From c8923c6b852d3a97c1faad0566e38fca330375a7 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Thu, 13 Oct 2005 14:41:23 -0700
Subject: [PATCH] [NETFILTER]: Fix OOPSes on machines with discontiguous cpu
numbering.
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Original patch by Harald Welte, with feedback from Herbert Xu
and testing by Sébastien Bernard.
EBTABLES, ARP tables, and IP/IP6 tables all assume that cpus
are numbered linearly. That is not necessarily true.
This patch fixes that up by calculating the largest possible
cpu number, and allocating enough per-cpu structure space given
that.
Signed-off-by: David S. Miller <davem@davemloft.net>
---
arch/cris/arch-v32/kernel/smp.c | 2 ++
arch/sh/kernel/smp.c | 3 +++
include/linux/cpumask.h | 12 ++++++++++++
net/bridge/netfilter/ebtables.c | 27 +++++++++++++++++----------
net/ipv4/netfilter/arp_tables.c | 14 +++++++++-----
net/ipv4/netfilter/ip_tables.c | 17 +++++++++++------
net/ipv6/netfilter/ip6_tables.c | 16 +++++++++++-----
7 files changed, 65 insertions(+), 26 deletions(-)
diff --git a/arch/cris/arch-v32/kernel/smp.c b/arch/cris/arch-v32/kernel/smp.c
index 2c5cae04a95c..957f551ba5ce 100644
--- a/arch/cris/arch-v32/kernel/smp.c
+++ b/arch/cris/arch-v32/kernel/smp.c
@@ -15,6 +15,7 @@
#include <linux/kernel.h>
#include <linux/cpumask.h>
#include <linux/interrupt.h>
+#include <linux/module.h>
#define IPI_SCHEDULE 1
#define IPI_CALL 2
@@ -28,6 +29,7 @@ spinlock_t cris_atomic_locks[] = { [0 ... LOCK_COUNT - 1] = SPIN_LOCK_UNLOCKED};
/* CPU masks */
cpumask_t cpu_online_map = CPU_MASK_NONE;
cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
+EXPORT_SYMBOL(phys_cpu_present_map);
/* Variables used during SMP boot */
volatile int cpu_now_booting = 0;
diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c
index 56a39d69e080..5ecefc02896a 100644
--- a/arch/sh/kernel/smp.c
+++ b/arch/sh/kernel/smp.c
@@ -22,6 +22,7 @@
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/sched.h>
+#include <linux/module.h>
#include <asm/atomic.h>
#include <asm/processor.h>
@@ -39,6 +40,8 @@ struct sh_cpuinfo cpu_data[NR_CPUS];
extern void per_cpu_trap_init(void);
cpumask_t cpu_possible_map;
+EXPORT_SYMBOL(cpu_possible_map);
+
cpumask_t cpu_online_map;
static atomic_t cpus_booted = ATOMIC_INIT(0);
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index b15826f6e3a2..fe9778301d07 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -392,4 +392,16 @@ extern cpumask_t cpu_present_map;
#define for_each_online_cpu(cpu) for_each_cpu_mask((cpu), cpu_online_map)
#define for_each_present_cpu(cpu) for_each_cpu_mask((cpu), cpu_present_map)
+/* Find the highest possible smp_processor_id() */
+static inline unsigned int highest_possible_processor_id(void)
+{
+ unsigned int cpu, highest = 0;
+
+ for_each_cpu_mask(cpu, cpu_possible_map)
+ highest = cpu;
+
+ return highest;
+}
+
+
#endif /* __LINUX_CPUMASK_H */
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index c4540144f0f4..f8ffbf6e2333 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -26,6 +26,7 @@
#include <linux/spinlock.h>
#include <asm/uaccess.h>
#include <linux/smp.h>
+#include <linux/cpumask.h>
#include <net/sock.h>
/* needed for logical [in,out]-dev filtering */
#include "../br_private.h"
@@ -823,10 +824,11 @@ static int translate_table(struct ebt_replace *repl,
/* this will get free'd in do_replace()/ebt_register_table()
if an error occurs */
newinfo->chainstack = (struct ebt_chainstack **)
- vmalloc(num_possible_cpus() * sizeof(struct ebt_chainstack));
+ vmalloc((highest_possible_processor_id()+1)
+ * sizeof(struct ebt_chainstack));
if (!newinfo->chainstack)
return -ENOMEM;
