redonkable
/
remarkable-linux
1
0
Fork 0
Code Releases Activity

inet: frags: fix ip6frag_low_thresh boundary 

Giving an integer to proc_doulongvec_minmax() is dangerous on 64bit arches,
since linker might place next to it a non zero value preventing a change
to ip6frag_low_thresh.

ip6frag_low_thresh is not used anymore in the kernel, but we do not
want to prematuraly break user scripts wanting to change it.

Since specifying a minimal value of 0 for proc_doulongvec_minmax()
is moot, let's remove these zero values in all defrag units.

Fixes: 6e00f7dd5e ("ipv6: frags: fix /proc/sys/net/ipv6/ip6frag_low_thresh")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 3d23401283)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Eric Dumazet 2018-09-13 07:58:51 -07:00 committed by Greg Kroah-Hartman
parent 48c2afc168
commit 5fff99e88a
4 changed files with 3 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/ieee802154/6lowpan/reassembly.c
View File

@ -411,7 +411,6 @@ err:
}
#ifdef CONFIG_SYSCTL
static long zero;
static struct ctl_table lowpan_frags_ns_ctl_table[] = {
{
@ -428,7 +427,6 @@ static struct ctl_table lowpan_frags_ns_ctl_table[] = {
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = proc_doulongvec_minmax,
.extra1 = &zero,
.extra2 = &init_net.ieee802154_lowpan.frags.high_thresh
},
{

5
net/ipv4/ip_fragment.c
View File

@ -672,7 +672,7 @@ struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user)
EXPORT_SYMBOL(ip_check_defrag);
#ifdef CONFIG_SYSCTL
static long zero;
static int dist_min;
static struct ctl_table ip4_frags_ns_ctl_table[] = {
{
@ -689,7 +689,6 @@ static struct ctl_table ip4_frags_ns_ctl_table[] = {
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = proc_doulongvec_minmax,
.extra1 = &zero,
.extra2 = &init_net.ipv4.frags.high_thresh
},
{
@ -705,7 +704,7 @@ static struct ctl_table ip4_frags_ns_ctl_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &zero
.extra1 = &dist_min,
},
{ }
};

2
net/ipv6/netfilter/nf_conntrack_reasm.c
View File

@ -63,7 +63,6 @@ struct nf_ct_frag6_skb_cb
static struct inet_frags nf_frags;
#ifdef CONFIG_SYSCTL
static long zero;
static struct ctl_table nf_ct_frag6_sysctl_table[] = {
{
@ -79,7 +78,6 @@ static struct ctl_table nf_ct_frag6_sysctl_table[] = {
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = proc_doulongvec_minmax,
.extra1 = &zero,
.extra2 = &init_net.nf_frag.frags.high_thresh
},
{

4
net/ipv6/reassembly.c
View File

@ -554,7 +554,6 @@ static const struct inet6_protocol frag_protocol = {
};
#ifdef CONFIG_SYSCTL
static int zero;
static struct ctl_table ip6_frags_ns_ctl_table[] = {
{
@ -570,8 +569,7 @@ static struct ctl_table ip6_frags_ns_ctl_table[] = {
.data = &init_net.ipv6.frags.low_thresh,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &zero,
.proc_handler = proc_doulongvec_minmax,
.extra2 = &init_net.ipv6.frags.high_thresh
},
{