On 15.09.2015 15:58, Simo Sorce wrote: > On Tue, 2015-09-15 at 09:41 -0400, Carlos O'Donell wrote: >> On 09/14/2015 08:29 AM, Florian Weimer wrote: >>> I think the real issue here is the ELF model with backwards/forwards >>> linking and symbol interposition. Ideally, we should load each DSO >>> exactly once, resolve object symbols only against explicit DT_NEEDED >>> dependencies (not indirect dependencies), and make most symbols >>> non-interposable by default. At least this is my gut feeling. This is >>> a very difficult problem, especially at distribution scale. >> >> I'm not sure how difficult this would be because I'm not sure how many >> symbols rely upon indirect dependencies. I think it would be a worthwhile >> cleanup to turn on something like you suggest, and attempt to bootstrap >> the OS using Fedora Bootstrap [1]. > > Symbol interposition is used a lot for very useful features, blocking > interposition would break a lot of stuff. really? i've always thought that it was only useful for libc symbols, but maybe that's because i don't work on base OS stuff. by my naive count we have 341k exported symbols in LibreOffice, and of those, 4 of them used to be interposeable in a practically useful way (to override the custom memory allocator for valgrind), but even those are useless nowadays since the G_SLICE environment variable disables the custom allocator. -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
