On 07/09/2019 05:32 AM, Andrii Nakryiko wrote:
> When backtracking instructions to propagate precision bit for registers
> and stack slots, one class of instructions (BPF_ST) weren't handled
> causing extra stack slots to be propagated into parent state. Parent
> state might not have that much stack allocated, though, which causes
> warning on invalid stack slot usage.
>
> This patch adds handling of BPF_ST instructions:
>
> BPF_MEM | <size> | BPF_ST: *(size *) (dst_reg + off) = imm32
>
> Reported-by: syzbot+4da3ff23081bafe74fc2@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: b5dc0163d8fd ("bpf: precise scalar_value tracking")
> Cc: Alexei Starovoitov <ast@xxxxxx>
> Signed-off-by: Andrii Nakryiko <andriin@xxxxxx>
Applied, thanks!
