diff options
Diffstat (limited to 'ld/ldlang.c')
| -rw-r--r-- | ld/ldlang.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/ld/ldlang.c b/ld/ldlang.c index e991646..8d95254 100644 --- a/ld/ldlang.c +++ b/ld/ldlang.c @@ -5056,17 +5056,23 @@ lang_size_sections (bfd_boolean *relax, bfd_boolean check_regions) { /* If DATA_SEGMENT_ALIGN DATA_SEGMENT_RELRO_END pair was seen, try to put expld.dataseg.relro on a (common) page boundary. */ - bfd_vma old_min_base, relro_end, maxpage; + bfd_vma min_base, old_base, relro_end, maxpage; expld.dataseg.phase = exp_dataseg_relro_adjust; - old_min_base = expld.dataseg.min_base; maxpage = expld.dataseg.maxpagesize; + /* MIN_BASE is the absolute minimum address we are allowed to start the + read-write segment (byte before will be mapped read-only). */ + min_base = (expld.dataseg.min_base + maxpage - 1) & ~(maxpage - 1); + /* OLD_BASE is the address for a feasible minimum address which will + still not cause a data overlap inside MAXPAGE causing file offset skip + by MAXPAGE. */ + old_base = expld.dataseg.base; expld.dataseg.base += (-expld.dataseg.relro_end & (expld.dataseg.pagesize - 1)); /* Compute the expected PT_GNU_RELRO segment end. */ relro_end = ((expld.dataseg.relro_end + expld.dataseg.pagesize - 1) & ~(expld.dataseg.pagesize - 1)); - if (old_min_base + maxpage < expld.dataseg.base) + if (min_base + maxpage < expld.dataseg.base) { expld.dataseg.base -= maxpage; relro_end -= maxpage; @@ -5077,7 +5083,8 @@ lang_size_sections (bfd_boolean *relax, bfd_boolean check_regions) { /* The alignment of sections between DATA_SEGMENT_ALIGN and DATA_SEGMENT_RELRO_END caused huge padding to be - inserted at DATA_SEGMENT_RELRO_END. Try some other base. */ + inserted at DATA_SEGMENT_RELRO_END. Try to start a bit lower so + that the section alignments will fit in. */ asection *sec; unsigned int max_alignment_power = 0; @@ -5091,8 +5098,7 @@ lang_size_sections (bfd_boolean *relax, bfd_boolean check_regions) if (((bfd_vma) 1 << max_alignment_power) < expld.dataseg.pagesize) { - if (expld.dataseg.base - (1 << max_alignment_power) - < old_min_base) + if (expld.dataseg.base - (1 << max_alignment_power) < old_base) expld.dataseg.base += expld.dataseg.pagesize; expld.dataseg.base -= (1 << max_alignment_power); lang_reset_memory_regions (); |