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authorLukas Wunner <lukas@wunner.de>2018-09-08 09:59:01 +0200
committerBjorn Helgaas <bhelgaas@google.com>2018-09-18 17:52:15 -0500
commit81c4b5bf30de01a0f6b43ccaa1d220f4a0a5d99c (patch)
tree275be529eee5898b58dd9457b58cc07344692ece
parentd758714235e7abb7984468370c912ca2f4dc4e57 (diff)
PCI: hotplug: Constify hotplug_slot_ops
Hotplug drivers cannot declare their hotplug_slot_ops const, making them attractive targets for attackers, because upon registration of a hotplug slot, __pci_hp_initialize() writes to the "owner" and "mod_name" members in that struct. Fix by moving these members to struct hotplug_slot and constify every driver's hotplug_slot_ops except for pciehp. pciehp constructs its hotplug_slot_ops at runtime based on the PCIe port's capabilities, hence cannot declare them const. It can be converted to __write_rarely once that's mainlined: http://www.openwall.com/lists/kernel-hardening/2016/11/16/3 Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> # drivers/pci/hotplug/rpa* Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com> # drivers/platform/x86 Cc: Len Brown <lenb@kernel.org> Cc: Scott Murray <scott@spiteful.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Oliver OHalloran <oliveroh@au1.ibm.com> Cc: Gavin Shan <gwshan@linux.vnet.ibm.com> Cc: Sebastian Ott <sebott@linux.vnet.ibm.com> Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com> Cc: Corentin Chary <corentin.chary@gmail.com> Cc: Darren Hart <dvhart@infradead.org>
-rw-r--r--drivers/pci/hotplug/acpiphp_core.c2
-rw-r--r--drivers/pci/hotplug/cpci_hotplug_core.c2
-rw-r--r--drivers/pci/hotplug/cpqphp_core.c2
-rw-r--r--drivers/pci/hotplug/ibmphp.h2
-rw-r--r--drivers/pci/hotplug/ibmphp_core.c2
-rw-r--r--drivers/pci/hotplug/pci_hotplug_core.c27
-rw-r--r--drivers/pci/hotplug/pnv_php.c2
-rw-r--r--drivers/pci/hotplug/rpaphp.h2
-rw-r--r--drivers/pci/hotplug/rpaphp_core.c2
-rw-r--r--drivers/pci/hotplug/s390_pci_hpc.c2
-rw-r--r--drivers/pci/hotplug/sgi_hotplug.c2
-rw-r--r--drivers/pci/hotplug/shpchp_core.c2
-rw-r--r--drivers/pci/pci.c4
-rw-r--r--drivers/pci/slot.c2
-rw-r--r--drivers/platform/x86/asus-wmi.c3
-rw-r--r--drivers/platform/x86/eeepc-laptop.c3
-rw-r--r--include/linux/pci_hotplug.h10
17 files changed, 35 insertions, 36 deletions
diff --git a/drivers/pci/hotplug/acpiphp_core.c b/drivers/pci/hotplug/acpiphp_core.c
index ad32ffbc4b91..e883cef0f3bc 100644
--- a/drivers/pci/hotplug/acpiphp_core.c
+++ b/drivers/pci/hotplug/acpiphp_core.c
@@ -57,7 +57,7 @@ static int get_attention_status(struct hotplug_slot *slot, u8 *value);
static int get_latch_status(struct hotplug_slot *slot, u8 *value);
static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
-static struct hotplug_slot_ops acpi_hotplug_slot_ops = {
+static const struct hotplug_slot_ops acpi_hotplug_slot_ops = {
.enable_slot = enable_slot,
.disable_slot = disable_slot,
.set_attention_status = set_attention_status,
diff --git a/drivers/pci/hotplug/cpci_hotplug_core.c b/drivers/pci/hotplug/cpci_hotplug_core.c
index 52a339baf06c..97c32e4c74c8 100644
--- a/drivers/pci/hotplug/cpci_hotplug_core.c
+++ b/drivers/pci/hotplug/cpci_hotplug_core.c
@@ -57,7 +57,7 @@ static int get_attention_status(struct hotplug_slot *slot, u8 *value);
static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
static int get_latch_status(struct hotplug_slot *slot, u8 *value);
-static struct hotplug_slot_ops cpci_hotplug_slot_ops = {
+static const struct hotplug_slot_ops cpci_hotplug_slot_ops = {
.enable_slot = enable_slot,
.disable_slot = disable_slot,
.set_attention_status = set_attention_status,
diff --git a/drivers/pci/hotplug/cpqphp_core.c b/drivers/pci/hotplug/cpqphp_core.c
