linux-kernel - Re: [PATCH v3] fs/fcntl: restore checking against COMPAT_LOFF_T_MAX for F

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Date:   Tue, 14 Nov 2017 22:25:23 +0300
From:   Vitaly Lipatov <lav@...rsoft.ru>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     wine-patches <wine-patches@...ehq.org>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v3] fs/fcntl: restore checking against COMPAT_LOFF_T_MAX
 for F_GETLK64

Jeff Layton писал 14.11.17 22:12:
...
> Wait...
> 
> Does this do anything at all in the case where you pass in
> COMPAT_LOFF_T_MAX? l_start and l_len are either off_t or loff_t
> (depending on arch).
> 
> Either one will fit in the F_GETLK64/F_OFD_GETLK struct, so I don't see
> a need to check here.
I am not sure, can off_t be bigger than loff_t ?
If not, we have just skip checking against COMPAT_LOFF_T_MAX.

...
>> @@ -644,7 +644,7 @@ COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, 
>> unsigned int, cmd,
>>  		err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock);
>>  		if (err)
>>  			break;
>> -		err = fixup_compat_flock(&flock);
>> +		err = fixup_compat_flock(&flock, COMPAT_LOFF_T_MAX);
>>  		if (err)
>>  			return err;
>>  		err = put_compat_flock64(&flock, compat_ptr(arg));
> 
> Maybe a simpler fix would be to just remove the fixup_compat_flock call
> above?
> 
> PS: if you send any more patches, please cc Christoph. He did the
Ok.

-- 
С уважением,
Виталий Липатов,
Etersoft