[PATCH v2 2/2] ipe: also reject policy updates with the same version

[luca.boccassi@gmail.com]

From: Luca Boccassi <bluca@debian.org>

Currently IPE accepts an update that has the same version as the policy
being updated, but it doesn't make it a no-op nor it checks that the
old and new policyes are the same. So it is possible to change the
content of a policy, without changing its version. This is very
confusing from userspace when managing policies.
Instead change the update logic to reject updates that have the same
version with ESTALE, as that is much clearer and intuitive behaviour.

Signed-off-by: Luca Boccassi <bluca@debian.org>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
---
v2: also update documentation

 Documentation/admin-guide/LSM/ipe.rst | 2 +-
 security/ipe/policy.c                 | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/LSM/ipe.rst b/Documentation/admin-guide/LSM/ipe.rst
index 47323494d119..7cd04d3261ad 100644
--- a/Documentation/admin-guide/LSM/ipe.rst
+++ b/Documentation/admin-guide/LSM/ipe.rst
@@ -269,7 +269,7 @@ in the kernel. This file is write-only and accepts a PKCS#7 signed
 policy. Two checks will always be performed on this policy: First, the
 ``policy_names`` must match with the updated version and the existing
 version. Second the updated policy must have a policy version greater than
-or equal to the currently-running version. This is to prevent rollback attacks.
+to the currently-running version. This is to prevent rollback attacks.
 
 The ``delete`` file is used to remove a policy that is no longer needed.
 This file is write-only and accepts a value of ``1`` to delete the policy.
diff --git a/security/ipe/policy.c b/security/ipe/policy.c
index 3a0069c6d5af..45f7d6a0ed23 100644
--- a/security/ipe/policy.c
+++ b/security/ipe/policy.c
@@ -106,7 +106,7 @@ int ipe_update_policy(struct inode *root, const char *text, size_t textlen,
 		goto err;
 	}
 
-	if (ver_to_u64(old) > ver_to_u64(new)) {
+	if (ver_to_u64(old) >= ver_to_u64(new)) {
 		rc = -ESTALE;
 		goto err;
 	}
-- 
2.39.5