X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fattr.c;h=9fe1b1bd30a808c82b1ebfbd8f644732e4f36f3c;hb=6a396f67d2442e30150ffb5e1142dbb2f2181d3f;hp=b34732506f1dcf3602ac721c5c4336f6e59697a1;hpb=4a30131e7dbb17e5fec6958bfac9da9aff1fa29b;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/attr.c b/fs/attr.c
index b347325..9fe1b1b 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -9,12 +9,11 @@
 #include <linux/time.h>
 #include <linux/mm.h>
 #include <linux/string.h>
-#include <linux/smp_lock.h>
+#include <linux/capability.h>
 #include <linux/fsnotify.h>
 #include <linux/fcntl.h>
 #include <linux/quotaops.h>
 #include <linux/security.h>
-#include <linux/time.h>
 
 /* Taken over from the old code... */
 
@@ -30,20 +29,20 @@ int inode_change_ok(struct inode *inode, struct iattr *attr)
 
 	/* Make sure a caller can chown. */
 	if ((ia_valid & ATTR_UID) &&
-	    (current->fsuid != inode->i_uid ||
+	    (current_fsuid() != inode->i_uid ||
 	     attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
 		goto error;
 
 	/* Make sure caller can chgrp. */
 	if ((ia_valid & ATTR_GID) &&
-	    (current->fsuid != inode->i_uid ||
+	    (current_fsuid() != inode->i_uid ||
 	    (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid)) &&
 	    !capable(CAP_CHOWN))
 		goto error;
 
 	/* Make sure a caller can chmod. */
 	if (ia_valid & ATTR_MODE) {
-		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+		if (!is_owner_or_cap(inode))
 			goto error;
 		/* Also check the setgid bit! */
 		if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
@@ -52,8 +51,8 @@ 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 (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
+	if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) {
+		if (!is_owner_or_cap(inode))
 			goto error;
 	}
 fine:
@@ -104,12 +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;
@@ -117,18 +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;
@@ -137,24 +156,25 @@ 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;
 
+	error = security_inode_setattr(dentry, attr);
+	if (error)
+		return error;
+
 	if (ia_valid & ATTR_SIZE)
 		down_write(&dentry->d_inode->i_alloc_sem);
 
 	if (inode->i_op && inode->i_op->setattr) {
-		error = security_inode_setattr(dentry, attr);
-		if (!error)
-			error = inode->i_op->setattr(dentry, attr);
+		error = inode->i_op->setattr(dentry, attr);
 	} else {
 		error = inode_change_ok(inode, attr);
-		if (!error)
-			error = security_inode_setattr(dentry, attr);
 		if (!error) {
 			if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
 			    (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid))
-				error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
+				error = vfs_dq_transfer(inode, attr) ?
+					-EDQUOT : 0;
 			if (!error)
 				error = inode_setattr(inode, attr);
 		}