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Message-Id: <1292341443-18360-1-git-send-email-opurdila@ixiacom.com>
Date: Tue, 14 Dec 2010 17:44:03 +0200
From: Octavian Purdila <opurdila@...acom.com>
To: netdev@...r.kernel.org
Cc: Octavian Purdila <opurdila@...acom.com>,
Leonard Crestez <lcrestez@...acom.com>
Subject: [PATCH net-2.6] net: fix nulls list corruptions in sk_prot_alloc
Special care is taken inside sk_port_alloc to avoid overwriting
skc_node/skc_nulls_node. We should also avoid overwriting
skc_bind_node/skc_portaddr_node.
The patch fixes the following crash:
BUG: unable to handle kernel paging request at fffffffffffffff0
IP: [<ffffffff812ec6dd>] udp4_lib_lookup2+0xad/0x370
[<ffffffff812ecc22>] __udp4_lib_lookup+0x282/0x360
[<ffffffff812ed63e>] __udp4_lib_rcv+0x31e/0x700
[<ffffffff812bba45>] ? ip_local_deliver_finish+0x65/0x190
[<ffffffff812bbbf8>] ? ip_local_deliver+0x88/0xa0
[<ffffffff812eda35>] udp_rcv+0x15/0x20
[<ffffffff812bba45>] ip_local_deliver_finish+0x65/0x190
[<ffffffff812bbbf8>] ip_local_deliver+0x88/0xa0
[<ffffffff812bb2cd>] ip_rcv_finish+0x32d/0x6f0
[<ffffffff8128c14c>] ? netif_receive_skb+0x99c/0x11c0
[<ffffffff812bb94b>] ip_rcv+0x2bb/0x350
[<ffffffff8128c14c>] netif_receive_skb+0x99c/0x11c0
Signed-off-by: Leonard Crestez <lcrestez@...acom.com>
Signed-off-by: Octavian Purdila <opurdila@...acom.com>
---
include/net/sock.h | 4 ++++
net/core/sock.c | 49 +++++++++++++++++++++++++++++++++++++------------
net/dccp/ipv4.c | 1 +
net/dccp/ipv6.c | 1 +
net/ipv4/tcp_ipv4.c | 1 +
net/ipv4/udp.c | 1 +
net/ipv4/udplite.c | 1 +
net/ipv6/tcp_ipv6.c | 1 +
net/ipv6/udp.c | 1 +
net/ipv6/udplite.c | 1 +
net/llc/af_llc.c | 1 +
11 files changed, 50 insertions(+), 12 deletions(-)
diff --git a/include/net/sock.h b/include/net/sock.h
index 659d968..23747a8 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -754,6 +754,7 @@ struct proto {
void (*unhash)(struct sock *sk);
void (*rehash)(struct sock *sk);
int (*get_port)(struct sock *sk, unsigned short snum);
+ void (*clear_sk)(struct sock *sk, int size);
/* Keeping track of sockets in use */
#ifdef CONFIG_PROC_FS
@@ -852,6 +853,9 @@ static inline void __sk_prot_rehash(struct sock *sk)
sk->sk_prot->hash(sk);
}
+void sk_prot_clear_nulls(struct sock *sk, int size);
+void sk_prot_clear_portaddr_nulls(struct sock *sk, int size);
+
/* About 10 seconds */
#define SOCK_DESTROY_TIME (10*HZ)
diff --git a/net/core/sock.c b/net/core/sock.c
index fb60801..35e40e0 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1009,6 +1009,36 @@ static void sock_copy(struct sock *nsk, const struct sock *osk)
#endif
}
+/*
+ * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
+ * un-modified. Special care is taken when initializing object to zero.
+ */
+void sk_prot_clear_nulls(struct sock *sk, int size)
+{
+ if (offsetof(struct sock, sk_node.next) != 0)
+ memset(sk, 0, offsetof(struct sock, sk_node.next));
+ memset(&sk->sk_node.pprev, 0,
+ size - offsetof(struct sock, sk_node.pprev));
+}
+
+void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
+{
+ unsigned long nulls1, nulls2;
+
+ nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
+ nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
+ if (nulls1 > nulls2)
+ swap(nulls1, nulls2);
+
+ if (nulls1 != 0)
+ memset((char *)sk, 0, nulls1);
+ memset((char *)sk + nulls1 + sizeof(void *), 0,
+ nulls2 - nulls1 - sizeof(void *));
+ memset((char *)sk + nulls2 + sizeof(void *), 0,
+ size - nulls2 - sizeof(void *));
+}
+
+
static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
int family)
{
@@ -1021,19 +1051,12 @@ static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
if (!sk)
return sk;
if (priority & __GFP_ZERO) {
- /*
- * caches using SLAB_DESTROY_BY_RCU should let
- * sk_node.next un-modified. Special care is taken
- * when initializing object to zero.
