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Wong" To: "Theodore Ts'o" , matthew.garrett@nebula.com, yuchao0@huawei.com, ard.biesheuvel@linaro.org, josef@toxicpanda.com, clm@fb.com, adilger.kernel@dilger.ca, viro@zeniv.linux.org.uk, jack@suse.com, dsterba@suse.com, jaegeuk@kernel.org, jk@ozlabs.org, reiserfs-devel@vger.kernel.org, linux-efi@vger.kernel.org, devel@lists.orangefs.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, linux-mm@kvack.org, linux-nilfs@vger.kernel.org, linux-mtd@lists.infradead.org, ocfs2-devel@oss.oracle.com, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org Subject: Re: [PATCH 1/6] mm/fs: don't allow writes to immutable files Message-ID: <20190620221306.GD5375@magnolia> References: <156022836912.3227213.13598042497272336695.stgit@magnolia> <156022837711.3227213.11787906519006016743.stgit@magnolia> <20190620215212.GG4650@mit.edu> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190620215212.GG4650@mit.edu> User-Agent: Mutt/1.9.4 (2018-02-28) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9294 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=570 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906200158 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190620_151324_300370_C0C88361 X-CRM114-Status: GOOD ( 21.17 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On Thu, Jun 20, 2019 at 05:52:12PM -0400, Theodore Ts'o wrote: > On Mon, Jun 10, 2019 at 09:46:17PM -0700, Darrick J. Wong wrote: > > From: Darrick J. Wong > > > > The chattr manpage has this to say about immutable files: > > > > "A file with the 'i' attribute cannot be modified: it cannot be deleted > > or renamed, no link can be created to this file, most of the file's > > metadata can not be modified, and the file can not be opened in write > > mode." > > > > Once the flag is set, it is enforced for quite a few file operations, > > such as fallocate, fpunch, fzero, rm, touch, open, etc. However, we > > don't check for immutability when doing a write(), a PROT_WRITE mmap(), > > a truncate(), or a write to a previously established mmap. > > > > If a program has an open write fd to a file that the administrator > > subsequently marks immutable, the program still can change the file > > contents. Weird! > > > > The ability to write to an immutable file does not follow the manpage > > promise that immutable files cannot be modified. Worse yet it's > > inconsistent with the behavior of other syscalls which don't allow > > modifications of immutable files. > > > > Therefore, add the necessary checks to make the write, mmap, and > > truncate behavior consistent with what the manpage says and consistent > > with other syscalls on filesystems which support IMMUTABLE. > > > > Signed-off-by: Darrick J. Wong > > I note that this patch doesn't allow writes to swap files. So Amir's > generic/554 test will still fail for those file systems that don't use > copy_file_range. I didn't add any IS_SWAPFILE checks here, so I'm not sure to what you're referring? > I'm indifferent as to whether you add a new patch, or include that > change in this patch, but perhaps we should fix this while we're > making changes in these code paths? The swapfile patches should be in a separate patch, which I was planning to work on but hadn't really gotten around to it. --D > - Ted ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/