index 5a06636e910a..3409b62fceac 100644
--- a/drivers/pci/hotplug/cpqphp_core.c
+++ b/drivers/pci/hotplug/cpqphp_core.c
@@ -560,7 +560,7 @@ static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
return 0;
}
-static struct hotplug_slot_ops cpqphp_hotplug_slot_ops = {
+static const struct hotplug_slot_ops cpqphp_hotplug_slot_ops = {
.set_attention_status = set_attention_status,
.enable_slot = process_SI,
.disable_slot = process_SS,
diff --git a/drivers/pci/hotplug/ibmphp.h b/drivers/pci/hotplug/ibmphp.h
index fddb78606c74..db387e10581e 100644
--- a/drivers/pci/hotplug/ibmphp.h
+++ b/drivers/pci/hotplug/ibmphp.h
@@ -740,7 +740,7 @@ int ibmphp_do_disable_slot(struct slot *slot_cur);
int ibmphp_update_slot_info(struct slot *); /* This function is called from HPC, so we need it to not be be static */
int ibmphp_configure_card(struct pci_func *, u8);
int ibmphp_unconfigure_card(struct slot **, int);
-extern struct hotplug_slot_ops ibmphp_hotplug_slot_ops;
+extern const struct hotplug_slot_ops ibmphp_hotplug_slot_ops;
#endif //__IBMPHP_H
diff --git a/drivers/pci/hotplug/ibmphp_core.c b/drivers/pci/hotplug/ibmphp_core.c
index 4ea57e9019f1..b82fdc17040d 100644
--- a/drivers/pci/hotplug/ibmphp_core.c
+++ b/drivers/pci/hotplug/ibmphp_core.c
@@ -1259,7 +1259,7 @@ error:
goto exit;
}
-struct hotplug_slot_ops ibmphp_hotplug_slot_ops = {
+const struct hotplug_slot_ops ibmphp_hotplug_slot_ops = {
.set_attention_status = set_attention_status,
.enable_slot = enable_slot,
.disable_slot = ibmphp_disable_slot,
diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c
index 90fde5f106d8..ede2ed6f4ce0 100644
--- a/drivers/pci/hotplug/pci_hotplug_core.c
+++ b/drivers/pci/hotplug/pci_hotplug_core.c
@@ -49,15 +49,15 @@ static DEFINE_MUTEX(pci_hp_mutex);
#define GET_STATUS(name, type) \
static int get_##name(struct hotplug_slot *slot, type *value) \
{ \
- struct hotplug_slot_ops *ops = slot->ops; \
+ const struct hotplug_slot_ops *ops = slot->ops; \
int retval = 0; \
- if (!try_module_get(ops->owner)) \
+ if (!try_module_get(slot->owner)) \
return -ENODEV; \
if (ops->get_##name) \
retval = ops->get_##name(slot, value); \
else \
*value = slot->info->name; \
- module_put(ops->owner); \
+ module_put(slot->owner); \
return retval; \
}
@@ -90,7 +90,7 @@ static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
power = (u8)(lpower & 0xff);
dbg("power = %d\n", power);
- if (!try_module_get(slot->ops->owner)) {
+ if (!try_module_get(slot->owner)) {
retval = -ENODEV;
goto exit;
}
@@ -109,7 +109,7 @@ static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
err("Illegal value specified for power\n");
retval = -EINVAL;
}
- module_put(slot->ops->owner);
+ module_put(slot->owner);
exit:
if (retval)
@@ -138,7 +138,8 @@ static ssize_t attention_read_file(struct pci_slot *pci_slot, char *buf)
static ssize_t attention_write_file(struct pci_slot *pci_slot, const char *buf,
size_t count)
{
- struct hotplug_slot_ops *ops = pci_slot->hotplug->ops;
+ struct hotplug_slot *slot = pci_slot->hotplug;
+ const struct hotplug_slot_ops *ops = slot->ops;
unsigned long lattention;
u8 attention;
int retval = 0;
@@ -147,13 +148,13 @@ static ssize_t attention_write_file(struct pci_slot *pci_slot, const char *buf,
attention = (u8)(lattention & 0xff);
dbg(" - attention = %d\n", attention);
- if (!try_module_get(ops->owner)) {
+ if (!try_module_get(slot->owner)) {
retval = -ENODEV;
goto exit;
}
if (ops->set_attention_status)
- retval = ops->set_attention_status(pci_slot->hotplug, attention);
- module_put(ops->owner);
+ retval = ops->set_attention_status(slot, attention);
+ module_put(slot->owner);
exit:
if (retval)
@@ -213,13 +214,13 @@ static ssize_t test_write_file(struct pci_slot *pci_slot, const char *buf,
