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Alexander Orzechowski c4824b680a xdg-foreign: Fix crash on destroy of degenerate surface 
I am running a custom compiled version of chromium with a patch to get
it up and running on sway git at the moment, and in that development
build I compiled there is a bug where the browser will crash if you
try to open a file select dialog. When this crash happens, chromium will
not close, but instead will remain open and impossible to close unless
you send a SIGKILL signal to the process. However, sway will crash to
tty when you send the SIGKILL.

I have a hunch that when chromium is opening the file select dialog
it is creating some sort of a xdg toplevel surface. But it freezes
before it fully initializes the surface. When the SIGKILL signal is
given, sway/wlroots will try to free the xdg_toplevel surface but
because it hasn't fully initialized due to the frozen window, it
segfaults.

Don't be fooled by the assert, the assert is not firing, the surface
pointer is indeed NULL here.

* thread #1, name = 'sway', stop reason = signal SIGSEGV: invalid address (fault address: 0x28)
    frame #0: 0x00007ffff78b9041 libwlroots.so.11`wlr_xdg_toplevel_set_parent(surface=0x0000000000000000, parent=0x0000000000000000) at wlr_xdg_toplevel.c:159:37
   156
   157 	void wlr_xdg_toplevel_set_parent(struct wlr_xdg_surface *surface,
   158 			struct wlr_xdg_surface *parent) {
-> 159 		assert(surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
   160 		assert(!parent || parent->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
   161
   162 		if (surface->toplevel->parent) {
(lldb) up
error: sway {0x0003442a}: DIE has DW_AT_ranges(DW_FORM_sec_offset 0x67) attribute, but range extraction failed (invalid range list offset 0x67), please file a bug and attach the file at the start of this error message
error: sway {0x0003442a}: DIE has DW_AT_ranges(DW_FORM_sec_offset 0x67) attribute, but range extraction failed (invalid range list offset 0x67), please file a bug and attach the file at the start of this error message
frame #1: 0x00007ffff78e176e libwlroots.so.11`destroy_imported(imported=0x000055555626d570) at wlr_xdg_foreign_v1.c:154:3
   151 		wl_list_for_each_safe(child, child_tmp, &imported->children, link) {
   152 			struct wlr_xdg_surface *xdg_child =
   153 				wlr_xdg_surface_from_wlr_surface(child->surface);
-> 154 			wlr_xdg_toplevel_set_parent(xdg_child, NULL);
   155 		}
   156
   157 		wl_list_remove(&imported->exported_destroyed.link);
(lldb) up
frame #2: 0x00007ffff78e1b9d libwlroots.so.11`xdg_imported_handle_resource_destroy(resource=0x00005555562555a0) at wlr_xdg_foreign_v1.c:280:2
   277 			struct wl_resource *resource) {
   278 		struct wlr_xdg_imported_v1 *imported = xdg_imported_from_resource(resource);
   279 		if (!imported) {
-> 280 			return;
   281 		}
   282
   283 		destroy_imported(imported);
(lldb) up
