From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 77377CD98E1 for ; Tue, 16 Jun 2026 15:41:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=4fXKQZ62YbUSWMyHmi4buCG/RQAWQXgAM+XKOF1miWg=; b=21InsvtcXgmRdZR+3DgyhgMWzN nR07gFy6uz15dcOLfxf6ci0WXUltBUn5v7qlRojAxDwv3hOJxeyBh4ZZgOd3+igg1jPFEH0TVDJ2D O94WBfu/DGAlGE3t86r20+0TL7uEqeMRNVxKUrc6O1KXm7wg2b0+f+AcCfhZaZCejXKkIJN1OtjRJ Y+3DjxrwYDjjRWD3IL31oSfGtO4EOZRiuT8Ilh3EpZYun/G5Sbx2YUvjMaJ/Zz9gt3hP02cUHfXVu 21wxWK3xAUWomf3lfhhvEeh6Cz6d54DvL6nfYyZokNBOLiznduWjX84Adi/voAr+mZWH6PmSaZx3J a/feHN0A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wZVua-0000000G1wg-43d5; Tue, 16 Jun 2026 15:41:13 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wZVuZ-0000000G1wE-1jyG for linux-arm-kernel@lists.infradead.org; Tue, 16 Jun 2026 15:41:11 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 6E19D60141; Tue, 16 Jun 2026 15:41:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4C1D11F00A3A; Tue, 16 Jun 2026 15:41:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781624470; bh=4fXKQZ62YbUSWMyHmi4buCG/RQAWQXgAM+XKOF1miWg=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=b+dMyBHR6oRMk34jYJ5+9hacn+vl4i1HjkIPv1VdV5hCcpOveE1k5rHWYZP61ieb8 lSPbvU43se8+w/uZKjFucWKa6QWOcFQHbUSv3osbRweZaZzBxF2KtyLss3gOf8WlkE x8s2dvTpbY0NpBBgVv8zOFzuccrAjYLHMy8cSIXCzRxfQbhx+YOhMA4EW9hccdMDQX yuRDK6VHPKv8P/D6uQKOuiccx2+s713o5GAmFuyPEKSWaxGBy7/oB0/u5raXeJ/KmX 1ccIijXynm3jy2p7h2cH+Az7bsSvtwfLAdcVeHiHKPfWaAVV+wzzmglsG+bLMhBf/B bxNI5Sn2wa+2Q== Message-ID: Date: Tue, 16 Jun 2026 17:41:02 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v8 02/24] set_memory: Introduce set_memory_pkey() stub To: Kevin Brodsky , linux-hardening@vger.kernel.org Cc: Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , Ira Weiny , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , Quentin Perret , Rick Edgecombe , Ryan Roberts , Vlastimil Babka , Will Deacon , Yang Shi , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org, Lorenzo Stoakes , Thomas Gleixner References: <20260526-kpkeys-v8-0-eaaacdacc67c@arm.com> <20260526-kpkeys-v8-2-eaaacdacc67c@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 5/26/26 13:15, Kevin Brodsky wrote: > Introduce a new function, set_memory_pkey(), which sets the > protection key (pkey) of pages in the specified linear mapping > range. Architectures implementing kernel pkeys (kpkeys) must > provide a suitable implementation; an empty stub is added as > fallback. > > Signed-off-by: Kevin Brodsky > --- > include/linux/set_memory.h | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h > index 3030d9245f5a..7b3a8bfde3c6 100644 > --- a/include/linux/set_memory.h > +++ b/include/linux/set_memory.h > @@ -84,4 +84,11 @@ static inline int set_memory_decrypted(unsigned long addr, int numpages) > } > #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ > > +#ifndef CONFIG_ARCH_HAS_KPKEYS > +static inline int set_memory_pkey(unsigned long addr, int numpages, int pkey) > +{ > + return 0; > +} > +#endif > + > #endif /* _LINUX_SET_MEMORY_H_ */ > This patch looks rather odd, given that this is just a stub that won't be used before patch #20. And there, it's only used from arm64 code? So why do we need the common-code stub? -- Cheers, David