// https://syzkaller.appspot.com/bug?id=5ab6a816d07903fd446681e9ec3f729a3ca79e0f // 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 #ifndef __NR_bpf #define __NR_bpf 321 #endif static 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; } #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 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 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(); 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; } } } uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; *(uint32_t*)0x20000340 = 2; *(uint32_t*)0x20000344 = 4; *(uint32_t*)0x20000348 = 8; *(uint32_t*)0x2000034c = 1; *(uint32_t*)0x20000350 = 0x80; *(uint32_t*)0x20000354 = -1; *(uint32_t*)0x20000358 = 0; memset((void*)0x2000035c, 0, 16); *(uint32_t*)0x2000036c = 0; *(uint32_t*)0x20000370 = -1; *(uint32_t*)0x20000374 = 0; *(uint32_t*)0x20000378 = 0; *(uint32_t*)0x2000037c = 0; *(uint64_t*)0x20000380 = 0; res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x20000340ul, /*size=*/0x48ul); if (res != -1) r[0] = res; *(uint32_t*)0x20000480 = r[0]; syscall(__NR_bpf, /*cmd=*/0x16ul, /*arg=*/0x20000480ul, /*size=*/4ul); *(uint32_t*)0x200004c0 = 0x11; *(uint32_t*)0x200004c4 = 0x18; *(uint64_t*)0x200004c8 = 0x200001c0; memcpy((void*)0x200001c0, "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xb7" "\x08\x00\x00\x00\x00\x00\x00\x7b\x8a\xf8\xff\x00\x00\x00\x00\xb7\x08" "\x00\x00\x00\x00\x00\x00\x7b\x8a\xf0\xff\x00\x00\x00\x00\xbf\xa1\x00" "\x00\x00\x00\x00\x00\x07\x01\x00\x00\xf8\xff\xff\xff\xbf\xa4\x00\x00" "\x00\x00\x00\x00\x07\x04\x00\x00\xf0\xff\xff\xff\xb7\x02\x00\x00\x00" "\x00\x00\x00\x18\x23\x00\x00", 92); *(uint32_t*)0x2000021c = r[0]; memcpy( (void*)0x20000220, "\x00\x00\x00\x00\x00\x00\x00\x00\xb7\x05\x00\x00\x00\x00\x00\x00\x85\x00" "\x00\x00\xa5\x00\x00\x00\x18\x01\x00\x00\x20\x20\x64\x05\x00\x00\x00\x00" "\x00\x20\x20\x20\x7b\x1a\xf8\xff\x00\x00\x00\x00\xbf\xa1\x00\x00\x00\x00" "\x00\x00\x07\x01\x00\x00\xf8\xff\xff\xff\xb7\x02\x00\x00\x08\x00\x00\x00" "\xb7\x03\x00\x00\x00\x00\x00\x00\xa5\x00\x00\x00\x08\x00\x00\x00\x95", 89); *(uint64_t*)0x200004d0 = 0x20000600; memcpy((void*)0x20000600, "GPL\000", 4); *(uint32_t*)0x200004d8 = 0; *(uint32_t*)0x200004dc = 0; *(uint64_t*)0x200004e0 = 0; *(uint32_t*)0x200004e8 = 0; *(uint32_t*)0x200004ec = 0; memset((void*)0x200004f0, 0, 16); *(uint32_t*)0x20000500 = 0; *(uint32_t*)0x20000504 = 0; *(uint32_t*)0x20000508 = 0; *(uint32_t*)0x2000050c = 0; *(uint64_t*)0x20000510 = 0; *(uint32_t*)0x20000518 = 0; *(uint32_t*)0x2000051c = 0; *(uint64_t*)0x20000520 = 0; *(uint32_t*)0x20000528 = 0; *(uint32_t*)0x2000052c = 0; *(uint32_t*)0x20000530 = 0; *(uint32_t*)0x20000534 = 0; *(uint64_t*)0x20000538 = 0; *(uint64_t*)0x20000540 = 0; *(uint32_t*)0x20000548 = 0; *(uint32_t*)0x2000054c = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200004c0ul, /*size=*/0x90ul); if (res != -1) r[1] = res; *(uint64_t*)0x200001c0 = 0x20000000; memcpy((void*)0x20000000, "kfree\000", 6); *(uint32_t*)0x200001c8 = r[1]; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200001c0ul, /*size=*/0x10ul); syscall(__NR_bpf, /*cmd=*/2ul, /*arg=*/0ul, /*size=*/0ul); syscall(__NR_sendmsg, /*fd=*/-1, /*msg=*/0ul, /*f=*/0ul); *(uint32_t*)0x200000c0 = 0x11; *(uint32_t*)0x200000c4 = 0xb; *(uint64_t*)0x200000c8 = 0x20000240; *(uint8_t*)0x20000240 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x20000241, 0, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000241, 0, 4, 4); *(uint16_t*)0x20000242 = 0; *(uint32_t*)0x20000244 = 0; *(uint8_t*)0x20000248 = 0; *(uint8_t*)0x20000249 = 0; *(uint16_t*)0x2000024a = 0; *(uint32_t*)0x2000024c = 0; *(uint8_t*)0x20000250 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x20000251, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000251, 0, 4, 4); *(uint16_t*)0x20000252 = 0; *(uint32_t*)0x20000254 = 0x25702020; *(uint8_t*)0x20000258 = 0; *(uint8_t*)0x20000259 = 0; *(uint16_t*)0x2000025a = 0; *(uint32_t*)0x2000025c = 0x20202000; STORE_BY_BITMASK(uint8_t, , 0x20000260, 3, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000260, 3, 3, 2); STORE_BY_BITMASK(uint8_t, , 0x20000260, 3, 5, 3); STORE_BY_BITMASK(uint8_t, , 0x20000261, 0xa, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000261, 1, 4, 4); *(uint16_t*)0x20000262 = 0xfff8; *(uint32_t*)0x20000264 = 0; STORE_BY_BITMASK(uint8_t, , 0x20000268, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000268, 1, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000268, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000269, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000269, 0xa, 4, 4); *(uint16_t*)0x2000026a = 0; *(uint32_t*)0x2000026c = 0; STORE_BY_BITMASK(uint8_t, , 0x20000270, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000270, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000270, 0, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000271, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000271, 0, 4, 4); *(uint16_t*)0x20000272 = 0; *(uint32_t*)0x20000274 = 0xfffffff8; STORE_BY_BITMASK(uint8_t, , 0x20000278, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000278, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000278, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000279, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000279, 0, 4, 4); *(uint16_t*)0x2000027a = 0; *(uint32_t*)0x2000027c = 8; STORE_BY_BITMASK(uint8_t, , 0x20000280, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000280, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000280, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000281, 3, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000281, 0, 4, 4); *(uint16_t*)0x20000282 = 0; *(uint32_t*)0x20000284 = 0; *(uint8_t*)0x20000288 = 0x85; *(uint8_t*)0x20000289 = 0; *(uint16_t*)0x2000028a = 0; *(uint32_t*)0x2000028c = 6; *(uint8_t*)0x20000290 = 0x95; *(uint8_t*)0x20000291 = 0; *(uint16_t*)0x20000292 = 0; *(uint32_t*)0x20000294 = 0; *(uint64_t*)0x200000d0 = 0x20000200; memcpy((void*)0x20000200, "GPL\000", 4); *(uint32_t*)0x200000d8 = 0; *(uint32_t*)0x200000dc = 0; *(uint64_t*)0x200000e0 = 0; *(uint32_t*)0x200000e8 = 0; *(uint32_t*)0x200000ec = 0; memset((void*)0x200000f0, 0, 16); *(uint32_t*)0x20000100 = 0; *(uint32_t*)0x20000104 = 0; *(uint32_t*)0x20000108 = -1; *(uint32_t*)0x2000010c = 0; *(uint64_t*)0x20000110 = 0; *(uint32_t*)0x20000118 = 0; *(uint32_t*)0x2000011c = 0; *(uint64_t*)0x20000120 = 0; *(uint32_t*)0x20000128 = 0; *(uint32_t*)0x2000012c = 0; *(uint32_t*)0x20000130 = 0; *(uint32_t*)0x20000134 = 0; *(uint64_t*)0x20000138 = 0; *(uint64_t*)0x20000140 = 0; *(uint32_t*)0x20000148 = 0; *(uint32_t*)0x2000014c = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x90ul); if (res != -1) r[2] = res; *(uint64_t*)0x200007c0 = 0x20000080; memcpy((void*)0x20000080, "sys_enter\000", 10); *(uint32_t*)0x200007c8 = r[2]; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200007c0ul, /*size=*/0x10ul); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); for (procid = 0; procid < 5; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }