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Subject[PATCH] IMA: remove read permissions on the ima policy file
Date
The IMA policy file does not implement read.  Trying to just open/read/close
the file will load a blank policy and you cannot then change the policy
without a reboot. This removes the read permission from the file so one must
at least be attempting to write...

Signed-off-by: Eric Paris <eparis@redhat.com>
---
security/integrity/ima/ima_fs.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 510186f..2a829da 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -15,6 +15,7 @@
* implemenents security file system for reporting
* current measurement list and IMA statistics
*/
+#include <linux/fcntl.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/rculist.h>
@@ -283,6 +284,9 @@ static atomic_t policy_opencount = ATOMIC_INIT(1);
*/
int ima_open_policy(struct inode * inode, struct file * filp)
{
+ /* No point in being allowed to open it if you aren't going to write */
+ if (!(filp->f_flags & O_WRONLY))
+ return -EACCES;
if (atomic_dec_and_test(&policy_opencount))
return 0;
return -EBUSY;
@@ -349,7 +353,7 @@ int ima_fs_init(void)
goto out;

ima_policy = securityfs_create_file("policy",
- S_IRUSR | S_IRGRP | S_IWUSR,
+ S_IWUSR,
ima_dir, NULL,
&ima_measure_policy_ops);
if (IS_ERR(ima_policy))


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