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From 96798fc1967491c80a4d0c8d9e0a80586cb2152b Mon Sep 17 00:00:00 2001
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From: Alan Coopersmith <alan.coopersmith@oracle.com>
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Date: Fri, 22 Mar 2024 18:51:45 -0700
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Subject: [PATCH 1/4] Xi: ProcXIGetSelectedEvents needs to use unswapped length
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to send reply
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CVE-2024-31080
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Reported-by: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=69762
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Fixes: 53e821ab4 ("Xi: add request processing for XIGetSelectedEvents.")
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Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
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Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1463>
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---
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Xi/xiselectev.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/Xi/xiselectev.c b/Xi/xiselectev.c
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index edcb8a0d3..ac1494987 100644
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--- a/Xi/xiselectev.c
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+++ b/Xi/xiselectev.c
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@@ -349,6 +349,7 @@ ProcXIGetSelectedEvents(ClientPtr client)
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InputClientsPtr others = NULL;
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xXIEventMask *evmask = NULL;
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DeviceIntPtr dev;
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+ uint32_t length;
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REQUEST(xXIGetSelectedEventsReq);
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REQUEST_SIZE_MATCH(xXIGetSelectedEventsReq);
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@@ -418,10 +419,12 @@ ProcXIGetSelectedEvents(ClientPtr client)
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}
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}
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+ /* save the value before SRepXIGetSelectedEvents swaps it */
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+ length = reply.length;
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WriteReplyToClient(client, sizeof(xXIGetSelectedEventsReply), &reply);
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if (reply.num_masks)
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- WriteToClient(client, reply.length * 4, buffer);
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+ WriteToClient(client, length * 4, buffer);
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free(buffer);
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return Success;
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--
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2.44.0
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