* John Reiser: > 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.
That only seems to need shallow interposition, though. In most cases, I doubt you are interested in API calls from the library self because those are probably unproblematic. Thanks, Florian _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org 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@lists.fedoraproject.org
