devel April 2018

devel@uclibc-ng.org

8 participants
12 discussions

tst-atomic
by Alexey Brodkin 04 Apr '18

04 Apr '18

Hi Waldemar, I see in commit e65912f8b2a6 ("rework most tests to work as standalone package") "tst-atomic" and "tst-atomic-long" were marked as disabled for all architectures as opposed to previously (in times of test-suite being a part of uClibc) disabled only for selected arches (IA64, MIPS and SPARC). The only guess I have it was done due to inability to refer not-exported "atomic.h". Is that correct? But anyways I'm looking at a possibility to revive those as they might be of use especially in case of emulation of atomics. Any thoughts on how that could be done? -Alexey

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compile uclibc with retpoline switch
by Ata, John (US) 02 Apr '18

02 Apr '18

Hi all, With Spectre variant 2 (CVE-2017-5715), gcc has been updated to avoid branch prediction problems via the retpoline patch. Specifically, by using either -mindirect-branch=thunk-inline or -mindirect-branch=thunk or -mindirect-branch-thunk-external, the compiler will convert indirect branches and function returns to call and return thunks thus avoiding speculative execution in those cases. Of course, there is a performance penalty depending on the exact argument used. Has anyone compiled uclibc with one of those switches? Take care, ---- John Ata, CISSP Senior Principal Software Engineer Electronics Systems STOP Operating System<http://www.baesystems.com/en-us/product/stop> Software Development T 703-563-8115 | F 703-668-4359 | john.ata(a)baesystems.com<mailto:john.ata@baesystems.com> http://www.baesystems.com/csp [cid:image001.png@01D138BC.8E54E330][cid:image003.png@01D138BC.8E54E330]<http://www.twitter.com/baesystemsinc>[cid:image004.png@01D138BC.8E54E330]<http://www.youtube.com/baesystemsinc>[cid:image006.png@01D138BC.8E54E330]<http://www.flickr.com/photos/baesystemsinc/>

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devel April 2018