[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH] xen/memory: Reject out-of-range resource 'frame' values
On 29.01.2021 10:47, Andrew Cooper wrote: > On 29/01/2021 09:40, Jan Beulich wrote: >> On 29.01.2021 10:32, Andrew Cooper wrote: >>> What's the likelihood that you'll choose to backport this? >> Didn't consider this aspect yet. I think I wouldn't have picked >> it without anyone asking for it to be backported. >> >>> I can extend it if needs be. >> Well, if that deletion of code gets committed in time, then of >> course there's no real need to fiddle with it here. > > This specific patch fixes a real bug on arm32 which will cause unsigned > long + unsigned int to truncate together and permit certain values. Why Arm32 only? Looking at current staging, there's no overflow check at all on the grant part of the path. A suitably large 64-bit "frame" will allow the same behavior on 64-bit (wrapping around through zero), afaict. Jan
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