[PATCH] selftests/mm: Check for YAMA ptrace_scope configuraiton before modifying it

[PATCH] selftests/mm: Check for YAMA ptrace_scope configuraiton before modifying it

[Mark Brown]

When running the memfd_secret test run_vmtests.sh unconditionally tries
to confgiure the YAMA LSM's ptrace_scope configuration, leading to an error
if YAMA is not in the running kernel:

# ./run_vmtests.sh: line 432: /proc/sys/kernel/yama/ptrace_scope: No such file or directory
# # ----------------------
# # running ./memfd_secret
# # ----------------------

Check that this file is present before trying to write to it.

The indentation here is a bit odd, and it doesn't seem great that we
configure but don't restore ptrace_scope.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 tools/testing/selftests/mm/run_vmtests.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
index dddd1dd8af14..33fc7fafa8f9 100755
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -429,7 +429,9 @@ CATEGORY="vma_merge" run_test ./merge
 
 if [ -x ./memfd_secret ]
 then
-(echo 0 > /proc/sys/kernel/yama/ptrace_scope 2>&1) | tap_prefix
+if [ -f /proc/sys/kernel/yama/ptrace_scope ]; then
+	(echo 0 > /proc/sys/kernel/yama/ptrace_scope 2>&1) | tap_prefix
+fi
 CATEGORY="memfd_secret" run_test ./memfd_secret
 fi
 

---
base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494
change-id: 20250605-selftest-mm-enable-yama-1541c2d2ddcd

Best regards,
-- 
Mark Brown <broonie@kernel.org>

Re: [PATCH] selftests/mm: Check for YAMA ptrace_scope configuraiton before modifying it

[Mike Rapoport]

On Tue, Jun 10, 2025 at 03:07:44PM +0100, Mark Brown wrote:
> When running the memfd_secret test run_vmtests.sh unconditionally tries
> to confgiure the YAMA LSM's ptrace_scope configuration, leading to an error
> if YAMA is not in the running kernel:
> 
> # ./run_vmtests.sh: line 432: /proc/sys/kernel/yama/ptrace_scope: No such file or directory
> # # ----------------------
> # # running ./memfd_secret
> # # ----------------------
> 
> Check that this file is present before trying to write to it.
> 
> The indentation here is a bit odd, and it doesn't seem great that we
> configure but don't restore ptrace_scope.
> 
> Signed-off-by: Mark Brown <broonie@kernel.org>

Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

> ---
>  tools/testing/selftests/mm/run_vmtests.sh | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
> index dddd1dd8af14..33fc7fafa8f9 100755
> --- a/tools/testing/selftests/mm/run_vmtests.sh
> +++ b/tools/testing/selftests/mm/run_vmtests.sh
> @@ -429,7 +429,9 @@ CATEGORY="vma_merge" run_test ./merge
>  
>  if [ -x ./memfd_secret ]
>  then
> -(echo 0 > /proc/sys/kernel/yama/ptrace_scope 2>&1) | tap_prefix
> +if [ -f /proc/sys/kernel/yama/ptrace_scope ]; then
> +	(echo 0 > /proc/sys/kernel/yama/ptrace_scope 2>&1) | tap_prefix
> +fi
>  CATEGORY="memfd_secret" run_test ./memfd_secret
>  fi
>  
> 
> ---
> base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494
> change-id: 20250605-selftest-mm-enable-yama-1541c2d2ddcd
> 
> Best regards,
> -- 
> Mark Brown <broonie@kernel.org>
> 

-- 
Sincerely yours,
Mike.

Re: [PATCH] selftests/mm: Check for YAMA ptrace_scope configuraiton before modifying it

[David Hildenbrand]

On 10.06.25 16:07, Mark Brown wrote:
> When running the memfd_secret test run_vmtests.sh unconditionally tries
> to confgiure the YAMA LSM's ptrace_scope configuration, leading to an error
> if YAMA is not in the running kernel:
> 
> # ./run_vmtests.sh: line 432: /proc/sys/kernel/yama/ptrace_scope: No such file or directory
> # # ----------------------
> # # running ./memfd_secret
> # # ----------------------
> 
> Check that this file is present before trying to write to it.
> 
> The indentation here is a bit odd, and it doesn't seem great that we
> configure but don't restore ptrace_scope.
> 
> Signed-off-by: Mark Brown <broonie@kernel.org>
> ---

Acked-by: David Hildenbrand <david@redhat.com>

-- 
Cheers,

David / dhildenb