// https://syzkaller.appspot.com/bug?id=bda19bf6b14e7fddccf28ac6f0205c7df6d8c32e // 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 #ifndef SYS___specialfd #define SYS___specialfd 577 #endif static void kill_and_wait(int pid, int* status) { kill(pid, SIGKILL); while (waitpid(-1, status, 0) != pid) { } } 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 void execute_one(void); #define WAIT_FLAGS 0 static void loop(void) { int iter = 0; for (;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { sleep_ms(10); if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0}; void execute_one(void) { intptr_t res = 0; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } memcpy((void*)0x20000040, "/dev/filemon\000", 13); res = syscall(SYS_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000040ul, /*flags=*/0ul, /*mode=*/0ul); if (res != -1) r[0] = res; *(uint32_t*)0x20000540 = -1; *(uint32_t*)0x20000544 = 0; res = syscall(SYS___specialfd, /*type=*/1ul, /*req=*/0x20000540ul, /*len=*/8ul); if (res != -1) r[1] = res; *(uint32_t*)0x20000000 = r[1]; syscall(SYS_ioctl, /*fd=*/r[0], /*cmd=*/0xc0045301ul, /*arg=*/0x20000000ul); res = syscall(SYS_setsid); if (res != -1) r[2] = res; *(uint32_t*)0x200002c0 = r[2]; syscall(SYS_ioctl, /*fd=*/r[0], /*cmd=*/0xc0045302ul, /*arg=*/0x200002c0ul); memcpy((void*)0x20000240, "./file0\000", 8); syscall(SYS_open, /*file=*/0x20000240ul, /*flags=O_SYNC|O_CREAT|FASYNC|O_RDWR|0x4000040000000000*/ 0x40000400000002c2ul, /*mode=*/0ul); memcpy((void*)0x20000840, "./file1\000", 8); syscall(SYS_open, /*file=*/0x20000840ul, /*flags=O_SYNC|O_CREAT|FASYNC|O_RDWR|0x4000040000000000*/ 0x40000400000002c2ul, /*mode=*/0ul); syscall(SYS_sendmsg, /*fd=*/-1, /*msg=*/0ul, /*f=MSG_DONTROUTE|MSG_OOB|0x10*/ 0x15ul); } int main(void) { syscall(SYS_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x1012ul, /*fd=*/-1, /*offset=*/0ul); const char* reason; (void)reason; loop(); return 0; }