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CVE-2015-7099 RDS: race condition on unbound socket null deref (rhbz 1276437 1276438)

This commit is contained in:
Josh Boyer 2015-10-29 13:45:31 -04:00
parent c7efbfc05a
commit e9a2e1b318
2 changed files with 84 additions and 0 deletions
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77
RDS-fix-race-condition-when-sending-a-message-on-unb.patch Normal file
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@ -0,0 +1,77 @@
From 09dca584f0b6b3bb4fc5f13a388274cd76b69f18 Mon Sep 17 00:00:00 2001
From: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Date: Fri, 16 Oct 2015 17:11:42 +0200
Subject: [PATCH] RDS: fix race condition when sending a message on unbound
socket.
Sasha's found a NULL pointer dereference in the RDS connection code when
sending a message to an apparently unbound socket. The problem is caused
by the code checking if the socket is bound in rds_sendmsg(), which checks
the rs_bound_addr field without taking a lock on the socket. This opens a
race where rs_bound_addr is temporarily set but where the transport is not
in rds_bind(), leading to a NULL pointer dereference when trying to
dereference 'trans' in __rds_conn_create().
Vegard wrote a reproducer for this issue, so kindly ask him to share if
you're interested.
I cannot reproduce the NULL pointer dereference using Vegard's reproducer
with this patch, whereas I could without.
Complete earlier incomplete fix to CVE-2015-6937:
74e98eb08588 ("RDS: verify the underlying transport exists before creating a connection")
Signed-off-by: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Reviewed-by: Vegard Nossum <vegard.nossum@oracle.com>
Reviewed-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Chien Yen <chien.yen@oracle.com>
Cc: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: stable@vger.kernel.org
---
net/rds/connection.c | 6 ------
net/rds/send.c | 4 +++-
2 files changed, 3 insertions(+), 7 deletions(-)
diff --git a/net/rds/connection.c b/net/rds/connection.c
index 9d66705f9d41..da6da57e5f36 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -187,12 +187,6 @@ new_conn:
}
}
- if (trans == NULL) {
- kmem_cache_free(rds_conn_slab, conn);
- conn = ERR_PTR(-ENODEV);
- goto out;
- }
-
conn->c_trans = trans;
ret = trans->conn_alloc(conn, gfp);
diff --git a/net/rds/send.c b/net/rds/send.c
index e9430f537f9c..7b30c0f3180d 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -986,11 +986,13 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
release_sock(sk);
}
- /* racing with another thread binding seems ok here */
+ lock_sock(sk);
if (daddr == 0 || rs->rs_bound_addr == 0) {
+ release_sock(sk);
ret = -ENOTCONN; /* XXX not a great errno */
goto out;
}
+ release_sock(sk);
/* size of rm including all sgs */
ret = rds_rm_size(msg, payload_len);
--
2.4.3

7
kernel.spec
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@ -619,6 +619,8 @@ Patch518: drm-vmwgfx-Allow-dropped-masters-render-node-like-ac.patch
#CVE-2015-6937 rhbz 1263139 1263140
Patch523: RDS-verify-the-underlying-transport-exists-before-cr.patch
#CVE-2015-7990 rhbz 1276437 1276438
Patch524: RDS-fix-race-condition-when-sending-a-message-on-unb.patch
#rhbz 1265978
Patch536: si2168-Bounds-check-firmware.patch
@ -1365,6 +1367,8 @@ ApplyPatch drm-vmwgfx-Allow-dropped-masters-render-node-like-ac.patch
#CVE-2015-6937 rhbz 1263139 1263140
ApplyPatch RDS-verify-the-underlying-transport-exists-before-cr.patch
#CVE-2015-7990 rhbz 1276437 1276438
ApplyPatch RDS-fix-race-condition-when-sending-a-message-on-unb.patch
ApplyPatch regulator-axp20x-module-alias.patch
@ -2226,6 +2230,9 @@ fi
#
#
%changelog
* Thu Oct 29 2015 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-2015-7099 RDS: race condition on unbound socket null deref (rhbz 1276437 1276438)
* Tue Oct 27 2015 Justin M. Forbes <jforbes@fedoraproject.org> - 4.2.5-201
- Bump for build