From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3F89144DB69 for ; Tue, 16 Jun 2026 15:41:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781624471; cv=none; b=ncHtHVbLWGjfNk413IU62mAFli4O0dUyzuqpXyfTu9Kcdla3ro721K2EHtxZiZZRFsm6cVGK0x9NIKQnfHdrCbadkInQq/sMtzslLJrndz/wxXnGGhAHxisxq3aBMM14G7dKXRZtjQgbmthz2oBVrb/CcsFoT3SgCQtgmIXBIys= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781624471; c=relaxed/simple; bh=DMLTt1ATC1bROptnRx/9eM7fwyiyzBQBk8Xuhqje0fw=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=qYAVJmR1oW5rkCNxJfKeO8DSE0N+apdLi+lb8pSRs8iMf5WxNEN32GC7rDUVrYDtb8UZjBLIFFqVhC6m6dE1c5QV9AIKm7b3zbHjHq+mOMKXL2IDExD93zllRDcaBjhI7e2hM7r/G7ldFgsL41/XUoEzM4dWfNGehtMfZ72wJbk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=b+dMyBHR; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="b+dMyBHR" 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 Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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