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Subject[PATCH v3 14/15] ima: appraise measurement required
Date
Even if allowed to update security.ima, reset the appraisal
flags, forcing re-appraisal.

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
---
security/integrity/ima/ima_main.c | 33 +++++++++++++++++++++++++++++++--
1 files changed, 31 insertions(+), 2 deletions(-)
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 6531765..14c39a5 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -386,18 +386,47 @@ static int ima_protect_xattr(struct dentry *dentry, const char *xattr_name,
return 0;
}

+static void ima_reset_appraise_flags(struct inode *inode)
+{
+ struct integrity_iint_cache *iint;
+
+ if (!ima_initialized || !ima_appraise || !S_ISREG(inode->i_mode))
+ return;
+
+ iint = integrity_iint_find_get(inode);
+ if (!iint)
+ return;
+
+ mutex_lock(&iint->mutex);
+ iint->flags &= ~(IMA_COLLECTED | IMA_APPRAISED | IMA_MEASURED);
+ mutex_unlock(&iint->mutex);
+ kref_put(&iint->refcount, iint_free);
+ return;
+}
+
int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
const void *xattr_value, size_t xattr_value_len)
{
- return ima_protect_xattr(dentry, xattr_name, xattr_value,
+ int result;
+
+ result = ima_protect_xattr(dentry, xattr_name, xattr_value,
xattr_value_len);
+ if (!result)
+ ima_reset_appraise_flags(dentry->d_inode);
+ return result;
}

int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name)
{
- return ima_protect_xattr(dentry, xattr_name, NULL, 0);
+ int result;
+
+ result = ima_protect_xattr(dentry, xattr_name, NULL, 0);
+ if (!result)
+ ima_reset_appraise_flags(dentry->d_inode);
+ return result;
}

+
static int __init init_ima(void)
{
int error;
--
1.7.1.1


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