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RDMA/srpt: Fix a use-after-free 

Change the LIO port members inside struct srpt_port from regular members
into pointers. Allocate the LIO port data structures from inside
srpt_make_tport() and free these from inside srpt_make_tport(). Keep
struct srpt_device as long as either an RDMA port or a LIO target port is
associated with it. This patch decouples the lifetime of struct srpt_port
(controlled by the RDMA core) and struct srpt_port_id (controlled by LIO).
This patch fixes the following KASAN complaint:

  BUG: KASAN: use-after-free in srpt_enable_tpg+0x31/0x70 [ib_srpt]
  Read of size 8 at addr ffff888141cc34b8 by task check/5093

  Call Trace:
   <TASK>
   show_stack+0x4e/0x53
   dump_stack_lvl+0x51/0x66
   print_address_description.constprop.0.cold+0xea/0x41e
   print_report.cold+0x90/0x205
   kasan_report+0xb9/0xf0
   __asan_load8+0x69/0x90
   srpt_enable_tpg+0x31/0x70 [ib_srpt]
   target_fabric_tpg_base_enable_store+0xe2/0x140 [target_core_mod]
   configfs_write_iter+0x18b/0x210
   new_sync_write+0x1f2/0x2f0
   vfs_write+0x3e3/0x540
   ksys_write+0xbb/0x140
   __x64_sys_write+0x42/0x50
   do_syscall_64+0x34/0x80
   entry_SYSCALL_64_after_hwframe+0x46/0xb0
   </TASK>

Link: https://lore.kernel.org/r/20220727193415.1583860-4-bvanassche@acm.org
Reported-by: Li Zhijian <lizhijian@fujitsu.com>
Tested-by: Li Zhijian <lizhijian@fujitsu.com>
Fixes: a42d985bd5 ("ib_srpt: Initial SRP Target merge for v3.3-rc1")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Bart Van Assche 2022-07-27 12:34:15 -07:00 committed by Jason Gunthorpe
parent aa7dfbb41b
commit b5605148e6
2 changed files with 94 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

