[PATCHv2 0/2] IPC DoS fix

From: Mathias Krause
Date: Sun Nov 03 2013 - 06:37:21 EST

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.


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(-)


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