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[SCSI] target: fix use after free detected by SLUB poison

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This patch moves a large number of memory release paths inside of the
configfs callback target_core_hba_item_ops->release() called from
within fs/configfs/item.c: config_item_cleanup() context.  This patch
resolves the SLUB 'Poison overwritten' warnings.

Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Nicholas Bellinger 2011-02-09 15:34:54 -08:00 committed by James Bottomley
parent e89d15eead
commit 1f6fe7cba1
3 changed files with 140 additions and 73 deletions
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120
drivers/target/target_core_configfs.c
View File

@ -1970,13 +1970,35 @@ static void target_core_dev_release(struct config_item *item)
{
struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
struct se_subsystem_dev, se_dev_group);
struct config_group *dev_cg;
struct se_hba *hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
struct se_subsystem_api *t = hba->transport;
struct config_group *dev_cg = &se_dev->se_dev_group;
if (!(se_dev))
return;
dev_cg = &se_dev->se_dev_group;
kfree(dev_cg->default_groups);
/*
* This pointer will set when the storage is enabled with:
*`echo 1 > $CONFIGFS/core/$HBA/$DEV/dev_enable`
*/
if (se_dev->se_dev_ptr) {
printk(KERN_INFO "Target_Core_ConfigFS: Calling se_free_"
"virtual_device() for se_dev_ptr: %p\n",
se_dev->se_dev_ptr);
se_free_virtual_device(se_dev->se_dev_ptr, hba);
} else {
/*
* Release struct se_subsystem_dev->se_dev_su_ptr..
*/
printk(KERN_INFO "Target_Core_ConfigFS: Calling t->free_"
"device() for se_dev_su_ptr: %p\n",
se_dev->se_dev_su_ptr);
t->free_device(se_dev->se_dev_su_ptr);
}
printk(KERN_INFO "Target_Core_ConfigFS: Deallocating se_subsystem"
"_dev_t: %p\n", se_dev);
kfree(se_dev);
}
static ssize_t target_core_dev_show(struct config_item *item,
@ -2139,7 +2161,16 @@ static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
NULL,
};
static void target_core_alua_lu_gp_release(struct config_item *item)
{
struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
struct t10_alua_lu_gp, lu_gp_group);
core_alua_free_lu_gp(lu_gp);
}
static struct configfs_item_operations target_core_alua_lu_gp_ops = {
.release = target_core_alua_lu_gp_release,
.show_attribute = target_core_alua_lu_gp_attr_show,
.store_attribute = target_core_alua_lu_gp_attr_store,
};
@ -2190,9 +2221,11 @@ static void target_core_alua_drop_lu_gp(
printk(KERN_INFO "Target_Core_ConfigFS: Releasing ALUA Logical Unit"
" Group: core/alua/lu_gps/%s, ID: %hu\n",
config_item_name(item), lu_gp->lu_gp_id);
/*
* core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
* -> target_core_alua_lu_gp_release()
*/
config_item_put(item);
core_alua_free_lu_gp(lu_gp);
}
static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
@ -2548,7 +2581,16 @@ static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
NULL,
};
static void target_core_alua_tg_pt_gp_release(struct config_item *item)
{
struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
struct t10_alua_tg_pt_gp, tg_pt_gp_group);
core_alua_free_tg_pt_gp(tg_pt_gp);
}
static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
.release = target_core_alua_tg_pt_gp_release,
.show_attribute = target_core_alua_tg_pt_gp_attr_show,
.store_attribute = target_core_alua_tg_pt_gp_attr_store,
};
