diff --git a/capio-common/capio/constants.hpp b/capio-common/capio/constants.hpp
index decf5a190..23705f856 100644
--- a/capio-common/capio/constants.hpp
+++ b/capio-common/capio/constants.hpp
@@ -14,9 +14,9 @@ typedef unsigned long long int capio_off64_t;
 constexpr size_t CAPIO_DEFAULT_DIR_INITIAL_SIZE                 = 1024L * 1024 * 1024;
 constexpr off64_t CAPIO_DEFAULT_FILE_INITIAL_SIZE               = 1024L * 1024 * 1024 * 4;
 [[maybe_unused]] constexpr std::array CAPIO_DIR_FORBIDDEN_PATHS = {
-    std::string_view{"/proc/"}, std::string_view{"/sys/"}, std::string_view{"/boot/"},
-    std::string_view{"/dev/"},  std::string_view{"/var/"}, std::string_view{"/run/"},
-    std::string_view("/spack/")};
+    std::string_view{"/proc/"},  std::string_view{"/sys/"},    std::string_view{"/boot/"},
+    std::string_view{"/dev/"},   std::string_view{"/var/"},    std::string_view{"/run/"},
+    std::string_view("/spack/"), std::string_view{"/usr/bin/"}};
 
 // CAPIO default values for shared memory
 constexpr char CAPIO_DEFAULT_WORKFLOW_NAME[] = "CAPIO";
diff --git a/capio-common/capio/filesystem.hpp b/capio-common/capio/filesystem.hpp
index 8c28e0baa..f9513c9c4 100644
--- a/capio-common/capio/filesystem.hpp
+++ b/capio-common/capio/filesystem.hpp
@@ -73,7 +73,8 @@ inline bool is_capio_path(const std::filesystem::path &path_to_check) {
     START_LOG(capio_syscall(SYS_gettid), "call(path_to_check=%s)", path_to_check.c_str());
 
     // check if path_to_check begins with CAPIO_DIR
-    const auto res = is_prefix(get_capio_dir(), path_to_check);
+    const auto res =
+        is_prefix(get_capio_dir(), path_to_check) && !is_forbidden_path(path_to_check.string());
     LOG("is_capio_path:%s", res ? "yes" : "no");
     return res;
 }
diff --git a/capio-posix/handlers/access.hpp b/capio-posix/handlers/access.hpp
index 164ba6b31..33a312f4b 100644
--- a/capio-posix/handlers/access.hpp
+++ b/capio-posix/handlers/access.hpp
@@ -9,7 +9,7 @@ int access_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long a
     const std::string_view pathname(reinterpret_cast<const char *>(arg0));
     auto tid = static_cast<pid_t>(syscall_no_intercept(SYS_gettid));
     START_LOG(tid, "call()");
-    if (is_forbidden_path(pathname) || !is_capio_path(pathname)) {
+    if (!is_capio_path(pathname)) {
         LOG("Path %s is forbidden: skip", pathname.data());
         return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
     }
@@ -32,7 +32,7 @@ int faccessat_handler(long arg0, long arg1, long arg2, long arg3, long arg4, lon
     auto tid = static_cast<pid_t>(syscall_no_intercept(SYS_gettid));
     START_LOG(tid, "call()");
 
-    if (is_forbidden_path(pathname) || !is_capio_path(pathname)) {
+    if (!is_capio_path(pathname)) {
         LOG("Path %s is forbidden or is not a capio path: skip", pathname.data());
         return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
     }
diff --git a/capio-posix/handlers/chdir.hpp b/capio-posix/handlers/chdir.hpp
index cec94e812..52f542ed7 100644
--- a/capio-posix/handlers/chdir.hpp
+++ b/capio-posix/handlers/chdir.hpp
@@ -13,7 +13,7 @@ int chdir_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long ar
     START_LOG(tid, "call(path=%s)", pathname.data());
 
     syscall_no_intercept_flag = true;
-    if (is_forbidden_path(pathname) || !is_capio_path(pathname)) {
+    if (!is_capio_path(pathname)) {
         LOG("Path %s is forbidden: skip", pathname.data());
         syscall_no_intercept_flag = false;
         return CAPIO_POSIX_SYSCALL_SKIP;
diff --git a/capio-posix/handlers/dup.hpp b/capio-posix/handlers/dup.hpp
index 8ee1e1a45..17f1a371d 100644
--- a/capio-posix/handlers/dup.hpp
+++ b/capio-posix/handlers/dup.hpp
@@ -19,8 +19,7 @@ int dup_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long arg5
         }
         dup_capio_fd(tid, fd, res, false);
 
