Re: [Xen-devel] [PATCH v5 1/4] livepatch/docs: Document .bss not being cleared, and .data potentially having changed values

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.09.16 at 17:48, <konrad.wilk@xxxxxxxxxx> wrote:
> --- a/docs/misc/livepatch.markdown
> +++ b/docs/misc/livepatch.markdown
> @@ -875,6 +875,12 @@ section and the new function will reference the new 
> string in the new
>  
>  This is implemented in the Xen Project hypervisor.
>  
> +Note that the .bss section is only cleared when the ELF payload is uploaded.
> +Subsequent apply/revert/apply operation do no clear the .bss (or reset the
> +.data to what it was when loaded). Hence it is the responsibility of the
> +creator of the payload to reset these values to known good state if they
> +depend on them having certain values at apply/revert states.

Was it, as an alternative, considered to disallow re-applying a
reverted patch without re-uploading?

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel