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

Greg KH
2008-02-07T00:14:48Z

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

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@elte.hu>
Acked-by: Alan Cox <alan@redhat.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Al Viro <viro@ftp.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: maximilian attems <max@stro.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
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)

--