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selftests/memfd: run sysctl tests when PID namespace support is enabled

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commit 6a75f19af1 upstream.

The sysctl tests for vm.memfd_noexec rely on the kernel to support PID
namespaces (i.e.  the kernel is built with CONFIG_PID_NS=y).  If the
kernel the test runs on does not support PID namespaces, the first sysctl
test will fail when attempting to spawn a new thread in a new PID
namespace, abort the test, preventing the remaining tests from being run.

This is not desirable, as not all kernels need PID namespaces, but can
still use the other features provided by memfd.  Therefore, only run the
sysctl tests if the kernel supports PID namespaces.  Otherwise, skip those
tests and emit an informative message to let the user know why the sysctl
tests are not being run.

Link: https://lkml.kernel.org/r/20241205192943.3228757-1-isaacmanjarres@google.com
Fixes: 11f75a0144 ("selftests/memfd: add tests for MFD_NOEXEC_SEAL MFD_EXEC")
Signed-off-by: Isaac J. Manjarres <isaacmanjarres@google.com>
Reviewed-by: Jeff Xu <jeffxu@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: <stable@vger.kernel.org>	[6.6+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Isaac J. Manjarres
2024-12-05 11:29:41 -08:00
committed by Greg Kroah-Hartman
parent 2f6ad0b613
commit 8b7dfdf3db
1 changed files with 12 additions and 2 deletions
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tools/testing/selftests/memfd/memfd_test.c
+12 -2
View File
@@ -9,6 +9,7 @@
#include <fcntl.h>
#include <linux/memfd.h>
#include <sched.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
@@ -1567,6 +1568,11 @@ static void test_share_fork(char *banner, char *b_suffix)
close(fd);
}
static bool pid_ns_supported(void)
{
return access("/proc/self/ns/pid", F_OK) == 0;
}
int main(int argc, char **argv)
{
pid_t pid;
@@ -1601,8 +1607,12 @@ int main(int argc, char **argv)
test_seal_grow();
test_seal_resize();
test_sysctl_simple();
test_sysctl_nested();
if (pid_ns_supported()) {
test_sysctl_simple();
test_sysctl_nested();
} else {
printf("PID namespaces are not supported; skipping sysctl tests\n");
}
test_share_dup("SHARE-DUP", "");
test_share_mmap("SHARE-MMAP", "");