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efivars: Use local variables instead of a pointer dereference 

In order to support a compat interface we need to stop passing pointers
to structures around, since the type of structure is going to depend on
whether the current task is a compat task.

Cc: Mike Waychison <mikew@google.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Matt Fleming 2014-03-16 12:14:49 +00:00
parent b738c6ea49
commit bafc84d539
1 changed files with 35 additions and 13 deletions
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48
drivers/firmware/efi/efivars.c
View File

@ -197,37 +197,48 @@ static ssize_t
efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
{
struct efi_variable *new_var, *var = &entry->var;
efi_char16_t *name;
unsigned long size;
efi_guid_t vendor;
u32 attributes;
u8 *data;
int err;
if (count != sizeof(struct efi_variable))
return -EINVAL;
new_var = (struct efi_variable *)buf;
attributes = new_var->Attributes;
vendor = new_var->VendorGuid;
name = new_var->VariableName;
size = new_var->DataSize;
data = new_var->Data;
/*
* If only updating the variable data, then the name
* and guid should remain the same
*/
if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) ||
efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) {
if (memcmp(name, var->VariableName, sizeof(var->VariableName)) ||
efi_guidcmp(vendor, var->VendorGuid)) {
printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n");
return -EINVAL;
}
if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){
if ((size <= 0) || (attributes == 0)){
printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n");
return -EINVAL;
}
if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
efivar_validate(new_var, data, size) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
memcpy(&entry->var, new_var, count);
err = efivar_entry_set(entry, new_var->Attributes,
new_var->DataSize, new_var->Data, NULL);
err = efivar_entry_set(entry, attributes, size, data, NULL);
if (err) {
printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err);
return -EIO;
@ -328,13 +339,20 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
{
struct efi_variable *new_var = (struct efi_variable *)buf;
struct efivar_entry *new_entry;
unsigned long size;
u32 attributes;
u8 *data;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
attributes = new_var->Attributes;
size = new_var->DataSize;
data = new_var->Data;
if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
efivar_validate(new_var, data, size) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
@ -345,8 +363,8 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
memcpy(&new_entry->var, new_var, sizeof(*new_var));
err = efivar_entry_set(new_entry, new_var->Attributes, new_var->DataSize,
new_var->Data, &efivar_sysfs_list);
err = efivar_entry_set(new_entry, attributes, size,
data, &efivar_sysfs_list);
if (err) {
if (err == -EEXIST)
err = -EINVAL;
@ -370,14 +388,18 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
{
struct efi_variable *del_var = (struct efi_variable *)buf;
struct efivar_entry *entry;
efi_char16_t *name;
efi_guid_t vendor;
int err = 0;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
name = del_var->VariableName;
vendor = del_var->VendorGuid;
efivar_entry_iter_begin();
entry = efivar_entry_find(del_var->VariableName, del_var->VendorGuid,
&efivar_sysfs_list, true);
entry = efivar_entry_find(name, vendor, &efivar_sysfs_list, true);
if (!entry)
err = -EINVAL;
else if (__efivar_entry_delete(entry))