@ -2601,9 +2643,11 @@ static void target_core_alua_drop_tg_pt_gp(
printk(KERN_INFO "Target_Core_ConfigFS: Releasing ALUA Target Port"
" Group: alua/tg_pt_gps/%s, ID: %hu\n",
config_item_name(item), tg_pt_gp->tg_pt_gp_id);
/*
* core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
* -> target_core_alua_tg_pt_gp_release().
*/
config_item_put(item);
core_alua_free_tg_pt_gp(tg_pt_gp);
}
static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
@ -2770,13 +2814,11 @@ static void target_core_drop_subdev(
struct se_subsystem_api *t;
struct config_item *df_item;
struct config_group *dev_cg, *tg_pt_gp_cg;
int i, ret;
int i;
hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
if (mutex_lock_interruptible(&hba->hba_access_mutex))
goto out;
mutex_lock(&hba->hba_access_mutex);
t = hba->transport;
spin_lock(&se_global->g_device_lock);
@ -2790,7 +2832,10 @@ static void target_core_drop_subdev(
config_item_put(df_item);
}
kfree(tg_pt_gp_cg->default_groups);
core_alua_free_tg_pt_gp(T10_ALUA(se_dev)->default_tg_pt_gp);
/*
* core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
* directly from target_core_alua_tg_pt_gp_release().
*/
T10_ALUA(se_dev)->default_tg_pt_gp = NULL;
dev_cg = &se_dev->se_dev_group;
@ -2799,38 +2844,12 @@ static void target_core_drop_subdev(
dev_cg->default_groups[i] = NULL;
config_item_put(df_item);
}
config_item_put(item);
/*
* This pointer will set when the storage is enabled with:
* `echo 1 > $CONFIGFS/core/$HBA/$DEV/dev_enable`
* The releasing of se_dev and associated se_dev->se_dev_ptr is done
* from target_core_dev_item_ops->release() ->target_core_dev_release().
*/
if (se_dev->se_dev_ptr) {
printk(KERN_INFO "Target_Core_ConfigFS: Calling se_free_"
"virtual_device() for se_dev_ptr: %p\n",
se_dev->se_dev_ptr);
ret = se_free_virtual_device(se_dev->se_dev_ptr, hba);
if (ret < 0)
goto hba_out;
} else {
/*
* Release struct se_subsystem_dev->se_dev_su_ptr..
*/
printk(KERN_INFO "Target_Core_ConfigFS: Calling t->free_"
"device() for se_dev_su_ptr: %p\n",
se_dev->se_dev_su_ptr);
t->free_device(se_dev->se_dev_su_ptr);
}
printk(KERN_INFO "Target_Core_ConfigFS: Deallocating se_subsystem"
"_dev_t: %p\n", se_dev);
hba_out:
config_item_put(item);
mutex_unlock(&hba->hba_access_mutex);
out:
kfree(se_dev);
}
static struct configfs_group_operations target_core_hba_group_ops = {
@ -2913,6 +2932,13 @@ SE_HBA_ATTR(hba_mode, S_IRUGO | S_IWUSR);
CONFIGFS_EATTR_OPS(target_core_hba, se_hba, hba_group);
static void target_core_hba_release(struct config_item *item)
{
struct se_hba *hba = container_of(to_config_group(item),
struct se_hba, hba_group);
core_delete_hba(hba);
}
static struct configfs_attribute *target_core_hba_attrs[] = {
&target_core_hba_hba_info.attr,
&target_core_hba_hba_mode.attr,
@ -2920,6 +2946,7 @@ static struct configfs_attribute *target_core_hba_attrs[] = {
};
static struct configfs_item_operations target_core_hba_item_ops = {
.release = target_core_hba_release,
.show_attribute = target_core_hba_attr_show,
.store_attribute = target_core_hba_attr_store,
};
@ -2996,10 +3023,11 @@ static void target_core_call_delhbafromtarget(
struct config_group *group,
struct config_item *item)
{
struct se_hba *hba = item_to_hba(item);
/*
* core_delete_hba() is called from target_core_hba_item_ops->release()
* -> target_core_hba_release()
*/
config_item_put(item);
core_delete_hba(hba);
}
static struct configfs_group_operations target_core_group_ops = {

