4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stephen Smalley <sds@xxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxx>
Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
security/selinux/hooks.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2033,8 +2033,9 @@ static inline u32 file_to_av(struct 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;
@@ -3031,6 +3032,7 @@ static int selinux_inode_permission(stru
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;
@@ -3046,8 +3048,10 @@ static int selinux_inode_setattr(struct
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);