From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Florian Westphal <fw@strlen.de>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
Pablo Neira Ayuso <pablo@netfilter.org>,
Sasha Levin <sashal@kernel.org>,
netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
bridge@lists.linux-foundation.org, netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 197/371] netfilter: ebtables: CONFIG_COMPAT: reject trailing data after last rule
Date: Thu, 16 Jan 2020 12:21:09 -0500 [thread overview]
Message-ID: <20200116172403.18149-140-sashal@kernel.org> (raw)
In-Reply-To: <20200116172403.18149-1-sashal@kernel.org>
From: Florian Westphal <fw@strlen.de>
[ Upstream commit 680f6af5337c98d116e4f127cea7845339dba8da ]
If userspace provides a rule blob with trailing data after last target,
we trigger a splat, then convert ruleset to 64bit format (with trailing
data), then pass that to do_replace_finish() which then returns -EINVAL.
Erroring out right away avoids the splat plus unneeded translation and
error unwind.
Fixes: 81e675c227ec ("netfilter: ebtables: add CONFIG_COMPAT support")
Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/bridge/netfilter/ebtables.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 35a670ec9077..a1834ad7422c 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -2164,7 +2164,9 @@ static int compat_copy_entries(unsigned char *data, unsigned int size_user,
if (ret < 0)
return ret;
- WARN_ON(size_remaining);
+ if (size_remaining)
+ return -EINVAL;
+
return state->buf_kern_offset;
}
--
2.20.1
prev parent reply other threads:[~2020-01-16 18:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200116172403.18149-1-sashal@kernel.org>
2020-01-16 17:19 ` [PATCH AUTOSEL 4.14 126/371] netfilter: nft_set_hash: fix lookups with fixed size hash on big endian Sasha Levin
2020-01-16 17:21 ` Sasha Levin [this message]
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