[Devel] [PATCH vz10] selftests/prctl: skip anon VMA naming test when unsupported

[Konstantin Khorenko]

1. ack the patch

2. do not forget to remove the kludge in hci-kselftests:
  # prctl set-anon-vma-name-test test fails because CONFIG_ANON_VMA_NAME
  # is not enabled
  'prctl': ['set-anon-vma-name-test'],

3. There are 2 more bugs nearby, please fix them and send to ms as well:

In tools/testing/selftests/prctl/set-anon-vma-name-test.c,
FIXTURE_SETUP(vma) checks both mmap() results against NULL, but mmap() fails with MAP_FAILED, so neither ASSERT_NE() can ever fire.

        ASSERT_NE(self->ptr_anon, NULL);
        ASSERT_NE(self->ptr_not_anon, NULL);

--
Best regards,

Konstantin Khorenko,
Virtuozzo Linux Kernel Team

On 8/21/26 17:05, Eva Kurchatova wrote:
> PR_SET_VMA_ANON_NAME returns EINVAL on kernels built without
> CONFIG_ANON_VMA_NAME, and every renaming test then fails.
> 
> https://virtuozzo.atlassian.net/browse/VSTOR-142442
> Feature: fix selftests
> Signed-off-by: Eva Kurchatova <eva.kurchatova at virtuozzo.com>
> ---
>  .../testing/selftests/prctl/set-anon-vma-name-test.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/tools/testing/selftests/prctl/set-anon-vma-name-test.c b/tools/testing/selftests/prctl/set-anon-vma-name-test.c
> index 4275cb256dce..815470c47aff 100644
> --- a/tools/testing/selftests/prctl/set-anon-vma-name-test.c
> +++ b/tools/testing/selftests/prctl/set-anon-vma-name-test.c
> @@ -76,6 +76,18 @@ FIXTURE(vma) {
>  };
>  
>  FIXTURE_SETUP(vma) {
> +	void *probe;
> +	int res;
> +
> +	/* Naming anonymous VMAs needs CONFIG_ANON_VMA_NAME. */
> +	probe = mmap(NULL, AREA_SIZE, PROT_READ | PROT_WRITE,
> +					MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
> +	ASSERT_NE(probe, MAP_FAILED);
> +	res = rename_vma((unsigned long)probe, AREA_SIZE, GOOD_NAME);
> +	munmap(probe, AREA_SIZE);
> +	if (res == -EINVAL)
> +		SKIP(return, "CONFIG_ANON_VMA_NAME is not enabled");
> +
>  	self->ptr_anon = mmap(NULL, AREA_SIZE, PROT_READ | PROT_WRITE,
>  					MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
>  	ASSERT_NE(self->ptr_anon, NULL);