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authorDmitry Kasatkin <d.kasatkin@samsung.com>2014-03-27 10:54:11 +0200
committerMimi Zohar <zohar@linux.vnet.ibm.com>2014-06-12 17:58:06 -0400
commitb882fae2d3a832fdcdc194c9f358390b1efca8e7 (patch)
tree2f9f2a00683176e02fee1acd59db3705a9228f35
parent3e38df56e6ef736f3ab516664697b55caa8f3238 (diff)
ima: prevent unnecessary policy checking
ima_rdwr_violation_check is called for every file openning. The function checks the policy even when violation condition is not met. It causes unnecessary policy checking. This patch does policy checking only if violation condition is met. Changelog: - check writecount is greater than zero (Mimi) Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
-rw-r--r--security/integrity/ima/ima_main.c13
1 files changed, 4 insertions, 9 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index dcc98cf542d8..7689c1e21f09 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -81,7 +81,6 @@ static void ima_rdwr_violation_check(struct file *file)
{
struct inode *inode = file_inode(file);
fmode_t mode = file->f_mode;
- int must_measure;
bool send_tomtou = false, send_writers = false;
char *pathbuf = NULL;
const char *pathname;
@@ -94,16 +93,12 @@ static void ima_rdwr_violation_check(struct file *file)
if (mode & FMODE_WRITE) {
if (atomic_read(&inode->i_readcount) && IS_IMA(inode))
send_tomtou = true;
- goto out;
+ } else {
+ if ((atomic_read(&inode->i_writecount) > 0) &&
+ ima_must_measure(inode, MAY_READ, FILE_CHECK))
+ send_writers = true;
}
- must_measure = ima_must_measure(inode, MAY_READ, FILE_CHECK);
- if (!must_measure)
- goto out;
-
- if (atomic_read(&inode->i_writecount) > 0)
- send_writers = true;
-out:
mutex_unlock(&inode->i_mutex);
if (!send_tomtou && !send_writers)