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The uma_zone data structure defines the size of its uz_cpu[] array as 1,

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but then sizes the containing data structure at run-time to make room
for per-cpu cache data.  Modify libmemstat to separately allocate a
buffer to hold per-cpu cache data, sized based on the run-time mp_maxid
variable when using libkvm to access UMA data.  This avoids reading
invalid cache data from beyond the end of the uma_zone data structure
on the stack, which can result in invalid statistics and/or reads from
invalid kernel addresses.

Foot target practice by:	ps
MFC after:			3 days
This commit is contained in:
Robert Watson 2006-02-11 19:19:29 +00:00
parent 59e012a852
commit 1d90b80f28
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=155550
1 changed files with 24 additions and 2 deletions
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26
lib/libmemstat/memstat_uma.c
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@ -40,6 +40,7 @@
#include <errno.h>
#include <kvm.h>
#include <nlist.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -306,7 +307,7 @@ memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle)
LIST_HEAD(, uma_keg) uma_kegs;
struct memory_type *mtp;
struct uma_bucket *ubp, ub;
struct uma_cache *ucp;
struct uma_cache *ucp, *ucp_array;
struct uma_zone *uzp, uz;
struct uma_keg *kzp, kz;
int hint_dontsearch, i, mp_maxid, ret;
@ -340,10 +341,16 @@ memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle)
list->mtl_error = ret;
return (-1);
}
ucp_array = malloc(sizeof(struct uma_cache) * (mp_maxid + 1));
if (ucp_array == NULL) {
list->mtl_error = MEMSTAT_ERROR_NOMEMORY;
return (-1);
}
for (kzp = LIST_FIRST(&uma_kegs); kzp != NULL; kzp =
LIST_NEXT(&kz, uk_link)) {
ret = kread(kvm, kzp, &kz, sizeof(kz), 0);
if (ret != 0) {
free(ucp_array);
_memstat_mtl_empty(list);
list->mtl_error = ret;
return (-1);
@ -352,6 +359,16 @@ memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle)
LIST_NEXT(&uz, uz_link)) {
ret = kread(kvm, uzp, &uz, sizeof(uz), 0);
if (ret != 0) {
free(ucp_array);
_memstat_mtl_empty(list);
list->mtl_error = ret;
return (-1);
}
ret = kread(kvm, uzp, ucp_array,
sizeof(struct uma_cache) * (mp_maxid + 1),
offsetof(struct uma_zone, uz_cpu[0]));
if (ret != 0) {
free(ucp_array);
_memstat_mtl_empty(list);
list->mtl_error = ret;
return (-1);
@ -359,6 +376,7 @@ memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle)
ret = kread_string(kvm, uz.uz_name, name,
MEMTYPE_MAXNAME);
if (ret != 0) {
free(ucp_array);
_memstat_mtl_empty(list);
list->mtl_error = ret;
return (-1);
@ -372,6 +390,7 @@ memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle)
mtp = _memstat_mt_allocate(list, ALLOCATOR_UMA,
name);
if (mtp == NULL) {
free(ucp_array);
_memstat_mtl_empty(list);
list->mtl_error = MEMSTAT_ERROR_NOMEMORY;
return (-1);
@ -388,7 +407,7 @@ memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle)
for (i = 0; i < mp_maxid + 1; i++) {
if ((all_cpus & (1 << i)) == 0)
continue;
ucp = &uz.uz_cpu[i];
ucp = &ucp_array[i];
mtp->mt_numallocs += ucp->uc_allocs;
mtp->mt_numfrees += ucp->uc_frees;
@ -396,6 +415,7 @@ memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle)
ret = kread(kvm, ucp->uc_allocbucket,
&ub, sizeof(ub), 0);
if (ret != 0) {
free(ucp_array);
_memstat_mtl_empty(list);
list->mtl_error = ret;
return (-1);
@ -406,6 +426,7 @@ memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle)
ret = kread(kvm, ucp->uc_freebucket,
&ub, sizeof(ub), 0);
if (ret != 0) {
free(ucp_array);
_memstat_mtl_empty(list);
list->mtl_error = ret;
return (-1);
@ -439,5 +460,6 @@ memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle)
mtp->mt_free += mtp->mt_zonefree;
}
}
free(ucp_array);
return (0);
}