linux-kernel - Re: [PATCH v3 00/21] kdump, vmcore: support mmap() on /proc/vmcore

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, 21 Mar 2013 00:14:43 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
Cc:	akpm@...ux-foundation.org, vgoyal@...hat.com, cpw@....com,
	kumagai-atsushi@....nes.nec.co.jp, lisa.mitchell@...com,
	heiko.carstens@...ibm.com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, zhangyanfei@...fujitsu.com
Subject: Re: [PATCH v3 00/21] kdump, vmcore: support mmap() on /proc/vmcore

HATAYAMA Daisuke <d.hatayama@...fujitsu.com> writes:

> The breakage was caused by the introduction of new NT_VMCORE_PAD to
> "VMCOREINFO" name, except for which it worked fine. But it will be
> dropped in the next version. It'll be no problem for some time.
>
> The breakage was caused by makedumpfile itself due to the bug that it
> had so far seen note type only, not note name. It was possible to
> avoid the breakage by choosing another note name but I didn't do
> it. This topic will probably arise when some kind of new note types
> are needed.

Yes.  Not ignoring unknown note types is a a deficiency in makedumpfile.
And definitely not something to keep us from introducing new note types.

It should be noted that a common use of /proc/vmcore is to do:
cp /proc/vmcore /somepath/core

gdb /somepath/core

makedumpfile is just an optimization on that for people who want to
write a smaller file.

Eric
--
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/