selftests: add pid namespace ENOMEM regression test

We recently regressed (cf. [1] and its corresponding fix in [2]) returning
ENOMEM when trying to create a process in a pid namespace whose init
process/child subreaper has already died. This has caused confusion at
least once before that (cf. [3]). Let's add a simple regression test to
catch this in the future.

[1]: 49cb2fc42ce4 ("fork: extend clone3() to support setting a PID")
[2]: b26ebfe12f34 ("pid: Fix error return value in some cases")
[3]: 35f71bc0a09a ("fork: report pid reservation failure properly")
Cc: Corey Minyard <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Adrian Reber <[email protected]>
Cc: Dmitry Safonov <[email protected]>
Cc: Andrei Vagin <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

diff --git a/MAINTAINERS b/MAINTAINERS
index a6fbdf354d3437a50109102244c3a39c70ef5a16..8cc9e6a7c1fa1785121dc9cfeec394fa0cee64af 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13158,6 +13158,7 @@ S:      Maintained
 T:     git git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git
 F:     samples/pidfd/
 F:     tools/testing/selftests/pidfd/
+F:     tools/testing/selftests/pid_namespace/
 F:     tools/testing/selftests/clone3/
 K:     (?i)pidfd
 K:     (?i)clone3

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 6ec503912bea1e5547235ecdedd5bde9fc87f85d..5fc587b7136f5bd0216e516fbf1ca87e85abb730 100644 (file)
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -38,6 +38,7 @@ TARGETS += netfilter
 TARGETS += networking/timestamping
 TARGETS += nsfs
 TARGETS += pidfd
+TARGETS += pid_namespace
 TARGETS += powerpc
 TARGETS += proc
 TARGETS += pstore

diff --git a/tools/testing/selftests/pid_namespace/.gitignore b/tools/testing/selftests/pid_namespace/.gitignore
new file mode 100644 (file)
index 0000000..93ab9d7
--- /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 (file)
index 0000000..dcaefa2
--- /dev/null
+++ b/tools/testing/selftests/pid_namespace/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+CFLAGS += -g -I../../../../usr/include/
+
+TEST_GEN_PROGS := regression_enomem
+
+include ../lib.mk
+
+$(OUTPUT)/regression_enomem: regression_enomem.c ../pidfd/pidfd.h

diff --git a/tools/testing/selftests/pid_namespace/config b/tools/testing/selftests/pid_namespace/config
new file mode 100644 (file)
index 0000000..26cdb27
--- /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 (file)
index 0000000..73d5325
--- /dev/null
+++ b/tools/testing/selftests/pid_namespace/regression_enomem.c
@@ -0,0 +1,45 @@
+#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.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

diff --git a/tools/testing/selftests/pidfd/pidfd.h b/tools/testing/selftests/pidfd/pidfd.h
index d482515604db5de08347b1438788be96e7f2d4b1..c1921a53dbed38c995f37a67a8d231060248746c 100644 (file)
--- a/tools/testing/selftests/pidfd/pidfd.h
+++ b/tools/testing/selftests/pidfd/pidfd.h
@@ -13,6 +13,8 @@
 #include <string.h>
 #include <syscall.h>
 #include <sys/mount.h>
+#include <sys/types.h>
+#include <sys/wait.h>
 
 #include "../kselftest.h"