674888 - elfhack fails with "Moving section would require overlapping segments" when there is PT_INTERP info

Status: RESOLVED FIXED

(Firefox Build System :: General, defect)

Description

[Mike Hommey [:glandium]]

When building with a custom NDK with gcc 4.6 and binutils 2.21.53 gold, shared libraries end up with a PT_INTERP segment and the corresponding .interp section. That section follows the ELF headers, and the ElfSection::isRelocatable() function for that section doesn't return true. As the ELF headers need to be grown for elfhack to operate, failing to move .interp means elfhack can't do its job.

Unfortunately, there is no specifig flag or section type to identify .interp sections.

Comment 1

[Mike Hommey [:glandium]]

Attachment: Allow elfhack to move .interp sections

Comment 2

[(dormant account)]

Comment on attachment 550064 [details] [diff] [review]
Allow elfhack to move .interp sections

r+, but this kind of feature should be testcased

Comment 3

[Mike Hommey [:glandium]]

(In reply to comment #2)
> Comment on attachment 550064 [details] [diff] [review] [diff] [details] [review]
> Allow elfhack to move .interp sections
> 
> r+, but this kind of feature should be testcased

Actually, it's already testcased, in that the existing test is failing when the linker was creating the PT_INTERP segment. The only problem is that the testcase is not done when cross-compiling, and that's bug 675898.

Comment 4

[Mike Hommey [:glandium]]

(I do agree, however, that we need a real test suite tracking these linker specific issues, but doing so requires generating lib files, not linking them)

Comment 5

[Mike Hommey [:glandium]]

http://hg.mozilla.org/users/mh_glandium.org/elfhack/rev/814dd30c6adb
http://hg.mozilla.org/integration/mozilla-inbound/rev/5772d30e6894

Comment 6

[Mike Hommey [:glandium]]

Filed bug 676198 for the test suite.

Comment 7

[Marco Bonardo [:mak] (Away Apr 25 - May 5)]

http://hg.mozilla.org/mozilla-central/rev/5772d30e6894