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efivars: Check size of user object

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Unbelieavably there are no checks to see whether the data structure
passed to 'new_var' and 'del_var' is the size that we expect. Let's add
some for better robustness.

Cc: Mike Waychison <mikew@google.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Matt Fleming 2014-03-17 09:17:28 +00:00
parent bafc84d539
commit e003bbee2a
1 changed files with 6 additions and 0 deletions
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6
drivers/firmware/efi/efivars.c
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@ -347,6 +347,9 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (count != sizeof(*new_var))
return -EINVAL;
attributes = new_var->Attributes;
size = new_var->DataSize;
data = new_var->Data;
@ -395,6 +398,9 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (count != sizeof(*del_var))
return -EINVAL;
name = del_var->VariableName;
vendor = del_var->VendorGuid;