[comitted, PATCH] Add SHF_COMPRESSED support to readelf

[Doug Evans]

On Sun, Apr 5, 2015 at 9:31 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
> I checked in this patch to update readelf to dump compression header with
>
> readelf -S -W:
>
>   [ 4] .debug_info PROGBITS  00000000 000038 00007d 00   C 0   0  1
>
> readelf -t -W:
>
>   [ 4] .debug_info
>        PROGBITS        00000000 000038 00007d 00   0   0  1
>        [00000800]: COMPRESSED
>        ZLIB, 0000009d, 1
>
> It also checks the compression header when decompressing the compressed
> section.
>
>         * readelf.c (get_elf_section_flags): Support SHF_COMPRESSED.
>         (get_compression_header): New.
>         (process_section_headers): Dump compression header if needed.
>         (uncompress_section_contents): Don't free compressed_buffer here.
>         (load_specific_debug_section): Free the compressed buffer, update
>         the section buffer and the section size if uncompress is
>         successful.

Hi.

fyi, I filed https://sourceware.org/bugzilla/show_bug.cgi?id=18218

You probably fixed the original bug I was seeing (mishandling of sec->sh_size,
though I'm not positive),
but I'm now seeing a new bug: fetch_indexed_string is being called
with compressed contents for .[z]debug_str_offsets.dwo.