linux-kernel - [PATCH v2 01/12] x86/ioremap: Fix page aligned size calculation in __ioremap

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Date:   Thu, 10 Nov 2022 22:21:30 -0800
From:   Michael Kelley <mikelley@...rosoft.com>
To:     hpa@...or.com, kys@...rosoft.com, haiyangz@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, luto@...nel.org,
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        linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
        iommu@...ts.linux.dev
Cc:     mikelley@...rosoft.com
Subject: [PATCH v2 01/12] x86/ioremap: Fix page aligned size calculation in __ioremap_caller()

If applying the PHYSICAL_PAGE_MASK to the phys_addr argument causes
upper bits to be masked out, the re-calculation of size to account for
page alignment is incorrect because the same bits are not masked out
in last_addr.

Fix this by masking the page aligned last_addr as well.

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 arch/x86/mm/ioremap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 78c5bc6..0343de4 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -218,7 +218,7 @@ static void __ioremap_check_mem(resource_size_t addr, unsigned long size,
 	 */
 	offset = phys_addr & ~PAGE_MASK;
 	phys_addr &= PHYSICAL_PAGE_MASK;
-	size = PAGE_ALIGN(last_addr+1) - phys_addr;
+	size = (PAGE_ALIGN(last_addr+1) & PHYSICAL_PAGE_MASK) - phys_addr;
 
 	retval = memtype_reserve(phys_addr, (u64)phys_addr + size,
 						pcm, &new_pcm);
-- 
1.8.3.1