The patch titled
Subject: drm/radeon: untag user pointers in radeon_gem_userptr_ioctl
has been added to the -mm tree. Its filename is
drm-radeon-untag-user-pointers-in-radeon_gem_userptr_ioctl.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/drm-radeon-untag-user-pointers-in-radeon_gem_userptr_ioctl.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/drm-radeon-untag-user-pointers-in-radeon_gem_userptr_ioctl.patch
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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: drm/radeon: untag user pointers in radeon_gem_userptr_ioctl
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.
In radeon_gem_userptr_ioctl() an MMU notifier is set up with a (tagged)
userspace pointer. The untagged address should be used so that MMU
notifiers for the untagged address get correctly matched up with the right
BO. This funcation also calls radeon_ttm_tt_pin_userptr(), which uses
provided user pointers for vma lookups, which can only by done with
untagged pointers.
This patch untags user pointers in radeon_gem_userptr_ioctl().
Link: http://lkml.kernel.org/r/c856babeb67195b35603b8d5ba386a2819cec5ff.1563904656.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Reviewed-by: Khalid Aziz <khalid.aziz@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Suggested-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Acked-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Eric Auger <eric.auger@xxxxxxxxxx>
Cc: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon_gem.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/gpu/drm/radeon/radeon_gem.c~drm-radeon-untag-user-pointers-in-radeon_gem_userptr_ioctl
+++ a/drivers/gpu/drm/radeon/radeon_gem.c
@@ -296,6 +296,8 @@ int radeon_gem_userptr_ioctl(struct drm_
uint32_t handle;
int r;
+ args->addr = untagged_addr(args->addr);
+
if (offset_in_page(args->addr | args->size))
return -EINVAL;
_
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