test = (u32)(ltest & 0xffffffff);
dbg("test = %d\n", test);
- if (!try_module_get(slot->ops->owner)) {
+ if (!try_module_get(slot->owner)) {
retval = -ENODEV;
goto exit;
}
if (slot->ops->hardware_test)
retval = slot->ops->hardware_test(slot, test);
- module_put(slot->ops->owner);
+ module_put(slot->owner);
exit:
if (retval)
@@ -447,8 +448,8 @@ int __pci_hp_initialize(struct hotplug_slot *slot, struct pci_bus *bus,
if ((slot->info == NULL) || (slot->ops == NULL))
return -EINVAL;
- slot->ops->owner = owner;
- slot->ops->mod_name = mod_name;
+ slot->owner = owner;
+ slot->mod_name = mod_name;
/*
* No problems if we call this interface from both ACPI_PCI_SLOT
diff --git a/drivers/pci/hotplug/pnv_php.c b/drivers/pci/hotplug/pnv_php.c
index 3276a5e4c430..12b92a0ff688 100644
--- a/drivers/pci/hotplug/pnv_php.c
+++ b/drivers/pci/hotplug/pnv_php.c
@@ -530,7 +530,7 @@ static int pnv_php_disable_slot(struct hotplug_slot *slot)
return ret;
}
-static struct hotplug_slot_ops php_slot_ops = {
+static const struct hotplug_slot_ops php_slot_ops = {
.get_power_status = pnv_php_get_power_state,
.get_adapter_status = pnv_php_get_adapter_state,
.set_attention_status = pnv_php_set_attention_state,
diff --git a/drivers/pci/hotplug/rpaphp.h b/drivers/pci/hotplug/rpaphp.h
index c8311724bd76..f83347819f7b 100644
--- a/drivers/pci/hotplug/rpaphp.h
+++ b/drivers/pci/hotplug/rpaphp.h
@@ -70,7 +70,7 @@ struct slot {
struct hotplug_slot *hotplug_slot;
};
-extern struct hotplug_slot_ops rpaphp_hotplug_slot_ops;
+extern const struct hotplug_slot_ops rpaphp_hotplug_slot_ops;
extern struct list_head rpaphp_slot_head;
/* function prototypes */
diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c
index 857c358b727b..8620a3f8c987 100644
--- a/drivers/pci/hotplug/rpaphp_core.c
+++ b/drivers/pci/hotplug/rpaphp_core.c
@@ -477,7 +477,7 @@ static int disable_slot(struct hotplug_slot *hotplug_slot)
return 0;
}
-struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
+const struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
.enable_slot = enable_slot,
.disable_slot = disable_slot,
.set_attention_status = set_attention_status,
diff --git a/drivers/pci/hotplug/s390_pci_hpc.c b/drivers/pci/hotplug/s390_pci_hpc.c
index 93b5341d282c..5bd45fd4a92a 100644
--- a/drivers/pci/hotplug/s390_pci_hpc.c
+++ b/drivers/pci/hotplug/s390_pci_hpc.c
@@ -130,7 +130,7 @@ static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
return 0;
}
-static struct hotplug_slot_ops s390_hotplug_slot_ops = {
+static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
.enable_slot = enable_slot,
.disable_slot = disable_slot,
.get_power_status = get_power_status,
diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c
index babd23409f61..af4c28c574dd 100644
--- a/drivers/pci/hotplug/sgi_hotplug.c
+++ b/drivers/pci/hotplug/sgi_hotplug.c
@@ -80,7 +80,7 @@ static int enable_slot(struct hotplug_slot *slot);
static int disable_slot(struct hotplug_slot *slot);
static inline int get_power_status(struct hotplug_slot *slot, u8 *value);
-static struct hotplug_slot_ops sn_hotplug_slot_ops = {
+static const struct hotplug_slot_ops sn_hotplug_slot_ops = {
.enable_slot = enable_slot,
.disable_slot = disable_slot,
.get_power_status = get_power_status,
diff --git a/drivers/pci/hotplug/shpchp_core.c b/drivers/pci/hotplug/shpchp_core.c
index 97cee23f3d51..26cbea04237c 100644
--- a/drivers/pci/hotplug/shpchp_core.c
+++ b/drivers/pci/hotplug/shpchp_core.c
@@ -51,7 +51,7 @@ static int get_attention_status(struct hotplug_slot *slot, u8 *value);
static int get_latch_status(struct hotplug_slot *slot, u8 *value);
static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
-static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
