linux-kernel - Re: Oops in minixfs

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: <CAEKwDSC0kEATJ2VoKR7HvE+V6rizKm+r0+-p2=vQ=m0FAFa0YQ@mail.gmail.com>
Date:	Tue, 16 Aug 2011 23:12:27 -0400
From:	Bob Copeland <me@...copeland.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Josh Boyer <jwboyer@...hat.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: Oops in minixfs_statfs

On Tue, Aug 16, 2011 at 10:18 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> I *think* that what's happening in your case is that we have more blocks
> for block bitmap than we would need to hold all bits.  That would explode
> in exactly such a way, but I'd like to see confirmation; what arguments
> does your count_free() actually get?  The last two arguments, that is...

Sounds like it, Josh posted this output before:

[  516.859103] imap_blocks 7 zmap_blocks 7 firstdatazone c11
log_zone_size 0 max_size 7fffffff magic 4d5a nzones 3001c blocksize:
1000

So there are 7 blocks in the zone bitmap but only 0x3001c - 0xc11 = 193547
zones to allocate, which would fit in 6 blocks.

-- 
Bob Copeland %% www.bobcopeland.com
--
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/