The patch titled
Subject: vfio/type1: untag user pointers in vaddr_get_pfn
has been added to the -mm tree. Its filename is
vfio-type1-untag-user-pointers-in-vaddr_get_pfn.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/vfio-type1-untag-user-pointers-in-vaddr_get_pfn.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/vfio-type1-untag-user-pointers-in-vaddr_get_pfn.patch
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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: vfio/type1: untag user pointers in vaddr_get_pfn
This patch is a part of a series that extends kernel ABI to allow to pass
tagged user pointers (with the top byte set to something else other than
0x00) as syscall arguments.
vaddr_get_pfn() uses provided user pointers for vma lookups, which can
only by done with untagged pointers.
Untag user pointers in this function.
Link: http://lkml.kernel.org/r/87422b4d72116a975896f2b19b00f38acbd28f33.1563904656.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Cc: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
Cc: Khalid Aziz <khalid.aziz@xxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/vfio/vfio_iommu_type1.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/vfio/vfio_iommu_type1.c~vfio-type1-untag-user-pointers-in-vaddr_get_pfn
+++ a/drivers/vfio/vfio_iommu_type1.c
@@ -368,6 +368,8 @@ static int vaddr_get_pfn(struct mm_struc
down_read(&mm->mmap_sem);
+ vaddr = untagged_addr(vaddr);
+
vma = find_vma_intersection(mm, vaddr, vaddr + 1);
if (vma && vma->vm_flags & VM_PFNMAP) {
_
Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are
lib-untag-user-pointers-in-strn_user.patch
mm-untag-user-pointers-passed-to-memory-syscalls.patch
mm-untag-user-pointers-in-mm-gupc.patch
mm-untag-user-pointers-in-get_vaddr_frames.patch
fs-namespace-untag-user-pointers-in-copy_mount_options.patch
userfaultfd-untag-user-pointers.patch
drm-amdgpu-untag-user-pointers.patch
drm-radeon-untag-user-pointers-in-radeon_gem_userptr_ioctl.patch
media-v4l2-core-untag-user-pointers-in-videobuf_dma_contig_user_get.patch
tee-shm-untag-user-pointers-in-tee_shm_register.patch
vfio-type1-untag-user-pointers-in-vaddr_get_pfn.patch
