[GFS2] don't call permission()

GFS2 calls permission() to verify permissions after locks on the files
have been taken.

For this it's sufficient to call gfs2_permission() instead.  This
results in the following changes:

  - IS_RDONLY() check is not performed
  - IS_IMMUTABLE() check is not performed
  - devcgroup_inode_permission() is not called
  - security_inode_permission() is not called

IS_RDONLY() should be unnecessary anyway, as the per-mount read-only
flag should provide protection against read-only remounts during
operations.  do_gfs2_set_flags() has been fixed to perform
mnt_want_write()/mnt_drop_write() to protect against remounting
read-only.

IS_IMMUTABLE has been added to gfs2_permission()

Repeating the security checks seems to be pointless, as they don't
normally change, and if they do, it's independent of the filesystem
state.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

4 files changed, 30 insertions, 13 deletions

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 09453d057e41..caf409083354 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -504,7 +504,7 @@ struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
         }
 
         if (!is_root) {
-                error = permission(dir, MAY_EXEC, NULL);
+                error = gfs2_permission(dir, MAY_EXEC);
                 if (error)
                         goto out;
         }
@@ -667,7 +667,7 @@ static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
 {
         int error;
 
-        error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
+        error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
         if (error)
                 return error;
 
@@ -1134,7 +1134,7 @@ int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
         if (IS_APPEND(&dip->i_inode))
                 return -EPERM;
 
-        error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
+        error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
         if (error)
                 return error;
 
diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index 580da454b38f..04e9fef3f99a 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -91,6 +91,7 @@ int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
                 struct gfs2_inode *ip);
 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
                    const struct gfs2_inode *ip);
+int gfs2_permission(struct inode *inode, int mask);
 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to);
 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len);
 int gfs2_glock_nq_atime(struct gfs2_holder *gh);
diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index 0ff512a11925..1737af98a420 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -15,6 +15,7 @@
 #include <linux/uio.h>
 #include <linux/blkdev.h>
 #include <linux/mm.h>
+#include <linux/mount.h>
 #include <linux/fs.h>
 #include <linux/gfs2_ondisk.h>
 #include <linux/ext2_fs.h>
@@ -220,10 +221,14 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
         int error;
         u32 new_flags, flags;
 
-        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+        error = mnt_want_write(filp->f_path.mnt);
         if (error)
                 return error;
 
+        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+        if (error)
+                goto out_drop_write;
+
         flags = ip->i_di.di_flags;
         new_flags = (flags & ~mask) | (reqflags & mask);
         if ((new_flags ^ flags) == 0)
@@ -242,7 +247,7 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
             !capable(CAP_LINUX_IMMUTABLE))
                 goto out;
         if (!IS_IMMUTABLE(inode)) {
-                error = permission(inode, MAY_WRITE, NULL);
+                error = gfs2_permission(inode, MAY_WRITE);
                 if (error)
                         goto out;
         }
@@ -272,6 +277,8 @@ out_trans_end:
         gfs2_trans_end(sdp);
 out:
         gfs2_glock_dq_uninit(&gh);
+out_drop_write:
+        mnt_drop_write(filp->f_path.mnt);
         return error;
 }
 
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index 2686ad4c0029..1e252dfc5294 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -163,7 +163,7 @@ static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
         if (error)
                 goto out;
 
-        error = permission(dir, MAY_WRITE | MAY_EXEC, NULL);
+        error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
         if (error)
                 goto out_gunlock;
 
@@ -669,7 +669,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
                         }
                 }
         } else {
-                error = permission(ndir, MAY_WRITE | MAY_EXEC, NULL);
+                error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
                 if (error)
                         goto out_gunlock;
 
@@ -704,7 +704,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
         /* Check out the dir to be renamed */
 
         if (dir_rename) {
-                error = permission(odentry->d_inode, MAY_WRITE, NULL);
+                error = gfs2_permission(odentry->d_inode, MAY_WRITE);
                 if (error)
                         goto out_gunlock;
         }
@@ -891,7 +891,7 @@ static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
  * Returns: errno
  */
 
-static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
+int gfs2_permission(struct inode *inode, int mask)
 {
         struct gfs2_inode *ip = GFS2_I(inode);
         struct gfs2_holder i_gh;
@@ -905,13 +905,22 @@ static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
                 unlock = 1;
         }
 
-        error = generic_permission(inode, mask, gfs2_check_acl);
+        if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
+                error = -EACCES;
+        else
+                error = generic_permission(inode, mask, gfs2_check_acl);
         if (unlock)
                 gfs2_glock_dq_uninit(&i_gh);
 
         return error;
 }
 
+static int gfs2_iop_permission(struct inode *inode, int mask,
+                               struct nameidata *nd)
+{
+        return gfs2_permission(inode, mask);
+}
+
 static int setattr_size(struct inode *inode, struct iattr *attr)
 {
         struct gfs2_inode *ip = GFS2_I(inode);
@@ -1141,7 +1150,7 @@ static int gfs2_removexattr(struct dentry *dentry, const char *name)
 }
 
 const struct inode_operations gfs2_file_iops = {
-        .permission = gfs2_permission,
+        .permission = gfs2_iop_permission,
         .setattr = gfs2_setattr,
         .getattr = gfs2_getattr,
         .setxattr = gfs2_setxattr,
@@ -1160,7 +1169,7 @@ const struct inode_operations gfs2_dir_iops = {
         .rmdir = gfs2_rmdir,
         .mknod = gfs2_mknod,
         .rename = gfs2_rename,
-        .permission = gfs2_permission,
+        .permission = gfs2_iop_permission,
         .setattr = gfs2_setattr,
         .getattr = gfs2_getattr,
         .setxattr = gfs2_setxattr,
@@ -1172,7 +1181,7 @@ const struct inode_operations gfs2_dir_iops = {
 const struct inode_operations gfs2_symlink_iops = {
         .readlink = gfs2_readlink,
         .follow_link = gfs2_follow_link,
-        .permission = gfs2_permission,
+        .permission = gfs2_iop_permission,
         .setattr = gfs2_setattr,
         .getattr = gfs2_getattr,
         .setxattr = gfs2_setxattr,