[Bug tools/28488] phdr: unknown object file note type 32 with owner name '' at offset 48
mark at klomp dot org
Fri Oct 22 14:19:04 GMT 2021
--- Comment #9 from Mark Wielaard <mark at klomp dot org> ---
So the real difference is that with the Fedora the .note.gnu.property has
alignment 4 and so it gets merged with the other (allocated) note sections. But
the opensuse version .note.gnu.property has alignment 8 and ends up in its own
phdr NOTE segment.
I don't know whether this is buggy or if eu-elflint just gets confused about
Creating NOTEs with an alignment of 8 was controversial since at least on GNU
systems all other NOTEs have alignment 4 whether or not using ELFCLASS32 or
Handling of gnu property notes was added with:
Author: Mark Wielaard <email@example.com>
Date: Mon Oct 15 23:35:47 2018 +0200
Recognize and parse GNU Property notes.
GNU Property notes are different from normal notes because they use
variable alignment/padding of their fields. They are 8 byte aligned,
but use 4 byte fields. The name is aligned at 4 bytes and padded so
that, the desc is aligned at 8 bytes. The whole note is padded to
8 bytes again. For normal notes all fields are both 4 bytes wide and
4 bytes aligned.
To recognize these new kind of ELF Notes a new Elf_Type is introduced,
ELF_T_NHDR8. This type is used in the xlate functions to determine
how to align and pad the various fields. Since the fields themselves
can now have different alignments we will have to keep track of the
current alignement and use either NOTE_ALIGN4 or NOTE_ALIGN8 to
determine the padding.
To set the correct Elf_Type on the Elf_Data we use either the section
sh_addralign or the segment p_align values. Assuming 8 means the
section or segment contains the new style notes, otherwise normal
When we cannot determine the "alignment" directly, like when parsing
special kernel sys files, we check the name "GNU" and type
ebl_object_note now parses the new NT_GNU_PROPERTY_TYPE_0 and can
extract the GNU_PROPERTY_STACK_SIZE, GNU_PROPERTY_NO_COPY_ON_PROTECTED
and GNU_PROPERTY_X86_FEATURE_1_AND types GNU_PROPERTY_X86_FEATURE_1_IBT
Tests are added for extracting the note from sections or segments
as set by gcc -fcf-protection.
Signed-off-by: Mark Wielaard <firstname.lastname@example.org>
Another maybe (or maybe not) related bug:
"unknown program header entry type 0x6474e553 (PT_GNU_PROPERTY)"
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