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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>
This commit is contained in:
Dmitry Kasatkin 2014-03-27 10:54:11 +02:00 committed by Mimi Zohar
parent 3e38df56e6
commit b882fae2d3
1 changed files with 4 additions and 9 deletions
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13
security/integrity/ima/ima_main.c
View File

@ -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)