diff --git a/NEWS b/NEWS
index 098f8b884f3..0c52b19d996 100644
--- a/NEWS
+++ b/NEWS
@@ -37,6 +37,9 @@ PHP                                                                        NEWS
 - POSIX:
   . posix_kill and posix_setpgid throws a ValueError on invalid process_id.
     (David Carlier)
+  . posix_setpgid throws a ValueError on invalid process_group_id,
+    posix_setrlimit throws a ValueError on invalid soft_limit and hard_limit
+    arguments. (David Carlier)
 
 - Reflection:
   . Fixed bug GH-19187 (ReflectionNamedType::getName() prints nullable type when
diff --git a/UPGRADING b/UPGRADING
index 381fec6ba2e..e21eda5439a 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -384,8 +384,11 @@ PHP 8.5 UPGRADE NOTES
     last_error to EBADF and raises an E_WARNING message.
   . posix_kill throws a ValueError when the process_id argument is lower
     or greater than what supports the platform (signed integer or long
-    range), posix_setpgid throws a ValueError when the process_id is
-    lower than zero or greater than what supports the platform.
+    range), posix_setpgid throws a ValueError when the process_id or
+    the process_group_id is lower than zero or greater than
+    what supports the platform.
+  . posix_setrlimit throws a ValueError when the hard_limit of soft_limit
+    argument are lower than -1 or if soft_limit is greater than hard_limit.
 
 - Reflection:
   . The output of ReflectionClass::toString() for enums has changed to
diff --git a/ext/posix/posix.c b/ext/posix/posix.c
index a418a653386..ff878b3acfc 100644
--- a/ext/posix/posix.c
+++ b/ext/posix/posix.c
@@ -126,9 +126,9 @@ ZEND_GET_MODULE(posix)
 	}	\
 	RETURN_TRUE;
 
-#define PHP_POSIX_CHECK_PID(pid, lower, upper)										\
+#define PHP_POSIX_CHECK_PID(pid, arg, lower, upper)										\
 	if (pid < lower || pid > upper) {										\
-		zend_argument_value_error(1, "must be between " ZEND_LONG_FMT " and " ZEND_LONG_FMT, lower, upper);	\
+		zend_argument_value_error(arg, "must be between " ZEND_LONG_FMT " and " ZEND_LONG_FMT, lower, upper);	\
 		RETURN_THROWS();											\
 	}
 
@@ -143,7 +143,7 @@ PHP_FUNCTION(posix_kill)
 		Z_PARAM_LONG(sig)
 	ZEND_PARSE_PARAMETERS_END();
 
-	PHP_POSIX_CHECK_PID(pid, POSIX_PID_MIN, POSIX_PID_MAX)
+	PHP_POSIX_CHECK_PID(pid, 1, POSIX_PID_MIN, POSIX_PID_MAX)
 
 	if (kill(pid, sig) < 0) {
 		POSIX_G(last_error) = errno;
@@ -307,7 +307,8 @@ PHP_FUNCTION(posix_setpgid)
 		Z_PARAM_LONG(pgid)
 	ZEND_PARSE_PARAMETERS_END();
 
-	PHP_POSIX_CHECK_PID(pid, 0, POSIX_PID_MAX)
+	PHP_POSIX_CHECK_PID(pid, 1, 0, POSIX_PID_MAX)
+	PHP_POSIX_CHECK_PID(pgid, 2, 0, POSIX_PID_MAX)
 
 	if (setpgid(pid, pgid) < 0) {
 		POSIX_G(last_error) = errno;
@@ -347,6 +348,8 @@ PHP_FUNCTION(posix_getsid)
 		Z_PARAM_LONG(val)
 	ZEND_PARSE_PARAMETERS_END();
 
+	PHP_POSIX_CHECK_PID(val, 1, 0, POSIX_PID_MAX)
+
 	if ((val = getsid(val)) < 0) {
 		POSIX_G(last_error) = errno;
 		RETURN_FALSE;
@@ -1201,6 +1204,21 @@ PHP_FUNCTION(posix_setrlimit)
 		Z_PARAM_LONG(max)
 	ZEND_PARSE_PARAMETERS_END();
 
