From: Greg KH <gregkh@linuxfoundation.org>
To: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Cc: stable@vger.kernel.org, bpf@vger.kernel.org,
Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
Pavel Machek <pavel@denx.de>
Subject: Re: [PATCH 4.14 0/4] BPF fixes for CVE-2021-3444 and CVE-2021-3600
Date: Wed, 1 Sep 2021 11:43:05 +0200 [thread overview]
Message-ID: <YS9LKXbcud7he1X5@kroah.com> (raw)
In-Reply-To: <20210830183211.339054-1-cascardo@canonical.com>
On Mon, Aug 30, 2021 at 03:32:07PM -0300, Thadeu Lima de Souza Cascardo wrote:
> The upstream changes necessary to fix these CVEs rely on the presence of JMP32,
> which is not a small backport and brings its own potential set of necessary
> follow-ups.
>
> Daniel Borkmann, John Fastabend and Alexei Starovoitov came up with a fix
> involving the use of the AX register.
>
> This has been tested against the test_verifier in 4.14.y tree and some tests
> specific to the two referred CVEs. The test_bpf module was also tested.
>
> Daniel Borkmann (4):
> bpf: Do not use ax register in interpreter on div/mod
> bpf: fix subprog verifier bypass by div/mod by 0 exception
> bpf: Fix 32 bit src register truncation on div/mod
> bpf: Fix truncation handling for mod32 dst reg wrt zero
>
> include/linux/filter.h | 24 ++++++++++++++++++++++++
> kernel/bpf/core.c | 40 +++++++++++++++-------------------------
> kernel/bpf/verifier.c | 39 +++++++++++++++++++++++++++++++--------
> net/core/filter.c | 9 ++++++++-
> 4 files changed, 78 insertions(+), 34 deletions(-)
>
> --
> 2.30.2
>
All now queued up, thanks.
greg k-h
prev parent reply other threads:[~2021-09-01 9:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-30 18:32 [PATCH 4.14 0/4] BPF fixes for CVE-2021-3444 and CVE-2021-3600 Thadeu Lima de Souza Cascardo
2021-08-30 18:32 ` [PATCH 4.14 1/4] bpf: Do not use ax register in interpreter on div/mod Thadeu Lima de Souza Cascardo
2021-09-01 11:30 ` Greg KH
2021-09-01 11:31 ` Greg KH
2021-09-01 12:09 ` Thadeu Lima de Souza Cascardo
2021-08-30 18:32 ` [PATCH 4.14 2/4] bpf: fix subprog verifier bypass by div/mod by 0 exception Thadeu Lima de Souza Cascardo
2021-08-30 18:32 ` [PATCH 4.14 3/4] bpf: Fix 32 bit src register truncation on div/mod Thadeu Lima de Souza Cascardo
2021-08-30 18:32 ` [PATCH 4.14 4/4] bpf: Fix truncation handling for mod32 dst reg wrt zero Thadeu Lima de Souza Cascardo
2021-09-01 9:43 ` Greg KH [this message]
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