92
drivers/target/target_core_fabric_configfs.c
View File

@ -214,12 +214,22 @@ TCM_MAPPEDLUN_ATTR(write_protect, S_IRUGO | S_IWUSR);
CONFIGFS_EATTR_OPS(target_fabric_mappedlun, se_lun_acl, se_lun_group);
static void target_fabric_mappedlun_release(struct config_item *item)
{
struct se_lun_acl *lacl = container_of(to_config_group(item),
struct se_lun_acl, se_lun_group);
struct se_portal_group *se_tpg = lacl->se_lun_nacl->se_tpg;
core_dev_free_initiator_node_lun_acl(se_tpg, lacl);
}
static struct configfs_attribute *target_fabric_mappedlun_attrs[] = {
&target_fabric_mappedlun_write_protect.attr,
NULL,
};
static struct configfs_item_operations target_fabric_mappedlun_item_ops = {
.release = target_fabric_mappedlun_release,
.show_attribute = target_fabric_mappedlun_attr_show,
.store_attribute = target_fabric_mappedlun_attr_store,
.allow_link = target_fabric_mappedlun_link,
@ -337,15 +347,21 @@ static void target_fabric_drop_mappedlun(
struct config_group *group,
struct config_item *item)
{
struct se_lun_acl *lacl = container_of(to_config_group(item),
struct se_lun_acl, se_lun_group);
struct se_portal_group *se_tpg = lacl->se_lun_nacl->se_tpg;
config_item_put(item);
core_dev_free_initiator_node_lun_acl(se_tpg, lacl);
}
static void target_fabric_nacl_base_release(struct config_item *item)
{
struct se_node_acl *se_nacl = container_of(to_config_group(item),
struct se_node_acl, acl_group);
struct se_portal_group *se_tpg = se_nacl->se_tpg;
struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
tf->tf_ops.fabric_drop_nodeacl(se_nacl);
}
static struct configfs_item_operations target_fabric_nacl_base_item_ops = {
.release = target_fabric_nacl_base_release,
.show_attribute = target_fabric_nacl_base_attr_show,
.store_attribute = target_fabric_nacl_base_attr_store,
};
@ -404,9 +420,6 @@ static void target_fabric_drop_nodeacl(
struct config_group *group,
struct config_item *item)
{
struct se_portal_group *se_tpg = container_of(group,
struct se_portal_group, tpg_acl_group);
struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
struct se_node_acl *se_nacl = container_of(to_config_group(item),
struct se_node_acl, acl_group);
struct config_item *df_item;
@ -419,9 +432,10 @@ static void target_fabric_drop_nodeacl(
nacl_cg->default_groups[i] = NULL;
config_item_put(df_item);
}
/*
* struct se_node_acl free is done in target_fabric_nacl_base_release()
*/
config_item_put(item);
tf->tf_ops.fabric_drop_nodeacl(se_nacl);
}
static struct configfs_group_operations target_fabric_nacl_group_ops = {
@ -437,7 +451,18 @@ TF_CIT_SETUP(tpg_nacl, NULL, &target_fabric_nacl_group_ops, NULL);
CONFIGFS_EATTR_OPS(target_fabric_np_base, se_tpg_np, tpg_np_group);
static void target_fabric_np_base_release(struct config_item *item)
{
struct se_tpg_np *se_tpg_np = container_of(to_config_group(item),
struct se_tpg_np, tpg_np_group);
struct se_portal_group *se_tpg = se_tpg_np->tpg_np_parent;
struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
tf->tf_ops.fabric_drop_np(se_tpg_np);
}
static struct configfs_item_operations target_fabric_np_base_item_ops = {
.release = target_fabric_np_base_release,
.show_attribute = target_fabric_np_base_attr_show,
.store_attribute = target_fabric_np_base_attr_store,
};
@ -466,6 +491,7 @@ static struct config_group *target_fabric_make_np(
