On 11/08/2017 05:31 PM, Mark Hatle wrote:
So a couple of questions.
- What exactly breaks currently when you let debugedit rewrite the
debuginfo source paths?
Alexander has more info then I do here, but I believe running it against grub
modules breaks the modules.
Here's how you can reproduce the breakage:
1) download
https://drive.google.com/open?id=1yKav0llpfrLjuMZOCj6ZyfVWGbxZQzIA
(a binary module from a grub build)
2) run
objcopy --only-keep-debug ./ntldr.module ntldr.module.debug
to establish that objcopy is happy with the download
3) run
debugedit -l debug.source ./ntldr.module
4) run the same objcopy command again ---> kaboom
objcopy: ./ntldr.module: invalid relocation type 112
objcopy: ./ntldr.module(rel.debug_info): relocation 556 has invalid
symbol index 7497472
objcopy: ./ntldr.module: invalid relocation type 98
objcopy: ./ntldr.module(rel.debug_info): relocation 557 has invalid
symbol index 6648415
objcopy: ./ntldr.module: invalid relocation type 108
objcopy: ./ntldr.module(rel.debug_info): relocation 558 has invalid
symbol index 7495522
objcopy: ./ntldr.module: invalid relocation type 117
objcopy: ./ntldr.module(rel.debug_info): relocation 559 has invalid
symbol index 7499636
objcopy: ./ntldr.module: invalid relocation type 97
objcopy: ./ntldr.module(rel.debug_info): relocation 560 has invalid
symbol index 25697
objcopy: ./ntldr.module: invalid relocation type 111
.....
Segmentation fault (core dumped)
Like Mark said, this isn't really the main issue for us; we would want
to not have the binary file modified at all. Currently debugedit doesn't
seem to provide that (and that's totally fine - a replacement is not
difficult to find).
Alex
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