linux-kernel - Re: Boot failure with ext2 and initrds

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: <20061129013922.053482f9.akpm@osdl.org>
Date:	Wed, 29 Nov 2006 01:39:22 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	Mingming Cao <cmm@...ibm.com>, Hugh Dickins <hugh@...itas.com>,
	Mel Gorman <mel@...net.ie>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	linux-kernel@...r.kernel.org,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Boot failure with ext2 and initrds

On Wed, 29 Nov 2006 09:20:24 +0000
Russell King <rmk+lkml@....linux.org.uk> wrote:

> What I'm looking for is confirmation of the semantics of
> find_next_zero_bit()

What are the existing semantics?  I see no documentation in any of the
architectures I've looked at.  That's my point.

>From a quick read of fs/ext2/balloc.c

	ext2_find_next_zero_bit(base, size, offset)

appears to expect that base is the start of the memory buffer, size is the
number of bits at *base and offset is the bit at which to start the search,
relative to base.  If a zero bit is found it will return the offset of that
bit relative to base.  It will return some number greater than `size' if no
zero-bit was found.  

Whether that's how all the implementors interpreted it is anyone's guess. 
Presumably the architectures all do roughly the same thing.

> <extremely frustrated>

Well likewise.  It appears that nobody (and about 20 people have
implemented these things) could be bothered getting off ass and documenting
the pathetic thing.

-
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/