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Driver core: change add_uevent_var to use a struct

Browse source 
This changes the uevent buffer functions to use a struct instead of a
long list of parameters. It does no longer require the caller to do the
proper buffer termination and size accounting, which is currently wrong
in some places. It fixes a known bug where parts of the uevent
environment are overwritten because of wrong index calculations.

Many thanks to Mathieu Desnoyers for finding bugs and improving the
error handling.

Signed-off-by: Kay Sievers <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Cornelia Huck <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Kay Sievers 2007-08-14 15:15:12 +02:00 • committed by Greg Kroah-Hartman
commit 7eff2e7a8b
47 changed files with 300 additions and 636 deletions
Download patch file Download diff file Expand all files Collapse all files

42
drivers/base/class.c
View file

@ -180,8 +180,7 @@ static void class_device_create_release(struct class_device *class_dev)
/* needed to allow these devices to have parent class devices */
static int class_device_create_uevent(struct class_device *class_dev,
char **envp, int num_envp,
char *buffer, int buffer_size)
struct kobj_uevent_env *env)
{
pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
return 0;
@ -403,64 +402,43 @@ static void remove_deprecated_class_device_links(struct class_device *cd)
{ }
#endif
static int class_uevent(struct kset *kset, struct kobject *kobj, char **envp,
int num_envp, char *buffer, int buffer_size)
static int class_uevent(struct kset *kset, struct kobject *kobj,
struct kobj_uevent_env *env)
{
struct class_device *class_dev = to_class_dev(kobj);
struct device *dev = class_dev->dev;
int i = 0;
int length = 0;
int retval = 0;
pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
if (MAJOR(class_dev->devt)) {
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"MAJOR=%u", MAJOR(class_dev->devt));
add_uevent_var(env, "MAJOR=%u", MAJOR(class_dev->devt));
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"MINOR=%u", MINOR(class_dev->devt));
add_uevent_var(env, "MINOR=%u", MINOR(class_dev->devt));
}
if (dev) {
const char *path = kobject_get_path(&dev->kobj, GFP_KERNEL);
if (path) {
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"PHYSDEVPATH=%s", path);
add_uevent_var(env, "PHYSDEVPATH=%s", path);
kfree(path);
}
if (dev->bus)
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"PHYSDEVBUS=%s", dev->bus->name);
add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
if (dev->driver)
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"PHYSDEVDRIVER=%s", dev->driver->name);
add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name);
}
/* terminate, set to next free slot, shrink available space */
envp[i] = NULL;
envp = &envp[i];
num_envp -= i;
buffer = &buffer[length];
buffer_size -= length;
if (class_dev->uevent) {
/* have the class device specific function add its stuff */
retval = class_dev->uevent(class_dev, envp, num_envp,
buffer, buffer_size);
retval = class_dev->uevent(class_dev, env);
if (retval)
pr_debug("class_dev->uevent() returned %d\n", retval);
} else if (class_dev->class->uevent) {
/* have the class specific function add its stuff */
retval = class_dev->class->uevent(class_dev, envp, num_envp,
buffer, buffer_size);
retval = class_dev->class->uevent(class_dev, env);
if (retval)
pr_debug("class->uevent() returned %d\n", retval);
}

