On Fri, Mar 5, 2021 at 12:23 AM Jian Cai <jian...@google.com> wrote: > On Wed, Mar 3, 2021 at 7:04 AM Linus Walleij <linus.wall...@linaro.org> wrote: > > > > On Tue, Feb 23, 2021 at 3:36 AM Jian Cai <jian...@google.com> wrote: > > > > > This patch adds CONFIG_HARDEN_SLS_ALL that can be used to turn on > > > -mharden-sls=all, which mitigates the straight-line speculation > > > vulnerability, speculative execution of the instruction following some > > > unconditional jumps. Notice -mharden-sls= has other options as below, > > > and this config turns on the strongest option. > > > > > > all: enable all mitigations against Straight Line Speculation that are > > > implemented. > > > none: disable all mitigations against Straight Line Speculation. > > > retbr: enable the mitigation against Straight Line Speculation for RET > > > and BR instructions. > > > blr: enable the mitigation against Straight Line Speculation for BLR > > > instructions. > > > > I heard about compiler protection for this, so nice to see it happening! > > > > Would you happen to know if there is any plan to do the same for GCC? > > I know you folks at Google like LLVM, but if you know let us know. > > I think gcc also has these options. > https://gcc.gnu.org/onlinedocs/gcc/AArch64-Options.html
And how does that work with this part of your patch: +#define SLS_TEXT \ + ALIGN_FUNCTION(); \ + *(.text.__llvm_slsblr_thunk_*) This does not look compiler agnostic? Yours, Linus Walleij
