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-rw-r--r--tools/testing/selftests/pid_namespace/.gitignore1
-rw-r--r--tools/testing/selftests/pid_namespace/Makefile8
-rw-r--r--tools/testing/selftests/pid_namespace/config2
-rw-r--r--tools/testing/selftests/pid_namespace/regression_enomem.c44
4 files changed, 55 insertions, 0 deletions
diff --git a/tools/testing/selftests/pid_namespace/.gitignore b/tools/testing/selftests/pid_namespace/.gitignore
new file mode 100644
index 0000000000..93ab9d7e5b
--- /dev/null
+++ b/tools/testing/selftests/pid_namespace/.gitignore
@@ -0,0 +1 @@
+regression_enomem
diff --git a/tools/testing/selftests/pid_namespace/Makefile b/tools/testing/selftests/pid_namespace/Makefile
new file mode 100644
index 0000000000..9286a1d22c
--- /dev/null
+++ b/tools/testing/selftests/pid_namespace/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+CFLAGS += -g $(KHDR_INCLUDES)
+
+TEST_GEN_PROGS = regression_enomem
+
+LOCAL_HDRS += $(selfdir)/pidfd/pidfd.h
+
+include ../lib.mk
diff --git a/tools/testing/selftests/pid_namespace/config b/tools/testing/selftests/pid_namespace/config
new file mode 100644
index 0000000000..26cdb27e7d
--- /dev/null
+++ b/tools/testing/selftests/pid_namespace/config
@@ -0,0 +1,2 @@
+CONFIG_PID_NS=y
+CONFIG_USER_NS=y
diff --git a/tools/testing/selftests/pid_namespace/regression_enomem.c b/tools/testing/selftests/pid_namespace/regression_enomem.c
new file mode 100644
index 0000000000..7d84097ad4
--- /dev/null
+++ b/tools/testing/selftests/pid_namespace/regression_enomem.c
@@ -0,0 +1,44 @@
+#define _GNU_SOURCE
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/types.h>
+#include <sched.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syscall.h>
+#include <sys/wait.h>
+
+#include "../kselftest_harness.h"
+#include "../pidfd/pidfd.h"
+
+/*
+ * Regression test for:
+ * 35f71bc0a09a ("fork: report pid reservation failure properly")
+ * b26ebfe12f34 ("pid: Fix error return value in some cases")
+ */
+TEST(regression_enomem)
+{
+ pid_t pid;
+
+ if (geteuid())
+ EXPECT_EQ(0, unshare(CLONE_NEWUSER));
+
+ EXPECT_EQ(0, unshare(CLONE_NEWPID));
+
+ pid = fork();
+ ASSERT_GE(pid, 0);
+
+ if (pid == 0)
+ exit(EXIT_SUCCESS);
+
+ EXPECT_EQ(0, wait_for_pid(pid));
+
+ pid = fork();
+ ASSERT_LT(pid, 0);
+ ASSERT_EQ(errno, ENOMEM);
+}
+
+TEST_HARNESS_MAIN