- for (i = 0; i < num_possible_cpus(); i++) {
+ for_each_cpu(i) {
newinfo->chainstack[i] =
vmalloc(udc_cnt * sizeof(struct ebt_chainstack));
if (!newinfo->chainstack[i]) {
@@ -895,9 +897,12 @@ static void get_counters(struct ebt_counter *oldcounters,
/* counters of cpu 0 */
memcpy(counters, oldcounters,
- sizeof(struct ebt_counter) * nentries);
+ sizeof(struct ebt_counter) * nentries);
+
/* add other counters to those of cpu 0 */
- for (cpu = 1; cpu < num_possible_cpus(); cpu++) {
+ for_each_cpu(cpu) {
+ if (cpu == 0)
+ continue;
counter_base = COUNTER_BASE(oldcounters, nentries, cpu);
for (i = 0; i < nentries; i++) {
counters[i].pcnt += counter_base[i].pcnt;
@@ -929,7 +934,8 @@ static int do_replace(void __user *user, unsigned int len)
BUGPRINT("Entries_size never zero\n");
return -EINVAL;
}
- countersize = COUNTER_OFFSET(tmp.nentries) * num_possible_cpus();
+ countersize = COUNTER_OFFSET(tmp.nentries) *
+ (highest_possible_processor_id()+1);
newinfo = (struct ebt_table_info *)
vmalloc(sizeof(struct ebt_table_info) + countersize);
if (!newinfo)
@@ -1022,7 +1028,7 @@ static int do_replace(void __user *user, unsigned int len)
vfree(table->entries);
if (table->chainstack) {
- for (i = 0; i < num_possible_cpus(); i++)
+ for_each_cpu(i)
vfree(table->chainstack[i]);
vfree(table->chainstack);
}
@@ -1040,7 +1046,7 @@ free_counterstmp:
vfree(counterstmp);
/* can be initialized in translate_table() */
if (newinfo->chainstack) {
- for (i = 0; i < num_possible_cpus(); i++)
+ for_each_cpu(i)
vfree(newinfo->chainstack[i]);
vfree(newinfo->chainstack);
}
@@ -1132,7 +1138,8 @@ int ebt_register_table(struct ebt_table *table)
return -EINVAL;
}
- countersize = COUNTER_OFFSET(table->table->nentries) * num_possible_cpus();
+ countersize = COUNTER_OFFSET(table->table->nentries) *
+ (highest_possible_processor_id()+1);
newinfo = (struct ebt_table_info *)
vmalloc(sizeof(struct ebt_table_info) + countersize);
ret = -ENOMEM;
@@ -1186,7 +1193,7 @@ free_unlock:
up(&ebt_mutex);
free_chainstack:
if (newinfo->chainstack) {
- for (i = 0; i < num_possible_cpus(); i++)
+ for_each_cpu(i)
vfree(newinfo->chainstack[i]);
vfree(newinfo->chainstack);
}
@@ -1209,7 +1216,7 @@ void ebt_unregister_table(struct ebt_table *table)
up(&ebt_mutex);
vfree(table->private->entries);
if (table->private->chainstack) {
- for (i = 0; i < num_possible_cpus(); i++)
+ for_each_cpu(i)
vfree(table->private->chainstack[i]);
vfree(table->private->chainstack);
}
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index fa1634256680..a7969286e6e7 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -716,8 +716,10 @@ static int translate_table(const char *name,
}
/* And one copy for every other CPU */
- for (i = 1; i < num_possible_cpus(); i++) {
- memcpy(newinfo->entries + SMP_ALIGN(newinfo->size)*i,
+ for_each_cpu(i) {
+ if (i == 0)
+ continue;
+ memcpy(newinfo->entries + SMP_ALIGN(newinfo->size) * i,
newinfo->entries,
SMP_ALIGN(newinfo->size));
}
@@ -767,7 +769,7 @@ static void get_counters(const struct arpt_table_info *t,
unsigned int cpu;
unsigned int i;
- for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
+ for_each_cpu(cpu) {
i = 0;
ARPT_ENTRY_ITERATE(t->entries + TABLE_OFFSET(t, cpu),
t->size,
@@ -885,7 +887,8 @@ static int do_replace(void __user *user, unsigned int len)
return -ENOMEM;
newinfo = vmalloc(sizeof(struct arpt_table_info)
- + SMP_ALIGN(tmp.size) * num_possible_cpus());
+ + SMP_ALIGN(tmp.size) *
+ (highest_possible_processor_id()+1));
if (!newinfo)
return -ENOMEM;
@@ -1158,7 +1161,8 @@ int arpt_register_table(struct arpt_table *table,
= { 0, 0, 0, { 0 }, { 0 }, { } };
newinfo = vmalloc(sizeof(struct arpt_table_info)