+	if (cur < -1) {
+		zend_argument_value_error(2, "must be greater or equal to -1");
+		RETURN_THROWS();
+	}
+
+	if (max < -1) {
+		zend_argument_value_error(3, "must be greater or equal to -1");
+		RETURN_THROWS();
+	}
+
+	if (max > -1 && cur > max) {
+		zend_argument_value_error(2, "must be lower or equal to " ZEND_LONG_FMT, max);
+		RETURN_THROWS();
+	}
+
 	rl.rlim_cur = cur;
 	rl.rlim_max = max;
 
diff --git a/ext/posix/tests/posix_getsid_error.phpt b/ext/posix/tests/posix_getsid_error.phpt
index c62eca58a84..68f16855499 100644
--- a/ext/posix/tests/posix_getsid_error.phpt
+++ b/ext/posix/tests/posix_getsid_error.phpt
@@ -9,7 +9,11 @@ PHP Testfest Berlin 2009-05-10
 posix
 --FILE--
 <?php
-var_dump( posix_getsid(-1) );
+try {
+	posix_getsid(-1);
+} catch (\ValueError $e) {
+	echo $e->getMessage(), PHP_EOL;
+}
 ?>
---EXPECT--
-bool(false)
+--EXPECTF--
+posix_getsid(): Argument #1 ($process_id) must be between 0 and %d
diff --git a/ext/posix/tests/posix_setpgid_error.phpt b/ext/posix/tests/posix_setpgid_error.phpt
index 89cc45306e1..0d00dd87c60 100644
--- a/ext/posix/tests/posix_setpgid_error.phpt
+++ b/ext/posix/tests/posix_setpgid_error.phpt
@@ -16,7 +16,19 @@ try {
 } catch (\ValueError $e) {
 	echo $e->getMessage(), PHP_EOL;
 }
+try {
+	posix_setpgid(1, PHP_INT_MAX);
+} catch (\ValueError $e) {
+	echo $e->getMessage(), PHP_EOL;
+}
+try {
+	posix_setpgid(1, -2);
+} catch (\ValueError $e) {
+	echo $e->getMessage(), PHP_EOL;
+}
 ?>
 --EXPECTF--
 posix_setpgid(): Argument #1 ($process_id) must be between 0 and %d
 posix_setpgid(): Argument #1 ($process_id) must be between 0 and %d
+posix_setpgid(): Argument #2 ($process_group_id) must be between 0 and %d
+posix_setpgid(): Argument #2 ($process_group_id) must be between 0 and %d
diff --git a/ext/posix/tests/posix_setrlimit.phpt b/ext/posix/tests/posix_setrlimit.phpt
index cc8fadafc04..51638793f9d 100644
--- a/ext/posix/tests/posix_setrlimit.phpt
+++ b/ext/posix/tests/posix_setrlimit.phpt
@@ -12,9 +12,25 @@ if (str_contains(PHP_OS, 'FreeBSD')) die('skip different behavior on FreeBSD');
 <?php
 
 var_dump(posix_setrlimit(POSIX_RLIMIT_NOFILE, 128, 128));
-var_dump(posix_setrlimit(POSIX_RLIMIT_NOFILE, 129, 128));
+try {
+	posix_setrlimit(POSIX_RLIMIT_NOFILE, 129, 128);
+} catch (\ValueError $e) {
+	echo $e->getMessage(), PHP_EOL;
+}
+try {
+	posix_setrlimit(POSIX_RLIMIT_NOFILE, -2, -1);
+} catch (\ValueError $e) {
+	echo $e->getMessage(), PHP_EOL;
+}
+try {
+	posix_setrlimit(POSIX_RLIMIT_NOFILE, -1, -2);
+} catch (\ValueError $e) {
+	echo $e->getMessage(), PHP_EOL;
+}
 
 ?>
 --EXPECT--
 bool(true)
-bool(false)
+posix_setrlimit(): Argument #2 ($soft_limit) must be lower or equal to 128
+posix_setrlimit(): Argument #2 ($soft_limit) must be greater or equal to -1
+posix_setrlimit(): Argument #3 ($hard_limit) must be greater or equal to -1