- */
- if (offsetof(struct sock, sk_node.next) != 0)
- memset(sk, 0, offsetof(struct sock, sk_node.next));
- memset(&sk->sk_node.pprev, 0,
- prot->obj_size - offsetof(struct sock,
- sk_node.pprev));
+ if (prot->clear_sk)
+ prot->clear_sk(sk, prot->obj_size);
+ else
+ memset(sk, 0, prot->obj_size);
}
- }
- else
+ } else
sk = kmalloc(prot->obj_size, priority);
if (sk != NULL) {
@@ -2331,6 +2354,8 @@ static inline void release_proto_idx(struct proto *prot)
int proto_register(struct proto *prot, int alloc_slab)
{
+ BUG_ON((prot->slab_flags & SLAB_DESTROY_BY_RCU) && !prot->clear_sk);
+
if (alloc_slab) {
prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
SLAB_HWCACHE_ALIGN | prot->slab_flags,
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 3f69ea1..6ad0efb 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -956,6 +956,7 @@ static struct proto dccp_v4_prot = {
.compat_setsockopt = compat_dccp_setsockopt,
.compat_getsockopt = compat_dccp_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_nulls,
};
static const struct net_protocol dccp_v4_protocol = {
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index dca711d..738b893 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -1134,6 +1134,7 @@ static struct proto dccp_v6_prot = {
.compat_setsockopt = compat_dccp_setsockopt,
.compat_getsockopt = compat_dccp_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_nulls,
};
static const struct inet6_protocol dccp_v6_protocol = {
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index e13da6d..69964c5 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2627,6 +2627,7 @@ struct proto tcp_prot = {
.compat_setsockopt = compat_tcp_setsockopt,
.compat_getsockopt = compat_tcp_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_nulls,
};
EXPORT_SYMBOL(tcp_prot);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 5e0a3a5..2d3ded4 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1899,6 +1899,7 @@ struct proto udp_prot = {
.compat_setsockopt = compat_udp_setsockopt,
.compat_getsockopt = compat_udp_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_portaddr_nulls,
};
EXPORT_SYMBOL(udp_prot);
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c
index ab76aa9..aee9963 100644
--- a/net/ipv4/udplite.c
+++ b/net/ipv4/udplite.c
@@ -57,6 +57,7 @@ struct proto udplite_prot = {
.compat_setsockopt = compat_udp_setsockopt,
.compat_getsockopt = compat_udp_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_portaddr_nulls,
};
EXPORT_SYMBOL(udplite_prot);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 7e41e2c..ea42a2d 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2171,6 +2171,7 @@ struct proto tcpv6_prot = {
.compat_setsockopt = compat_tcp_setsockopt,
.compat_getsockopt = compat_tcp_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_nulls,
};
static const struct inet6_protocol tcpv6_protocol = {
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 91def93..cd6cb7c 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1477,6 +1477,7 @@ struct proto udpv6_prot = {
.compat_setsockopt = compat_udpv6_setsockopt,
.compat_getsockopt = compat_udpv6_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_portaddr_nulls,
};
static struct inet_protosw udpv6_protosw = {
diff --git a/net/ipv6/udplite.c b/net/ipv6/udplite.c
index 5f48fad..986c4de 100644
--- a/net/ipv6/udplite.c
+++ b/net/ipv6/udplite.c
@@ -55,6 +55,7 @@ struct proto udplitev6_prot = {
.compat_setsockopt = compat_udpv6_setsockopt,
.compat_getsockopt = compat_udpv6_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_portaddr_nulls,
};
static struct inet_protosw udplite6_protosw = {
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index e35dbe5..1d54c6a 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -142,6 +142,7 @@ static struct proto llc_proto = {
.owner = THIS_MODULE,
.obj_size = sizeof(struct llc_sock),
.slab_flags = SLAB_DESTROY_BY_RCU,
+ .clear_sk = sk_prot_clear_nulls,
};
/**
--
1.7.1
--
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