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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Tue, 30 Jun 2020 10:49:59 -0500
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Subject: [PATCH] kpartx: handle alternate bsd disklabel location
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bsd disk labels can either be at the start of the second sector, or 64
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bytes into the first sector, but kpartx only handled the first case.
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However the second case is what parted creates, and what the linux
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kernel partition code expects. kpartx should handle both cases.
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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kpartx/bsd.c | 16 ++++++++++++++--
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1 file changed, 14 insertions(+), 2 deletions(-)
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diff --git a/kpartx/bsd.c b/kpartx/bsd.c
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index 0e661fbc..950b0f92 100644
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--- a/kpartx/bsd.c
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+++ b/kpartx/bsd.c
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@@ -1,6 +1,7 @@
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#include "kpartx.h"
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#include <stdio.h>
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+#define BSD_LABEL_OFFSET 64
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#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
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#define XBSD_MAXPARTITIONS 16
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#define BSD_FS_UNUSED 0
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@@ -60,8 +61,19 @@ read_bsd_pt(int fd, struct slice all, struct slice *sp, unsigned int ns) {
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return -1;
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l = (struct bsd_disklabel *) bp;
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- if (l->d_magic != BSD_DISKMAGIC)
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- return -1;
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+ if (l->d_magic != BSD_DISKMAGIC) {
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+ /*
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+ * BSD disklabels can also start 64 bytes offset from the
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+ * start of the first sector
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+ */
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+ bp = getblock(fd, offset);
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+ if (bp == NULL)
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+ return -1;
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+
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+ l = (struct bsd_disklabel *)(bp + 64);
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+ if (l->d_magic != BSD_DISKMAGIC)
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+ return -1;
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+ }
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max_partitions = 16;
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if (l->d_npartitions < max_partitions)
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--
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2.17.2
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