bpf: misleading spec_v1 check on variable-offset stack read?

[Luis Gerhorst]

Hello,

is there any way to introduce variable-offset (stack) pointers without 
using pointer arithmetic (BPF_ADD/SUB)? If yes, I believe this is a 
security issue because these can be used in stack writes. If not, I 
think the patch sent in reply to this mail should be applied. (I was not 
able to find any indication that the former is the case.)

Best regards,
Luis

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