-        *result = res;
-        return CAPIO_POSIX_SYSCALL_SUCCESS;
+        return posix_return_value(res, result);
     }
     return CAPIO_POSIX_SYSCALL_SKIP;
 }
@@ -43,8 +42,8 @@ int dup2_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long arg
         if (fd != res) {
             dup_capio_fd(tid, fd, res, false);
         }
-        *result = res;
-        return CAPIO_POSIX_SYSCALL_SUCCESS;
+
+        return posix_return_value(res, result);
     }
     return CAPIO_POSIX_SYSCALL_SKIP;
 }
@@ -75,8 +74,7 @@ int dup3_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long arg
         bool is_cloexec = (flags & O_CLOEXEC) == O_CLOEXEC;
         dup_capio_fd(tid, fd, res, is_cloexec);
 
-        *result = res;
-        return CAPIO_POSIX_SYSCALL_SUCCESS;
+        return posix_return_value(res, result);
     }
     return CAPIO_POSIX_SYSCALL_SKIP;
 }
diff --git a/capio-posix/handlers/fork.hpp b/capio-posix/handlers/fork.hpp
index 0fbf1dbbf..e707c0994 100644
--- a/capio-posix/handlers/fork.hpp
+++ b/capio-posix/handlers/fork.hpp
@@ -14,14 +14,13 @@ int fork_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long arg
 
     if (pid == 0) {
         // child
-        auto child_tid = static_cast<pid_t>(syscall_no_intercept(SYS_gettid));
+        const auto child_tid = static_cast<pid_t>(syscall_no_intercept(SYS_gettid));
         init_process(child_tid);
         *result = 0;
-    } else {
-        *result = pid;
+        return posix_return_value(0, result);
     }
 
-    return CAPIO_POSIX_SYSCALL_SUCCESS;
+    return posix_return_value(pid, result);
 }
 
 #endif // SYS_fork
diff --git a/capio-posix/handlers/mkdir.hpp b/capio-posix/handlers/mkdir.hpp
index bd78c15c2..c7303f958 100644
--- a/capio-posix/handlers/mkdir.hpp
+++ b/capio-posix/handlers/mkdir.hpp
@@ -7,7 +7,7 @@
 inline off64_t capio_mkdirat(int dirfd, const std::string_view &pathname, mode_t mode, pid_t tid) {
     START_LOG(tid, "call(dirfd=%d, pathname=%s, mode=%o)", dirfd, pathname.data(), mode);
 
-    if (is_forbidden_path(pathname)) {
+    if (!is_capio_path(pathname)) {
         LOG("Path %s is forbidden: skip", pathname.data());
         return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
     }
diff --git a/capio-posix/handlers/open.hpp b/capio-posix/handlers/open.hpp
index 301231297..4038b1fe5 100644
--- a/capio-posix/handlers/open.hpp
+++ b/capio-posix/handlers/open.hpp
@@ -40,7 +40,7 @@ int creat_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long ar
     mode_t mode = static_cast<int>(arg2);
     START_LOG(tid, "call(path=%s, flags=%d, mode=%d)", pathname.data(), flags, mode);
 
-    if (is_forbidden_path(pathname)) {
+    if (!is_capio_path(pathname)) {
         LOG("Path %s is forbidden: skip", pathname.data());
         return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
     }
@@ -52,7 +52,12 @@ int creat_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long ar
         LOG("Create request sent");
     }
 
-    int fd = static_cast<int>(syscall_no_intercept(SYS_creat, arg0, arg1, arg2, arg3, arg4, arg5));
+    const int fd =
+        static_cast<int>(syscall_no_intercept(SYS_creat, arg0, arg1, arg2, arg3, arg4, arg5));
+
+    if (fd < 0) {
+        return CAPIO_POSIX_SYSCALL_ERRNO;
+    }
 
     LOG("fd=%d", fd);
 
@@ -61,8 +66,7 @@ int creat_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long ar
         add_capio_fd(tid, path, fd, 0, (flags & O_CLOEXEC) == O_CLOEXEC);
     }
 
