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efi_loader: efi_dp_check_length()

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We need to check that device paths provided via UEFI variables are not
malformed.

Provide function efi_dp_check_length() to check if a device path has an
end node within a given number of bytes.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt
2020-08-23 10:49:46 +02:00
parent ed0b10722c
commit 5cad4a3093
2 changed files with 35 additions and 0 deletions
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2
include/efi_loader.h
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@@ -631,6 +631,8 @@ efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
const char *path,
struct efi_device_path **device,
struct efi_device_path **file);
ssize_t efi_dp_check_length(const struct efi_device_path *dp,
const size_t maxlen);
#define EFI_DP_TYPE(_dp, _type, _subtype) \
(((_dp)->type == DEVICE_PATH_TYPE_##_type) && \