netdev - RE: [PATCH bpf 2/3] bpf: add bpf_probe_read_{user, kernel}_str() to do_refine_retval

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Message-ID: <5ebd70394430_7d272b1d03c705c47c@john-XPS-13-9370.notmuch>
Date:   Thu, 14 May 2020 09:22:17 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>, ast@...nel.org
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        torvalds@...ux-foundation.org, mhiramat@...nel.org,
        brendan.d.gregg@...il.com, hch@....de, john.fastabend@...il.com,
        yhs@...com, Daniel Borkmann <daniel@...earbox.net>
Subject: RE: [PATCH bpf 2/3] bpf: add bpf_probe_read_{user, kernel}_str() to
 do_refine_retval_range

Daniel Borkmann wrote:
> Given bpf_probe_read{,str}() BPF helpers are now only available under
> CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE, we need to add the drop-in
> replacements of bpf_probe_read_{kernel,user}_str() to do_refine_retval_range()
> as well to avoid hitting the same issue as in 849fa50662fbc ("bpf/verifier:
> refine retval R0 state for bpf_get_stack helper").
> 
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> Cc: John Fastabend <john.fastabend@...il.com>
> Cc: Yonghong Song <yhs@...com>
> ---

Acked-by: John Fastabend <john.fastabend@...il.com>