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Re: [PATCH 2/2] livepatch: avoid relocations referencing ignored section symbols
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
- Date: Thu, 7 Apr 2022 16:22:06 +0000
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- Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
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- Thread-topic: [PATCH 2/2] livepatch: avoid relocations referencing ignored section symbols
> From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
> Sent: Thursday, March 17, 2022 11:08 AM
> To: xen-devel@xxxxxxxxxxxxxxxxxxxx <xen-devel@xxxxxxxxxxxxxxxxxxxx>
> Cc: Roger Pau Monne <roger.pau@xxxxxxxxxx>; Konrad Rzeszutek Wilk
> <konrad.wilk@xxxxxxxxxx>; Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>; Stefano
> Stabellini <sstabellini@xxxxxxxxxx>; Julien Grall <julien@xxxxxxx>; Bertrand
> Marquis <bertrand.marquis@xxxxxxx>; Volodymyr Babchuk
> <Volodymyr_Babchuk@xxxxxxxx>; Jan Beulich <jbeulich@xxxxxxxx>; Andrew Cooper
> <Andrew.Cooper3@xxxxxxxxxx>; Wei Liu <wl@xxxxxxx>
> Subject: [PATCH 2/2] livepatch: avoid relocations referencing ignored section
> symbols
>
> Track whether symbols belong to ignored sections in order to avoid
> applying relocations referencing those symbols. The address of such
> symbols won't be resolved and thus the relocation will likely fail or
> write garbage to the destination.
>
> Return an error in that case, as leaving unresolved relocations would
> lead to malfunctioning payload code.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Reviewed-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
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