The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
4dbd6a3e90e0 ("x86/ioremap: Fix page aligned size calculation in __ioremap_caller()") ecdd6ee77b73 ("x86/mm/pat: Standardize on memtype_*() prefix for APIs") f9b57cf80c8b ("x86/mm/pat: Move the memtype related files to arch/x86/mm/pat/") baf65855baac ("x86/mm/pat: Harmonize 'struct memtype *' local variable and function parameter use") ef35b0fcee23 ("x86/mm/pat: Create fixed width output in /sys/kernel/debug/x86/pat_memtype_list, similar to the E820 debug printouts") aee7f91369a8 ("x86/mm/pat: Update the comments in pat.c and pat_interval.c and refresh the code a bit") 91298f1a302d ("x86/mm/pat: Fix off-by-one bugs in interval tree search") 1c134b198daa ("Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 4dbd6a3e90e03130973688fd79e19425f720d999 Mon Sep 17 00:00:00 2001 From: Michael Kelley mikelley@microsoft.com Date: Wed, 16 Nov 2022 10:41:24 -0800 Subject: [PATCH] x86/ioremap: Fix page aligned size calculation in __ioremap_caller()
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 mikelley@microsoft.com Signed-off-by: Borislav Petkov bp@suse.de Acked-by: Dave Hansen dave.hansen@linux.intel.com Cc: stable@kernel.org Link: https://lore.kernel.org/r/1668624097-14884-2-git-send-email-mikelley@microso...
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 78c5bc654cff..6453fbaedb08 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -217,9 +217,15 @@ __ioremap_caller(resource_size_t phys_addr, unsigned long size, * 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) {