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  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:   Sun, 23 Oct 2016 17:44:05 -0400 (EDT)
From:   David Miller <>
Subject: Re: [PATCH] net: sctp, forbid negative length

From: Jiri Slaby <>
Date: Fri, 21 Oct 2016 14:13:24 +0200

> Most of getsockopt handlers in net/sctp/socket.c check len against
> sizeof some structure like:
>         if (len < sizeof(int))
>                 return -EINVAL;
> On the first look, the check seems to be correct. But since len is int
> and sizeof returns size_t, int gets promoted to unsigned size_t too. So
> the test returns false for negative lengths. Yes, (-1 < sizeof(long)) is
> false.
> Fix this in sctp by explicitly checking len < 0 before any getsockopt
> handler is called.
> Note that sctp_getsockopt_events already handled the negative case.
> Since we added the < 0 check elsewhere, this one can be removed.
> If not checked, this is the result:
> Signed-off-by: Jiri Slaby <>

Applied and queued up for -stable, thanks.

Powered by blists - more mailing lists