linux-kernel - Re: [PATCH] Avoid truncating to 'long' in ALIGN() macro

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 25 Nov 2006 15:09:38 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	David Miller <davem@...emloft.net>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org,
	openib-general@...nib.org, tom@...ngridcomputing.com
Subject: Re: [PATCH] Avoid truncating to 'long' in ALIGN() macro

 > You would need to also cast the constants with typeof() to.

Why?  I'm not much of a C language lawyer, but I would have thought
that in something like

	(x) + _a - 1

the "1" will be promoted to the type of the rest of the expression
without any explicit cast.  I tested the unsigned long/unsigned int
and u64/int cases of ALIGN(), and my macro with typeof() works for
both of those cases at least.

 > But yes, given the array sizing case in the neighbour code,
 > perhaps we can use your original patch for now.  Feel free
 > to push that to Linus.

akpm is CC'ed on this thread.  Andrew, are you going to pick this up?

Thanks,
  Roland
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/