- + SMP_ALIGN(repl->size) * num_possible_cpus());
+ + SMP_ALIGN(repl->size) *
+ (highest_possible_processor_id()+1));
if (!newinfo) {
ret = -ENOMEM;
return ret;
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index eef99a1b5de6..75c27e92f6ab 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -27,6 +27,7 @@
#include <asm/semaphore.h>
#include <linux/proc_fs.h>
#include <linux/err.h>
+#include <linux/cpumask.h>
#include <linux/netfilter_ipv4/ip_tables.h>
@@ -921,8 +922,10 @@ translate_table(const char *name,
}
/* And one copy for every other CPU */
- for (i = 1; i < num_possible_cpus(); i++) {
- memcpy(newinfo->entries + SMP_ALIGN(newinfo->size)*i,
+ for_each_cpu(i) {
+ if (i == 0)
+ continue;
+ memcpy(newinfo->entries + SMP_ALIGN(newinfo->size) * i,
newinfo->entries,
SMP_ALIGN(newinfo->size));
}
@@ -943,7 +946,7 @@ replace_table(struct ipt_table *table,
struct ipt_entry *table_base;
unsigned int i;
- for (i = 0; i < num_possible_cpus(); i++) {
+ for_each_cpu(i) {
table_base =
(void *)newinfo->entries
+ TABLE_OFFSET(newinfo, i);
@@ -990,7 +993,7 @@ get_counters(const struct ipt_table_info *t,
unsigned int cpu;
unsigned int i;
- for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
+ for_each_cpu(cpu) {
i = 0;
IPT_ENTRY_ITERATE(t->entries + TABLE_OFFSET(t, cpu),
t->size,
@@ -1128,7 +1131,8 @@ do_replace(void __user *user, unsigned int len)
return -ENOMEM;
newinfo = vmalloc(sizeof(struct ipt_table_info)
- + SMP_ALIGN(tmp.size) * num_possible_cpus());
+ + SMP_ALIGN(tmp.size) *
+ (highest_possible_processor_id()+1));
if (!newinfo)
return -ENOMEM;
@@ -1458,7 +1462,8 @@ int ipt_register_table(struct ipt_table *table, const struct ipt_replace *repl)
= { 0, 0, 0, { 0 }, { 0 }, { } };
newinfo = vmalloc(sizeof(struct ipt_table_info)
- + SMP_ALIGN(repl->size) * num_possible_cpus());
+ + SMP_ALIGN(repl->size) *
+ (highest_possible_processor_id()+1));
if (!newinfo)
return -ENOMEM;
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 2da514b16d95..b03e90649eb5 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -28,6 +28,7 @@
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <linux/proc_fs.h>
+#include <linux/cpumask.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
@@ -950,8 +951,10 @@ translate_table(const char *name,
}
/* And one copy for every other CPU */
- for (i = 1; i < num_possible_cpus(); i++) {
- memcpy(newinfo->entries + SMP_ALIGN(newinfo->size)*i,
+ for_each_cpu(i) {
+ if (i == 0)
+ continue;
+ memcpy(newinfo->entries + SMP_ALIGN(newinfo->size) * i,
newinfo->entries,
SMP_ALIGN(newinfo->size));
}
@@ -973,6 +976,7 @@ replace_table(struct ip6t_table *table,
unsigned int i;
for (i = 0; i < num_possible_cpus(); i++) {
+ for_each_cpu(i) {
table_base =
(void *)newinfo->entries
+ TABLE_OFFSET(newinfo, i);
@@ -1019,7 +1023,7 @@ get_counters(const struct ip6t_table_info *t,
unsigned int cpu;
unsigned int i;
- for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
+ for_each_cpu(cpu) {
i = 0;
IP6T_ENTRY_ITERATE(t->entries + TABLE_OFFSET(t, cpu),
t->size,
@@ -1153,7 +1157,8 @@ do_replace(void __user *user, unsigned int len)
return -ENOMEM;
newinfo = vmalloc(sizeof(struct ip6t_table_info)
- + SMP_ALIGN(tmp.size) * num_possible_cpus());
+ + SMP_ALIGN(tmp.size) *
+ (highest_possible_processor_id()+1));
if (!newinfo)
return -ENOMEM;
@@ -1467,7 +1472,8 @@ int ip6t_register_table(struct ip6t_table *table,
= { 0, 0, 0, { 0 }, { 0 }, { } };
newinfo = vmalloc(sizeof(struct ip6t_table_info)
- + SMP_ALIGN(repl->size) * num_possible_cpus());
+ + SMP_ALIGN(repl->size) *
+ (highest_possible_processor_id()+1));
if (!newinfo)
return -ENOMEM;
--
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