error while loading shared libraries: dlopen: invalid caller

[pdoge]

hey
I tested this code and got this error.

error while loading shared libraries: dlopen: invalid caller

My environment：
centos7 64bit + ld-2.17.so + glibc-2.17-260.el7_6.6.x86_64 + kernel 3.10.0-957.27.2.el7.x86_64

I think this error comes from __check_caller in glibc

What should I do so that I can successfully test, or the experimental environment of the person who successfully tested. thinks

[DavidBuchanan314]

Until now, I've been leaving the caller_dlopen argument undefined. On newer libcs (since this patch: https://patchwork.ozlabs.org/project/glibc/patch/20180205140121.440E240137CD1@oldenburg.str.redhat.com/ ) , this doesn't matter. But yours apparently still has the check.

To work around this, we need to set caller_dlopen to a "correct" value. In this case, I think we can just use the address of the _dl_open function itself.

[DavidBuchanan314]

@pdoge I think I've fixed this in the latest commit, can you please re-test?

[pdoge]

@DavidBuchanan314 I just used your latest inject code for testing and the same error occurred

[pdoge]

I overwrite the _dl_check_caller function in ld-2.17.so by memory injection, so that dlopen: invalid caller no longer appears. Thank you for sharing the process memory injection ideas. I learned a lot

[DavidBuchanan314]

I am reopening this issue because at some point, I would like to create a workaround in the tool itself, that doesn't require patching libc etc.

[wxingda]

I got the same problem