From: Casey Schaufler <casey@schaufler-ca.com>
To: LSM <linux-security-module@vger.kernel.org>,
"James Morris" <jmorris@namei.org>,
"SE Linux" <selinux@tycho.nsa.gov>,
LKLM <linux-kernel@vger.kernel.org>,
"John Johansen" <john.johansen@canonical.com>,
"Kees Cook" <keescook@chromium.org>,
"Tetsuo Handa" <penguin-kernel@i-love.sakura.ne.jp>,
"Paul Moore" <paul@paul-moore.com>,
"Stephen Smalley" <sds@tycho.nsa.gov>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"Alexey Dobriyan" <adobriyan@gmail.com>,
"Mickaël Salaün" <mic@digikod.net>,
"Salvatore Mesoraca" <s.mesoraca16@gmail.com>
Subject: [PATCH v3 06/16] AppArmor: Abstract use of cred security blob
Date: Wed, 19 Sep 2018 17:20:28 -0700 [thread overview]
Message-ID: <2eb4065c-1bae-203c-dbe0-47980e009a2c@schaufler-ca.com> (raw)
In-Reply-To: <748c61cb-b6fa-c36d-a7b3-2315ff6292af@schaufler-ca.com>
AppArmor: Abstract use of cred security blob
Don't use the cred->security pointer directly.
Provide a helper function that provides the security blob pointer.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
security/apparmor/domain.c | 2 +-
security/apparmor/include/cred.h | 16 +++++++++++++++-
security/apparmor/lsm.c | 10 +++++-----
security/apparmor/task.c | 6 +++---
4 files changed, 24 insertions(+), 10 deletions(-)
diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
index 08c88de0ffda..726910bba84b 100644
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -975,7 +975,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
}
aa_put_label(cred_label(bprm->cred));
/* transfer reference, released when cred is freed */
- cred_label(bprm->cred) = new;
+ set_cred_label(bprm->cred, new);
done:
aa_put_label(label);
diff --git a/security/apparmor/include/cred.h b/security/apparmor/include/cred.h
index e287b7d0d4be..a90eae76d7c1 100644
--- a/security/apparmor/include/cred.h
+++ b/security/apparmor/include/cred.h
@@ -23,8 +23,22 @@
#include "policy_ns.h"
#include "task.h"
-#define cred_label(X) ((X)->security)
+static inline struct aa_label *cred_label(const struct cred *cred)
+{
+ struct aa_label **blob = cred->security;
+
+ AA_BUG(!blob);
+ return *blob;
+}
+static inline void set_cred_label(const struct cred *cred,
+ struct aa_label *label)
+{
+ struct aa_label **blob = cred->security;
+
+ AA_BUG(!blob);
+ *blob = label;
+}
/**
* aa_cred_raw_label - obtain cred's label
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 8b8b70620bbe..4f51705c3c71 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -57,7 +57,7 @@ DEFINE_PER_CPU(struct aa_buffers, aa_buffers);
static void apparmor_cred_free(struct cred *cred)
{
aa_put_label(cred_label(cred));
- cred_label(cred) = NULL;
+ set_cred_label(cred, NULL);
}
/*
@@ -65,7 +65,7 @@ static void apparmor_cred_free(struct cred *cred)
*/
static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
{
- cred_label(cred) = NULL;
+ set_cred_label(cred, NULL);
return 0;
}
@@ -75,7 +75,7 @@ static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
gfp_t gfp)
{
- cred_label(new) = aa_get_newest_label(cred_label(old));
+ set_cred_label(new, aa_get_newest_label(cred_label(old)));
return 0;
}
@@ -84,7 +84,7 @@ static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
*/
static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
{
