = res; res = syscall(__NR_socket, 0x10ul, 0x803ul, 0); if (res != -1) r[1] = res; *(uint64_t*)0x200001c0 = 0; *(uint32_t*)0x200001c8 = 0; *(uint64_t*)0x200001d0 = 0x20000180; *(uint64_t*)0x20000180 = 0; *(uint64_t*)0x20000188 = 0; *(uint64_t*)0x200001d8 = 1; *(uint64_t*)0x200001e0 = 0; *(uint64_t*)0x200001e8 = 0; *(uint32_t*)0x200001f0 = 0; syscall(__NR_sendmsg, r[1], 0x200001c0ul, 0ul); *(uint32_t*)0x20000200 = 0x14; res = syscall(__NR_getsockname, r[1], 0x200002c0ul, 0x20000200ul); if (res != -1) r[2] = *(uint32_t*)0x200002c4; *(uint64_t*)0x20000040 = 0; *(uint32_t*)0x20000048 = 0; *(uint64_t*)0x20000050 = 0x20000100; *(uint64_t*)0x20000100 = 0x20000900; *(uint32_t*)0x20000900 = 0x40c; *(uint16_t*)0x20000904 = 0x24; *(uint16_t*)0x20000906 = 0xf1d; *(uint32_t*)0x20000908 = 0; *(uint32_t*)0x2000090c = 0; *(uint8_t*)0x20000910 = 0; *(uint8_t*)0x20000911 = 0; *(uint16_t*)0x20000912 = 0; *(uint32_t*)0x20000914 = r[2]; *(uint16_t*)0x20000918 = 0; *(uint16_t*)0x2000091a = 0; *(uint16_t*)0x2000091c = 0xfff1; *(uint16_t*)0x2000091e = -1; *(uint16_t*)0x20000920 = 0; *(uint16_t*)0x20000922 = 0; *(uint16_t*)0x20000924 = 0xa; *(uint16_t*)0x20000926 = 1; memcpy((void*)0x20000928, "choke\000", 6); *(uint16_t*)0x20000930 = 0x25c; *(uint16_t*)0x20000932 = 2; *(uint16_t*)0x20000934 = 0x104; *(uint16_t*)0x20000936 = 2; memcpy((void*)0x20000938, "\x28\xa6\xb2\x9f\x28\x98\x28\xfe\x5b\x75\x59\x80\xf4\x31\xca\x66\xc9" "\xca\x56\x49\x33\x7d\xf6\x9e\x63\xa7\xa5\x91\x03\x25\x69\x66\xe2\x70" "\x52\xd2\xc8\x29\xb5\x7f\x22\xe2\xa1\x61\x62\xd1\x1f\x16\xe7\x5d\xcc" "\x00\x20\x9b\xcb\x3d\x4b\x1e\x3e\xf0\xd5\x4a\xfc\x5a\x7f\x37\x2b\xdb" "\xd8\xee\xd9\xd5\xa0\x46\x2c\x4f\x3e\x7f\x4f\xa4\x87\xc1\xc2\x83\xd5" "\x3f\x74\xbf\xcc\x25\xdc\xc4\x86\x5a\x54\x3f\x80\xd9\x34\xdb\x10\xbc" "\x75\xa2\x81\xf8\x2c\x41\xbe\x27\x48\x5c\x8e\xbd\x24\x79\x51\x9f\xe7" "\xcd\xe5\x40\xe5\xae\x0b\x12\x4c\x8d\x4a\xb1\x2c\x41\xe9\x36\x0c\xfa" "\xdb\x17\x3d\x6b\xf1\x80\xe0\x7f\xdf\x85\x58\x21\x60\x6f\x36\xa2\x4d" "\xe3\xe5\xd7\x77\xf6\x2f\x9c\x1e\x0b\x02\x7e\xb0\xf1\x47\x22\xee\xc7" "\x49\x47\xdd\x14\x86\x16\x9d\xf1\x36\x1d\x59\x68\x36\xa7\xcf\x0c\x72" "\xe9\xe0\xdd\xf4\xd3\xc2\xe4\x3a\xba\xf1\xc1\x81\x43\x56\x53\xfc\x19" "\x53\xd4\x54\x84\x50\x87\xbf\xbb\x29\x54\xdd\x8c\x29\xc9\xf2\x88\x5f" "\x7a\xb9\xb7\x68\xdd\x47\x52\x26\xe4\x8e\x73\x47\x90\xef\xae\xbf\x6e" "\x26\xc3\xd9\xfc\xcb\x73\x88\xb6\x7c\xf4\xb3\x9b\x19\xf5\xcf\x2f\x4a" "\x76", 