+static const struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
.set_attention_status = set_attention_status,
.enable_slot = enable_slot,
.disable_slot = disable_slot,
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 1835f3a7aa8d..0e54588825cb 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4571,13 +4571,13 @@ static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe)
{
int rc = -ENOTTY;
- if (!hotplug || !try_module_get(hotplug->ops->owner))
+ if (!hotplug || !try_module_get(hotplug->owner))
return rc;
if (hotplug->ops->reset_slot)
rc = hotplug->ops->reset_slot(hotplug, probe);
- module_put(hotplug->ops->owner);
+ module_put(hotplug->owner);
return rc;
}
diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c
index e634229ece89..145cd953b518 100644
--- a/drivers/pci/slot.c
+++ b/drivers/pci/slot.c
@@ -371,7 +371,7 @@ void pci_hp_create_module_link(struct pci_slot *pci_slot)
if (!slot || !slot->ops)
return;
- kobj = kset_find_obj(module_kset, slot->ops->mod_name);
+ kobj = kset_find_obj(module_kset, slot->mod_name);
if (!kobj)
return;
ret = sysfs_create_link(&pci_slot->kobj, kobj, "module");
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 2d6e272315a8..a8aa2eadfd82 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -868,8 +868,7 @@ static int asus_get_adapter_status(struct hotplug_slot *hotplug_slot,
return 0;
}
-static struct hotplug_slot_ops asus_hotplug_slot_ops = {
- .owner = THIS_MODULE,
+static const struct hotplug_slot_ops asus_hotplug_slot_ops = {
.get_adapter_status = asus_get_adapter_status,
.get_power_status = asus_get_adapter_status,
};
diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
index a4bbf6ecd1f0..41a364376e91 100644
--- a/drivers/platform/x86/eeepc-laptop.c
+++ b/drivers/platform/x86/eeepc-laptop.c
@@ -726,8 +726,7 @@ static int eeepc_get_adapter_status(struct hotplug_slot *hotplug_slot,
return 0;
}
-static struct hotplug_slot_ops eeepc_hotplug_slot_ops = {
- .owner = THIS_MODULE,
+static const struct hotplug_slot_ops eeepc_hotplug_slot_ops = {
.get_adapter_status = eeepc_get_adapter_status,
.get_power_status = eeepc_get_adapter_status,
};
diff --git a/include/linux/pci_hotplug.h b/include/linux/pci_hotplug.h
index a6d6650a0490..372dbe95c207 100644
--- a/include/linux/pci_hotplug.h
+++ b/include/linux/pci_hotplug.h
@@ -16,8 +16,6 @@
/**
* struct hotplug_slot_ops -the callbacks that the hotplug pci core can use
- * @owner: The module owner of this structure
- * @mod_name: The module name (KBUILD_MODNAME) of this structure
* @enable_slot: Called when the user wants to enable a specific pci slot
* @disable_slot: Called when the user wants to disable a specific pci slot
* @set_attention_status: Called to set the specific slot's attention LED to
@@ -46,8 +44,6 @@
* set an LED, enable / disable power, etc.)
*/
struct hotplug_slot_ops {
- struct module *owner;
- const char *mod_name;
int (*enable_slot) (struct hotplug_slot *slot);
int (*disable_slot) (struct hotplug_slot *slot);
int (*set_attention_status) (struct hotplug_slot *slot, u8 value);
@@ -82,15 +78,19 @@ struct hotplug_slot_info {
* this slot.
* @private: used by the hotplug pci controller driver to store whatever it
* needs.
+ * @owner: The module owner of this structure
+ * @mod_name: The module name (KBUILD_MODNAME) of this structure
*/
struct hotplug_slot {
- struct hotplug_slot_ops *ops;
+ const struct hotplug_slot_ops *ops;
struct hotplug_slot_info *info;
void *private;
/* Variables below this are for use only by the hotplug pci core. */
struct list_head slot_list;
struct pci_slot *pci_slot;
+ struct module *owner;
+ const char *mod_name;
};
static inline const char *hotplug_slot_name(const struct hotplug_slot *slot)