Indirect stack access evaluation #77
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Teach analyzer to evaluate indirect stack access when computing the
array of BpfState objects.
This allows to track stack loads and stores done through a register
other than r10. For example:
*(u64 *)(r1 +0) = r8
If at this point r1 = fp-24, then the value of r8 is written there. So
far bpfvv only could detect this from verifier-provided value
changes. Now it actually checks for the value of r1 at the point of a
store, and can detect a write to fp-24 even if value expression is
absent from the log.
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Teach analyzer to evaluate indirect stack access when computing the
array of BpfState objects.
This allows to track stack loads and stores done through a register
other than r10. For example:
If at this point r1 = fp-24, then the value of r8 is written there. So
far bpfvv only could detect this from verifier-provided value
changes. Now it actually checks for the value of r1 at the point of a
store, and can detect a write to fp-24 even if value expression is
absent from the log.
Closes #28