From: Michael Kelley mikelley@microsoft.com
[ Upstream commit 4dbd6a3e90e03130973688fd79e19425f720d999 ]
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... Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/mm/ioremap.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index adc77904fc3e..7da9b427044c 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -171,9 +171,15 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr, * 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 = reserve_memtype(phys_addr, (u64)phys_addr + size, pcm, &new_pcm); if (retval) {