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Out of bounds memory load, store - PREVAIL assumes context is non-null but uBPF sets context to null #279

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tobashi opened this issue Jun 9, 2023 · 0 comments
Open

Out of bounds memory load, store - PREVAIL assumes context is non-null but uBPF sets context to null #279

tobashi opened this issue Jun 9, 2023 · 0 comments

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@tobashi
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tobashi commented Jun 9, 2023

We generated programs which result in an out of bounds memory load and store but is verified by PREVAIL.

mov64 r0, 0x0
arsh64 r0, r5
ldxw r3, [r1+0x1]
mov64 r4, r1
exit

I think we concluded that this is an issue with uBPF rather than PREVAIL, where ctx is null
vbpf/ebpf-verifier#492
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