[NETFILTER]: Fix OOPSes on machines with discontiguous cpu numbering.

Original patch by Harald Welte, with feedback from Herbert Xu
and testing by Sbastien 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>
This commit is contained in:
David S. Miller 2005-10-13 14:41:23 -07:00
parent c931488cc4
commit c8923c6b85
7 changed files with 65 additions and 26 deletions

View File

@ -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;

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@ -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);

View File

@ -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 */

View File

@ -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]) {
@ -896,8 +898,11 @@ static void get_counters(struct ebt_counter *oldcounters,
/* counters of cpu 0 */
memcpy(counters, oldcounters,
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);
}

View File

@ -716,7 +716,9 @@ static int translate_table(const char *name,
}
/* And one copy for every other CPU */
for (i = 1; i < num_possible_cpus(); 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;

View File

@ -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>
@ -921,7 +922,9 @@ translate_table(const char *name,
}
/* And one copy for every other CPU */
for (i = 1; i < num_possible_cpus(); 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;

View File

@ -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>
@ -950,7 +951,9 @@ translate_table(const char *name,
}
/* And one copy for every other CPU */
for (i = 1; i < num_possible_cpus(); 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;