84
drivers/base/core.c
View file

@ -141,33 +141,23 @@ static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
return NULL;
}
static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp,
int num_envp, char *buffer, int buffer_size)
static int dev_uevent(struct kset *kset, struct kobject *kobj,
struct kobj_uevent_env *env)
{
struct device *dev = to_dev(kobj);
int i = 0;
int length = 0;
int retval = 0;
/* add the major/minor if present */
if (MAJOR(dev->devt)) {
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"MAJOR=%u", MAJOR(dev->devt));
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"MINOR=%u", MINOR(dev->devt));
add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
}
if (dev->type && dev->type->name)
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"DEVTYPE=%s", dev->type->name);
add_uevent_var(env, "DEVTYPE=%s", dev->type->name);
if (dev->driver)
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"DRIVER=%s", dev->driver->name);
add_uevent_var(env, "DRIVER=%s", dev->driver->name);
#ifdef CONFIG_SYSFS_DEPRECATED
if (dev->class) {
@ -181,59 +171,43 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp,
path = kobject_get_path(&parent->kobj, GFP_KERNEL);
if (path) {
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"PHYSDEVPATH=%s", path);
add_uevent_var(env, "PHYSDEVPATH=%s", path);
kfree(path);
}
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"PHYSDEVBUS=%s", parent->bus->name);
add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name);
if (parent->driver)
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"PHYSDEVDRIVER=%s", parent->driver->name);
add_uevent_var(env, "PHYSDEVDRIVER=%s",
parent->driver->name);
}
} else if (dev->bus) {
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"PHYSDEVBUS=%s", dev->bus->name);
add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
if (dev->driver)
add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"PHYSDEVDRIVER=%s", dev->driver->name);
add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name);
}
#endif
/* terminate, set to next free slot, shrink available space */
envp[i] = NULL;
envp = &envp[i];
num_envp -= i;
buffer = &buffer[length];
buffer_size -= length;
/* have the bus specific function add its stuff */
if (dev->bus && dev->bus->uevent) {
/* have the bus specific function add its stuff */
retval = dev->bus->uevent(dev, envp, num_envp, buffer, buffer_size);
retval = dev->bus->uevent(dev, env);
if (retval)
pr_debug ("%s: bus uevent() returned %d\n",
__FUNCTION__, retval);
}
/* have the class specific function add its stuff */
if (dev->class && dev->class->dev_uevent) {
/* have the class specific function add its stuff */
retval = dev->class->dev_uevent(dev, envp, num_envp, buffer, buffer_size);
retval = dev->class->dev_uevent(dev, env);
if (retval)
pr_debug("%s: class uevent() returned %d\n",
__FUNCTION__, retval);
}
/* have the device type specific fuction add its stuff */
if (dev->type && dev->type->uevent) {
/* have the device type specific fuction add its stuff */
retval = dev->type->uevent(dev, envp, num_envp, buffer, buffer_size);
retval = dev->type->uevent(dev, env);
if (retval)
pr_debug("%s: dev_type uevent() returned %d\n",
__FUNCTION__, retval);
@ -253,9 +227,7 @@ static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
{
struct kobject *top_kobj;
struct kset *kset;
char *envp[32];
char *data = NULL;
char *pos;
struct kobj_uevent_env *env = NULL;
int i;
size_t count = 0;
int retval;
@ -278,26 +250,20 @@ static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
if (!kset->uevent_ops->filter(kset, &dev->kobj))
goto out;
data = (char *)get_zeroed_page(GFP_KERNEL);
if (!data)
env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
if (!env)
return -ENOMEM;
/* let the kset specific function add its keys */
pos = data;
memset(envp, 0, sizeof(envp));
retval = kset->uevent_ops->uevent(kset, &dev->kobj,
envp, ARRAY_SIZE(envp),
pos, PAGE_SIZE);
retval = kset->uevent_ops->uevent(kset, &dev->kobj, env);
if (retval)
goto out;
/* copy keys to file */
for (i = 0; envp[i]; i++) {
pos = &buf[count];
count += sprintf(pos, "%s\n", envp[i]);
}
for (i = 0; i < env->envp_idx; i++)
count += sprintf(&buf[count], "%s\n", env->envp[i]);
out:
free_page((unsigned long)data);
kfree(env);
return count;
}

11
drivers/base/firmware_class.c
View file

@ -88,19 +88,14 @@ static CLASS_ATTR(timeout, 0644, firmware_timeout_show, firmware_timeout_store);
static void fw_dev_release(struct device *dev);
static int firmware_uevent(struct device *dev, char **envp, int num_envp,
char *buffer, int buffer_size)
static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct firmware_priv *fw_priv = dev_get_drvdata(dev);
int i = 0, len = 0;
if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
"FIRMWARE=%s", fw_priv->fw_id))
if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->fw_id))
return -ENOMEM;
if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
"TIMEOUT=%i", loading_timeout))
if (add_uevent_var(env, "TIMEOUT=%i", loading_timeout))
return -ENOMEM;
envp[i] = NULL;
return 0;
}

3
drivers/base/memory.c
View file

@ -34,8 +34,7 @@ static const char *memory_uevent_name(struct kset *kset, struct kobject *kobj)
return MEMORY_CLASS_NAME;
}
static int memory_uevent(struct kset *kset, struct kobject *kobj, char **envp,
int num_envp, char *buffer, int buffer_size)
static int memory_uevent(struct kset *kset, struct kobj_uevent_env *env)
{
int retval = 0;

6
drivers/base/platform.c
View file

@ -529,13 +529,11 @@ static struct device_attribute platform_dev_attrs[] = {
__ATTR_NULL,
};
static int platform_uevent(struct device *dev, char **envp, int num_envp,
char *buffer, int buffer_size)
static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct platform_device *pdev = to_platform_device(dev);
envp[0] = buffer;
snprintf(buffer, buffer_size, "MODALIAS=platform:%s", pdev->name);
add_uevent_var(env, "MODALIAS=platform:%s", pdev->name);
return 0;
}