Don't adjust LOAD segment to match GNU_RELRO segment
Instead, fix Jakub's original code setting up the PR_GNU_RELRO header from the PT_LOAD header. PR ld/14207 PR ld/16322 PR binutils/16323 bfd/ * elf.c (assign_file_positions_for_load_sections): Revert last change. (assign_file_positions_for_non_load_sections): When setting up PT_GNU_RELRO header, don't require a corresponding PT_LOAD header that completely covers the relro region. ld/ * ldlang.c (lang_size_sections): Remove unneeded RELRO base adjust. Tidy comments. * ld.texinfo (DATA_SEGMENT_RELRO_END): Correct description. ld/testsuite/ * ld-x86-64/pr14207.d: Adjust
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7 changed files with 37 additions and 52 deletions
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@ -1,3 +1,13 @@
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2014-01-10 Alan Modra <amodra@gmail.com>
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PR ld/14207
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PR ld/16322
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PR binutils/16323
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* elf.c (assign_file_positions_for_load_sections): Revert last change.
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(assign_file_positions_for_non_load_sections): When setting up
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PT_GNU_RELRO header, don't require a corresponding PT_LOAD
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header that completely covers the relro region.
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2014-01-09 Tristan Gingold <gingold@adacore.com>
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* coff-rs6000.c (rs6000coff_vec, pmac_xcoff_vec): use jump
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37
bfd/elf.c
37
bfd/elf.c
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@ -4376,7 +4376,6 @@ assign_file_positions_for_load_sections (bfd *abfd,
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unsigned int alloc;
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unsigned int i, j;
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bfd_vma header_pad = 0;
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bfd_vma relro_start = 0, relro_end = 0;
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if (link_info == NULL
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&& !_bfd_elf_map_sections_to_segments (abfd, link_info))
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@ -4447,23 +4446,6 @@ assign_file_positions_for_load_sections (bfd *abfd,
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header_pad -= off;
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off += header_pad;
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/* Get start and end of PT_GNU_RELRO segment. */
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if (link_info != NULL)
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{
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relro_start = link_info->relro_start;
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relro_end = link_info->relro_end;
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}
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else
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{
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for (m = elf_seg_map (abfd); m != NULL; m = m->next)
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if (m->p_type == PT_GNU_RELRO)
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{
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relro_start = m->p_paddr;
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relro_end = relro_start + m->p_size;
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break;
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}
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}
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for (m = elf_seg_map (abfd), p = phdrs, j = 0;
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m != NULL;
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m = m->next, p++, j++)
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@ -4807,22 +4789,6 @@ assign_file_positions_for_load_sections (bfd *abfd,
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}
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}
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if (relro_start != 0
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&& p->p_type == PT_LOAD
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&& p->p_vaddr >= relro_start)
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{
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/* If PT_LOAD segment doesn't fit PT_GNU_RELRO segment,
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adjust its p_filesz and p_memsz. */
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if (p->p_vaddr + p->p_filesz < relro_end)
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{
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bfd_vma adjust = relro_end - (p->p_vaddr + p->p_filesz);
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p->p_filesz += adjust;
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off += adjust;
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}
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if (p->p_vaddr + p->p_memsz < relro_end)
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p->p_memsz += relro_end - (p->p_vaddr + p->p_memsz);
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}
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off -= off_adjust;
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/* Check that all sections are in a PT_LOAD segment.
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@ -5024,14 +4990,11 @@ assign_file_positions_for_non_load_sections (bfd *abfd,
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{
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if (lp->p_type == PT_LOAD
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&& lp->p_vaddr < link_info->relro_end
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&& lp->p_vaddr + lp->p_filesz >= link_info->relro_end
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&& lm->count != 0
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&& lm->sections[0]->vma >= link_info->relro_start)
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break;
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}
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/* PR ld/14207. If the RELRO segment doesn't fit in the
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LOAD segment, it should be removed. */
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BFD_ASSERT (lm != NULL);
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}
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else
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@ -1,3 +1,12 @@
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2014-01-10 Alan Modra <amodra@gmail.com>
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PR ld/14207
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PR ld/16322
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PR binutils/16323
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* ldlang.c (lang_size_sections): Remove unneeded RELRO base
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adjust. Tidy comments.
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* ld.texinfo (DATA_SEGMENT_RELRO_END): Correct description.
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2014-01-10 Hans-Peter Nilsson <hp@axis.com>
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* emulparams/crislinux.sh (COMMONPAGESIZE): Define.
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@ -5916,13 +5916,15 @@ evaluation purposes.
