On Wednesday, September 12, 2018, Joni Orponen <[email protected]> wrote:
> On Wed, Sep 12, 2018 at 8:48 PM Wes Turner <[email protected]> wrote: > >> Should C extensions that compile all add >> `-mindirect-branch=thunk -mindirect-branch-register` [1] to mitigate the >> risk of Spectre variant 2 (which does indeed affect user space applications >> as well as kernels)? >> > > Are those available on GCC <= 4.2.0 as per PEP 513? > AFAIU, only GCC 7.3 and 8 have the retpoline (indirect-branch=thunk) support enabled by the `-mindirect-branch=thunk -mindirect-branch-register` CFLAGS. >
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