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

To: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, <konrad.wilk@xxxxxxxxxx>, <david.vrabel@xxxxxxxxxx>
From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Date: Fri, 26 Feb 2016 11:53:30 +0100
Cc: andrew.cooper3@xxxxxxxxxx, mcgrof@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, brgerst@xxxxxxxxx
Delivery-date: Fri, 26 Feb 2016 10:53:41 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

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.



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