From: Peter Zijlstra <peterz@infradead.org>
To: Kees Cook <kees@kernel.org>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
alyssa.milburn@intel.com, scott.d.constable@intel.com,
joao@overdrivepizza.com, andrew.cooper3@citrix.com,
jpoimboe@kernel.org, jose.marchesi@oracle.com,
hjl.tools@gmail.com, ndesaulniers@google.com,
samitolvanen@google.com, nathan@kernel.org, ojeda@kernel.org,
alexei.starovoitov@gmail.com, mhiramat@kernel.org, jmill@asu.edu
Subject: Re: [PATCH v4 08/10] x86: BHI stubs
Date: Tue, 25 Feb 2025 09:52:12 +0100 [thread overview]
Message-ID: <20250225085212.GG11590@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <202502241100.9B62173958@keescook>
On Mon, Feb 24, 2025 at 11:01:02AM -0800, Kees Cook wrote:
> On Mon, Feb 24, 2025 at 01:37:11PM +0100, Peter Zijlstra wrote:
> >
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
>
> Did this commit log go missing?
Nah, it never had one.
How does this sound?
---
Add an array of code thunks, to be called from the FineIBT preamble,
clobbering the first 'n' argument registers for speculative execution.
Notably the 0th entry will clobber no argument registers and will never
be used, it exists so the array can be naturally indexed, while the 7th
entry will clobber all the 6 argument registers and also RSP in order to
mess up stack based arguments.
next prev parent reply other threads:[~2025-02-25 8:52 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-24 12:37 [PATCH v4 00/10] x86/ibt: FineIBT-BHI Peter Zijlstra
2025-02-24 12:37 ` [PATCH v4 01/10] x86/cfi: Add warn option Peter Zijlstra
2025-02-24 18:57 ` Kees Cook
2025-02-26 10:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2025-02-26 12:04 ` [tip: x86/core] x86/cfi: Add 'cfi=warn' boot option tip-bot2 for Peter Zijlstra
2025-02-24 12:37 ` [PATCH v4 02/10] x86/ibt: Add exact_endbr() helper Peter Zijlstra
2025-02-26 10:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2025-02-26 12:04 ` tip-bot2 for Peter Zijlstra
2025-02-24 12:37 ` [PATCH v4 03/10] x86/traps: Decode 0xEA #UD Peter Zijlstra
2025-02-24 18:58 ` Kees Cook
2025-02-26 10:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2025-02-26 12:04 ` [tip: x86/core] x86/traps: Decode 0xEA instructions as #UD tip-bot2 for Peter Zijlstra
2025-02-24 12:37 ` [PATCH v4 04/10] x86/traps: Allow custom fixups in handle_bug() Peter Zijlstra
2025-02-24 18:59 ` Kees Cook
2025-02-25 8:54 ` Peter Zijlstra
2025-02-26 10:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2025-02-26 12:04 ` tip-bot2 for Peter Zijlstra
2025-02-24 12:37 ` [PATCH v4 05/10] x86/ibt: Optimize FineIBT sequence Peter Zijlstra
2025-02-26 10:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2025-02-26 12:04 ` [tip: x86/core] x86/ibt: Optimize the FineIBT instruction sequence tip-bot2 for Peter Zijlstra
2025-02-24 12:37 ` [PATCH v4 06/10] x86/traps: Decode LOCK Jcc.d8 #UD Peter Zijlstra
2025-02-24 21:46 ` David Laight
2025-02-25 18:33 ` Kees Cook
2025-02-26 10:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2025-02-26 12:04 ` [tip: x86/core] x86/traps: Decode LOCK Jcc.d8 as #UD tip-bot2 for Peter Zijlstra
2025-02-24 12:37 ` [PATCH v4 07/10] x86/ibt: Add paranoid FineIBT mode Peter Zijlstra
2025-02-24 19:00 ` Kees Cook
2025-02-26 10:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2025-02-26 12:04 ` tip-bot2 for Peter Zijlstra
2025-02-24 12:37 ` [PATCH v4 08/10] x86: BHI stubs Peter Zijlstra
2025-02-24 19:01 ` Kees Cook
2025-02-25 8:52 ` Peter Zijlstra [this message]
2025-02-25 18:31 ` Kees Cook
2025-02-26 10:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2025-02-26 12:04 ` [tip: x86/core] x86/bhi: Add " tip-bot2 for Peter Zijlstra
2025-02-26 12:54 ` tip-bot2 for Peter Zijlstra
2025-02-24 12:37 ` [PATCH v4 09/10] x86/ibt: Implement FineIBT-BHI mitigation Peter Zijlstra
2025-02-25 9:12 ` Peter Zijlstra
2025-02-26 0:04 ` Constable, Scott D
2025-02-26 10:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2025-02-26 12:04 ` tip-bot2 for Peter Zijlstra
2025-02-26 12:54 ` tip-bot2 for Peter Zijlstra
2025-02-26 19:53 ` Peter Zijlstra
2025-03-10 8:55 ` Peter Zijlstra
2025-03-10 16:00 ` Miguel Ojeda
2025-03-10 16:02 ` Peter Zijlstra
2025-03-11 19:09 ` Ramon de C Valle
2025-03-11 19:41 ` Miguel Ojeda
2025-03-11 20:23 ` Ramon de C Valle
2025-03-12 9:16 ` Peter Zijlstra
2025-03-12 11:36 ` Miguel Ojeda
2025-03-19 0:04 ` Nathan Chancellor
2025-02-24 12:37 ` [PATCH v4 10/10] x86/ibt: Optimize fineibt-bhi arity 1 case Peter Zijlstra
2025-02-26 10:54 ` [tip: x86/core] " tip-bot2 for Peter Zijlstra
2025-02-26 12:04 ` [tip: x86/core] x86/ibt: Optimize the " tip-bot2 for Peter Zijlstra
2025-02-26 12:54 ` tip-bot2 for Peter Zijlstra
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