On 26/07/18 22:34 +0200, Florian Weimer wrote:
http://www.erahm.org/2016/03/24/minimum-alignment-of-allocation-across-platforms/
Oh dear, this is worrying. I'm adding more places in libstdc++ where the std::lib assumes that memory obtained from malloc will always be aligned to alignof(max_align_t). If somebody replaces malloc and it fails to meet that requirement, undefined behaviour can happen (specifically, types that require 16-byte alignment might not get it when placed in containers like std::vector, leading to unaligned accesses). Replacement mallocs really need to meet malloc's guarantees, not just pick and choose what they care about. This is a very good reason why we should be cautious about allowing applications to replace malloc in Fedora. _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx/message/IQQY5ZC7VIXUF544JBTILERCTJMETFHC/
