On 29/10/2019 21:46, Dan Callaghan wrote:
I couldn't find anything that would ever use the bzip2 decompression in
elfutils, so I had a quick look at why they even added bzip2 support in
the first place. It turns out it was for reading compressed kernel
images (presumably, in the elfutils tools like eu-readelf):
https://sourceware.org/git/?p=elfutils.git;a=commitdiff;h=d6ccdc1a05f27bf0bb5d802ec14f879aa9fe3e98
commit d6ccdc1a05f27bf0bb5d802ec14f879aa9fe3e98
Author: Roland McGrath <[email protected]>
Date: Wed Aug 26 00:23:01 2009 -0700
libdwfl: Support Linux bzip2 kernel images for automatic decompression.
And indeed on my Fedora host eu-readelf can decode ELF information from
a kernel bzImage, but the eu-readelf built by Yocto's elfutils-native
recipe says "not a valid ELF file" when I feed it the same bzImage.
Whether that's useful or not is a different question. In our product
I am planning to disable bzip2 (because we don't use the elfutils tools
for anything) and enable xz (for .gnu_debugdata sections).
Good digging, thanks.
Lets default to bzip being off for now, and then if anyone does want
this then they can just turn it on.
Ross
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