diff options
author | Eric Paris <eparis@redhat.com> | 2009-12-04 15:47:52 -0500 |
---|---|---|
committer | Al Viro <viro@zeniv.linux.org.uk> | 2009-12-16 12:16:46 -0500 |
commit | 9353384ec8128cb443463016bbabb44ca857ff52 (patch) | |
tree | 411ff22e85868aea1575d8b133187def3b0e0498 /security | |
parent | ec29ea544b1ce204ba3575ba05fccf3069d00c3f (diff) | |
download | kernel_samsung_smdk4412-9353384ec8128cb443463016bbabb44ca857ff52.zip kernel_samsung_smdk4412-9353384ec8128cb443463016bbabb44ca857ff52.tar.gz kernel_samsung_smdk4412-9353384ec8128cb443463016bbabb44ca857ff52.tar.bz2 |
ima: only insert at inode creation time
iints are supposed to be allocated when an inode is allocated (during
security_inode_alloc()) But we have code which will attempt to allocate
an iint during measurement calls. If we couldn't allocate the iint and we
cared, we should have died during security_inode_alloc(). Not make the
code more complex and less efficient.
Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'security')
-rw-r--r-- | security/integrity/ima/ima.h | 1 | ||||
-rw-r--r-- | security/integrity/ima/ima_iint.c | 71 | ||||
-rw-r--r-- | security/integrity/ima/ima_main.c | 8 |
3 files changed, 14 insertions, 66 deletions
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 165eb53..349aabc 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -128,7 +128,6 @@ void ima_template_show(struct seq_file *m, void *e, */ struct ima_iint_cache *ima_iint_insert(struct inode *inode); struct ima_iint_cache *ima_iint_find_get(struct inode *inode); -struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode); void ima_iint_delete(struct inode *inode); void iint_free(struct kref *kref); void iint_rcu_free(struct rcu_head *rcu); diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c index 4a53f39..2f6ab52 100644 --- a/security/integrity/ima/ima_iint.c +++ b/security/integrity/ima/ima_iint.c @@ -45,22 +45,21 @@ out: return iint; } -/* Allocate memory for the iint associated with the inode - * from the iint_cache slab, initialize the iint, and - * insert it into the radix tree. - * - * On success return a pointer to the iint; on failure return NULL. +/** + * ima_inode_alloc - allocate an iint associated with an inode + * @inode: pointer to the inode */ -struct ima_iint_cache *ima_iint_insert(struct inode *inode) +int ima_inode_alloc(struct inode *inode) { struct ima_iint_cache *iint = NULL; int rc = 0; if (!ima_initialized) - return iint; + return 0; + iint = kmem_cache_alloc(iint_cache, GFP_NOFS); if (!iint) - return iint; + return -ENOMEM; rc = radix_tree_preload(GFP_NOFS); if (rc < 0) @@ -70,63 +69,13 @@ struct ima_iint_cache *ima_iint_insert(struct inode *inode) rc = radix_tree_insert(&ima_iint_store, (unsigned long)inode, iint); spin_unlock(&ima_iint_lock); out: - if (rc < 0) { + if (rc < 0) kmem_cache_free(iint_cache, iint); - if (rc == -EEXIST) { - spin_lock(&ima_iint_lock); - iint = radix_tree_lookup(&ima_iint_store, - (unsigned long)inode); - spin_unlock(&ima_iint_lock); - } else - iint = NULL; - } - radix_tree_preload_end(); - return iint; -} - -/** - * ima_inode_alloc - allocate an iint associated with an inode - * @inode: pointer to the inode - */ -int ima_inode_alloc(struct inode *inode) -{ - struct ima_iint_cache *iint; - - if (!ima_initialized) - return 0; - - iint = ima_iint_insert(inode); - if (!iint) - return -ENOMEM; - return 0; -} - -/* ima_iint_find_insert_get - get the iint associated with an inode - * - * Most insertions are done at inode_alloc, except those allocated - * before late_initcall. When the iint does not exist, allocate it, - * initialize and insert it, and increment the iint refcount. - * - * (Can't initialize at security_initcall before any inodes are - * allocated, got to wait at least until proc_init.) - * - * Return the iint. - */ -struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode) -{ - struct ima_iint_cache *iint = NULL; - iint = ima_iint_find_get(inode); - if (iint) - return iint; - - iint = ima_iint_insert(inode); - if (iint) - kref_get(&iint->refcount); + radix_tree_preload_end(); - return iint; + return rc; } -EXPORT_SYMBOL_GPL(ima_iint_find_insert_get); /* iint_free - called when the iint refcount goes to zero */ void iint_free(struct kref *kref) diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index b85e61b..96fafc0 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -161,7 +161,7 @@ int ima_path_check(struct path *path, int mask, int update_counts) if (!ima_initialized || !S_ISREG(inode->i_mode)) return 0; - iint = ima_iint_find_insert_get(inode); + iint = ima_iint_find_get(inode); if (!iint) return 0; @@ -219,7 +219,7 @@ static int process_measurement(struct file *file, const unsigned char *filename, if (!ima_initialized || !S_ISREG(inode->i_mode)) return 0; - iint = ima_iint_find_insert_get(inode); + iint = ima_iint_find_get(inode); if (!iint) return -ENOMEM; @@ -255,7 +255,7 @@ void ima_counts_put(struct path *path, int mask) */ if (!ima_initialized || !inode || !S_ISREG(inode->i_mode)) return; - iint = ima_iint_find_insert_get(inode); + iint = ima_iint_find_get(inode); if (!iint) return; @@ -286,7 +286,7 @@ void ima_counts_get(struct file *file) if (!ima_initialized || !S_ISREG(inode->i_mode)) return; - iint = ima_iint_find_insert_get(inode); + iint = ima_iint_find_get(inode); if (!iint) return; mutex_lock(&iint->mutex); |