256); *(uint16_t*)0x20000a38 = 0x104; *(uint16_t*)0x20000a3a = 2; memcpy((void*)0x20000a3c, "\xa4\xa9\x18\x95\x57\x3e\xa1\x28\x26\xdb\xf2\xe4\xfb\x3c\xac\xa6\x03" "\xf0\x7d\xe3\x71\xe4\x4d\x63\x2e\x8c\xb6\xf4\x78\xd4\x4e\x4d\xfb\xb5" "\xbb\x19\xed\x2e\xcc\x6b\x48\xc6\xfa\x24\xdc\x79\xb7\x6d\x26\x39\xd6" "\x2a\xe8\x8f\x2d\x18\xf7\x93\x19\xf7\x9f\x61\xb6\x01\x4d\xc3\x78\x5d" "\xae\xff\x92\xe4\x98\x07\x7f\x8c\x08\x75\x04\xfe\x84\x8e\x30\x65\xf3" "\x6d\x1b\x0d\x68\x85\x5f\x86\x86\x2e\x31\x74\xdd\x1c\x6a\x95\x29\x42" "\x04\x87\x81\x0a\xff\x8b\xd3\x03\x01\x0d\xcc\x03\x67\x24\x75\xb8\xd5" "\x9a\x72\x75\x8e\x67\x56\x21\xde\xd1\x2d\xb1\x54\xe7\x2f\xc4\xf7\x72" "\x5b\xdb\xab\x09\x1e\xed\x9b\x3c\xce\x18\x11\x59\xe0\xcf\x48\x8f\x6d" "\x07\x92\x8d\x6e\x82\xea\x31\x62\x97\x61\xc6\x94\xe2\xca\x30\x1b\x1b" "\x16\x01\x82\x3c\x97\xa1\x54\xcd\x92\xca\x84\x8e\x40\xeb\x92\x05\x21" "\x0f\x80\x42\x10\x9f\xa3\x8c\x7b\x6c\x11\xce\x61\x36\x66\x12\x18\x22" "\xda\xbd\x72\xf3\x42\x68\x90\x60\xf1\x7b\xb6\x22\x30\x6b\x99\xd3\xb5" "\x29\x26\xca\x86\x2b\x3e\x6f\x53\x4f\xa2\x3c\xe8\x06\x86\x8e\x7d\x9e" "\x53\x47\x00\xd9\x5c\x37\x75\xa6\x5d\x97\xeb\x21\x13\xe2\xa2\xdd\x6c" "\x40", 256); *(uint16_t*)0x20000b3c = 0x14; *(uint16_t*)0x20000b3e = 1; *(uint32_t*)0x20000b40 = 0x68; *(uint32_t*)0x20000b44 = 2; *(uint32_t*)0x20000b48 = 4; *(uint8_t*)0x20000b4c = 9; *(uint8_t*)0x20000b4d = 0x12; *(uint8_t*)0x20000b4e = 0x16; *(uint8_t*)0x20000b4f = 2; *(uint16_t*)0x20000b50 = 0x14; *(uint16_t*)0x20000b52 = 1; *(uint32_t*)0x20000b54 = 2; *(uint32_t*)0x20000b58 = 8; *(uint32_t*)0x20000b5c = 0x20000000; *(uint8_t*)0x20000b60 = 2; *(uint8_t*)0x20000b61 = 0; *(uint8_t*)0x20000b62 = 0x1d; *(uint8_t*)0x20000b63 = 1; *(uint16_t*)0x20000b64 = 0x14; *(uint16_t*)0x20000b66 = 1; *(uint32_t*)0x20000b68 = 0xba; *(uint32_t*)0x20000b6c = 1; *(uint32_t*)0x20000b70 = 0; *(uint8_t*)0x20000b74 = 0x1c; *(uint8_t*)0x20000b75 = 0x20; *(uint8_t*)0x20000b76 = 0x1e; *(uint8_t*)0x20000b77 = 0; *(uint16_t*)0x20000b78 = 0x14; *(uint16_t*)0x20000b7a = 1; *(uint32_t*)0x20000b7c = 8; *(uint32_t*)0x20000b80 = 7; *(uint32_t*)0x20000b84 = 9; *(uint8_t*)0x20000b88 = 0x40; *(uint8_t*)0x20000b89 = 0x13; *(uint8_t*)0x20000b8a = 1; *(uint8_t*)0x20000b8b = 6; *(uint16_t*)0x20000b8c = 0xd4; STORE_BY_BITMASK(uint16_t, , 0x20000b8e, 8, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x20000b8f, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x20000b8f, 