diff options
Diffstat (limited to 'patches/source/xorg-server-xwayland/CVE-2022-46343.patch')
-rw-r--r-- | patches/source/xorg-server-xwayland/CVE-2022-46343.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/patches/source/xorg-server-xwayland/CVE-2022-46343.patch b/patches/source/xorg-server-xwayland/CVE-2022-46343.patch new file mode 100644 index 000000000..3f2d0259b --- /dev/null +++ b/patches/source/xorg-server-xwayland/CVE-2022-46343.patch @@ -0,0 +1,47 @@ +From 842ca3ccef100ce010d1d8f5f6d6cc1915055900 Mon Sep 17 00:00:00 2001 +From: Peter Hutterer <peter.hutterer@who-t.net> +Date: Tue, 29 Nov 2022 14:53:07 +1000 +Subject: [PATCH] Xext: free the screen saver resource when replacing it + +This fixes a use-after-free bug: + +When a client first calls ScreenSaverSetAttributes(), a struct +ScreenSaverAttrRec is allocated and added to the client's +resources. + +When the same client calls ScreenSaverSetAttributes() again, a new +struct ScreenSaverAttrRec is allocated, replacing the old struct. The +old struct was freed but not removed from the clients resources. + +Later, when the client is destroyed the resource system invokes +ScreenSaverFreeAttr and attempts to clean up the already freed struct. + +Fix this by letting the resource system free the old attrs instead. + +CVE-2022-46343, ZDI-CAN 19404 + +This vulnerability was discovered by: +Jan-Niklas Sohn working with Trend Micro Zero Day Initiative + +Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> +Acked-by: Olivier Fourdan <ofourdan@redhat.com> +--- + Xext/saver.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/Xext/saver.c b/Xext/saver.c +index f813ba08d..fd6153c31 100644 +--- a/Xext/saver.c ++++ b/Xext/saver.c +@@ -1051,7 +1051,7 @@ ScreenSaverSetAttributes(ClientPtr client) + pVlist++; + } + if (pPriv->attr) +- FreeScreenAttr(pPriv->attr); ++ FreeResource(pPriv->attr->resource, AttrType); + pPriv->attr = pAttr; + pAttr->resource = FakeClientID(client->index); + if (!AddResource(pAttr->resource, AttrType, (void *) pAttr)) +-- +GitLab + |