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

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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.