// In main(), early unsetenv("DYLD_INSERT_LIBRARIES"); setenv("DYLD_LIBRARY_PATH", "", 1); Better: use posix_spawnattr_setflags with POSIX_SPAWN_CLOEXEC_DEFAULT and clear environment. At startup, enumerate loaded dylibs and exit if an unknown one appears. 7.6. Detect task_for_pid Abuse Monitor task_for_pid() calls using EndpointSecurity framework. 8. Code Example – Basic Protection #include <dlfcn.h> #include <stdlib.h> #include <mach-o/dyld.h> #include <stdio.h> #include <string.h> int is_dylib_blacklisted(const char *path) // Implement allowlist of known good paths if (strstr(path, "/malicious/")) return 1; return 0;
DYLD_INSERT_LIBRARIES=./mymalloc.dylib ./testprog Attach to a running process and call dlopen() remotely. Requires thread creation and function call in target. insert dylib
int main() anti_injection_check(); // ... rest of program Requires thread creation and function call in target
DYLD_INSERT_LIBRARIES=/path/to/my.dylib /path/to/target : dyld respects this environment variable unless restricted (see SIP, hardened runtime). if (env && strlen(env) >
void anti_injection_check() const char *env = getenv("DYLD_INSERT_LIBRARIES"); if (env && strlen(env) > 0) fprintf(stderr, "DYLD_INSERT_LIBRARIES detected: %s\n", env); exit(1);