From: Stephen Smalley <sds@tycho.nsa.gov>
Date: Mon, 17 Mar 2008 12:55:18 +0000 (-0400)
Subject: selinux: handle files opened with flags 3 by checking ioctl permission
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0794c66d49885a2f615618ce4940434b5b067d84;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

selinux: handle files opened with flags 3 by checking ioctl permission

Handle files opened with flags 3 by checking ioctl permission.

Default to returning FILE__IOCTL from file_to_av() if the f_mode has neither
FMODE_READ nor FMODE_WRITE, and thus check ioctl permission on exec or
transfer, thereby validating such descriptors early as with normal r/w
descriptors and catching leaks of them prior to attempted usage.

Signed-off-by:  Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
---

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 41a049f50f58..c2fef7b12dc7 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1630,6 +1630,12 @@ static inline u32 file_to_av(struct file *file)
 		else
 			av |= FILE__WRITE;
 	}
+	if (!av) {
+		/*
+		 * Special file opened with flags 3 for ioctl-only use.
+		 */
+		av = FILE__IOCTL;
+	}
 
 	return av;
 }