Re: [PATCH] arm64: bpf: fix buffer pointer

[Z Lim]

On Wed, Nov 18, 2015 at 1:07 PM, Shi, Yang <yang.shi@xxxxxxxxxx> wrote:
> On 11/18/2015 12:56 AM, Zi Shen Lim wrote:
>>                 emit_a64_mov_i64(r3, size, ctx);
>> -               emit(A64_ADD_I(1, r4, fp, MAX_BPF_STACK), ctx);
>> +               emit(A64_SUB_I(1, r4, fp, STACK_SIZE), ctx);
>
>
> Should not it sub MAX_BPF_STACK?

No, if it's at (BPF_FP - MAX_BPF_STACK), we'll be writing into the BPF
stack area, which should only be used by the BPF program.

> If you sub STACK_SIZE here, the buffer pointer will point to bottom of the
> reserved area.

Yes, that's the idea. The buffer is allocated in here. Right now we're
using this "reserved" space for this buffer only.

>
> You stack layout change also shows this:
>
> +        *                        +-----+ <= (BPF_FP - MAX_BPF_STACK)
> +        *                        |RSVD | JIT scratchpad
> +        * current A64_SP =>      +-----+ <= (BPF_FP - STACK_SIZE)

Yes, this diagram reflects the code and intention.


Thanks for reviewing, we definitely need more of these :)
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