lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:   Tue, 5 Jan 2021 09:09:24 +0100
From:   Steffen Klassert <>
To:     Cong Wang <>
CC:     <>, Cong Wang <>,
        Herbert Xu <>
Subject: Re: [Patch net] af_key: relax availability checks for skb size

On Sat, Dec 26, 2020 at 04:50:20PM -0800, Cong Wang wrote:
> From: Cong Wang <>
> xfrm_probe_algs() probes kernel crypto modules and changes the
> availability of struct xfrm_algo_desc. But there is a small window
> where ealg->available and aalg->available get changed between
> count_ah_combs()/count_esp_combs() and dump_ah_combs()/dump_esp_combs(),
> in this case we may allocate a smaller skb but later put a larger
> amount of data and trigger the panic in skb_put().
> Fix this by relaxing the checks when counting the size, that is,
> skipping the test of ->available. We may waste some memory for a few
> of sizeof(struct sadb_comb), but it is still much better than a panic.
> Reported-by:
> Cc: Steffen Klassert <>
> Cc: Herbert Xu <>
> Signed-off-by: Cong Wang <>

Patch applied, thanks!

Powered by blists - more mailing lists