On 8/2/16 8:50 AM, Henry Jensen wrote:
> Hello,
>
> is there any new status? We are meanwhile at kernel 4.4.16 LTS and
> ecryptfs is still broken there.
The revert and the fix below, plus Tyler's cleanup, landed in 4.7. Both
were tagged for inclusion in -stable but haven't landed there yet. I'm
afraid that's the limit of my tracking of it.
-Jeff
> Regards,
>
> Henry
>
>
> On Thu, 7 Jul 2016 20:46:34 -0400
> Jeff Mahoney <jeffm@xxxxxxxx> wrote:
>
>> On 7/7/16 7:20 PM, Tyler Hicks wrote:
>>> On 07/05/2016 04:32 PM, jeffm@xxxxxxxx wrote:
>>>> From: Jeff Mahoney <jeffm@xxxxxxxx>
>>>>
>>>> There are legitimate reasons to disallow mmap on certain files, notably
>>>> in sysfs or procfs. We shouldn't emulate mmap support on file systems
>>>> that don't offer support natively.
>>>>
>>>> Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx>
>>>> ---
>>>> fs/ecryptfs/file.c | 16 +++++++++++++++-
>>>> 1 file changed, 15 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
>>>> index 7000b96..4aaa656 100644
>>>> --- a/fs/ecryptfs/file.c
>>>> +++ b/fs/ecryptfs/file.c
>>>> @@ -169,6 +169,20 @@ out:
>>>> return rc;
>>>> }
>>>>
>>>> +
>>>> +static int ecryptfs_mmap(struct file *file, struct vm_area_struct *vma)
>>>> +{
>>>> + struct dentry *dentry = ecryptfs_dentry_to_lower(file_dentry(file));
>>>
>>> This should be:
>>>
>>> struct file *lower_file = ecryptfs_file_to_lower(file);
>>>
>>>> + /*
>>>> + * Don't allow mmap on top of file systems that don't support it
>>>> + * natively. If FILESYSTEM_MAX_STACK_DEPTH > 2 or ecryptfs
>>>> + * allows recursive mounting, this will need to be extended.
>>>> + */
>>>> + if (!d_inode(dentry)->i_fop->mmap)
>>>
>>> and then:
>>>
>>> if (!lower_file->f_op->mmap)
>>>
>>>
>>> I'll make these simple changes, add stable to cc in the patch tags, and
>>> push to Linus.
>>
>> Oh, whoops. Yeah, that's better.
>>
>> Thanks,
>>
>> -Jeff
>>
>>> Thanks again!
>>>
>>> Tyler
>>>
>>>> + return -ENODEV;
>>>> + return generic_file_mmap(file, vma);
>>>> +}
>>>> +
>>>> /**
>>>> * ecryptfs_open
>>>> * @inode: inode speciying file to open
>>>> @@ -403,7 +417,7 @@ const struct file_operations ecryptfs_main_fops = {
>>>> #ifdef CONFIG_COMPAT
>>>> .compat_ioctl = ecryptfs_compat_ioctl,
>>>> #endif
>>>> - .mmap = generic_file_mmap,
>>>> + .mmap = ecryptfs_mmap,
>>>> .open = ecryptfs_open,
>>>> .flush = ecryptfs_flush,
>>>> .release = ecryptfs_release,
>>>>
>>>
>>>
>>
>>
>> --
>> Jeff Mahoney
>> SUSE Labs
>>
>
--
Jeff Mahoney
SUSE Labs
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