linux-kernel - [PATCH 4.18 134/171] selinux: check length properly in SCTP bind hook

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Date:   Mon, 19 Nov 2018 17:28:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Qian Cai <cai@....us>,
        Richard Haines <richard_c_haines@...nternet.com>,
        Ondrej Mosnacek <omosnace@...hat.com>,
        Paul Moore <paul@...l-moore.com>
Subject: [PATCH 4.18 134/171] selinux: check length properly in SCTP bind hook

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ondrej Mosnacek <omosnace@...hat.com>

commit c138325fb8713472d5a0c3c7258b9131bab40725 upstream.

selinux_sctp_bind_connect() must verify if the address buffer has
sufficient length before accessing the 'sa_family' field. See
__sctp_connect() for a similar check.

The length of the whole address ('len') is already checked in the
callees.

Reported-by: Qian Cai <cai@....us>
Fixes: d452930fd3b9 ("selinux: Add SCTP support")
Cc: <stable@...r.kernel.org> # 4.17+
Cc: Richard Haines <richard_c_haines@...nternet.com>
Signed-off-by: Ondrej Mosnacek <omosnace@...hat.com>
Tested-by: Qian Cai <cai@....us>
Signed-off-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 security/selinux/hooks.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -5306,6 +5306,9 @@ static int selinux_sctp_bind_connect(str
 	addr_buf = address;
 
 	while (walk_size < addrlen) {
+		if (walk_size + sizeof(sa_family_t) > addrlen)
+			return -EINVAL;
+
 		addr = addr_buf;
 		switch (addr->sa_family) {
 		case AF_UNSPEC: