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ELF: Group PT_NOTE segments by section alignments 

Alignments of SHT_NOTE sections can be 8 bytes for 64-bit ELF files.  We
should put all adjacent SHT_NOTE sections with the same section alignment
into a single PT_NOTE segment even when the section alignment != 4 bytes.
Also check SHT_NOTE section type instead of section name.

	PR ld/23658
	* elf.c (get_program_header_size): Put all adjacent SHT_NOTE
	sections with the same section alignment into a single PT_NOTE
	segment.  Check SHT_NOTE section type instead of section name.
	(_bfd_elf_map_sections_to_segments): Likewise.
This commit is contained in:
H.J. Lu 2018-10-03 13:22:26 -07:00
parent e66cfcef72
commit 23e463ed7c
2 changed files with 37 additions and 30 deletions
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8
bfd/ChangeLog
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@ -1,3 +1,11 @@
2018-10-03 H.J. Lu <hongjiu.lu@intel.com>
PR ld/23658
* elf.c (get_program_header_size): Put all adjacent SHT_NOTE
sections with the same section alignment into a single PT_NOTE
segment. Check SHT_NOTE section type instead of section name.
(_bfd_elf_map_sections_to_segments): Likewise.
2018-10-03 Millan Wolff <mail@milianw.de>
PR 23715

59
bfd/elf.c
View File

@ -4371,23 +4371,22 @@ get_program_header_size (bfd *abfd, struct bfd_link_info *info)
for (s = abfd->sections; s != NULL; s = s->next)
{
if ((s->flags & SEC_LOAD) != 0
&& CONST_STRNEQ (s->name, ".note"))
&& elf_section_type (s) == SHT_NOTE)
{
unsigned int alignment_power;
/* We need a PT_NOTE segment. */
++segs;
/* Try to create just one PT_NOTE segment
for all adjacent loadable .note* sections.
gABI requires that within a PT_NOTE segment
(and also inside of each SHT_NOTE section)
each note is padded to a multiple of 4 size,
so we check whether the sections are correctly
aligned. */
if (s->alignment_power == 2)
while (s->next != NULL
&& s->next->alignment_power == 2
&& (s->next->flags & SEC_LOAD) != 0
&& CONST_STRNEQ (s->next->name, ".note"))
s = s->next;
/* Try to create just one PT_NOTE segment for all adjacent
loadable SHT_NOTE sections. gABI requires that within a
PT_NOTE segment (and also inside of each SHT_NOTE section)
each note should have the same alignment. So we check
whether the sections are correctly aligned. */
alignment_power = s->alignment_power;
while (s->next != NULL
&& s->next->alignment_power == alignment_power
&& (s->next->flags & SEC_LOAD) != 0
&& elf_section_type (s->next) == SHT_NOTE)
s = s->next;
}
}
@ -4885,33 +4884,33 @@ _bfd_elf_map_sections_to_segments (bfd *abfd, struct bfd_link_info *info)
pm = &m->next;
}
/* For each batch of consecutive loadable .note sections,
/* For each batch of consecutive loadable SHT_NOTE sections,
add a PT_NOTE segment. We don't use bfd_get_section_by_name,
because if we link together nonloadable .note sections and
loadable .note sections, we will generate two .note sections
in the output file. FIXME: Using names for section types is
bogus anyhow. */
in the output file. */
for (s = abfd->sections; s != NULL; s = s->next)
{
if ((s->flags & SEC_LOAD) != 0
&& CONST_STRNEQ (s->name, ".note"))
&& elf_section_type (s) == SHT_NOTE)
{
asection *s2;
unsigned int alignment_power = s->alignment_power;
count = 1;
amt = sizeof (struct elf_segment_map);
if (s->alignment_power == 2)
for (s2 = s; s2->next != NULL; s2 = s2->next)
{
if (s2->next->alignment_power == 2
&& (s2->next->flags & SEC_LOAD) != 0
&& CONST_STRNEQ (s2->next->name, ".note")
&& align_power (s2->lma + s2->size, 2)
== s2->next->lma)
count++;
else
break;
}
for (s2 = s; s2->next != NULL; s2 = s2->next)
{
if (s2->next->alignment_power == alignment_power
&& (s2->next->flags & SEC_LOAD) != 0
&& elf_section_type (s2->next) == SHT_NOTE
&& align_power (s2->lma + s2->size,
alignment_power)
== s2->next->lma)
count++;
else
break;
}
amt += (count - 1) * sizeof (asection *);
m = (struct elf_segment_map *) bfd_zalloc (abfd, amt);
if (m == NULL)