Messages in this thread Patch in this message | | | Date | Tue, 23 Jul 2019 19:58:47 +0200 | Subject | [PATCH v19 10/15] drm/radeon: untag user pointers in radeon_gem_userptr_ioctl | From | Andrey Konovalov <> |
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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().
Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com> Reviewed-by: Kees Cook <keescook@chromium.org> Suggested-by: Felix Kuehling <Felix.Kuehling@amd.com> Acked-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- drivers/gpu/drm/radeon/radeon_gem.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c index d8bc5d2dfd61..89353098b627 100644 --- a/drivers/gpu/drm/radeon/radeon_gem.c +++ b/drivers/gpu/drm/radeon/radeon_gem.c @@ -296,6 +296,8 @@ int radeon_gem_userptr_ioctl(struct drm_device *dev, void *data, uint32_t handle; int r; + args->addr = untagged_addr(args->addr); + if (offset_in_page(args->addr | args->size)) return -EINVAL; -- 2.22.0.709.g102302147b-goog
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