1, 7, 1); *(uint16_t*)0x20000b90 = 0x1c; *(uint16_t*)0x20000b92 = 1; *(uint8_t*)0x20000b94 = 1; *(uint8_t*)0x20000b95 = 3; *(uint16_t*)0x20000b96 = 7; *(uint32_t*)0x20000b98 = 3; *(uint32_t*)0x20000b9c = 2; *(uint32_t*)0x20000ba0 = 5; *(uint32_t*)0x20000ba4 = 5; *(uint32_t*)0x20000ba8 = 2; *(uint16_t*)0x20000bac = 8; *(uint16_t*)0x20000bae = 2; *(uint16_t*)0x20000bb0 = 0x101; *(uint16_t*)0x20000bb2 = 0x3f; *(uint16_t*)0x20000bb4 = 0x1c; *(uint16_t*)0x20000bb6 = 1; *(uint8_t*)0x20000bb8 = 0; *(uint8_t*)0x20000bb9 = 0xb9; *(uint16_t*)0x20000bba = 5; *(uint32_t*)0x20000bbc = 5; *(uint32_t*)0x20000bc0 = 2; *(uint32_t*)0x20000bc4 = 0x10001; *(uint32_t*)0x20000bc8 = 0x8000; *(uint32_t*)0x20000bcc = 6; *(uint16_t*)0x20000bd0 = 0x10; *(uint16_t*)0x20000bd2 = 2; *(uint16_t*)0x20000bd4 = 3; *(uint16_t*)0x20000bd6 = 0xe9c; *(uint16_t*)0x20000bd8 = 0x7fff; *(uint16_t*)0x20000bda = 3; *(uint16_t*)0x20000bdc = 0xfffd; *(uint16_t*)0x20000bde = 0xfff7; *(uint16_t*)0x20000be0 = 0x1c; *(uint16_t*)0x20000be2 = 1; *(uint8_t*)0x20000be4 = 6; *(uint8_t*)0x20000be5 = 0x80; *(uint16_t*)0x20000be6 = 0x8001; *(uint32_t*)0x20000be8 = 3; *(uint32_t*)0x20000bec = 2; *(uint32_t*)0x20000bf0 = 5; *(uint32_t*)0x20000bf4 = 0xffff; *(uint32_t*)0x20000bf8 = 7; *(uint16_t*)0x20000bfc = 0x12; *(uint16_t*)0x20000bfe = 2; *(uint16_t*)0x20000c00 = 2; *(uint16_t*)0x20000c02 = 0x40; *(uint16_t*)0x20000c04 = 0; *(uint16_t*)0x20000c06 = 6; *(uint16_t*)0x20000c08 = 8; *(uint16_t*)0x20000c0a = 6; *(uint16_t*)0x20000c0c = 4; *(uint16_t*)0x20000c10 = 0x1c; *(uint16_t*)0x20000c12 = 1; *(uint8_t*)0x20000c14 = 3; *(uint8_t*)0x20000c15 = 4; *(uint16_t*)0x20000c16 = 4; *(uint32_t*)0x20000c18 = 0xffff; *(uint32_t*)0x20000c1c = 1; *(uint32_t*)0x20000c20 = 7; *(uint32_t*)0x20000c24 = 0x3f; *(uint32_t*)0x20000c28 = 3; *(uint16_t*)0x20000c2c = 0xa; *(uint16_t*)0x20000c2e = 2; *(uint16_t*)0x20000c30 = 0x80; *(uint16_t*)0x20000c32 = 0xfff; *(uint16_t*)0x20000c34 = 4; *(uint16_t*)0x20000c38 = 0x1c; *(uint16_t*)0x20000c3a = 1; *(uint8_t*)0x20000c3c = 6; *(uint8_t*)0x20000c3d = 7; *(uint16_t*)0x20000c3e = 1; *(uint32_t*)0x20000c40 = 0xffff0001; *(uint32_t*)0x20000c44 = 2; *(uint32_t*)0x20000c48 = 9; *(uint32_t*)0x20000c4c = 0x800; *(uint32_t*)0x20000c50 = 3; *(uint16_t*)0x20000c54 = 0xa; *(uint16_t*)0x20000c56 = 2; *(uint16_t*)0x20000c58 = 0x401; *(uint16_t*)0x20000c5a = 0xfffc; *(uint16_t*)0x20000c5c = 0; *(uint16_t*)0x20000c60 = 0x54; STORE_BY_BITMASK(uint16_t, , 0x20000c62, 8, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x20000c63, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x20000c63, 1, 7, 1); *(uint16_t*)0x20000c64 = 0x1c; *(uint16_t*)0x20000c66 = 1; *(uint8_t*)0x20000c68 = 8; *(uint8_t*)0x20000c69 = 2; *(uint16_t*)0x20000c6a = 3; *(uint32_t*)0x20000c6c = 0xfaf; *(uint32_t*)0x20000c70 = 2; *(uint32_t*)0x20000c74 = 0xff; *(uint32_t*)0x20000c78 = 1; *(uint32_t*)0x20000c7c = 3; *(uint16_t*)0x20000c80 = 0xa; *(uint16_t*)0x20000c82 = 2; *(uint16_t*)0x20000c84 = 7; *(uint16_t*)0x20000c86 = 0x3ff; *(uint16_t*)0x20000c88 = 9; *(uint16_t*)0x20000c8c = 0x1c; *(uint16_t*)0x20000c8e = 1; *(uint8_t*)0x20000c90 = 0xdc; *(uint8_t*)0x20000c91 = 0x14; *(uint16_t*)0x20000c92 = 0x1608; *(uint32_t*)0x20000c94 = 0x7ff; *(uint32_t*)0x20000c98 = 0; *(uint32_t*)0x20000c9c = 3; *(uint32_t*)0x20000ca0 = 0x209; *(uint32_t*)0x20000ca4 = 3; *(uint16_t*)0x20000ca8 = 0xa; *(uint16_t*)0x20000caa = 2; *(uint16_t*)0x20000cac = 9; *(uint16_t*)0x20000cae = 0x80; *(uint16_t*)0x20000cb0 = 0xfff9; *(uint16_t*)0x20000cb4 = 0xb; *(uint16_t*)0x20000cb6 = 1; memcpy((void*)0x20000cb8, "clsact\000", 7); *(uint16_t*)0x20000cc0 = 8; *(uint16_t*)0x20000cc2 = 0xd; *(uint32_t*)0x20000cc4 = 4; *(uint16_t*)0x20000cc8 = 8; *(uint16_t*)0x20000cca = 0xe; *(uint32_t*)0x20000ccc = 0x20; *(uint16_t*)0x20000cd0 = 6; *(uint16_t*)0x20000cd2 = 5; *(uint8_t*)0x20000cd4 = 0; *(uint8_t*)0x20000cd5 = 0x1f; *(uint16_t*)0x20000cd8 = 0x34; STORE_BY_BITMASK(uint16_t, , 0x20000cda, 8, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x20000cdb, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x20000cdb, 1, 7, 1); *(uint16_t*)0x20000cdc = 0x1c; *(uint16_t*)0x20000cde = 1; *(uint8_t*)0x20000ce0 = 0; *(uint8_t*)0x20000ce1 = 0x80; *(uint16_t*)0x20000ce2 = 0x72; *(uint32_t*)0x20000ce4 = 0xa96; *(uint32_t*)0x20000ce8 = 0; *(uint32_t*)0x20000cec = 5; *(uint32_t*)0x20000cf0 = 0; *(uint32_t*)0x20000cf4 = 7; *(uint16_t*)0x20000cf8 = 0x12; *(uint16_t*)0x20000cfa = 2; *(uint16_t*)0x20000cfc = 0x7ff; *(uint16_t*)0x20000cfe = 7; *(uint16_t*)0x20000d00 = 0x1ff; *(uint16_t*)0x20000d02 = 7; *(uint16_t*)0x20000d04 = 7; *(uint16_t*)0x20000d06 = 4; *(uint16_t*)0x20000d08 = 0xbd; *(uint64_t*)0x20000108 = 0x40c; *(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, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); do_sandbox_none(); return 0; }