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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-11-24 06:41:40 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-11-24 06:41:52 -0800 |
| commit | 650444eb540f9fd85e821567a3f943b4bc41b8be (patch) | |
| tree | 2c5e0bf7934a74df34cfd3a0c9377d62903717bb /binutils | |
| parent | a63f2d2feedcfce401ae1d7d03d119bfa5e4d8bc (diff) | |
| download | gdb-650444eb540f9fd85e821567a3f943b4bc41b8be.zip gdb-650444eb540f9fd85e821567a3f943b4bc41b8be.tar.gz gdb-650444eb540f9fd85e821567a3f943b4bc41b8be.tar.bz2 | |
elf: Properly compute offsets of note descriptor and next note
According to gABI, in a note entry, the note name field, not note name
size, is padded for the note descriptor. And the note descriptor field,
not note descriptor size, is padded for the next note entry. Also notes
are aligned to 4 bytes in 32-bit objects and 8 bytes in 64-bit objects.
Since on Linux, .note.ABI-tag and .note.gnu.build-id notes are always
aligned to 4 bytes, we need to use alignment of note section or note
segment, instead of assuming alignment based on ELF file class.
Tested on i686 and x86-64.
bfd/
PR binutils/22444
* elf.c (elf_read_notes): Add an argument for note aligment.
(elf_parse_notes): Likewise.
(_bfd_elf_make_section_from_shdr): Pass section aligment to
elf_parse_notes.
(bfd_section_from_phdr): Pass segment aligment to elf_read_notes.
(elf_parse_notes): Add an argument for note aligment. Use
ELF_NOTE_DESC_OFFSET to get the offset of the note descriptor.
Use ELF_NOTE_NEXT_OFFSET to get the offset of the next note
entry.
(elf_read_notes): Add an argument for note aligment and pass it
to elf_parse_notes.
binutils/
PR binutils/22444
* readelf.c (process_notes_at): Use ELF_NOTE_DESC_OFFSET to get
the offset of the note descriptor. Use ELF_NOTE_NEXT_OFFSET to
get the offset of the next note entry.
include/
PR binutils/22444
* elf/external.h (ELF_ALIGN_UP): New.
(ELF_NOTE_DESC_OFFSET): Likewise.
(ELF_NOTE_NEXT_OFFSET): Likewise.
Diffstat (limited to 'binutils')
| -rw-r--r-- | binutils/ChangeLog | 7 | ||||
| -rw-r--r-- | binutils/readelf.c | 8 |
2 files changed, 13 insertions, 2 deletions
diff --git a/binutils/ChangeLog b/binutils/ChangeLog index 32df4b9..eab6830 100644 --- a/binutils/ChangeLog +++ b/binutils/ChangeLog @@ -1,3 +1,10 @@ +2017-11-24 H.J. Lu <hongjiu.lu@intel.com> + + PR binutils/22444 + * readelf.c (process_notes_at): Use ELF_NOTE_DESC_OFFSET to get + the offset of the note descriptor. Use ELF_NOTE_NEXT_OFFSET to + get the offset of the next note entry. + 2017-11-23 Pavel I. Kryukov <kryukov@frtk.ru> PR 22485 diff --git a/binutils/readelf.c b/binutils/readelf.c index 5944ebe..739367d 100644 --- a/binutils/readelf.c +++ b/binutils/readelf.c @@ -17969,9 +17969,13 @@ process_notes_at (Filedata * filedata, inote.namesz = BYTE_GET (external->namesz); inote.namedata = external->name; inote.descsz = BYTE_GET (external->descsz); - inote.descdata = inote.namedata + align_power (inote.namesz, 2); + inote.descdata = ((char *) external + + ELF_NOTE_DESC_OFFSET (inote.namesz, + section->sh_addralign)); inote.descpos = offset + (inote.descdata - (char *) pnotes); - next = inote.descdata + align_power (inote.descsz, 2); + next = ((char *) external + + ELF_NOTE_NEXT_OFFSET (inote.namesz, inote.descsz, + section->sh_addralign)); } else { |