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@item DATA_SEGMENT_RELRO_END(@var{offset}, @var{exp})
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@kindex DATA_SEGMENT_RELRO_END(@var{offset}, @var{exp})
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This defines the end of the @code{PT_GNU_RELRO} segment when
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@samp{-z relro} option is used. Second argument is returned.
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@samp{-z relro} option is used.
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When @samp{-z relro} option is not present, @code{DATA_SEGMENT_RELRO_END}
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does nothing, otherwise @code{DATA_SEGMENT_ALIGN} is padded so that
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@var{exp} + @var{offset} is aligned to the most commonly used page
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boundary for particular target. If present in the linker script,
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it must always come in between @code{DATA_SEGMENT_ALIGN} and
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@code{DATA_SEGMENT_END}.
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@code{DATA_SEGMENT_END}. Evaluates to the second argument plus any
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padding needed at the end of the @code{PT_GNU_RELRO} segment due to
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section alignment.
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@smallexample
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. = DATA_SEGMENT_RELRO_END(24, .);
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21
ld/ldlang.c
21
ld/ldlang.c
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@ -5362,18 +5362,14 @@ lang_size_sections (bfd_boolean *relax, bfd_boolean check_regions)
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&& link_info.relro && expld.dataseg.relro_end)
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{
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/* If DATA_SEGMENT_ALIGN DATA_SEGMENT_RELRO_END pair was seen, try
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to put expld.dataseg.relro on a (common) page boundary. */
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bfd_vma min_base, old_base, relro_end, maxpage;
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to put expld.dataseg.relro_end on a (common) page boundary. */
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bfd_vma min_base, relro_end, maxpage;
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expld.dataseg.phase = exp_dataseg_relro_adjust;
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maxpage = expld.dataseg.maxpagesize;
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/* MIN_BASE is the absolute minimum address we are allowed to start the
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read-write segment (byte before will be mapped read-only). */
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min_base = (expld.dataseg.min_base + maxpage - 1) & ~(maxpage - 1);
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/* OLD_BASE is the address for a feasible minimum address which will
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still not cause a data overlap inside MAXPAGE causing file offset skip
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by MAXPAGE. */
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old_base = expld.dataseg.base;
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expld.dataseg.base += (-expld.dataseg.relro_end
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& (expld.dataseg.pagesize - 1));
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/* Compute the expected PT_GNU_RELRO segment end. */
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@ -5389,9 +5385,9 @@ lang_size_sections (bfd_boolean *relax, bfd_boolean check_regions)
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if (expld.dataseg.relro_end > relro_end)
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{
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/* The alignment of sections between DATA_SEGMENT_ALIGN
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and DATA_SEGMENT_RELRO_END caused huge padding to be
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inserted at DATA_SEGMENT_RELRO_END. Try to start a bit lower so
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that the section alignments will fit in. */
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and DATA_SEGMENT_RELRO_END can cause excessive padding to
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be inserted at DATA_SEGMENT_RELRO_END. Try to start a
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bit lower so that the section alignments will fit in. */
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asection *sec;
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unsigned int max_alignment_power = 0;
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if (((bfd_vma) 1 << max_alignment_power) < expld.dataseg.pagesize)
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{
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if (expld.dataseg.base - (1 << max_alignment_power) < old_base)
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expld.dataseg.base += expld.dataseg.pagesize;
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/* Properly align base to max_alignment_power. */
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/* Aligning the adjusted base guarantees the padding
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between sections won't change. This is better than
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simply subtracting 1 << max_alignment_power which is
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what we used to do here. */
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expld.dataseg.base &= ~((1 << max_alignment_power) - 1);
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lang_reset_memory_regions ();
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one_lang_size_sections_pass (relax, check_regions);
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@ -1,3 +1,7 @@
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2014-01-10 Alan Modra <amodra@gmail.com>
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* ld-x86-64/pr14207.d: Adjust.
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2014-01-09 H.J. Lu <hongjiu.lu@intel.com>
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* ld-elf/binutils.exp (binutils_test): Check if GNU_RELRO segment
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@ -11,7 +11,7 @@ There are 4 program headers, starting at offset 64
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Program Headers:
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Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
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LOAD 0x000000 0x0000000000000000 0x0000000000000000 0x0001e0 0x0001e0 R 0x200000
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LOAD 0x000b48 0x0000000000200b48 0x0000000000200b48 0x0004b8 0x000cf8 RW 0x200000
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LOAD 0x000b48 0x0000000000200b48 0x0000000000200b48 0x0004b0 0x000cf8 RW 0x200000
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DYNAMIC 0x000b90 0x0000000000200b90 0x0000000000200b90 0x0001c0 0x0001c0 RW 0x8
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GNU_RELRO 0x000b48 0x0000000000200b48 0x0000000000200b48 0x0004b8 0x0004b8 R 0x1
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