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authorEric Paris <eparis@redhat.com>2010-10-25 14:42:19 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 11:37:19 -0700
commit196f518128d2ee6e0028b50e6fec0313640db142 (patch)
tree43a1d76bee477dbaa682233979e86f58a98369f0 /security
parent64c62f06bef8314a64d3189cb9c78062d54169b3 (diff)
downloadlinux-2.6.38-lt-ux500-196f518128d2ee6e0028b50e6fec0313640db142.tar.gz
IMA: explicit IMA i_flag to remove global lock on inode_delete
Currently for every removed inode IMA must take a global lock and search the IMA rbtree looking for an associated integrity structure. Instead we explicitly mark an inode when we add an integrity structure so we only have to take the global lock and do the removal if it exists. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security')
-rw-r--r--security/integrity/ima/ima_iint.c16
-rw-r--r--security/integrity/ima/ima_main.c1
2 files changed, 12 insertions, 5 deletions
diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c
index 969a1c1cb33..c442e47b678 100644
--- a/security/integrity/ima/ima_iint.c
+++ b/security/integrity/ima/ima_iint.c
@@ -59,6 +59,9 @@ struct ima_iint_cache *ima_iint_find(struct inode *inode)
{
struct ima_iint_cache *iint;
+ if (!IS_IMA(inode))
+ return NULL;
+
spin_lock(&ima_iint_lock);
iint = __ima_iint_find(inode);
spin_unlock(&ima_iint_lock);
@@ -91,6 +94,7 @@ int ima_inode_alloc(struct inode *inode)
new_iint->inode = inode;
new_node = &new_iint->rb_node;
+ mutex_lock(&inode->i_mutex); /* i_flags */
spin_lock(&ima_iint_lock);
p = &ima_iint_tree.rb_node;
@@ -107,14 +111,17 @@ int ima_inode_alloc(struct inode *inode)
goto out_err;
}
+ inode->i_flags |= S_IMA;
rb_link_node(new_node, parent, p);
rb_insert_color(new_node, &ima_iint_tree);
spin_unlock(&ima_iint_lock);
+ mutex_unlock(&inode->i_mutex); /* i_flags */
return 0;
out_err:
spin_unlock(&ima_iint_lock);
+ mutex_unlock(&inode->i_mutex); /* i_flags */
iint_free(new_iint);
return rc;
@@ -135,15 +142,14 @@ void ima_inode_free(struct inode *inode)
inode->i_readcount = 0;
+ if (!IS_IMA(inode))
+ return;
+
spin_lock(&ima_iint_lock);
iint = __ima_iint_find(inode);
- if (iint)
- rb_erase(&iint->rb_node, &ima_iint_tree);
+ rb_erase(&iint->rb_node, &ima_iint_tree);
spin_unlock(&ima_iint_lock);
- if (!iint)
- return;
-
iint_free(iint);
}
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 1dccafef749..60dd61527b1 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -211,6 +211,7 @@ void ima_file_free(struct file *file)
if (!iint_initialized || !S_ISREG(inode->i_mode))
return;
+
iint = ima_iint_find(inode);
if (iint)