linux-kernel - Re: [PATCH v2 1/2] isofs: fix timestamps beyond 2027

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Message-ID: <CAK8P3a0ZQA4OFi_SiaxUPnjp0QNqHsc=pQoZSAGOUBUxgXtvgg@mail.gmail.com>
Date:   Thu, 19 Oct 2017 17:29:12 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Jan Kara <jack@...e.cz>
Cc:     y2038 Mailman List <y2038@...ts.linaro.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Anders Larsen <al@...rsen.net>,
        "# 3.4.x" <stable@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] isofs: fix timestamps beyond 2027

On Thu, Oct 19, 2017 at 5:17 PM, Jan Kara <jack@...e.cz> wrote:
> On Thu 19-10-17 16:47:48, Arnd Bergmann wrote:
>> isofs uses a 'char' variable to load the number of years since
>> 1900 for an inode timestamp. On architectures that use a signed
>> char type by default, this results in an invalid date for
>> anything beyond 2027.
>>
>> This changes the function argument to a 'u8' array, which
>> is defined the same way on all architectures, and unambiguously
>> lets us use years until 2155.
>>
>> This should be backported to all kernels that might still be
>> in use by that date.
>>
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ...
>> -int iso_date(char * p, int flag)
>> +int iso_date(u8 *p, int flag)
>>  {
>>       int year, month, day, hour, minute, second, tz;
>>       int crtime;
>>
>> -     year = p[0];
>> +     year = (int)(u8)p[0];
>
> The cast seems unnecessary now?
>

Sorry, I must have rebased the patch incorrectly, this was intended to
be removed
of course.

      Arnd