linux-kernel - [PATCH 1/3] LSM: SafeSetID: fix userns bug in selftest

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Date:   Wed, 15 Jun 2022 15:50:44 -0700
From:   Micah Morton <mortonm@...omium.org>
To:     linux-security-module@...r.kernel.org
Cc:     keescook@...omium.org, jmorris@...ei.org, serge@...lyn.com,
        linux-kernel@...r.kernel.org, Micah Morton <mortonm@...omium.org>
Subject: [PATCH 1/3] LSM: SafeSetID: fix userns bug in selftest

Not sure how this bug got in here but its been there since the original
merge. I think I tested the code on a system that wouldn't let me
clone() with CLONE_NEWUSER flag set so had to comment out these
test_userns invocations.

Trying to map UID 0 inside the userns to UID 0 outside will never work,
even with CAP_SETUID. The code is supposed to test whether we can map
UID 0 in the userns to the UID of the parent process (the one with
CAP_SETUID that is writing the /proc/[pid]/uid_map file).

Signed-off-by: Micah Morton <mortonm@...omium.org>
---
 tools/testing/selftests/safesetid/safesetid-test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/safesetid/safesetid-test.c b/tools/testing/selftests/safesetid/safesetid-test.c
index 4b809c93ba36..111dcbcc0491 100644
--- a/tools/testing/selftests/safesetid/safesetid-test.c
+++ b/tools/testing/selftests/safesetid/safesetid-test.c
@@ -194,7 +194,7 @@ static bool test_userns(bool expect_success)
 			printf("preparing file name string failed");
 			return false;
 		}
-		success = write_file(map_file_name, "0 0 1", uid);
+		success = write_file(map_file_name, "0 %d 1", uid);
 		return success == expect_success;
 	}

-- 
2.36.1.476.g0c4daa206d-goog