From: stranche@codeaurora.org
To: netfilter-devel@vger.kernel.org
Cc: subashab@codeaurora.org
Subject: Update on UAF in ip6_do_table on 4.19.X kernel
Date: Mon, 20 Jan 2020 15:36:46 -0700 [thread overview]
Message-ID: <a714cb7a671411196557ccae56d1395b@codeaurora.org> (raw)
Hi all,
Following up on the thread we submitted earlier here:
https://lore.kernel.org/netfilter-devel/44a69247-87bd-905d-bd1c-e9dcb5027641@gmail.com/
In short, we've seen that on the 4.19.X kernels, there is a crash in the
Xtables framework where the jumpstack can potentially be used after it
is freed. We've narrowed down the cause of this crash to a single patch:
f31e5f1a891f ("netfilter: unlock xt_table earlier in __do_replace"); if
this patch is reverted, the crash is no longer seen.
It seems that the xt_table lock is needed for get_old_counters() to be
synchronized properly with the rest of the framework.
Thanks,
Sean
reply other threads:[~2020-01-20 22:36 UTC|newest]
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