ima: always maintain counters

commit 8262bb85da allocated the inode integrity struct (iint) before any
inodes were created. Only after IMA was initialized in late_initcall were
the counters updated. This patch updates the counters, whether or not IMA
has been initialized, to resolve 'imbalance' messages.

This patch fixes the bug as reported in bugzilla: 15673.  When the i915
is builtin, the ring_buffer is initialized before IMA, causing the
imbalance message on suspend.

Reported-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Tested-by: Thomas Meyer <thomas@m3y3r.de>
Tested-by: David Safford<safford@watson.ibm.com>
Cc: Stable Kernel <stable@kernel.org>
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 16d100d..3fbcd1d 100644 (file)
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -35,6 +35,7 @@ enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
 #define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
 
 /* set during initialization */
+extern int iint_initialized;
 extern int ima_initialized;
 extern int ima_used_chip;
 extern char *ima_hash;

diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c
index 7625b85..afba4ae 100644 (file)
--- a/security/integrity/ima/ima_iint.c
+++ b/security/integrity/ima/ima_iint.c
@@ -22,9 +22,10 @@
 
 RADIX_TREE(ima_iint_store, GFP_ATOMIC);
 DEFINE_SPINLOCK(ima_iint_lock);
-
 static struct kmem_cache *iint_cache __read_mostly;
 
+int iint_initialized = 0;
+
 /* ima_iint_find_get - return the iint associated with an inode
  *
  * ima_iint_find_get gets a reference to the iint. Caller must
@@ -141,6 +142,7 @@ static int __init ima_iintcache_init(void)
        iint_cache =
            kmem_cache_create("iint_cache", sizeof(struct ima_iint_cache), 0,
                              SLAB_PANIC, init_once);
+       iint_initialized = 1;
        return 0;
 }
 security_initcall(ima_iintcache_init);

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index f936413..e662b89 100644 (file)
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -148,12 +148,14 @@ void ima_counts_get(struct file *file)
        struct ima_iint_cache *iint;
        int rc;
 
-       if (!ima_initialized || !S_ISREG(inode->i_mode))
+       if (!iint_initialized || !S_ISREG(inode->i_mode))
                return;
        iint = ima_iint_find_get(inode);
        if (!iint)
                return;
        mutex_lock(&iint->mutex);
+       if (!ima_initialized)
+               goto out;
        rc = ima_must_measure(iint, inode, MAY_READ, FILE_CHECK);
        if (rc < 0)
                goto out;
@@ -213,7 +215,7 @@ void ima_file_free(struct file *file)
        struct inode *inode = file->f_dentry->d_inode;
        struct ima_iint_cache *iint;
 
-       if (!ima_initialized || !S_ISREG(inode->i_mode))
+       if (!iint_initialized || !S_ISREG(inode->i_mode))
                return;
        iint = ima_iint_find_get(inode);
        if (!iint)
@@ -230,7 +232,7 @@ static int process_measurement(struct file *file, const unsigned char *filename,
 {
        struct inode *inode = file->f_dentry->d_inode;
        struct ima_iint_cache *iint;
-       int rc;
+       int rc = 0;
 
        if (!ima_initialized || !S_ISREG(inode->i_mode))
                return 0;