linux-kernel - [PATCHv2 0/2] IPC DoS fix

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Message-Id: <1383478588-7011-1-git-send-email-minipli@googlemail.com>
Date:	Sun,  3 Nov 2013 12:36:26 +0100
From:	Mathias Krause <minipli@...glemail.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Davidlohr Bueso <davidlohr@...com>,
	Pax Team <pageexec@...email.hu>,
	Brad Spengler <spender@...ecurity.net>,
	linux-kernel@...r.kernel.org,
	Mathias Krause <minipli@...glemail.com>
Subject: [PATCHv2 0/2] IPC DoS fix

Hi Linus,

version 2 of this series uses your approach to fix the issues by changing
load_msg() and friends to use a size_t for the message length. It differs
slightly from your patch to cover a few more places where the message
length is evaluated in sign extension problematic expressions. Also the
sysctl change is still a separate patch to allow reverting it in case it
breaks existing userland. It now handles all three sysctls: msgmax, msgmnb
and msgmni. All still capped at INT_MAX, though. They're privileged
sysctls after all. And setting them to INT_MAX does not end up in a system
crash, as it is now for negative values, but in an OOM killer invocation
instead which can be handled gracefully.

Regards,
Mathias

Mathias Krause (2):
  ipc, msg: fix message length check for negative values
  ipc, msg: forbid negative values for "msg{max,mnb,mni}"

 include/linux/ipc_namespace.h |    6 +++---
 include/linux/msg.h           |    6 +++---
 ipc/ipc_sysctl.c              |   20 ++++++++++++--------
 ipc/msgutil.c                 |   20 ++++++++++----------
 ipc/util.h                    |    4 ++--
 5 files changed, 30 insertions(+), 26 deletions(-)

-- 
1.7.10.4

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