Thread (49 messages) 49 messages, 2 authors, 2025-06-16

Re: [PATCH v4 04/42] selinux: dynamically allocate selinux namespace

From: Simon Horman <horms@kernel.org>
Date: 2025-06-13 14:14:50
Also in: selinux

On Tue, Jun 10, 2025 at 01:21:35PM -0400, Stephen Smalley wrote:
Move from static allocation of a single selinux namespace to
dynamic allocation.  Include necessary support for lifecycle management
of the selinux namespace, modeled after the user namespace support.

Signed-off-by: Stephen Smalley <stephen.smalley.work@gmail.com>
...
quoted hunk ↗ jump to hunk
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 112edf9b2106..c67965cbfcba 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -2202,7 +2202,7 @@ static void security_load_policycaps(struct selinux_state *state,
 static int security_preserve_bools(struct selinux_policy *oldpolicy,
 				struct selinux_policy *newpolicy);
 
-static void selinux_policy_free(struct selinux_policy *policy)
+void selinux_policy_free(struct selinux_policy __rcu *policy)
Hi Stephen,

It looks like this __rcu annotation is insufficient, and further updates
are needed. I didn't look further, but Sparse says:

  .../services.c:2212:27: warning: incorrect type in argument 1 (different address spaces)
  .../services.c:2212:27:    expected struct policydb *p
  .../services.c:2212:27:    got struct policydb [noderef] __rcu *
  .../services.c:2214:15: warning: incorrect type in argument 1 (different address spaces)
  .../services.c:2214:15:    expected void const *objp
  .../services.c:2214:15:    got struct selinux_policy [noderef] __rcu *policy
  .../services.c:2232:39: warning: incorrect type in argument 1 (different address spaces)
  .../services.c:2232:39:    expected struct selinux_policy [noderef] __rcu *policy
  .../services.c:2232:39:    got struct selinux_policy *policy
  .../services.c:2297:29: warning: incorrect type in argument 1 (different address spaces)
  .../services.c:2297:29:    expected struct selinux_policy [noderef] __rcu *policy
  .../services.c:2297:29:    got struct selinux_policy *[assigned] oldpolicy
  .../services.c:2210:24: warning: dereference of noderef expression
  .../services.c:2211:15: warning: dereference of noderef expression
  .../services.c:2213:15: warning: dereference of noderef expression


 {
 	if (!policy)
 		return;
...
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