* [PATCH v2] selinux: fix a type cast problem in cred_init_security()
@ 2022-01-27 18:21 Paul Moore
2022-01-28 1:33 ` Paul Moore
0 siblings, 1 reply; 2+ messages in thread
From: Paul Moore @ 2022-01-27 18:21 UTC (permalink / raw)
To: selinux
In the process of removing an explicit type cast to preserve a cred
const qualifier in cred_init_security() we ran into a problem where
the task_struct::real_cred field is defined with the "__rcu"
attribute but the selinux_cred() function parameter is not, leading
to a sparse warning:
security/selinux/hooks.c:216:36: sparse: sparse:
incorrect type in argument 1 (different address spaces)
@@ expected struct cred const *cred
@@ got struct cred const [noderef] __rcu *real_cred
As we don't want to add the "__rcu" attribute to the selinux_cred()
parameter, we're going to add an explicit cast back to
cred_init_security().
Fixes: b084e189b01a ("selinux: simplify cred_init_security")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
---
security/selinux/hooks.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index eae7dbd62df1..221e642025f5 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -213,7 +213,7 @@ static void cred_init_security(void)
{
struct task_security_struct *tsec;
- tsec = selinux_cred(current->real_cred);
+ tsec = selinux_cred(unrcu_pointer(current->real_cred));
tsec->osid = tsec->sid = SECINITSID_KERNEL;
}
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] selinux: fix a type cast problem in cred_init_security()
2022-01-27 18:21 [PATCH v2] selinux: fix a type cast problem in cred_init_security() Paul Moore
@ 2022-01-28 1:33 ` Paul Moore
0 siblings, 0 replies; 2+ messages in thread
From: Paul Moore @ 2022-01-28 1:33 UTC (permalink / raw)
To: selinux
On Thu, Jan 27, 2022 at 1:21 PM Paul Moore <paul@paul-moore.com> wrote:
>
> In the process of removing an explicit type cast to preserve a cred
> const qualifier in cred_init_security() we ran into a problem where
> the task_struct::real_cred field is defined with the "__rcu"
> attribute but the selinux_cred() function parameter is not, leading
> to a sparse warning:
>
> security/selinux/hooks.c:216:36: sparse: sparse:
> incorrect type in argument 1 (different address spaces)
> @@ expected struct cred const *cred
> @@ got struct cred const [noderef] __rcu *real_cred
>
> As we don't want to add the "__rcu" attribute to the selinux_cred()
> parameter, we're going to add an explicit cast back to
> cred_init_security().
>
> Fixes: b084e189b01a ("selinux: simplify cred_init_security")
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Paul Moore <paul@paul-moore.com>
> ---
> security/selinux/hooks.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Merged.
--
paul-moore.com
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