linux-kernel - Re: [-mm patch] UNION

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]

Message-ID: <20070220151356.GA19239@filer.fsl.cs.sunysb.edu>
Date:	Tue, 20 Feb 2007 10:13:56 -0500
From:	Josef Sipek <jsipek@....cs.sunysb.edu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, unionfs@...esystems.org
Subject: Re: [-mm patch] UNION_FS must depend on SLAB

On Tue, Feb 20, 2007 at 08:37:34AM +0200, Pekka Enberg wrote:
> On 2/20/07, Adrian Bunk <bunk@...sta.de> wrote:
> >  CC      fs/unionfs/copyup.o
> >/home/bunk/linux/kernel-2.6/linux-2.6.20-mm2/fs/unionfs/copyup.c: In 
> >function 'create_parents_named':
> >/home/bunk/linux/kernel-2.6/linux-2.6.20-mm2/fs/unionfs/copyup.c:620: 
> >error: 'malloc_sizes' undeclared (first use in this function)
> >/home/bunk/linux/kernel-2.6/linux-2.6.20-mm2/fs/unionfs/copyup.c:620: 
> >error: (Each undeclared identifier is reported only once
> >/home/bunk/linux/kernel-2.6/linux-2.6.20-mm2/fs/unionfs/copyup.c:620: 
> >error: for each function it appears in.)
> >make[3]: *** [fs/unionfs/copyup.o] Error 1
> 
> Hmm, why is unionfs playing around with malloc_sizes in the first place? 
> Jeff?

The code is in lookup.c:

if (oldsize) {
	int minsize = malloc_sizes[0].cs_size;

	if (!newsize || ((oldsize < newsize) && (newsize > minsize))) {
		kfree(info->lower_paths);
		info->lower_paths = NULL;
	}
}

That's the only user of malloc_sizes. It is supposed to be an optimization -
we get the smallest sized piece of memory even if we don't need all of it.
This way we don't reallocate & memcpy needlessly.

Josef "Jeff" Sipek.

-- 
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like
that.
		- Linus Torvalds
-
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/