| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20170123073849.28352-1-dmitry.torokhov@gmail.com>
Date: Sun, 22 Jan 2017 23:38:48 -0800
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc: linux-kernel@...r.kernel.org,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Hans de Goede <hdegoede@...hat.com>
Subject: [PATCH 1/2] device property: export code duplicating array of property entries
When augmenting ACPI-enumerated devices with additional property data based
on DMI info, a module has often several potential property sets, with only
one being active on a given box. In order to save memory it should be
possible to mark everything and __initdata or __initconst, execute DMI
match early, and duplicate relevant properties. Then kernel will discard
the rest of them.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
drivers/base/property.c | 124 +++++++++++++++++++++++++++--------------------
include/linux/property.h | 3 ++
2 files changed, 75 insertions(+), 52 deletions(-)
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 43a36d68c3fd..ee22ded63e06 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -682,41 +682,8 @@ int fwnode_property_match_string(struct fwnode_handle *fwnode,
}
EXPORT_SYMBOL_GPL(fwnode_property_match_string);
-/**
- * pset_free_set - releases memory allocated for copied property set
- * @pset: Property set to release
- *
- * Function takes previously copied property set and releases all the
- * memory allocated to it.
- */
-static void pset_free_set(struct property_set *pset)
-{
- const struct property_entry *prop;
- size_t i, nval;
-
- if (!pset)
- return;
-
- for (prop = pset->properties; prop->name; prop++) {
- if (prop->is_array) {
- if (prop->is_string && prop->pointer.str) {
- nval = prop->length / sizeof(const char *);
- for (i = 0; i < nval; i++)
- kfree(prop->pointer.str[i]);
- }
- kfree(prop->pointer.raw_data);
- } else if (prop->is_string) {
- kfree(prop->value.str);
- }
- kfree(prop->name);
- }
-
- kfree(pset->properties);
- kfree(pset);
-}
-
-static int pset_copy_entry(struct property_entry *dst,
- const struct property_entry *src)
+static int property_entry_copy(struct property_entry *dst,
+ const struct property_entry *src)
{
const char **d, **s;
size_t i, nval;
@@ -765,6 +732,71 @@ static int pset_copy_entry(struct property_entry *dst,
}
/**
+ * property_entries_dup - duplicate array of properties
+ * @properties: array of properties to copy
+ *
+ * This function creates a deep copy of the given NULL-terminated array
+ * of property entries.
+ */
+struct property_entry *property_entries_dup(
+ const struct property_entry *properties)
+{
+ struct property_entry *p;
+ int i, n = 0;
+
+ while (properties[n].name)
+ n++;
+
+ p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < n; i++) {
+ int ret = property_entry_copy(&p[i], &properties[i]);
+ if (ret) {
+ kfree(p);
+ return ERR_PTR(ret);
+ }
+ }
+
+ return p;
+}
+EXPORT_SYMBOL_GPL(property_entries_dup);
+
+/**
+ * pset_free_set - releases memory allocated for copied property set
+ * @pset: Property set to release
+ *
+ * Function takes previously copied property set and releases all the
+ * memory allocated to it.
+ */
+static void pset_free_set(struct property_set *pset)
+{
+ const struct property_entry *prop;
+ size_t i, nval;
+
+ if (!pset)
+ return;
+
+ for (prop = pset->properties; prop->name; prop++) {
+ if (prop->is_array) {
+ if (prop->is_string && prop->pointer.str) {
+ nval = prop->length / sizeof(const char *);
+ for (i = 0; i < nval; i++)
+ kfree(prop->pointer.str[i]);
+ }
+ kfree(prop->pointer.raw_data);
+ } else if (prop->is_string) {
+ kfree(prop->value.str);
+ }
+ kfree(prop->name);
+ }
+
+ kfree(pset->properties);
+ kfree(pset);
+}
+
+/**
* pset_copy_set - copies property set
* @pset: Property set to copy
*
@@ -776,32 +808,20 @@ static int pset_copy_entry(struct property_entry *dst,
*/
static struct property_set *pset_copy_set(const struct property_set *pset)
{
- const struct property_entry *entry;
+ struct property_entry *properties;
struct property_set *p;
- size_t i, n = 0;
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return ERR_PTR(-ENOMEM);
- while (pset->properties[n].name)
- n++;
-
- p->properties = kcalloc(n + 1, sizeof(*entry), GFP_KERNEL);
- if (!p->properties) {
+ properties = property_entries_dup(pset->properties);
+ if (IS_ERR(properties)) {
kfree(p);
- return ERR_PTR(-ENOMEM);
- }
-
- for (i = 0; i < n; i++) {
- int ret = pset_copy_entry(&p->properties[i],
- &pset->properties[i]);
- if (ret) {
- pset_free_set(p);
- return ERR_PTR(ret);
- }
+ return ERR_CAST(properties);
}
+ p->properties = properties;
return p;
}
diff --git a/include/linux/property.h b/include/linux/property.h
index 856e50b2140c..f7fa5891a8c3 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -241,6 +241,9 @@ struct property_entry {
.name = _name_, \
}
+struct property_entry *property_entries_dup(
+ const struct property_entry *properties);
+
int device_add_properties(struct device *dev,
struct property_entry *properties);
void device_remove_properties(struct device *dev);
--
2.11.0.483.g087da7b7c-goog
Powered by blists - more mailing lists