-    *result = fd;
-    return CAPIO_POSIX_SYSCALL_SUCCESS;
+    return posix_return_value(fd, result);
 }
 #endif // SYS_creat
 
@@ -76,7 +80,7 @@ int open_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long arg
 
     std::string path = compute_abs_path(pathname.data(), -1);
 
-    if (is_forbidden_path(pathname) || !is_capio_path(path)) {
+    if (!is_capio_path(pathname)) {
         LOG("Path %s is not a capio path: skip", pathname.data());
         return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
     }
@@ -95,13 +99,15 @@ int open_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long arg
 
     const int fd =
         static_cast<int>(syscall_no_intercept(SYS_open, arg0, arg1, arg2, arg3, arg4, arg5));
+    if (fd < 0) {
+        return CAPIO_POSIX_SYSCALL_ERRNO;
+    }
 
     LOG("Adding capio path");
     add_capio_fd(tid, resolved_path, fd, 0, (flags & O_CLOEXEC) == O_CLOEXEC);
     LOG("fd=%d", fd);
 
-    *result = fd;
-    return CAPIO_POSIX_SYSCALL_SUCCESS;
+    return posix_return_value(fd, result);
 }
 #endif // SYS_open
 
@@ -116,7 +122,7 @@ int openat_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long a
               mode);
 
     std::string path = compute_abs_path(pathname.data(), dirfd);
-    if (is_forbidden_path(pathname) || !is_capio_path(path)) {
+    if (!is_capio_path(pathname)) {
         LOG("Path %s is not a capio path: skip", pathname.data());
         return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
     }
@@ -138,11 +144,14 @@ int openat_handler(long arg0, long arg1, long arg2, long arg3, long arg4, long a
         static_cast<int>(syscall_no_intercept(SYS_openat, arg0, arg1, arg2, arg3, arg4, arg5));
     LOG("fd=%d", fd);
 
+    if (fd < 0) {
+        return CAPIO_POSIX_SYSCALL_ERRNO;
+    }
+
     LOG("Adding resolved capio path (%s)", resolved_path.c_str());
     add_capio_fd(tid, resolved_path, fd, 0, (flags & O_CLOEXEC) == O_CLOEXEC);
 
-    *result = fd;
-    return CAPIO_POSIX_SYSCALL_SUCCESS;
+    return posix_return_value(fd, result);
 }
 #endif // SYS_openat
 
diff --git a/capio-posix/handlers/posix_readdir.hpp b/capio-posix/handlers/posix_readdir.hpp
index 8620b6d63..7f3168725 100644
--- a/capio-posix/handlers/posix_readdir.hpp
+++ b/capio-posix/handlers/posix_readdir.hpp
@@ -179,14 +179,6 @@ inline struct dirent64 *capio_internal_readdir(DIR *dirp, long pid) {
 DIR *opendir(const char *name) {
     START_LOG(capio_syscall(SYS_gettid), "call(path=%s)", name);
 
-    if (is_forbidden_path(name)) {
-        LOG("Path %s is forbidden: skip", name);
-        syscall_no_intercept_flag = true;
-        auto res                  = real_opendir(name);
-        syscall_no_intercept_flag = false;
-        return res;
-    }
-
     auto absolute_path = capio_absolute(name);
 
     LOG("Resolved absolute path = %s", absolute_path.c_str());
diff --git a/capio-posix/handlers/read.hpp b/capio-posix/handlers/read.hpp
index 65cdb2391..684d9f8da 100644
--- a/capio-posix/handlers/read.hpp
+++ b/capio-posix/handlers/read.hpp
@@ -19,14 +19,14 @@ inline off64_t capio_read_fs(int fd, size_t count, pid_t tid) {
 inline off64_t capio_read_mem(int fd, size_t count, void *buffer, long *result) {
     START_LOG(capio_syscall(SYS_gettid), "call(fd=%d, count=%ld)", fd, count);
     if (exists_capio_fd(fd)) {
-        auto computed_offset = get_capio_fd_offset(fd) + count;
+        const auto computed_offset = get_capio_fd_offset(fd) + count;
 
         LOG("Handling read on file %s up to byte %ld", get_capio_fd_path(fd).c_str(),
             computed_offset);
 