130
drivers/infiniband/ulp/srpt/ib_srpt.c
View File

@ -565,18 +565,12 @@ static int srpt_refresh_port(struct srpt_port *sport)
if (ret)
return ret;
sport->port_guid_id.wwn.priv = sport;
srpt_format_guid(sport->guid_name, ARRAY_SIZE(sport->guid_name),
&sport->gid.global.interface_id);
memcpy(sport->port_guid_id.name, sport->guid_name,
ARRAY_SIZE(sport->guid_name));
sport->port_gid_id.wwn.priv = sport;
snprintf(sport->gid_name, ARRAY_SIZE(sport->gid_name),
"0x%016llx%016llx",
be64_to_cpu(sport->gid.global.subnet_prefix),
be64_to_cpu(sport->gid.global.interface_id));
memcpy(sport->port_gid_id.name, sport->gid_name,
ARRAY_SIZE(sport->gid_name));
if (rdma_protocol_iwarp(sport->sdev->device, sport->port))
return 0;
@ -2317,31 +2311,35 @@ static int srpt_cm_req_recv(struct srpt_device *const sdev,
tag_num = ch->rq_size;
tag_size = 1; /* ib_srpt does not use se_sess->sess_cmd_map */
mutex_lock(&sport->port_guid_id.mutex);
list_for_each_entry(stpg, &sport->port_guid_id.tpg_list, entry) {
if (!IS_ERR_OR_NULL(ch->sess))
break;
ch->sess = target_setup_session(&stpg->tpg, tag_num,
if (sport->guid_id) {
mutex_lock(&sport->guid_id->mutex);
list_for_each_entry(stpg, &sport->guid_id->tpg_list, entry) {
if (!IS_ERR_OR_NULL(ch->sess))
break;
ch->sess = target_setup_session(&stpg->tpg, tag_num,
tag_size, TARGET_PROT_NORMAL,
ch->sess_name, ch, NULL);
}
mutex_unlock(&sport->guid_id->mutex);
}
mutex_unlock(&sport->port_guid_id.mutex);
mutex_lock(&sport->port_gid_id.mutex);
list_for_each_entry(stpg, &sport->port_gid_id.tpg_list, entry) {
if (!IS_ERR_OR_NULL(ch->sess))
break;
ch->sess = target_setup_session(&stpg->tpg, tag_num,
if (sport->gid_id) {
mutex_lock(&sport->gid_id->mutex);
list_for_each_entry(stpg, &sport->gid_id->tpg_list, entry) {
if (!IS_ERR_OR_NULL(ch->sess))
break;
ch->sess = target_setup_session(&stpg->tpg, tag_num,
tag_size, TARGET_PROT_NORMAL, i_port_id,
ch, NULL);
if (!IS_ERR_OR_NULL(ch->sess))
break;
/* Retry without leading "0x" */
ch->sess = target_setup_session(&stpg->tpg, tag_num,
if (!IS_ERR_OR_NULL(ch->sess))
break;
/* Retry without leading "0x" */
ch->sess = target_setup_session(&stpg->tpg, tag_num,
tag_size, TARGET_PROT_NORMAL,
i_port_id + 2, ch, NULL);
}
mutex_unlock(&sport->gid_id->mutex);
}
mutex_unlock(&sport->port_gid_id.mutex);
if (IS_ERR_OR_NULL(ch->sess)) {
WARN_ON_ONCE(ch->sess == NULL);
@ -2986,7 +2984,12 @@ static int srpt_release_sport(struct srpt_port *sport)
return 0;
}
static struct se_wwn *__srpt_lookup_wwn(const char *name)
struct port_and_port_id {
struct srpt_port *sport;
struct srpt_port_id **port_id;
};
static struct port_and_port_id __srpt_lookup_port(const char *name)
{
struct ib_device *dev;
struct srpt_device *sdev;
@ -3001,25 +3004,38 @@ static struct se_wwn *__srpt_lookup_wwn(const char *name)
for (i = 0; i < dev->phys_port_cnt; i++) {
sport = &sdev->port[i];
if (strcmp(sport->port_guid_id.name, name) == 0)
return &sport->port_guid_id.wwn;
if (strcmp(sport->port_gid_id.name, name) == 0)
return &sport->port_gid_id.wwn;
if (strcmp(sport->guid_name, name) == 0) {
kref_get(&sdev->refcnt);
return (struct port_and_port_id){
sport, &sport->guid_id};
}
if (strcmp(sport->gid_name, name) == 0) {
kref_get(&sdev->refcnt);
return (struct port_and_port_id){
sport, &sport->gid_id};
}
}
}
return NULL;
return (struct port_and_port_id){};
}
static struct se_wwn *srpt_lookup_wwn(const char *name)
/**
* srpt_lookup_port() - Look up an RDMA port by name
* @name: ASCII port name
*
* Increments the RDMA port reference count if an RDMA port pointer is returned.
* The caller must drop that reference count by calling srpt_port_put_ref().
*/
static struct port_and_port_id srpt_lookup_port(const char *name)
{
struct se_wwn *wwn;
struct port_and_port_id papi;
spin_lock(&srpt_dev_lock);
wwn = __srpt_lookup_wwn(name);
papi = __srpt_lookup_port(name);
spin_unlock(&srpt_dev_lock);
return wwn;
return papi;
}
static void srpt_free_srq(struct srpt_device *sdev)
@ -3198,10 +3214,6 @@ static int srpt_add_one(struct ib_device *device)
sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
sport->port_attrib.use_srq = false;
INIT_WORK(&sport->work, srpt_refresh_port_work);
mutex_init(&sport->port_guid_id.mutex);
INIT_LIST_HEAD(&sport->port_guid_id.tpg_list);
mutex_init(&sport->port_gid_id.mutex);
INIT_LIST_HEAD(&sport->port_gid_id.tpg_list);
ret = srpt_refresh_port(sport);
if (ret) {
@ -3302,10 +3314,10 @@ static struct srpt_port_id *srpt_wwn_to_sport_id(struct se_wwn *wwn)
{
struct srpt_port *sport = wwn->priv;
if (wwn == &sport->port_guid_id.wwn)
return &sport->port_guid_id;
if (wwn == &sport->port_gid_id.wwn)
return &sport->port_gid_id;
if (sport->guid_id && &sport->guid_id->wwn == wwn)
return sport->guid_id;
if (sport->gid_id && &sport->gid_id->wwn == wwn)
return sport->gid_id;
WARN_ON_ONCE(true);
return NULL;
}
@ -3790,7 +3802,31 @@ static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
struct config_group *group,
const char *name)
{
return srpt_lookup_wwn(name) ? : ERR_PTR(-EINVAL);
struct port_and_port_id papi = srpt_lookup_port(name);
struct srpt_port *sport = papi.sport;
struct srpt_port_id *port_id;
if (!papi.port_id)
return ERR_PTR(-EINVAL);
if (*papi.port_id) {
/* Attempt to create a directory that already exists. */
WARN_ON_ONCE(true);
return &(*papi.port_id)->wwn;
}
port_id = kzalloc(sizeof(*port_id), GFP_KERNEL);
if (!port_id) {
srpt_sdev_put(sport->sdev);
return ERR_PTR(-ENOMEM);
}
mutex_init(&port_id->mutex);
INIT_LIST_HEAD(&port_id->tpg_list);
port_id->wwn.priv = sport;
memcpy(port_id->name, port_id == sport->guid_id ? sport->guid_name :
sport->gid_name, ARRAY_SIZE(port_id->name));
*papi.port_id = port_id;
return &port_id->wwn;
}
/**
@ -3799,6 +3835,18 @@ static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
*/
static void srpt_drop_tport(struct se_wwn *wwn)
{
struct srpt_port_id *port_id = container_of(wwn, typeof(*port_id), wwn);
struct srpt_port *sport = wwn->priv;
if (sport->guid_id == port_id)
sport->guid_id = NULL;
else if (sport->gid_id == port_id)
sport->gid_id = NULL;
else
WARN_ON_ONCE(true);
srpt_sdev_put(sport->sdev);
kfree(port_id);
}
static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf)

