On Wed, Jul 23, 2025 at 01:47:58PM +0000, Zhivich, Michael wrote:

On 7/22/25, 12:56, "Greg Kroah-Hartman" gregkh@linuxfoundation.org wrote:

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On Tue, Jul 22, 2025 at 04:22:54PM +0200, Borislav Petkov wrote:

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On Tue, Jul 22, 2025 at 08:28:44AM -0400, Michael Zhivich wrote:

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For kernels compiled with CONFIG_INIT_STACK_NONE=y, the value of __reserved field in zen_patch_rev union on the stack may be garbage. If so, it will prevent correct microcode check when consulting p.ucode_rev, resulting in incorrect mitigation selection.

"This is a stable-only fix." so that the AI is happy. :-P

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Cc: stable@vger.kernel.org Signed-off-by: Michael Zhivich mzhivich@akamai.com

Acked-by: Borislav Petkov (AMD) bp@alien8.de

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Fixes: 7a0395f6607a5 ("x86/bugs: Add a Transient Scheduler Attacks mitigation")

That commit in Fixes: is the 6.12 stable one.

The 6.6 one is:

Fixes: 90293047df18 ("x86/bugs: Add a Transient Scheduler Attacks mitigation")

The 6.1 is:

Fixes: d12145e8454f ("x86/bugs: Add a Transient Scheduler Attacks mitigation")

The 5.15 one:

Fixes: f2b75f1368af ("x86/bugs: Add a Transient Scheduler Attacks mitigation")

and the 5.10 one is

Fixes: 78192f511f40 ("x86/bugs: Add a Transient Scheduler Attacks mitigation")

and since all stable kernels above have INIT_STACK_NONE, that same one-liner should be applied to all of them.

Greg, I'm thinking this one-liner should apply to all of the above with some fuzz. Can you simply add it to each stable version with a different Fixes: tag each?

Or do you prefer separate submissions?

Ideally, separate submissions, otherwise I have to do this all by hand :(

thanks

greg k-h

Apologies for the barrage of e-mails; I managed to mess up the subject line on a couple, so I’ve resent them with correct subject lines. There’s now a submission per stable branch with appropriate patch and fixes tags.

Ok, I think I got them all figured out, thanks!

greg k-h