Fwd: fs/exec.c core dumping on NFS mounted directory

From: Lei Sun
Date: Fri Jun 25 2010 - 15:32:48 EST

  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).

Proposed patch:

--- exec.c 2010-05-19 17:33:16.000000000 -0700
+++ exec.c.new 2010-05-19 17:33:07.000000000 -0700
@@ -1859,7 +1859,7 @@
* Dont allow local users get cute and trick others to coredump
* into their pre-created files:
- if (inode->i_uid != current_fsuid())
+ if (inode->i_bytes != 0 && inode->i_uid != current_fsuid())
goto close_fail;

if (!file->f_op)

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

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