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xwayland/selection: destroy all selections on Xwayland restart

Browse source 
Previously, Xwayland could restart, and we'd get events for transfers
pointing to the previous (now freed) xwm instance. This led to
use-after-free segfaults.

Closes #2565.
This commit is contained in:
Tudor Brindus 2021-01-29 19:00:17 -05:00 committed by Simon Ser
parent 3417fc0cca
commit b6ba595862
3 changed files with 28 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
include/xwayland/selection.h
View file

@ -51,6 +51,9 @@ void xwm_selection_transfer_finish(struct wlr_xwm_selection_transfer *transfer);
bool xwm_selection_transfer_get_selection_property( bool xwm_selection_transfer_get_selection_property(
struct wlr_xwm_selection_transfer *transfer, bool delete); struct wlr_xwm_selection_transfer *transfer, bool delete);
void xwm_selection_transfer_destroy_outgoing(
struct wlr_xwm_selection_transfer *transfer);
xcb_atom_t xwm_mime_type_to_atom(struct wlr_xwm *xwm, char *mime_type); xcb_atom_t xwm_mime_type_to_atom(struct wlr_xwm *xwm, char *mime_type);
char *xwm_mime_type_from_atom(struct wlr_xwm *xwm, xcb_atom_t atom); char *xwm_mime_type_from_atom(struct wlr_xwm *xwm, xcb_atom_t atom);
struct wlr_xwm_selection *xwm_get_selection(struct wlr_xwm *xwm, struct wlr_xwm_selection *xwm_get_selection(struct wlr_xwm *xwm,

2
xwayland/selection/outgoing.c
View file

@ -66,7 +66,7 @@ static struct wlr_xwm_selection_transfer *xwm_selection_transfer_get_first(
return first; return first;
} }
static void xwm_selection_transfer_destroy_outgoing( void xwm_selection_transfer_destroy_outgoing(
struct wlr_xwm_selection_transfer *transfer) { struct wlr_xwm_selection_transfer *transfer) {
struct wlr_xwm_selection *selection = transfer->selection; struct wlr_xwm_selection *selection = transfer->selection;
bool was_first = transfer == xwm_selection_transfer_get_first(selection); bool was_first = transfer == xwm_selection_transfer_get_first(selection);

26
xwayland/selection/selection.c
View file

@ -249,25 +249,47 @@ void xwm_selection_finish(struct wlr_xwm *xwm) {
if (!xwm) { if (!xwm) {
return; return;
} }
struct wlr_xwm_selection *selections[] = {
&xwm->clipboard_selection,
&xwm->primary_selection,
&xwm->dnd_selection,
};
for (size_t i = 0; i < sizeof(selections)/sizeof(selections[0]); i++) {
struct wlr_xwm_selection *selection = selections[i];
struct wlr_xwm_selection_transfer *outgoing, *tmp;
wl_list_for_each_safe(outgoing, tmp, &selection->outgoing, outgoing_link) {
wlr_log(WLR_INFO, "destroyed pending transfer %ld/%p", i, outgoing);
xwm_selection_transfer_destroy_outgoing(outgoing);
}
xwm_selection_transfer_finish(&selection->incoming);
}
if (xwm->selection_window) { if (xwm->selection_window) {
xcb_destroy_window(xwm->xcb_conn, xwm->selection_window); xcb_destroy_window(xwm->xcb_conn, xwm->selection_window);
} }
if (xwm->dnd_window) { if (xwm->dnd_window) {
xcb_destroy_window(xwm->xcb_conn, xwm->dnd_window); xcb_destroy_window(xwm->xcb_conn, xwm->dnd_window);
} }
if (xwm->seat) { if (xwm->seat) {
if (xwm->seat->selection_source && if (xwm->seat->selection_source &&
data_source_is_xwayland( data_source_is_xwayland(xwm->seat->selection_source)) {
xwm->seat->selection_source)) {
wlr_seat_set_selection(xwm->seat, NULL, wlr_seat_set_selection(xwm->seat, NULL,
wl_display_next_serial(xwm->xwayland->wl_display)); wl_display_next_serial(xwm->xwayland->wl_display));
} }
if (xwm->seat->primary_selection_source && if (xwm->seat->primary_selection_source &&
primary_selection_source_is_xwayland( primary_selection_source_is_xwayland(
xwm->seat->primary_selection_source)) { xwm->seat->primary_selection_source)) {
wlr_seat_set_primary_selection(xwm->seat, NULL, wlr_seat_set_primary_selection(xwm->seat, NULL,
wl_display_next_serial(xwm->xwayland->wl_display)); wl_display_next_serial(xwm->xwayland->wl_display));
} }
wlr_xwayland_set_seat(xwm->xwayland, NULL); wlr_xwayland_set_seat(xwm->xwayland, NULL);
} }
} }