linux-kernel - Re: [Xen-devel] [PATCH v3 0/2] Clear .bss for VP guests

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: <56D02EAA.4090200@citrix.com>
Date:	Fri, 26 Feb 2016 11:53:30 +0100
From:	Roger Pau Monné <roger.pau@...rix.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<konrad.wilk@...cle.com>, <david.vrabel@...rix.com>
CC:	<andrew.cooper3@...rix.com>, <linux-kernel@...r.kernel.org>,
	<mcgrof@...nel.org>, <brgerst@...il.com>,
	<xen-devel@...ts.xenproject.org>
Subject: Re: [Xen-devel] [PATCH v3 0/2] Clear .bss for VP guests

El 25/2/16 a les 16:16, Boris Ostrovsky ha escrit:
> PV guests need to have their .bss zeroed out since it is not guaranteed
> to be cleared by Xen's domain builder

I guess I'm missing something, but elf_load_image (in libelf-loader.c)
seems to be able to clear segments (it will zero the memory between
p_paddr + p_filesz and p_paddr + p_memsz) while loading the ELF into
memory, so if the program headers are correctly setup the .bss should be
zeroed out AFAICT.

Roger.