linux-kernel - Re: Warning and BUG with btrfs and corrupted image

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:	Thu, 5 Feb 2009 10:02:29 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Christoph Hellwig <hch@...radead.org>,
	Eric Sesterhenn <snakebyte@....de>,
	Chris Mason <chris.mason@...cle.com>,
	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: Warning and BUG with btrfs and corrupted image


> > > CONFIG_*_DEBUG means include *debug* code there to help developers,
> > > including adding additional failure tests into the kernel. Besides,
> > > which bit of "don't turn it on unless you are an XFS developer"
> > > don't you understand?
> > 
> > Yes, but DEBUG code is normally to help debugging, not to crash
> > kernels.
> 
> Crashing the kernel at exactly the point a problem is detected
> is often the simplest way of debugging the problem.
> 
> e.g. CONFIG_VM_DEBUG=y turns on VM_BUG_ON() which crashes the kernel
> whenever it detects something wrong. Do I turn it on? Yes. Do i

That's different. User is not supposed to be able to trigger
VM_BUG_ON().

> complain about it when I hit a VM_BUG_ON()? No, I report the
> bug and move on. If you turn on a DEBUG option, then you are
> asking the system to behave in a way useful to a developer,
> not an end user. That includes panicing when something wrong
> is detected.

Imagine vm going panic() on mkdir("/lost+found")...
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
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/