if (!(se_tpg_np) || IS_ERR(se_tpg_np))
return ERR_PTR(-EINVAL);
se_tpg_np->tpg_np_parent = se_tpg;
config_group_init_type_name(&se_tpg_np->tpg_np_group, name,
&TF_CIT_TMPL(tf)->tfc_tpg_np_base_cit);
@ -476,14 +502,10 @@ static void target_fabric_drop_np(
struct config_group *group,
struct config_item *item)
{
struct se_portal_group *se_tpg = container_of(group,
struct se_portal_group, tpg_np_group);
struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
struct se_tpg_np *se_tpg_np = container_of(to_config_group(item),
struct se_tpg_np, tpg_np_group);
/*
* struct se_tpg_np is released via target_fabric_np_base_release()
*/
config_item_put(item);
tf->tf_ops.fabric_drop_np(se_tpg_np);
}
static struct configfs_group_operations target_fabric_np_group_ops = {
@ -814,7 +836,18 @@ TF_CIT_SETUP(tpg_param, &target_fabric_tpg_param_item_ops, NULL, NULL);
*/
CONFIGFS_EATTR_OPS(target_fabric_tpg, se_portal_group, tpg_group);
static void target_fabric_tpg_release(struct config_item *item)
{
struct se_portal_group *se_tpg = container_of(to_config_group(item),
struct se_portal_group, tpg_group);
struct se_wwn *wwn = se_tpg->se_tpg_wwn;
struct target_fabric_configfs *tf = wwn->wwn_tf;
tf->tf_ops.fabric_drop_tpg(se_tpg);
}
static struct configfs_item_operations target_fabric_tpg_base_item_ops = {
.release = target_fabric_tpg_release,
.show_attribute = target_fabric_tpg_attr_show,
.store_attribute = target_fabric_tpg_attr_store,
};
@ -872,8 +905,6 @@ static void target_fabric_drop_tpg(
struct config_group *group,
struct config_item *item)
{
struct se_wwn *wwn = container_of(group, struct se_wwn, wwn_group);
struct target_fabric_configfs *tf = wwn->wwn_tf;
struct se_portal_group *se_tpg = container_of(to_config_group(item),
struct se_portal_group, tpg_group);
struct config_group *tpg_cg = &se_tpg->tpg_group;
@ -890,15 +921,28 @@ static void target_fabric_drop_tpg(
}
config_item_put(item);
tf->tf_ops.fabric_drop_tpg(se_tpg);
}
static void target_fabric_release_wwn(struct config_item *item)
{
struct se_wwn *wwn = container_of(to_config_group(item),
struct se_wwn, wwn_group);
struct target_fabric_configfs *tf = wwn->wwn_tf;
tf->tf_ops.fabric_drop_wwn(wwn);
}
static struct configfs_item_operations target_fabric_tpg_item_ops = {
.release = target_fabric_release_wwn,
};
static struct configfs_group_operations target_fabric_tpg_group_ops = {
.make_group = target_fabric_make_tpg,
.drop_item = target_fabric_drop_tpg,
};
TF_CIT_SETUP(tpg, NULL, &target_fabric_tpg_group_ops, NULL);
TF_CIT_SETUP(tpg, &target_fabric_tpg_item_ops, &target_fabric_tpg_group_ops,
NULL);
/* End of tfc_tpg_cit */
@ -932,13 +976,7 @@ static void target_fabric_drop_wwn(
struct config_group *group,
struct config_item *item)
{
struct target_fabric_configfs *tf = container_of(group,
struct target_fabric_configfs, tf_group);
struct se_wwn *wwn = container_of(to_config_group(item),
struct se_wwn, wwn_group);
config_item_put(item);
tf->tf_ops.fabric_drop_wwn(wwn);
}
static struct configfs_group_operations target_fabric_wwn_group_ops = {

1
include/target/target_core_base.h
View File

@ -882,6 +882,7 @@ struct se_port {
} ____cacheline_aligned;
struct se_tpg_np {
struct se_portal_group *tpg_np_parent;
struct config_group tpg_np_group;
} ____cacheline_aligned;