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* Don't leak random kernel memory to EFI variable NVRAM when attempting

Browse source 
to initiate garbage collection. Also, free the kernel memory when
    we're done with it instead of leaking - Ben Hutchings
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Merge tag 'efi-urgent' into x86/urgent

 * Don't leak random kernel memory to EFI variable NVRAM when attempting
   to initiate garbage collection. Also, free the kernel memory when
   we're done with it instead of leaking - Ben Hutchings

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
H. Peter Anvin 2013-06-21 03:01:21 -07:00
commit df91c3513f
1 changed files with 6 additions and 1 deletions
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7
arch/x86/platform/efi/efi.c
View file

@ -1069,7 +1069,10 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
* that by attempting to use more space than is available.
*/
unsigned long dummy_size = remaining_size + 1024;
void *dummy = kmalloc(dummy_size, GFP_ATOMIC);
void *dummy = kzalloc(dummy_size, GFP_ATOMIC);
if (!dummy)
return EFI_OUT_OF_RESOURCES;
status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
EFI_VARIABLE_NON_VOLATILE |
@ -1089,6 +1092,8 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
0, dummy);
}
kfree(dummy);
/*
* The runtime code may now have triggered a garbage collection
* run, so check the variable info again