diff options
Diffstat (limited to 'repo/system/efivar/patches/efivar-fix-format_guid.patch')
| -rw-r--r-- | repo/system/efivar/patches/efivar-fix-format_guid.patch | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/repo/system/efivar/patches/efivar-fix-format_guid.patch b/repo/system/efivar/patches/efivar-fix-format_guid.patch new file mode 100644 index 0000000..f40942f --- /dev/null +++ b/repo/system/efivar/patches/efivar-fix-format_guid.patch @@ -0,0 +1,56 @@ +From b98ba8921010d03f46704a476c69861515deb1ca Mon Sep 17 00:00:00 2001 +From: Peter Jones <pjones@redhat.com> +Date: Mon, 7 Jan 2019 10:30:59 -0500 +Subject: [PATCH] dp.h: make format_guid() handle misaligned guid pointers + safely. + +GCC 9 adds -Werror=address-of-packed-member, which causes us to see the +build error reported at + https://bugzilla.opensuse.org/show_bug.cgi?id=1120862 . + +That bug report shows us the following: + +In file included from dp.c:26: +dp.h: In function 'format_vendor_helper': +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] + 120 | format_guid(buf, size, off, label, &dp->hw_vendor.vendor_guid); + | ^~~~~~~~~~~~~~~~~~~~~~~~~~ +dp.h:74:25: note: in definition of macro 'format_guid' + 74 | _rc = efi_guid_to_str(guid, &_guidstr); \ + | ^~~~ +cc1: all warnings being treated as errors + +This patch makes format_guid() use a local variable as a bounce buffer +in the case that the guid we're passed is aligned as chaotic neutral. + +Note that this only fixes this instance and there may be others that bz +didn't show because it exited too soon, and I don't have a gcc 9 build +in front of me right now. + +Signed-off-by: Peter Jones <pjones@redhat.com> +--- + src/dp.h | 11 +++++++++-- + 1 file changed, 9 insertions(+), 2 deletions(-) + +diff --git a/src/dp.h b/src/dp.h +index aa4e390..20cb608 100644 +--- a/src/dp.h ++++ b/src/dp.h +@@ -70,8 +70,15 @@ + #define format_guid(buf, size, off, dp_type, guid) ({ \ + int _rc; \ + char *_guidstr = NULL; \ +- \ +- _rc = efi_guid_to_str(guid, &_guidstr); \ ++ efi_guid_t _guid; \ ++ const efi_guid_t * const _guid_p = \ ++ likely(__alignof__(guid) == sizeof(guid)) \ ++ ? guid \ ++ : &_guid; \ ++ \ ++ if (unlikely(__alignof__(guid) == sizeof(guid))) \ ++ memmove(&_guid, guid, sizeof(_guid)); \ ++ _rc = efi_guid_to_str(_guid_p, &_guidstr); \ + if (_rc < 0) { \ + efi_error("could not build %s GUID DP string", \ + dp_type); \ |