X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=fs%2Fattr.c;h=26c71ba1eed49d2f500c9e8044e68693492a47ee;hb=f31d731e4467e61de51d7f6d7115f3b712d9354c;hp=f8dfc2269d85634aa61ebb19a761e986ea0bbc93;hpb=39fe5434cb9de5da40510028b17b96bc4eb312b3;p=linux-2.6-omap-h63xx.git

diff --git a/fs/attr.c b/fs/attr.c
index f8dfc2269d8..26c71ba1eed 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -51,7 +51,7 @@ int inode_change_ok(struct inode *inode, struct iattr *attr)
 	}
 
 	/* Check for setting the inode time. */
-	if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET)) {
+	if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) {
 		if (!is_owner_or_cap(inode))
 			goto error;
 	}
@@ -103,12 +103,16 @@ EXPORT_SYMBOL(inode_setattr);
 int notify_change(struct dentry * dentry, struct iattr * attr)
 {
 	struct inode *inode = dentry->d_inode;
-	mode_t mode;
+	mode_t mode = inode->i_mode;
 	int error;
 	struct timespec now;
 	unsigned int ia_valid = attr->ia_valid;
 
-	mode = inode->i_mode;
+	if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_TIMES_SET)) {
+		if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+			return -EPERM;
+	}
+
 	now = current_fs_time(inode->i_sb);
 
 	attr->ia_ctime = now;
@@ -116,18 +120,34 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
 		attr->ia_atime = now;
 	if (!(ia_valid & ATTR_MTIME_SET))
 		attr->ia_mtime = now;
+	if (ia_valid & ATTR_KILL_PRIV) {
+		attr->ia_valid &= ~ATTR_KILL_PRIV;
+		ia_valid &= ~ATTR_KILL_PRIV;
+		error = security_inode_need_killpriv(dentry);
+		if (error > 0)
+			error = security_inode_killpriv(dentry);
+		if (error)
+			return error;
+	}
+
+	/*
+	 * We now pass ATTR_KILL_S*ID to the lower level setattr function so
+	 * that the function has the ability to reinterpret a mode change
+	 * that's due to these bits. This adds an implicit restriction that
+	 * no function will ever call notify_change with both ATTR_MODE and
+	 * ATTR_KILL_S*ID set.
+	 */
+	if ((ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID)) &&
+	    (ia_valid & ATTR_MODE))
+		BUG();
+
 	if (ia_valid & ATTR_KILL_SUID) {
-		attr->ia_valid &= ~ATTR_KILL_SUID;
 		if (mode & S_ISUID) {
-			if (!(ia_valid & ATTR_MODE)) {
-				ia_valid = attr->ia_valid |= ATTR_MODE;
-				attr->ia_mode = inode->i_mode;
-			}
-			attr->ia_mode &= ~S_ISUID;
+			ia_valid = attr->ia_valid |= ATTR_MODE;
+			attr->ia_mode = (inode->i_mode & ~S_ISUID);
 		}
 	}
 	if (ia_valid & ATTR_KILL_SGID) {
-		attr->ia_valid &= ~ ATTR_KILL_SGID;
 		if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
 			if (!(ia_valid & ATTR_MODE)) {
 				ia_valid = attr->ia_valid |= ATTR_MODE;
@@ -136,7 +156,7 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
 			attr->ia_mode &= ~S_ISGID;
 		}
 	}
-	if (!attr->ia_valid)
+	if (!(attr->ia_valid & ~(ATTR_KILL_SUID | ATTR_KILL_SGID)))
 		return 0;
 
 	if (ia_valid & ATTR_SIZE)