frame #3: 0x00007ffff794989a libwayland-server.so.0`___lldb_unnamed_symbol211 + 154
libwayland-server.so.0`___lldb_unnamed_symbol211:
->  0x7ffff794989a <+154>: andl   $0x1, %r13d
    0x7ffff794989e <+158>: je     0x7ffff79498b0            ; <+176>
    0x7ffff79498a0 <+160>: addq   $0x8, %rsp
    0x7ffff79498a4 <+164>: movl   $0x1, %eax
(lldb) up
frame #4: 0x00007ffff794fec0 libwayland-server.so.0`___lldb_unnamed_symbol290 + 64
libwayland-server.so.0`___lldb_unnamed_symbol290:
->  0x7ffff794fec0 <+64>: cmpl   $0x1, %eax
    0x7ffff794fec3 <+67>: jne    0x7ffff794fed3            ; <+83>
    0x7ffff794fec5 <+69>: addq   $0x8, %rbx
    0x7ffff794fec9 <+73>: cmpq   %rbx, %r13
(lldb) up
frame #5: 0x00007ffff79503e0 libwayland-server.so.0`___lldb_unnamed_symbol300 + 32
libwayland-server.so.0`___lldb_unnamed_symbol300:
->  0x7ffff79503e0 <+32>: cmpl   $0x1, %eax
    0x7ffff79503e3 <+35>: je     0x7ffff79503f0            ; <+48>
    0x7ffff79503e5 <+37>: popq   %rbx
    0x7ffff79503e6 <+38>: popq   %r12
(lldb) up
frame #6: 0x00007ffff794a30e libwayland-server.so.0`wl_client_destroy + 126
libwayland-server.so.0`wl_client_destroy:
->  0x7ffff794a30e <+126>: movq   %r12, %rdi
    0x7ffff794a311 <+129>: callq  0x7ffff7950150            ; ___lldb_unnamed_symbol293
    0x7ffff794a317 <+135>: movq   0x8(%rbp), %rdi
    0x7ffff794a31b <+139>: callq  *0xdc77(%rip)
(lldb) up
frame #7: 0x00007ffff794a3f7 libwayland-server.so.0`___lldb_unnamed_symbol214 + 119
libwayland-server.so.0`___lldb_unnamed_symbol214:
->  0x7ffff794a3f7 <+119>: movq   0x28(%rsp), %rax
    0x7ffff794a3fc <+124>: subq   %fs:0x28, %rax
    0x7ffff794a405 <+133>: jne    0x7ffff794a727            ; <+935>
    0x7ffff794a40b <+139>: addq   $0x38, %rsp
(lldb) up
frame #8: 0x00007ffff794d1ca libwayland-server.so.0`wl_event_loop_dispatch + 202
libwayland-server.so.0`wl_event_loop_dispatch:
->  0x7ffff794d1ca <+202>: addq   $0xc, %r15
    0x7ffff794d1ce <+206>: cmpq   %r15, %rbp
    0x7ffff794d1d1 <+209>: jne    0x7ffff794d1b8            ; <+184>
    0x7ffff794d1d3 <+211>: movq   0x8(%rsp), %rcx
(lldb) up
frame #9: 0x00007ffff794ad37 libwayland-server.so.0`wl_display_run + 39
libwayland-server.so.0`wl_display_run:
->  0x7ffff794ad37 <+39>: movl   0x8(%rbx), %eax
    0x7ffff794ad3a <+42>: testl  %eax, %eax
    0x7ffff794ad3c <+44>: jne    0x7ffff794ad20            ; <+16>
    0x7ffff794ad3e <+46>: popq   %rbx
(lldb) up
frame #10: 0x000055555557689a sway`server_run(server=0x00005555555f26c0) at server.c:307:2
   304 			wlr_backend_destroy(server->backend);
   305 			return false;
   306 		}
-> 307
   308 		return true;
   309 	}
   310
(lldb) up
frame #11: 0x0000555555575a93 sway`main(argc=3, argv=0x00007fffffffe978) at main.c:431:2
   428 			swaynag_show(&config->swaynag_config_errors);
   429 		}
   430
-> 431 		server_run(&server);
   432
   433 	shutdown:
   434 		sway_log(SWAY_INFO, "Shutting down sway");

