On Mon, Sep 7, 2020 at 3:04 PM Daniel Borkmann wrote:
>
> Bryce reported that he saw the following with:
>
> 0: r6 = r1
> 1: r1 = 12
> 2: r0 = *(u16 *)skb[r1]
>
> The xlated sequence was incorrectly clobbering r2 with pointer
> value of r6 ...
>
> 0: (bf) r6 = r1
> 1: (b7) r1 = 12
>
Bryce reported that he saw the following with:
0: r6 = r1
1: r1 = 12
2: r0 = *(u16 *)skb[r1]
The xlated sequence was incorrectly clobbering r2 with pointer
value of r6 ...
0: (bf) r6 = r1
1: (b7) r1 = 12
2: (bf) r1 = r6
3: (bf) r2 = r1
4: (85) call bpf_skb_load_helper_16_no_ca
