Commit 7e9081c5 authored by Gustavo Padovan's avatar Gustavo Padovan

drm/fence: fix memory overwrite when setting out_fence fd

Currently if the userspace declares a int variable to store the out_fence
fd and pass it to OUT_FENCE_PTR the kernel will overwrite the 32 bits
above the int variable on 64 bits systems.

Fix this by making the internal storage of out_fence in the kernel a s32
pointer.
Reported-by: default avatarChad Versace <chadversary@chromium.org>
Signed-off-by: default avatarGustavo Padovan <gustavo.padovan@collabora.com>
Fixes: beaf5af4 ("drm/fence: add out-fences support")
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Rafael Antognolli <rafael.antognolli@intel.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-and-Tested-by: default avatarChad Versace <chadversary@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1484317329-9293-1-git-send-email-gustavo@padovan.org
parent 3846fd9b
......@@ -291,15 +291,15 @@ drm_atomic_get_crtc_state(struct drm_atomic_state *state,
EXPORT_SYMBOL(drm_atomic_get_crtc_state);
static void set_out_fence_for_crtc(struct drm_atomic_state *state,
struct drm_crtc *crtc, s64 __user *fence_ptr)
struct drm_crtc *crtc, s32 __user *fence_ptr)
{
state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = fence_ptr;
}
static s64 __user *get_out_fence_for_crtc(struct drm_atomic_state *state,
static s32 __user *get_out_fence_for_crtc(struct drm_atomic_state *state,
struct drm_crtc *crtc)
{
s64 __user *fence_ptr;
s32 __user *fence_ptr;
fence_ptr = state->crtcs[drm_crtc_index(crtc)].out_fence_ptr;
state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = NULL;
......@@ -512,7 +512,7 @@ int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
state->color_mgmt_changed |= replaced;
return ret;
} else if (property == config->prop_out_fence_ptr) {
s64 __user *fence_ptr = u64_to_user_ptr(val);
s32 __user *fence_ptr = u64_to_user_ptr(val);
if (!fence_ptr)
return 0;
......@@ -1915,7 +1915,7 @@ EXPORT_SYMBOL(drm_atomic_clean_old_fb);
*/
struct drm_out_fence_state {
s64 __user *out_fence_ptr;
s32 __user *out_fence_ptr;
struct sync_file *sync_file;
int fd;
};
......@@ -1952,7 +1952,7 @@ static int prepare_crtc_signaling(struct drm_device *dev,
return 0;
for_each_crtc_in_state(state, crtc, crtc_state, i) {
u64 __user *fence_ptr;
s32 __user *fence_ptr;
fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
......
......@@ -144,7 +144,7 @@ struct __drm_crtcs_state {
struct drm_crtc *ptr;
struct drm_crtc_state *state;
struct drm_crtc_commit *commit;
s64 __user *out_fence_ptr;
s32 __user *out_fence_ptr;
};
struct __drm_connnectors_state {
......
......@@ -488,7 +488,7 @@ struct drm_mode_config {
/**
* @prop_out_fence_ptr: Sync File fd pointer representing the
* outgoing fences for a CRTC. Userspace should provide a pointer to a
* value of type s64, and then cast that pointer to u64.
* value of type s32, and then cast that pointer to u64.
*/
struct drm_property *prop_out_fence_ptr;
/**
......
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