-        *result = read_request_cache_mem->read(fd, buffer, count);
-        LOG("Result of read is %lu", *result);
-        return CAPIO_POSIX_SYSCALL_SUCCESS;
+        const auto res = read_request_cache_mem->read(fd, buffer, count);
+        LOG("Result of read is %lu", res);
+        return posix_return_value(res, result);
     }
     return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
 }
diff --git a/capio-posix/handlers/stat.hpp b/capio-posix/handlers/stat.hpp
index 43264fb9e..a7f9028cb 100644
--- a/capio-posix/handlers/stat.hpp
+++ b/capio-posix/handlers/stat.hpp
@@ -21,7 +21,7 @@ inline int capio_fstat(int fd, struct stat *statbuf, pid_t tid) {
 inline int capio_lstat(const std::string_view &pathname, struct stat *statbuf, pid_t tid) {
     START_LOG(tid, "call(absolute_path=%s, statbuf=0x%08x)", pathname.data(), statbuf);
 
-    if (is_forbidden_path(pathname)) {
+    if (!is_capio_path(pathname)) {
         LOG("Path %s is forbidden: skip", pathname.data());
         return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
     }
@@ -36,7 +36,7 @@ inline int capio_lstat(const std::string_view &pathname, struct stat *statbuf, p
 inline int capio_lstat_wrapper(const std::string_view &pathname, struct stat *statbuf, pid_t tid) {
     START_LOG(tid, "call(path=%s, buf=0x%08x)", pathname.data(), statbuf);
 
-    if (is_forbidden_path(pathname)) {
+    if (!is_capio_path(pathname)) {
         LOG("Path %s is forbidden: skip", pathname.data());
         return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
     }
@@ -54,7 +54,7 @@ inline int capio_fstatat(int dirfd, const std::string_view &pathname, struct sta
     START_LOG(tid, "call(dirfd=%ld, pathname=%s, statbuf=0x%08x, flags=%X)", dirfd, pathname.data(),
               statbuf, flags);
 
-    if (is_forbidden_path(pathname)) {
+    if (!is_capio_path(pathname)) {
         LOG("Path %s is forbidden: skip", pathname.data());
         return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
     }
diff --git a/capio-posix/handlers/statx.hpp b/capio-posix/handlers/statx.hpp
index e931ef2db..ba7d5bc2c 100644
--- a/capio-posix/handlers/statx.hpp
+++ b/capio-posix/handlers/statx.hpp
@@ -10,16 +10,13 @@ inline int capio_statx(int dirfd, const std::string_view &pathname, int flags, i
     START_LOG(tid, "call(dirfd=%d, pathname=%s, flags=%d, mask=%d, statxbuf=0x%08x)", dirfd,
               pathname.data(), flags, mask, statxbuf);
 
-    if (is_forbidden_path(pathname)) {
+    if (!is_capio_path(pathname)) {
         LOG("Path %s is forbidden: skip", pathname.data());
         return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
     }
 
-    std::filesystem::path path(pathname);
+    consent_request_cache_fs->consent_request(pathname, tid, __FUNCTION__);
 
-    if (is_capio_path(path)) {
-        consent_request_cache_fs->consent_request(path, tid, __FUNCTION__);
-    }
     return CAPIO_POSIX_SYSCALL_REQUEST_SKIP;
 }
 
diff --git a/capio-posix/utils/cache/consent_request_cache.hpp b/capio-posix/utils/cache/consent_request_cache.hpp
index 4d0f7c49e..54a8d6c83 100644
--- a/capio-posix/utils/cache/consent_request_cache.hpp
+++ b/capio-posix/utils/cache/consent_request_cache.hpp
@@ -34,12 +34,18 @@ class ConsentRequestCache {
         START_LOG(capio_syscall(SYS_gettid), "call(path=%s, tid=%ld, source=%s)", path.c_str(), tid,
                   source_func.c_str());
 
+        const auto resolved_path = resolve_possible_symlink(path);
+
+        if (!is_capio_path(resolved_path)) {
+            LOG("PATH is forbidden. Skipping request!");
+            return;
+        }
+
         /**
          * If entry is not present in cache, then proceed to perform request. othrewise if present,
          * there is no need to perform request to server and can proceed
          */
-        if (const auto resolved_path = resolve_possible_symlink(path);
-            available_consent->find(resolved_path) == available_consent->end()) {
+        if (!available_consent->contains(resolved_path)) {
             LOG("File not present in cache. performing request");
             auto res = _consent_to_proceed_request(resolved_path, tid, source_func);
             LOG("Registering new file for consent to proceed");