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Message-ID: <bda042e0-8054-41f3-5df6-c39ad424cde2@oracle.com> Date: Mon, 29 Aug 2022 09:10:10 -0500 From: john.p.donnelly@...cle.com To: Florian Westphal <fw@...len.de> Cc: netfilter-devel@...r.kernel.org, syzkaller@...glegroups.com, george.kennedy@...cle.com, vegard.nossum@...cle.com, bridge@...ts.linux-foundation.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com> Subject: Re: [PATCH nf] netfilter: ebtables: reject blobs that don't provide all entry points On 8/29/22 9:03 AM, Florian Westphal wrote: > john.p.donnelly@...cle.com <john.p.donnelly@...cle.com> wrote: >> On 8/20/22 12:35 PM, Florian Westphal wrote: >>> For some reason ebtables reject blobs that provide entry points that are >>> not supported by the table. >>> >>> What it should instead reject is the opposite, i.e. rulesets that >>> DO NOT provide an entry point that is supported by the table. >>> >>> t->valid_hooks is the bitmask of hooks (input, forward ...) that will >>> see packets. So, providing an entry point that is not support is >>> harmless (never called/used), but the reverse is NOT, this will cause >>> crash because the ebtables traverser doesn't expect a NULL blob for >>> a location its receiving packets for. >>> >>> Instead of fixing all the individual checks, do what iptables is doing and >>> reject all blobs that doesn't provide the expected hooks. >>> >>> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") >>> Reported-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com> >>> Signed-off-by: Florian Westphal <fw@...len.de> >> >> Hi, >> >> Could you please add the panic stack mentioned above and syzkaller >> reproducer ID to the commit text ? > > I did not see a reproducer ID. What ended up in the tree is this: > > https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7997eff82828304b780dc0a39707e1946d6f1ebf__;!!ACWV5N9M2RV99hQ!JxonjgQUi7Mbcd-ouxRwPgu8Jwl6ej2rO4pTvYMtteWexclV5-hciu9e5rgtkXoB7dyAdLCyZ4EQ9HQj$ Thank you !
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