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efi_loader: initialise partition_signature memory

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Zero partition_signature in the efi_device_path_hard_drive_path
structure when signature_type is 0 (no signature) as required by the
UEFI specification.

This is required so that efi_dp_match() will work as expected
when doing memcmp() comparisons.  Previously uninitialised memory
would cause it not match nodes when it should have when the signature
type was not GUID.

Corrects a problem where the loaded image protocol would not return a
device path with MEDIA_DEVICE causing the OpenBSD bootloader to fail
on rpi_3 and other targets.

v2: Also handle signature_type 1 (MBR) as described in the specification

Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Tested-by: Artturi Alm <artturi.alm@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Jonathan Gray
2017-11-22 14:18:59 +11:00
committed by Alexander Graf
parent ebb4dd5bc3
commit b6e9e09770
1 changed files with 19 additions and 2 deletions
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21
lib/efi_loader/efi_device_path.c
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@@ -428,10 +428,27 @@ static void *dp_part_fill(void *buf, struct blk_desc *desc, int part)
hddp->partmap_type = 2;
else
hddp->partmap_type = 1;
hddp->signature_type = desc->sig_type;
if (hddp->signature_type != 0)
switch (desc->sig_type) {
case SIG_TYPE_NONE:
default:
hddp->signature_type = 0;
memset(hddp->partition_signature, 0,
sizeof(hddp->partition_signature));
break;
case SIG_TYPE_MBR:
hddp->signature_type = 1;
memset(hddp->partition_signature, 0,
sizeof(hddp->partition_signature));
memcpy(hddp->partition_signature, &desc->mbr_sig,
sizeof(desc->mbr_sig));
break;
case SIG_TYPE_GUID:
hddp->signature_type = 2;
memcpy(hddp->partition_signature, &desc->guid_sig,
sizeof(hddp->partition_signature));
break;
}
buf = &hddp[1];
}