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From b98ba8921010d03f46704a476c69861515deb1ca Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Mon, 7 Jan 2019 10:30:59 -0500
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Subject: [PATCH 02/86] dp.h: make format_guid() handle misaligned guid
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pointers safely.
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GCC 9 adds -Werror=address-of-packed-member, which causes us to see the
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build error reported at
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https://bugzilla.opensuse.org/show_bug.cgi?id=1120862 .
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That bug report shows us the following:
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In file included from dp.c:26:
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dp.h: In function 'format_vendor_helper':
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dp.h:120:37: error: taking address of packed member of 'struct <anonymous>' may result in an unaligned pointer value [-Werror=address-of-packed-member]
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120 | format_guid(buf, size, off, label, &dp->hw_vendor.vendor_guid);
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| ^~~~~~~~~~~~~~~~~~~~~~~~~~
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dp.h:74:25: note: in definition of macro 'format_guid'
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74 | _rc = efi_guid_to_str(guid, &_guidstr); \
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| ^~~~
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cc1: all warnings being treated as errors
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This patch makes format_guid() use a local variable as a bounce buffer
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in the case that the guid we're passed is aligned as chaotic neutral.
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Note that this only fixes this instance and there may be others that bz
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didn't show because it exited too soon, and I don't have a gcc 9 build
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in front of me right now.
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Signed-off-by: Peter Jones <pjones@redhat.com>
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---
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src/dp.h | 11 +++++++++--
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1 file changed, 9 insertions(+), 2 deletions(-)
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diff --git a/src/dp.h b/src/dp.h
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index aa4e3902992..20cb608d05f 100644
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--- a/src/dp.h
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+++ b/src/dp.h
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@@ -70,8 +70,15 @@
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#define format_guid(buf, size, off, dp_type, guid) ({ \
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int _rc; \
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char *_guidstr = NULL; \
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- \
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- _rc = efi_guid_to_str(guid, &_guidstr); \
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+ efi_guid_t _guid; \
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+ const efi_guid_t * const _guid_p = \
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+ likely(__alignof__(guid) == sizeof(guid)) \
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+ ? guid \
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+ : &_guid; \
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+ \
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+ if (unlikely(__alignof__(guid) == sizeof(guid))) \
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+ memmove(&_guid, guid, sizeof(_guid)); \
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+ _rc = efi_guid_to_str(_guid_p, &_guidstr); \
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if (_rc < 0) { \
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efi_error("could not build %s GUID DP string", \
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dp_type); \
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--
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2.24.1
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