UBIFS: fix oops when R/O file-system is fsync'ed

commit 78530bf7f2559b317c04991b52217c1608d5a58d upstream.

This patch fixes severe UBIFS bug: UBIFS oopses when we 'fsync()' an
file on R/O-mounter file-system. We (the UBIFS authors) incorrectly
thought that VFS would not propagate 'fsync()' down to the file-system
if it is read-only, but this is not the case.

It is easy to exploit this bug using the following simple perl script:

use strict;
use File::Sync qw(fsync sync);

die "File path is not specified" if not defined $ARGV[0];
my $path = $ARGV[0];

open FILE, "<", "$path" or die "Cannot open $path: $!";
fsync(\*FILE) or die "cannot fsync $path: $!";
close FILE or die "Cannot close $path: $!";

Thanks to Reuben Dowle <Reuben.Dowle@navico.com> for reporting about this
issue.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Reported-by: Reuben Dowle <Reuben.Dowle@navico.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 5692cf72b80737e0b87da9a22c58dbe2e52b371b..1a411fd22befd7bc6299b1e8d4d2be8d1ecf6a0f 100644 (file)
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1312,6 +1312,9 @@ int ubifs_fsync(struct file *file, struct dentry *dentry, int datasync)
 
        dbg_gen("syncing inode %lu", inode->i_ino);
 
+       if (inode->i_sb->s_flags & MS_RDONLY)
+               return 0;
+
        /*
         * VFS has already synchronized dirty pages for this inode. Synchronize
         * the inode unless this is a 'datasync()' call.