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| author | Alan Modra <amodra@gmail.com> | 2018-12-28 09:41:44 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2018-12-28 15:02:08 +1030 |
| commit | 0e41bebb938dbe9eae7063f5321429194bfc5ab7 (patch) | |
| tree | b29f3fb4479bd29ebb404d81e1d0e4f7d1f2fd75 /bfd | |
| parent | cb87d9f1a49986b2eb92ac381444f4cc7c9d8a4f (diff) | |
| download | gdb-0e41bebb938dbe9eae7063f5321429194bfc5ab7.zip gdb-0e41bebb938dbe9eae7063f5321429194bfc5ab7.tar.gz gdb-0e41bebb938dbe9eae7063f5321429194bfc5ab7.tar.bz2 | |
PR24015, glibc-2.28 on little-endian mips32 broken
Commit 2bf2bf23da exposed a bug on targets that create common sections
other than the standard ELF SHN_COMMON. If these are output by ld -r,
then their type becomes SHT_PROGBITS unless the target handles them
specially (eg. by elf_backend_special_sections), and if they are
merged into .bss/.sbss by ld -r then that section becomes SHT_PROGBITS.
Worse, if they are output by ld -r, then their size is increased by
bfd_generic_define_common_symbol during final link, which leads to
bogus file contents being copied to output.
For mips, it seems to me that the .scommon section should not be
output for ld -r, but I haven't made that change in this patch.
PR 24015
* elf.c (bfd_elf_get_default_section_type): Make common sections
SHT_NOBITS.
* linker.c (bfd_generic_define_common_symbol): Clear
SEC_HAS_CONTENTS.
Diffstat (limited to 'bfd')
| -rw-r--r-- | bfd/ChangeLog | 8 | ||||
| -rw-r--r-- | bfd/elf.c | 2 | ||||
| -rw-r--r-- | bfd/linker.c | 2 |
3 files changed, 10 insertions, 2 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 8a073f6..1396c70 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,5 +1,13 @@ 2018-12-28 Alan Modra <amodra@gmail.com> + PR 24015 + * elf.c (bfd_elf_get_default_section_type): Make common sections + SHT_NOBITS. + * linker.c (bfd_generic_define_common_symbol): Clear + SEC_HAS_CONTENTS. + +2018-12-28 Alan Modra <amodra@gmail.com> + PR 23966 * libbfd.c (SSIZE_MAX): Define. (bfd_malloc, bfd_realloc): Don't cast size to long to check for @@ -3127,7 +3127,7 @@ _bfd_elf_init_reloc_shdr (bfd *abfd, int bfd_elf_get_default_section_type (flagword flags) { - if ((flags & SEC_ALLOC) != 0 + if ((flags & (SEC_ALLOC | SEC_IS_COMMON)) != 0 && (flags & (SEC_LOAD | SEC_HAS_CONTENTS)) == 0) return SHT_NOBITS; return SHT_PROGBITS; diff --git a/bfd/linker.c b/bfd/linker.c index 9fee90d..fff9d9b 100644 --- a/bfd/linker.c +++ b/bfd/linker.c @@ -3119,7 +3119,7 @@ bfd_generic_define_common_symbol (bfd *output_bfd, /* Make sure the section is allocated in memory, and make sure that it is no longer a common section. */ section->flags |= SEC_ALLOC; - section->flags &= ~SEC_IS_COMMON; + section->flags &= ~(SEC_IS_COMMON | SEC_HAS_CONTENTS); return TRUE; } |