diff options
| author | Amerigo Wang <amwang@redhat.com> | 2009-08-20 19:29:02 -0700 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-08-21 14:25:30 +1000 |
| commit | bc6a6008e5e3c7a30191a7f19ab19e85b14b1705 (patch) | |
| tree | 46504659c2303224cb3c8ad13e1d1b580351b41b /security | |
| parent | ece13879e74313e62109e0755dd3d4f172df89e2 (diff) | |
| download | lwn-bc6a6008e5e3c7a30191a7f19ab19e85b14b1705.tar.gz lwn-bc6a6008e5e3c7a30191a7f19ab19e85b14b1705.zip | |
selinux: adjust rules for ATTR_FORCE
As suggested by OGAWA Hirofumi in thread:
http://lkml.org/lkml/2009/8/7/132, we should let selinux_inode_setattr()
to match our ATTR_* rules. ATTR_FORCE should not force things like
ATTR_SIZE.
[hirofumi@mail.parknet.co.jp: tweaks]
Signed-off-by: WANG Cong <amwang@redhat.com>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Eric Paris <eparis@redhat.com>
Cc: Eugene Teo <eteo@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/selinux/hooks.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 6d0b1ccb5b99..ac79f9ef2da8 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2711,12 +2711,18 @@ 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(); + unsigned int ia_valid = iattr->ia_valid; + + /* ATTR_FORCE is just used for ATTR_KILL_S[UG]ID. */ + if (ia_valid & ATTR_FORCE) { + ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_MODE | + ATTR_FORCE); + if (!ia_valid) + return 0; + } - if (iattr->ia_valid & ATTR_FORCE) - return 0; - - if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | - ATTR_ATIME_SET | ATTR_MTIME_SET)) + if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | + ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET)) return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR); return dentry_has_perm(cred, NULL, dentry, FILE__WRITE); |