(cherry picked from commit cddc1c1bd9f796709c50f4bbb300788edd42fd4f)
 		2022-02-02 20:29:44 +01:00
.builds ci/archlinux: enable address and undefined sanitizers 2021-11-19 16:42:14 +00:00
backend backend: error out in autocreate without libinput support 2022-02-02 20:07:07 +01:00
docs backend: remove noop backend 2021-11-25 16:49:05 +00:00
examples examples: remove unnecessary partial_dependency() call 2021-12-07 16:20:54 +01:00
include scene: try to import buffers as textures before rendering 2022-02-02 20:28:27 +01:00
protocol linux-dmabuf-v1: implement v4 2021-12-07 15:18:16 +01:00
render render/gles2: don't constrain shm formats to ones that support reading 2022-02-02 20:08:17 +01:00
tinywl scene: fix wlr_scene_send_frame_done() API 2021-12-13 17:26:22 +01:00
types xdg-foreign: Fix crash on destroy of degenerate surface 2022-02-02 20:29:44 +01:00
util util/global: remove wl_display arg from wlr_global_destroy_safe 2021-12-14 13:13:50 +00:00
xcursor xcursor: fix CVE-2013-2003 2021-05-02 17:04:59 +02:00
xwayland xwayland: add support for -noTouchPointerEmulation 2021-11-02 12:02:51 +01:00
.editorconfig Set .editorconfig ident_size 2019-01-25 11:37:46 +01:00
.gitignore Remove rootston 2019-08-09 08:34:59 +09:00
.gitlab-ci.yml ci: add .gitlab-ci.yml 2021-11-01 16:51:18 +01:00
CONTRIBUTING.md CONTRIBUTING.md: add CoC section 2021-11-06 17:01:53 +03:00
LICENSE Update LICENSE year (MIT license) 2018-04-12 21:29:59 -04:00
README.md readme: update wrapper libraries link 2021-12-03 11:45:57 +01:00
meson.build backend/wayland: add basic linux-dmabuf feedback support 2021-12-15 14:34:08 +00:00
meson_options.txt render/vulkan: add Vulkan renderer 2021-10-18 11:51:13 +02:00
wlroots.syms build: simplify version script 2021-06-17 11:03:21 +02:00

README.md

wlroots

Pluggable, composable, unopinionated modules for building a Wayland compositor; or about 60,000 lines of code you were going to write anyway.

  • wlroots provides backends that abstract the underlying display and input hardware, including KMS/DRM, libinput, Wayland, X11, and headless backends, plus any custom backends you choose to write, which can all be created or destroyed at runtime and used in concert with each other.
  • wlroots provides unopinionated, mostly standalone implementations of many Wayland interfaces, both from wayland.xml and various protocol extensions. We also promote the standardization of portable extensions across many compositors.
  • wlroots provides several powerful, standalone, and optional tools that implement components common to many compositors, such as the arrangement of outputs in physical space.
  • wlroots provides an Xwayland abstraction that allows you to have excellent Xwayland support without worrying about writing your own X11 window manager on top of writing your compositor.
  • wlroots provides a renderer abstraction that simple compositors can use to avoid writing GL code directly, but which steps out of the way when your needs demand custom rendering code.

wlroots implements a huge variety of Wayland compositor features and implements them right, so you can focus on the features that make your compositor unique. By using wlroots, you get high performance, excellent hardware compatibility, broad support for many wayland interfaces, and comfortable development tools - or any subset of these features you like, because all of them work independently of one another and freely compose with anything you want to implement yourself.

Check out our wiki to get started with wlroots. Join our IRC channel: #sway-devel on Libera Chat.

wlroots is developed under the direction of the sway project. A variety of wrapper libraries are available for using it with your favorite programming language.

Building

Install dependencies:

  • meson
  • wayland
  • wayland-protocols
  • EGL and GLESv2 (optional, for the GLES2 renderer)
  • Vulkan loader, headers and glslang (optional, for the Vulkan renderer)
  • libdrm
  • GBM
  • libinput (optional, for the libinput backend)
  • xkbcommon
  • udev
  • pixman
  • libseat

If you choose to enable X11 support:

  • xwayland (build-time only, optional at runtime)
  • libxcb
  • libxcb-render-util
  • libxcb-wm
  • libxcb-errors (optional, for improved error reporting)

Run these commands:

meson build/
ninja -C build/

Install like so:

sudo ninja -C build/ install

Contributing

See CONTRIBUTING.md.