* Borislav Petkov <bp@xxxxxxxxx> wrote:
> On Fri, Aug 25, 2023 at 10:19:32AM -0000, tip-bot2 for Josh Poimboeuf wrote:
> > The following commit has been merged into the x86/bugs branch of tip:
> >
> > Commit-ID: b3be1397be0340b2c30b2dcd7339dbfaa5563e2b
> > Gitweb: https://git.kernel.org/tip/b3be1397be0340b2c30b2dcd7339dbfaa5563e2b
> > Author: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
> > AuthorDate: Fri, 25 Aug 2023 00:01:41 -07:00
> > Committer: Ingo Molnar <mingo@xxxxxxxxxx>
> > CommitterDate: Fri, 25 Aug 2023 11:21:59 +02:00
> >
> > x86/srso: Fix vulnerability reporting for missing microcode
> >
> > The SRSO default safe-ret mitigation is reported as "mitigated" even if
> > microcode hasn't been updated. That's wrong because userspace may still
> > be vulnerable to SRSO attacks due to IBPB not flushing branch type
> > predictions.
> >
> > Report the safe-ret + !microcode case as vulnerable.
> >
> > Also report the microcode-only case as vulnerable as it leaves the
> > kernel open to attacks.
> >
> > Fixes: fb3bd914b3ec ("x86/srso: Add a Speculative RAS Overflow mitigation")
> > Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
> > Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
> > Link: https://lore.kernel.org/r/65556eeb1bf7cb9bd7db8662ef115dd73191db84.1692919072.git.jpoimboe@xxxxxxxxxx
> > ---
> > Documentation/admin-guide/hw-vuln/srso.rst | 22 ++++++++++----
> > arch/x86/kernel/cpu/bugs.c | 34 ++++++++++++---------
> > 2 files changed, 37 insertions(+), 19 deletions(-)
>
> This is still unfixed:
>
> https://lore.kernel.org/r/20230825072542.GFZOhXdgXpUidW51lC@fat_crate.local
>
> mingo, do you want fixes ontop or do you wanna rebase this branch?
Since these are fixes that are supposed to be fully correct,
I'd suggest we rebase it.
Josh, mind sending a v3 SRSO series, as a replacement for x86/bugs,
with Boris's review & testing feedback addressed?
[ Feel free to send it as a delta series against v2 in x86/bugs and I'll
backmerge it all. ]
Thanks,
Ingo
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