10
drivers/infiniband/ulp/srpt/ib_srpt.h
View File

@ -393,7 +393,7 @@ struct srpt_port_id {
};
/**
* struct srpt_port - information associated by SRPT with a single IB port
* struct srpt_port - SRPT RDMA port information
* @sdev: backpointer to the HCA information.
* @mad_agent: per-port management datagram processing information.
* @enabled: Whether or not this target port is enabled.
@ -403,9 +403,9 @@ struct srpt_port_id {
* @gid: cached value of the port's gid.
* @work: work structure for refreshing the aforementioned cached values.
* @guid_name: port name in GUID format.
* @port_guid_id: LIO target port information for the port name in GUID format.
* @guid_id: LIO target port information for the port name in GUID format.
* @gid_name: port name in GID format.
* @port_gid_id: LIO target port information for the port name in GID format.
* @gid_id: LIO target port information for the port name in GID format.
* @port_attrib: Port attributes that can be accessed through configfs.
* @refcount: Number of objects associated with this port.
* @freed_channels: Completion that will be signaled once @refcount becomes 0.
@ -422,9 +422,9 @@ struct srpt_port {
union ib_gid gid;
struct work_struct work;
char guid_name[64];
struct srpt_port_id port_guid_id;
struct srpt_port_id *guid_id;
char gid_name[64];
struct srpt_port_id port_gid_id;
struct srpt_port_id *gid_id;
struct srpt_port_attrib port_attrib;
atomic_t refcount;
struct completion *freed_channels;