From: Yonghong Song <yhs@fb.com>
To: Daniel Borkmann <daniel@iogearbox.net>, <ast@kernel.org>
Cc: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>,
<torvalds@linux-foundation.org>, <mhiramat@kernel.org>,
<brendan.d.gregg@gmail.com>, <hch@lst.de>,
<john.fastabend@gmail.com>
Subject: Re: [PATCH bpf 2/3] bpf: add bpf_probe_read_{user, kernel}_str() to do_refine_retval_range
Date: Thu, 14 May 2020 10:41:31 -0700 [thread overview]
Message-ID: <a831c339-1f30-30a2-b83b-4c7bc2500f7c@fb.com> (raw)
In-Reply-To: <20200514161607.9212-3-daniel@iogearbox.net>
On 5/14/20 9:16 AM, 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@iogearbox.net>
> Cc: John Fastabend <john.fastabend@gmail.com>
> Cc: Yonghong Song <yhs@fb.com>
LGTM.
Acked-by: Yonghong Song <yhs@fb.com>
next prev parent reply other threads:[~2020-05-14 17:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-14 16:16 [PATCH bpf 0/3] Restrict bpf_probe_read{,str}() and bpf_trace_printk()'s %s Daniel Borkmann
2020-05-14 16:16 ` [PATCH bpf 1/3] bpf: restrict bpf_probe_read{,str}() only to archs where they work Daniel Borkmann
2020-05-14 18:57 ` Linus Torvalds
2020-05-15 0:06 ` Masami Hiramatsu
2020-05-14 16:16 ` [PATCH bpf 2/3] bpf: add bpf_probe_read_{user, kernel}_str() to do_refine_retval_range Daniel Borkmann
2020-05-14 16:22 ` John Fastabend
2020-05-14 17:41 ` Yonghong Song [this message]
2020-05-14 16:16 ` [PATCH bpf 3/3] bpf: restrict bpf_trace_printk()'s %s usage and add %psK, %psU specifier Daniel Borkmann
2020-05-14 18:10 ` Yonghong Song
2020-05-14 21:05 ` Daniel Borkmann
2020-05-14 16:58 ` [PATCH bpf 0/3] Restrict bpf_probe_read{,str}() and bpf_trace_printk()'s %s Christoph Hellwig
2020-05-14 19:54 ` Daniel Borkmann
2020-05-14 19:58 ` Christoph Hellwig
2020-05-14 21:10 ` Daniel Borkmann
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