[patch 42/73] vfs: coredumping fix (CVE-2007-6206)

[Greg KH]

2.6.23-stable review patch.  If anyone has any objections, please let us know.
------------------
From: Ingo Molnar <mingo@xxxxxxx>

vfs: coredumping fix

patch c46f739dd39db3b07ab5deb4e3ec81e1c04a91af in mainline

fix: http://bugzilla.kernel.org/show_bug.cgi?id=3043

only allow coredumping to the same uid that the coredumping
task runs under.

Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Acked-by: Alan Cox <alan@xxxxxxxxxx>
Acked-by: Christoph Hellwig <hch@xxxxxx>
Acked-by: Al Viro <viro@xxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: maximilian attems <max@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 fs/exec.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1786,6 +1786,12 @@ int do_coredump(long signr, int exit_cod
 	   but keep the previous behaviour for now. */
 	if (!ispipe && !S_ISREG(inode->i_mode))
 		goto close_fail;
+	/*
+	 * Dont allow local users get cute and trick others to coredump
+	 * into their pre-created files:
+	 */
+	if (inode->i_uid != current->fsuid)
+		goto close_fail;
 	if (!file->f_op)
 		goto close_fail;
 	if (!file->f_op->write)

-- 
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