On Tue, Oct 15, 2013 at 02:16:28PM -0400, Carlos O'Donell wrote: > There is no effective security difference between accessing the randomized > stack guard value from a global variable or a value stored in the dynamic > thread vector. > > It is only a performance optimization. The choice of a global variable vs. > DTV offset has only to do with the speed of access of the stack guard. DTV access is of course going to be expensive, after all, that is a function call, the question was about reserving a word at fixed constant offset from the TLS base and how expensive that is vs. global variable access. For soft FP I guess global variable access must win, for -mtp=cp15 ]it depends on how fast the mrc instruction is. Jakub -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
