On 5/23/19 8:05 AM, Shane Peelar wrote:
Hi Everyone @ the Yocto project,
I'm Shane Peelar, a PhD Candidate at the University of Windsor.
I'm writing to you about prelink-cross, as part of the Yocto project.
Specifically, I'm looking at using it with executables built using
`-fno-plt` under GCC.
I wasn't quite sure where to send this email to, so I figured I'd try
here. If there's a better place to send this, please let me know.
Right now, prelink-cross seems to fail an assertion in arch-x86_64.c,
line 421, when
using it with an executable built with `-fno-plt`:
...
assert (i < dso->ehdr.e_shnum)
...
This snippet seems to be looking for the ".plt" section and, since it
can't find it, the assertion fires. This makes sense because in
`-fno-plt` executables, the `.plt` section is missing entirely.
I'm not an expert on ELF stuff, although I am learning quickly. It
looks like
this code wants to write into GOT[1] the address of ".plt" + 0x16 --
since ".plt" doesn't
exist, does it make sense to just change this assert to an if statement
like so:
...
if (i < dso->ehdr.e_shnum)
{ ... }
...
and skip over that part? Or is this a real error condition for
prelink-cross and it really should not continue? The executable in
question is also non-PIE, if that makes a difference.
what shared libs is this linking to ? are they also built with -fno-plt ?
Thanks for your time,
Shane
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