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authorJohn Johansen <john.johansen@canonical.com>2018-06-05 05:44:59 +0300
committerJohn Johansen <john.johansen@canonical.com>2018-06-07 11:50:49 +0300
commita4c3f89c9b5a9fab5a8e4ea05399acd6e23072df (patch)
tree7a92b037adce16071b0ca0207115b7d8f434c5c6
parent99cc45e486786c7215a7e39824c3bbaf7cf2fc08 (diff)
downloadlinux-a4c3f89c9b5a9fab5a8e4ea05399acd6e23072df.tar.xz
apparmor: fixup secid map conversion to using IDR
The IDR conversion did not handle an error case for when allocating a mapping fails, and it did not ensure that mappings did not allocate or use a 0 value, which is used as an invalid secid. Which is used when a mapping fails. Fixes: 3ae7eb49a2be ("apparmor: Use an IDR to allocate apparmor secids") Signed-off-by: John Johansen <john.johansen@canonical.com>
-rw-r--r--security/apparmor/include/secid.h4
-rw-r--r--security/apparmor/label.c3
-rw-r--r--security/apparmor/lsm.c2
-rw-r--r--security/apparmor/secid.c28
4 files changed, 29 insertions, 8 deletions
diff --git a/security/apparmor/include/secid.h b/security/apparmor/include/secid.h
index 686de8e50a79..dee6fa3b6081 100644
--- a/security/apparmor/include/secid.h
+++ b/security/apparmor/include/secid.h
@@ -28,8 +28,10 @@ int apparmor_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid);
void apparmor_release_secctx(char *secdata, u32 seclen);
-u32 aa_alloc_secid(struct aa_label *label, gfp_t gfp);
+int aa_alloc_secid(struct aa_label *label, gfp_t gfp);
void aa_free_secid(u32 secid);
void aa_secid_update(u32 secid, struct aa_label *label);
+void aa_secids_init(void);
+
#endif /* __AA_SECID_H */
diff --git a/security/apparmor/label.c b/security/apparmor/label.c
index a17574df611b..ba11bdf9043a 100644
--- a/security/apparmor/label.c
+++ b/security/apparmor/label.c
@@ -407,8 +407,7 @@ bool aa_label_init(struct aa_label *label, int size, gfp_t gfp)
AA_BUG(!label);
AA_BUG(size < 1);
- label->secid = aa_alloc_secid(label, gfp);
- if (label->secid == AA_SECID_INVALID)
+ if (aa_alloc_secid(label, gfp) < 0)
return false;
label->size = size; /* doesn't include null */
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 10bf36aa477d..e35d12883990 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1547,6 +1547,8 @@ static int __init apparmor_init(void)
return 0;
}
+ aa_secids_init();
+
error = aa_setup_dfa_engine();
if (error) {
AA_ERROR("Unable to setup dfa engine\n");
diff --git a/security/apparmor/secid.c b/security/apparmor/secid.c
index 3ad94b2ffbb2..f2f22d00db18 100644
--- a/security/apparmor/secid.c
+++ b/security/apparmor/secid.c
@@ -33,6 +33,8 @@
* properly updating/freeing them
*/
+#define AA_FIRST_SECID 1
+
static DEFINE_IDR(aa_secids);
static DEFINE_SPINLOCK(secid_lock);
@@ -120,20 +122,31 @@ void apparmor_release_secctx(char *secdata, u32 seclen)
/**
* aa_alloc_secid - allocate a new secid for a profile
+ * @label: the label to allocate a secid for
+ * @gfp: memory allocation flags
+ *
+ * Returns: 0 with @label->secid initialized
+ * <0 returns error with @label->secid set to AA_SECID_INVALID
*/
-u32 aa_alloc_secid(struct aa_label *label, gfp_t gfp)
+int aa_alloc_secid(struct aa_label *label, gfp_t gfp)
{
unsigned long flags;
- u32 secid;
+ int ret;
idr_preload(gfp);
spin_lock_irqsave(&secid_lock, flags);
- secid = idr_alloc(&aa_secids, label, 0, 0, GFP_ATOMIC);
- /* XXX: Can return -ENOMEM */
+ ret = idr_alloc(&aa_secids, label, AA_FIRST_SECID, 0, GFP_ATOMIC);
spin_unlock_irqrestore(&secid_lock, flags);
idr_preload_end();
- return secid;
+ if (ret < 0) {
+ label->secid = AA_SECID_INVALID;
+ return ret;
+ }
+
+ AA_BUG(ret == AA_SECID_INVALID);
+ label->secid = ret;
+ return 0;
}
/**
@@ -148,3 +161,8 @@ void aa_free_secid(u32 secid)
idr_remove(&aa_secids, secid);
spin_unlock_irqrestore(&secid_lock, flags);
}
+
+void aa_secids_init(void)
+{
+ idr_init_base(&aa_secids, AA_FIRST_SECID);
+}