From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 21 Jan 2008 00:20:19 +0000 (+0200)
Subject: vfs: coredumping fix (CVE-2007-6206)
X-Git-Tag: v2.6.16.60-rc1~3
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0b8a0a777d2d114f84716117ffb36a3d3644b7fe;p=thirdparty%2Fkernel%2Fstable.git

vfs: coredumping fix (CVE-2007-6206)

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>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
---

diff --git a/fs/exec.c b/fs/exec.c
index 91a36b27ec914..f28672f6a1722 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1512,6 +1512,12 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
 
 	if (!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)