Re: [tip: x86/bugs] x86/retpoline: Ensure default return thunk isn't used at runtime
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- Subject: Re: [tip: x86/bugs] x86/retpoline: Ensure default return thunk isn't used at runtime
- From: Borislav Petkov <bp@xxxxxxxxx>
- Date: Wed, 18 Oct 2023 17:12:45 +0200
- Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx, David Kaplan <david.kaplan@xxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>, x86@xxxxxxxxxx
- In-reply-to: <ZS/f8DeEIWhBtBeb@gmail.com>
- References: <20231012141031.GHZSf+V1NjjUJTc9a9@fat_crate.local> <169713303534.3135.10558074245117750218.tip-bot2@tip-bot2> <20231018132352.GBZS/caGJ8Wk9kmTbg@fat_crate.local> <ZS/f8DeEIWhBtBeb@gmail.com>
On Wed, Oct 18, 2023 at 03:38:56PM +0200, Ingo Molnar wrote:
> If then WARN_ONCE().
WARN_ONCE() is not enough considering that if this fires, it means we're
not really properly protected against one of those RET-speculation
things.
It needs to be warning constantly but then still allow booting. I.e,
a ratelimited warn of sorts but I don't think we have that... yet.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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