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Date: Mon, 14 Jun 2010 13:45:57 -0700
Message-ID: <AANLkTila2rrYcBUZKwywHTP6g8rsj7Z1ck6LSoC9GaUY@mail.gmail.com>
Subject: fs/exec.c core dumping on NFS mounted directory
From: Lei Sun <leisun124@gmail.com>
To: linux-kernel@vger.kernel.org
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Hi :
? In 2.6.3x, I am logging in as a root and running app from NFS
mounted directory. The app crashed with 0 bytes core file (I have set
"ulimit -c unlimited", so it's not an issue).
The following code in fs/exec.c is causing this:

? ?/*
? ? * Dont allow local users get cute and trick others to coredump
? ? * into their pre-created files:
? ? * Note, this is not relevant for pipes
? ? */
? ?if (!ispipe && (inode->i_uid != current_fsuid()))
? ? ? ?goto close_fail;

What is the intention of above piece of code? ?If it's security
concern, ?it clearly break the NFS mounted (different uid) core
dumping logic.

P.S. CC to my email, i am not on the list.

Thanks
lei
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