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authorMatt Fleming <matt.fleming@intel.com>2014-03-17 09:17:28 +0000
committerMatt Fleming <matt.fleming@intel.com>2014-04-17 13:53:34 +0100
commite003bbee2a6a19a4c733335989284caf1b179e0d (patch)
tree80c92271ca01ceaabdbd43d13bcda29b11789b2a /drivers/firmware/efi
parentbafc84d539c0ffa916037840df54428623abc3e6 (diff)
efivars: Check size of user object
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>
Diffstat (limited to 'drivers/firmware/efi')
-rw-r--r--drivers/firmware/efi/efivars.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index 06ec6ee1c58..2c21cccc257 100644
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -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;