From: Stephen Smalley <sds@tycho.nsa.gov>
Date: Fri, 12 May 2017 16:41:24 +0000 (-0400)
Subject: selinux: do not check open permission on sockets
X-Git-Tag: v4.4.128~128
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=60c26da547da81cfe9ea1e7d65d514cc89deb82e;p=profile%2Fcommon%2Fplatform%2Fkernel%2Flinux-artik7.git

selinux: do not check open permission on sockets


[ Upstream commit ccb544781d34afdb73a9a73ae53035d824d193bf ]

open permission is currently only defined for files in the kernel
(COMMON_FILE_PERMS rather than COMMON_FILE_SOCK_PERMS). Construction of
an artificial test case that tries to open a socket via /proc/pid/fd will
generate a recvfrom avc denial because recvfrom and open happen to map to
the same permission bit in socket vs file classes.

open of a socket via /proc/pid/fd is not supported by the kernel regardless
and will ultimately return ENXIO. But we hit the permission check first and
can thus produce these odd/misleading denials.  Omit the open check when
operating on a socket.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 4f690ab..99212ff 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1942,8 +1942,9 @@ static inline u32 file_to_av(struct file *file)
 static inline u32 open_file_to_av(struct file *file)
 {
 	u32 av = file_to_av(file);
+	struct inode *inode = file_inode(file);
 
-	if (selinux_policycap_openperm)
+	if (selinux_policycap_openperm && inode->i_sb->s_magic != SOCKFS_MAGIC)
 		av |= FILE__OPEN;
 
 	return av;
@@ -2912,6 +2913,7 @@ static int selinux_inode_permission(struct inode *inode, int mask)
 static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
 {
 	const struct cred *cred = current_cred();
+	struct inode *inode = d_backing_inode(dentry);
 	unsigned int ia_valid = iattr->ia_valid;
 	__u32 av = FILE__WRITE;
 
@@ -2927,8 +2929,10 @@ static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
 			ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET))
 		return dentry_has_perm(cred, dentry, FILE__SETATTR);
 
-	if (selinux_policycap_openperm && (ia_valid & ATTR_SIZE)
-			&& !(ia_valid & ATTR_FILE))
+	if (selinux_policycap_openperm &&
+	    inode->i_sb->s_magic != SOCKFS_MAGIC &&
+	    (ia_valid & ATTR_SIZE) &&
+	    !(ia_valid & ATTR_FILE))
 		av |= FILE__OPEN;
 
 	return dentry_has_perm(cred, dentry, av);