linux-kernel - Re: [RFC 06/32] isofs: fix timestamps beyond 2027

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Date:	Sat, 31 May 2014 01:47:19 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Arnd Bergmann <arnd@...db.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	"Joseph S. Myers" <joseph@...esourcery.com>,
	John Stultz <john.stultz@...aro.org>,
	Christoph Hellwig <hch@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ley Foon Tan <lftan@...era.com>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: [RFC 06/32] isofs: fix timestamps beyond 2027

On 05/31/2014 12:59 AM, Geert Uytterhoeven wrote:
> On Fri, May 30, 2014 at 10:01 PM, Arnd Bergmann <arnd@...db.de> 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 adds a cast to 'u8' for the year number, which should extend
>> the shelf life of the file system until 2155.
> 
> Oops, the CD archive of my scanned Napoleon manuscripts no longer has the
> right file date? ;-)
> 
> Are there any practical uses of representating dates between 1772 and 1900
> on CD/DVD?
> 

Unlikely, furthermore, the spec explicitly states that the number is
unsigned (ref: ECMA-119, 2nd ed, 9.1.5 which specifies that the numbers
are "recorded according to 7.1.1"; 7.1.1 specifies "8-bit unsigned
numerical values").

	-hpa


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