4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Dan Williams <dan.j.willi...@intel.com> commit 87744ab3832b83ba71b931f86f9cfdb000d07da5 upstream vm_insert_mixed() unlike vm_insert_pfn_prot() and vmf_insert_pfn_pmd(), fails to check the pgprot_t it uses for the mapping against the one recorded in the memtype tracking tree. Add the missing call to track_pfn_insert() to preclude cases where incompatible aliased mappings are established for a given physical address range. [groeck: Backport to v4.4.y] Link: http://lkml.kernel.org/r/147328717909.35069.14256589123570653697.st...@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.willi...@intel.com> Cc: David Airlie <airl...@linux.ie> Cc: Matthew Wilcox <mawil...@microsoft.com> Cc: Ross Zwisler <ross.zwis...@linux.intel.com> Signed-off-by: Andrew Morton <a...@linux-foundation.org> Signed-off-by: Linus Torvalds <torva...@linux-foundation.org> Signed-off-by: Guenter Roeck <li...@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- mm/memory.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/mm/memory.c +++ b/mm/memory.c @@ -1654,10 +1654,14 @@ EXPORT_SYMBOL(vm_insert_pfn_prot); int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn) { + pgprot_t pgprot = vma->vm_page_prot; + BUG_ON(!(vma->vm_flags & VM_MIXEDMAP)); if (addr < vma->vm_start || addr >= vma->vm_end) return -EFAULT; + if (track_pfn_insert(vma, &pgprot, pfn)) + return -EINVAL; /* * If we don't have pte special, then we have to use the pfn_valid() @@ -1670,9 +1674,9 @@ int vm_insert_mixed(struct vm_area_struc struct page *page; page = pfn_to_page(pfn); - return insert_page(vma, addr, page, vma->vm_page_prot); + return insert_page(vma, addr, page, pgprot); } - return insert_pfn(vma, addr, pfn, vma->vm_page_prot); + return insert_pfn(vma, addr, pfn, pgprot); } EXPORT_SYMBOL(vm_insert_mixed);
