From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1323879C0 for ; Wed, 30 Nov 2022 18:40:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 81F92C433C1; Wed, 30 Nov 2022 18:40:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669833625; bh=wrwmUT9CGF7VPCAMKuCM/INJr3l8x1wMFRTeW9wPXOQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=de0CFRgmXJD+DgYoaVlkkhSMnBM1vpqsE+2RjnBE1llmAxIHwylf+menTQM6ThZhY kZ7GW0Kvcnk+0vErFPwAASs976C/TIJM/77UQ4JRJviPZH0p/G8qCrybElJK9XqyIf x7N1jjA7nt687CZq8w87BePuomEKSjtNT5Xn30jM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Michael Kelley , Borislav Petkov , Dave Hansen , stable@kernel.org Subject: [PATCH 5.15 163/206] x86/ioremap: Fix page aligned size calculation in __ioremap_caller() Date: Wed, 30 Nov 2022 19:23:35 +0100 Message-Id: <20221130180537.178310022@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221130180532.974348590@linuxfoundation.org> References: <20221130180532.974348590@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Michael Kelley commit 4dbd6a3e90e03130973688fd79e19425f720d999 upstream. Current code re-calculates the size after aligning the starting and ending physical addresses on a page boundary. But the re-calculation also embeds the masking of high order bits that exceed the size of the physical address space (via PHYSICAL_PAGE_MASK). If the masking removes any high order bits, the size calculation results in a huge value that is likely to immediately fail. Fix this by re-calculating the page-aligned size first. Then mask any high order bits using PHYSICAL_PAGE_MASK. Fixes: ffa71f33a820 ("x86, ioremap: Fix incorrect physical address handling in PAE mode") Signed-off-by: Michael Kelley Signed-off-by: Borislav Petkov Acked-by: Dave Hansen Cc: Link: https://lore.kernel.org/r/1668624097-14884-2-git-send-email-mikelley@microsoft.com Signed-off-by: Greg Kroah-Hartman --- arch/x86/mm/ioremap.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -216,9 +216,15 @@ __ioremap_caller(resource_size_t phys_ad * Mappings have to be page-aligned */ offset = phys_addr & ~PAGE_MASK; - phys_addr &= PHYSICAL_PAGE_MASK; + phys_addr &= PAGE_MASK; size = PAGE_ALIGN(last_addr+1) - phys_addr; + /* + * Mask out any bits not part of the actual physical + * address, like memory encryption bits. + */ + phys_addr &= PHYSICAL_PAGE_MASK; + retval = memtype_reserve(phys_addr, (u64)phys_addr + size, pcm, &new_pcm); if (retval) {