From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: "Theodore Ts'o" <tytso@mit.edu>
Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH 1/8] mm/fs: don't allow writes to immutable files
Date: Sun, 9 Jun 2019 21:41:44 -0700 [thread overview]
Message-ID: <20190610044144.GA1872750@magnolia> (raw)
In-Reply-To: <20190610015145.GB3266@mit.edu>
On Sun, Jun 09, 2019 at 09:51:45PM -0400, Theodore Ts'o wrote:
> On Wed, Apr 17, 2019 at 12:04:33PM -0700, Darrick J. Wong wrote:
> > diff --git a/mm/memory.c b/mm/memory.c
> > index ab650c21bccd..dfd5eba278d6 100644
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@ -2149,6 +2149,9 @@ static vm_fault_t do_page_mkwrite(struct vm_fault *vmf)
> >
> > vmf->flags = FAULT_FLAG_WRITE|FAULT_FLAG_MKWRITE;
> >
> > + if (vmf->vma->vm_file && IS_IMMUTABLE(file_inode(vmf->vma->vm_file)))
> > + return VM_FAULT_SIGBUS;
> > +
> > ret = vmf->vma->vm_ops->page_mkwrite(vmf);
> > /* Restore original flags so that caller is not surprised */
> > vmf->flags = old_flags;
>
> Shouldn't this check be moved before the modification of vmf->flags?
> It looks like do_page_mkwrite() isn't supposed to be returning with
> vmf->flags modified, lest "the caller gets surprised".
Yeah, I think that was a merge error during a rebase... :(
Er ... if you're still planning to take this patch through your tree,
can you move it to above the "vmf->flags = FAULT_FLAG_WRITE..." ?
--D
> - Ted
next prev parent reply other threads:[~2019-06-10 4:41 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-17 19:04 [PATCH v2 0/8] vfs: make immutable files actually immutable Darrick J. Wong
2019-04-17 19:04 ` [PATCH 1/8] mm/fs: don't allow writes to immutable files Darrick J. Wong
2019-04-26 18:17 ` Brian Foster
2019-06-10 1:43 ` Theodore Ts'o
2019-06-10 1:51 ` Theodore Ts'o
2019-06-10 4:41 ` Darrick J. Wong [this message]
2019-06-10 13:14 ` Theodore Ts'o
2019-06-10 16:09 ` Darrick J. Wong
2019-06-10 20:41 ` Theodore Ts'o
2019-06-11 3:26 ` Darrick J. Wong
2019-06-11 4:01 ` Darrick J. Wong
2019-04-17 19:04 ` [PATCH 2/8] xfs: unlock inode when xfs_ioctl_setattr_get_trans can't get transaction Darrick J. Wong
2019-04-26 18:17 ` Brian Foster
2019-04-17 19:04 ` [PATCH 3/8] xfs: flush page mappings as part of setting immutable Darrick J. Wong
2019-04-26 18:18 ` Brian Foster
2019-04-17 19:04 ` [PATCH 4/8] xfs: refactor setflags to use setattr code directly Darrick J. Wong
2019-04-17 19:05 ` [PATCH 5/8] xfs: clean up xfs_merge_ioc_xflags Darrick J. Wong
2019-04-17 19:05 ` [PATCH 6/8] xfs: don't allow most setxattr to immutable files Darrick J. Wong
2019-04-17 19:05 ` [PATCH 7/8] btrfs: don't allow any modifications to an immutable file Darrick J. Wong
2019-04-17 19:05 ` [PATCH 8/8] ext4: " Darrick J. Wong
2019-04-30 15:46 ` [PATCH v2 0/8] vfs: make immutable files actually immutable David Sterba
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