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authorMimi Zohar <zohar@linux.vnet.ibm.com>2009-02-04 15:07:02 +0100
committerJames Morris <jmorris@namei.org>2009-02-05 23:05:33 +0100
commit1df9f0a73178718969ae47d813b8e7aab2cf073c (patch)
tree6bd3d8838858f0e93acd8f7969b7d0e5ce2bfb08 /security/integrity/ima/ima_iint.c
parentintegrity: IMA policy open (diff)
downloadlinux-1df9f0a73178718969ae47d813b8e7aab2cf073c.tar.xz
linux-1df9f0a73178718969ae47d813b8e7aab2cf073c.zip
Integrity: IMA file free imbalance
The number of calls to ima_path_check()/ima_file_free() should be balanced. An extra call to fput(), indicates the file could have been accessed without first being measured. Although f_count is incremented/decremented in places other than fget/fput, like fget_light/fput_light and get_file, the current task must already hold a file refcnt. The call to __fput() is delayed until the refcnt becomes 0, resulting in ima_file_free() flagging any changes. - add hook to increment opencount for IPC shared memory(SYSV), shmat files, and /dev/zero - moved NULL iint test in opencount_get() Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/integrity/ima/ima_iint.c')
-rw-r--r--security/integrity/ima/ima_iint.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c
index 750db3c993a7..1f035e8d29c7 100644
--- a/security/integrity/ima/ima_iint.c
+++ b/security/integrity/ima/ima_iint.c
@@ -126,6 +126,7 @@ struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode)
return iint;
}
+EXPORT_SYMBOL_GPL(ima_iint_find_insert_get);
/* iint_free - called when the iint refcount goes to zero */
void iint_free(struct kref *kref)
@@ -134,6 +135,21 @@ void iint_free(struct kref *kref)
refcount);
iint->version = 0;
iint->flags = 0UL;
+ if (iint->readcount != 0) {
+ printk(KERN_INFO "%s: readcount: %ld\n", __FUNCTION__,
+ iint->readcount);
+ iint->readcount = 0;
+ }
+ if (iint->writecount != 0) {
+ printk(KERN_INFO "%s: writecount: %ld\n", __FUNCTION__,
+ iint->writecount);
+ iint->writecount = 0;
+ }
+ if (iint->opencount != 0) {
+ printk(KERN_INFO "%s: opencount: %ld\n", __FUNCTION__,
+ iint->opencount);
+ iint->opencount = 0;
+ }
kref_set(&iint->refcount, 1);
kmem_cache_free(iint_cache, iint);
}
@@ -174,6 +190,7 @@ static void init_once(void *foo)
mutex_init(&iint->mutex);
iint->readcount = 0;
iint->writecount = 0;
+ iint->opencount = 0;
kref_set(&iint->refcount, 1);
}