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Message-Id: <20200128135847.803026157@linuxfoundation.org>
Date: Tue, 28 Jan 2020 15:06:40 +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,
syzbot+fabca5cbf5e54f3fe2de@...kaller.appspotmail.com,
syzbot+827ced406c9a1d9570ed@...kaller.appspotmail.com,
syzbot+190d63957b22ef673ea5@...kaller.appspotmail.com,
syzbot+dfccdb2bdb4a12ad425e@...kaller.appspotmail.com,
syzbot+df0d0f5895ef1f41a65b@...kaller.appspotmail.com,
syzbot+b08bd19bb37513357fd4@...kaller.appspotmail.com,
syzbot+53cdd0ec0bbabd53370a@...kaller.appspotmail.com,
Jozsef Kadlecsik <kadlec@...filter.org>,
Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 4.4 181/183] netfilter: ipset: use bitmap infrastructure completely
From: Kadlecsik József <kadlec@...ckhole.kfki.hu>
commit 32c72165dbd0e246e69d16a3ad348a4851afd415 upstream.
The bitmap allocation did not use full unsigned long sizes
when calculating the required size and that was triggered by KASAN
as slab-out-of-bounds read in several places. The patch fixes all
of them.
Reported-by: syzbot+fabca5cbf5e54f3fe2de@...kaller.appspotmail.com
Reported-by: syzbot+827ced406c9a1d9570ed@...kaller.appspotmail.com
Reported-by: syzbot+190d63957b22ef673ea5@...kaller.appspotmail.com
Reported-by: syzbot+dfccdb2bdb4a12ad425e@...kaller.appspotmail.com
Reported-by: syzbot+df0d0f5895ef1f41a65b@...kaller.appspotmail.com
Reported-by: syzbot+b08bd19bb37513357fd4@...kaller.appspotmail.com
Reported-by: syzbot+53cdd0ec0bbabd53370a@...kaller.appspotmail.com
Signed-off-by: Jozsef Kadlecsik <kadlec@...filter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
include/linux/netfilter/ipset/ip_set.h | 7 -------
net/netfilter/ipset/ip_set_bitmap_gen.h | 2 +-
net/netfilter/ipset/ip_set_bitmap_ip.c | 6 +++---
net/netfilter/ipset/ip_set_bitmap_ipmac.c | 6 +++---
net/netfilter/ipset/ip_set_bitmap_port.c | 6 +++---
5 files changed, 10 insertions(+), 17 deletions(-)
--- a/include/linux/netfilter/ipset/ip_set.h
+++ b/include/linux/netfilter/ipset/ip_set.h
@@ -530,13 +530,6 @@ ip6addrptr(const struct sk_buff *skb, bo
sizeof(*addr));
}
-/* Calculate the bytes required to store the inclusive range of a-b */
-static inline int
-bitmap_bytes(u32 a, u32 b)
-{
- return 4 * ((((b - a + 8) / 8) + 3) / 4);
-}
-
#include <linux/netfilter/ipset/ip_set_timeout.h>
#include <linux/netfilter/ipset/ip_set_comment.h>
--- a/net/netfilter/ipset/ip_set_bitmap_gen.h
+++ b/net/netfilter/ipset/ip_set_bitmap_gen.h
@@ -81,7 +81,7 @@ mtype_flush(struct ip_set *set)
if (set->extensions & IPSET_EXT_DESTROY)
mtype_ext_cleanup(set);
- memset(map->members, 0, map->memsize);
+ bitmap_zero(map->members, map->elements);
}
static int
--- a/net/netfilter/ipset/ip_set_bitmap_ip.c
+++ b/net/netfilter/ipset/ip_set_bitmap_ip.c
@@ -40,7 +40,7 @@ MODULE_ALIAS("ip_set_bitmap:ip");
/* Type structure */
struct bitmap_ip {
- void *members; /* the set members */
+ unsigned long *members; /* the set members */
u32 first_ip; /* host byte order, included in range */
u32 last_ip; /* host byte order, included in range */
u32 elements; /* number of max elements in the set */
@@ -222,7 +222,7 @@ init_map_ip(struct ip_set *set, struct b
u32 first_ip, u32 last_ip,
u32 elements, u32 hosts, u8 netmask)
{
- map->members = ip_set_alloc(map->memsize);
+ map->members = bitmap_zalloc(elements, GFP_KERNEL | __GFP_NOWARN);
if (!map->members)
return false;
map->first_ip = first_ip;
@@ -315,7 +315,7 @@ bitmap_ip_create(struct net *net, struct
if (!map)
return -ENOMEM;
- map->memsize = bitmap_bytes(0, elements - 1);
+ map->memsize = BITS_TO_LONGS(elements) * sizeof(unsigned long);
set->variant = &bitmap_ip;
if (!init_map_ip(set, map, first_ip, last_ip,
elements, hosts, netmask)) {
--- a/net/netfilter/ipset/ip_set_bitmap_ipmac.c
+++ b/net/netfilter/ipset/ip_set_bitmap_ipmac.c
@@ -46,7 +46,7 @@ enum {
/* Type structure */
struct bitmap_ipmac {
- void *members; /* the set members */
+ unsigned long *members; /* the set members */
u32 first_ip; /* host byte order, included in range */
u32 last_ip; /* host byte order, included in range */
u32 elements; /* number of max elements in the set */
@@ -297,7 +297,7 @@ static bool
init_map_ipmac(struct ip_set *set, struct bitmap_ipmac *map,
u32 first_ip, u32 last_ip, u32 elements)
{
- map->members = ip_set_alloc(map->memsize);
+ map->members = bitmap_zalloc(elements, GFP_KERNEL | __GFP_NOWARN);
if (!map->members)
return false;
map->first_ip = first_ip;
@@ -361,7 +361,7 @@ bitmap_ipmac_create(struct net *net, str
if (!map)
return -ENOMEM;
- map->memsize = bitmap_bytes(0, elements - 1);
+ map->memsize = BITS_TO_LONGS(elements) * sizeof(unsigned long);
set->variant = &bitmap_ipmac;
if (!init_map_ipmac(set, map, first_ip, last_ip, elements)) {
kfree(map);
--- a/net/netfilter/ipset/ip_set_bitmap_port.c
+++ b/net/netfilter/ipset/ip_set_bitmap_port.c
@@ -34,7 +34,7 @@ MODULE_ALIAS("ip_set_bitmap:port");
/* Type structure */
struct bitmap_port {
- void *members; /* the set members */
+ unsigned long *members; /* the set members */
u16 first_port; /* host byte order, included in range */
u16 last_port; /* host byte order, included in range */
u32 elements; /* number of max elements in the set */
@@ -207,7 +207,7 @@ static bool
init_map_port(struct ip_set *set, struct bitmap_port *map,
u16 first_port, u16 last_port)
{
- map->members = ip_set_alloc(map->memsize);
+ map->members = bitmap_zalloc(map->elements, GFP_KERNEL | __GFP_NOWARN);
if (!map->members)
return false;
map->first_port = first_port;
@@ -250,7 +250,7 @@ bitmap_port_create(struct net *net, stru
return -ENOMEM;
map->elements = elements;
- map->memsize = bitmap_bytes(0, map->elements);
+ map->memsize = BITS_TO_LONGS(elements) * sizeof(unsigned long);
set->variant = &bitmap_port;
if (!init_map_port(set, map, first_port, last_port)) {
kfree(map);
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