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-rw-r--r--security/smack/smack_lsm.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 3410e3abd19b..7bcf9edf768d 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -1462,19 +1462,32 @@ static int smack_file_receive(struct file *file)
/**
* smack_file_open - Smack dentry open processing
* @file: the object
- * @cred: unused
+ * @cred: task credential
*
* Set the security blob in the file structure.
+ * Allow the open only if the task has read access. There are
+ * many read operations (e.g. fstat) that you can do with an
+ * fd even if you have the file open write-only.
*
* Returns 0
*/
static int smack_file_open(struct file *file, const struct cred *cred)
{
+ struct task_smack *tsp = cred->security;
struct inode_smack *isp = file_inode(file)->i_security;
+ struct smk_audit_info ad;
+ int rc;
- file->f_security = isp->smk_inode;
+ if (smack_privileged(CAP_MAC_OVERRIDE))
+ return 0;
- return 0;
+ smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
+ smk_ad_setfield_u_fs_path(&ad, file->f_path);
+ rc = smk_access(tsp->smk_task, isp->smk_inode, MAY_READ, &ad);
+ if (rc == 0)
+ file->f_security = isp->smk_inode;
+
+ return rc;
}
/*

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