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efivarfs: Use query_variable_info() to limit kmalloc()

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We don't want someone who can write EFI variables to be able to
allocate arbitrarily large amounts of memory, so cap it to something
sensible like the amount of free space for EFI variables.

Acked-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Matt Fleming 2012-11-09 21:02:56 +00:00
parent cfcf2f1170
commit 89d16665d3
2 changed files with 35 additions and 9 deletions
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include/linux/efi.h
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@ -646,6 +646,7 @@ struct efivar_operations {
efi_get_variable_t *get_variable;
efi_get_next_variable_t *get_next_variable;
efi_set_variable_t *set_variable;
efi_query_variable_info_t *query_variable_info;
};
struct efivars {