On 2019-11-15 at 14:51 UTC, David Malcolm wrote:
Thinking aloud: does anyone ever use symbol overriding for anything other than glibc?
Yes. It is particularly useful for "spear fishing" debugging of lower-level interfaces in large, complex multi-process applications. By some means you determine that [part of] the bug involves a bad parameter to a particular API, but a conditional breakpoint in gdb has too much overhead (if you can figure out at all how to invoke gdb in the cloud of processes.) So: LD_PRELOAD a .so which overrides the API and checks the parameter. If no problem then pass control to the original implementation via RTLD_NEXT. If bad, then raise an alarm, prepare a backtrace, pause or spin until rescued by manual attach of gdb, etc. _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
