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From 2c2d9c48d2daf0d78d20494c3779c0f6dc4bfa75 Mon Sep 17 00:00:00 2001
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From: Nigel Croxon <ncroxon@redhat.com>
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Date: Tue, 24 Sep 2019 11:39:24 -0400
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Subject: [RHEL7.8 PATCH V2 37/47] mdadm: force a uuid swap on big endian
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The code path for metadata 0.90 calls a common routine
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fname_from_uuid that uses metadata 1.2. The code expects member
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swapuuid to be setup and usable. But it is only setup when using
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metadata 1.2. Since the metadata 0.90 did not create swapuuid
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and set it. The test (st->ss == &super1) ? 1 : st->ss->swapuuid
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fails. The swapuuid is set at compile time based on byte order.
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Any call based on metadata 0.90 and on big endian processors,
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the --export uuid will be incorrect.
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Signed-Off-by: Nigel Croxon <ncroxon@redhat.com>
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Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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---
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util.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/util.c b/util.c
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index c26cf5f..64dd409 100644
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--- a/util.c
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+++ b/util.c
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@@ -685,8 +685,12 @@ char *fname_from_uuid(struct supertype *st, struct mdinfo *info,
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// work, but can't have it set if we want this printout to match
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// all the other uuid printouts in super1.c, so we force swapuuid
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// to 1 to make our printout match the rest of super1
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+#if __BYTE_ORDER == BIG_ENDIAN
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+ return __fname_from_uuid(info->uuid, 1, buf, sep);
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+#else
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return __fname_from_uuid(info->uuid, (st->ss == &super1) ? 1 :
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st->ss->swapuuid, buf, sep);
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+#endif
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}
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int check_ext2(int fd, char *name)
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--
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2.7.5
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