From bc6a6008e5e3c7a30191a7f19ab19e85b14b1705 Mon Sep 17 00:00:00 2001 From: Amerigo Wang Date: Thu, 20 Aug 2009 19:29:02 -0700 Subject: 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 Signed-off-by: OGAWA Hirofumi Acked-by: Stephen Smalley Acked-by: Eric Paris Cc: Eugene Teo Cc: Al Viro Cc: Christoph Hellwig Acked-by: James Morris Signed-off-by: Andrew Morton Signed-off-by: James Morris --- security/selinux/hooks.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) (limited to 'security/selinux/hooks.c') diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 6d0b1ccb5b9..ac79f9ef2da 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); -- cgit v1.2.3