From: giladreti <gilad.reti@gmail.com>
To: bpf@vger.kernel.org, Yonghong Song <yhs@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] Signed-off-by: giladreti <gilad.reti@gmail.com>
Date: Mon, 11 Jan 2021 17:31:23 +0200 [thread overview]
Message-ID: <20210111153123.GA423936@ubuntu> (raw)
Added support for pointer to mem register spilling, to allow the verifier
to track pointer to valid memory addresses. Such pointers are returned
for example by a successful call of the bpf_ringbuf_reserve helper.
This patch was suggested as a solution by Yonghong Song.
---
kernel/bpf/verifier.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 17270b8404f1..36af69fac591 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -2217,6 +2217,8 @@ static bool is_spillable_regtype(enum bpf_reg_type type)
case PTR_TO_RDWR_BUF:
case PTR_TO_RDWR_BUF_OR_NULL:
case PTR_TO_PERCPU_BTF_ID:
+ case PTR_TO_MEM:
+ case PTR_TO_MEM_OR_NULL:
return true;
default:
return false;
--
2.27.0
next reply other threads:[~2021-01-11 15:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-11 15:31 giladreti [this message]
2021-01-11 15:51 ` [PATCH] Signed-off-by: giladreti <gilad.reti@gmail.com> Marek Behún
2021-01-11 15:55 ` Daniel Borkmann
2021-01-11 16:03 ` Gilad Reti
2021-01-11 20:39 ` Andrii Nakryiko
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