- cred_label(new) = aa_get_newest_label(cred_label(old));
+ set_cred_label(new, aa_get_newest_label(cred_label(old)));
}
static void apparmor_task_free(struct task_struct *task)
@@ -1455,7 +1455,7 @@ static int __init set_init_ctx(void)
if (!ctx)
return -ENOMEM;
- cred_label(cred) = aa_get_label(ns_unconfined(root_ns));
+ set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
task_ctx(current) = ctx;
return 0;
diff --git a/security/apparmor/task.c b/security/apparmor/task.c
index c6b78a14da91..4551110f0496 100644
--- a/security/apparmor/task.c
+++ b/security/apparmor/task.c
@@ -81,7 +81,7 @@ int aa_replace_current_label(struct aa_label *label)
*/
aa_get_label(label);
aa_put_label(cred_label(new));
- cred_label(new) = label;
+ set_cred_label(new, label);
commit_creds(new);
return 0;
@@ -138,7 +138,7 @@ int aa_set_current_hat(struct aa_label *label, u64 token)
return -EACCES;
}
- cred_label(new) = aa_get_newest_label(label);
+ set_cred_label(new, aa_get_newest_label(label));
/* clear exec on switching context */
aa_put_label(ctx->onexec);
ctx->onexec = NULL;
@@ -172,7 +172,7 @@ int aa_restore_previous_label(u64 token)
return -ENOMEM;
aa_put_label(cred_label(new));
- cred_label(new) = aa_get_newest_label(ctx->previous);
+ set_cred_label(new, aa_get_newest_label(ctx->previous));
AA_BUG(!cred_label(new));
/* clear exec && prev information when restoring to previous context */
aa_clear_task_ctx_trans(ctx);
--
2.17.1
next prev parent reply other threads:[~2018-09-20 0:20 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-20 0:03 [PATCH v3 00/16] LSM: Module stacking in support of SARA and Landlock Casey Schaufler
2018-09-20 0:19 ` [PATCH v3 01/16] procfs: add smack subdir to attrs Casey Schaufler
2018-09-20 0:19 ` [PATCH v3 02/16] Smack: Abstract use of cred security blob Casey Schaufler
2018-09-20 0:19 ` [PATCH v3 03/16] SELinux: " Casey Schaufler
2018-09-20 0:20 ` [PATCH v3 04/16] SELinux: Remove cred security blob poisoning Casey Schaufler
2018-09-20 0:20 ` [PATCH v3 05/16] SELinux: Remove unused selinux_is_enabled Casey Schaufler
2018-09-20 0:20 ` Casey Schaufler [this message]
2018-09-20 0:20 ` [PATCH v3 07/16] TOMOYO: Abstract use of cred security blob Casey Schaufler
2018-09-20 17:13 ` Kees Cook
2018-09-20 0:20 ` [PATCH v3 08/16] LSM: Infrastructure management of the " Casey Schaufler
2018-09-20 0:20 ` [PATCH v3 09/16] SELinux: Abstract use of file " Casey Schaufler
2018-09-20 8:51 ` David Laight
2018-09-20 15:20 ` Casey Schaufler
2018-09-20 0:21 ` [PATCH v3 10/16] LSM: Infrastructure management of the " Casey Schaufler
2018-09-20 17:25 ` Kees Cook
2018-09-20 0:21 ` [PATCH v3 11/16] SELinux: Abstract use of inode " Casey Schaufler
2018-09-20 0:21 ` [PATCH v3 12/16] Smack: " Casey Schaufler
2018-09-20 0:21 ` [PATCH v3 13/16] LSM: Infrastructure management of the inode security Casey Schaufler
2018-09-20 0:21 ` [PATCH v3 14/16] LSM: Infrastructure management of the task security blob Casey Schaufler
2018-09-20 17:39 ` Kees Cook
2018-09-20 0:21 ` [PATCH v3 15/16] LSM: Infrastructure management of the ipc " Casey Schaufler
2018-09-20 17:44 ` Kees Cook
2018-09-20 0:21 ` [PATCH v3 16/16] LSM: Blob sharing support for S.A.R.A and LandLock Casey Schaufler
2018-09-20 17:56 ` Kees Cook
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