85 lines
3.3 KiB
Diff
85 lines
3.3 KiB
Diff
From 956608c1344f185e39294004b64906a7e1b5c14c Mon Sep 17 00:00:00 2001
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From: Frediano Ziglio <freddy77@gmail.com>
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Date: Sat, 19 Sep 2020 15:13:42 +0100
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Subject: [PATCH vd_agent_linux 10/17] Avoids unchecked file transfer IDs
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allocation and usage
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Avoid agents allocating file transfers.
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The "active_xfers" entries are now inserted when client start sending
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files.
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Also different agents cannot mess with other agent transfers as a
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transfer is bound to a single agent.
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This issue was reported by SUSE security team.
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Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
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Acked-by: Uri Lublin <uril@redhat.com>
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---
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src/vdagentd/vdagentd.c | 28 ++++++++++++++++++++++------
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1 file changed, 22 insertions(+), 6 deletions(-)
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diff --git a/src/vdagentd/vdagentd.c b/src/vdagentd/vdagentd.c
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index eddfcf6..8961a99 100644
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--- a/src/vdagentd/vdagentd.c
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+++ b/src/vdagentd/vdagentd.c
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@@ -381,9 +381,11 @@ static void do_client_file_xfer(VirtioPort *vport,
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s->id, VD_AGENT_FILE_XFER_STATUS_SESSION_LOCKED, NULL, 0);
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return;
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}
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- udscs_write(active_session_conn, VDAGENTD_FILE_XFER_START, 0, 0,
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- data, message_header->size);
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- return;
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+ msg_type = VDAGENTD_FILE_XFER_START;
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+ id = s->id;
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+ // associate the id with the active connection
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+ g_hash_table_insert(active_xfers, GUINT_TO_POINTER(id), active_session_conn);
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+ break;
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}
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case VD_AGENT_FILE_XFER_STATUS: {
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VDAgentFileXferStatusMessage *s = (VDAgentFileXferStatusMessage *)data;
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@@ -408,6 +410,12 @@ static void do_client_file_xfer(VirtioPort *vport,
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return;
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}
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udscs_write(conn, msg_type, 0, 0, data, message_header->size);
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+
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+ // client told that transfer is ended, agents too stop the transfer
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+ // and release resources
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+ if (message_header->type == VD_AGENT_FILE_XFER_STATUS) {
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+ g_hash_table_remove(active_xfers, GUINT_TO_POINTER(id));
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+ }
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}
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static void forward_data_to_session_agent(uint32_t type, uint8_t *data, size_t size)
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@@ -1015,6 +1023,15 @@ static void do_agent_file_xfer_status(UdscsConnection *conn,
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const gchar *log_msg = NULL;
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guint data_size = 0;
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+ UdscsConnection *task_conn = g_hash_table_lookup(active_xfers, task_id);
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+ if (task_conn == NULL || task_conn != conn) {
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+ // Protect against misbehaving agent.
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+ // Ignore the message, but do not disconnect the agent, to protect against
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+ // a misbehaving client that tries to disconnect a good agent
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+ // e.g. by sending a new task and immediately cancelling it.
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+ return;
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+ }
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+
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/* header->arg1 = file xfer task id, header->arg2 = file xfer status */
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switch (header->arg2) {
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case VD_AGENT_FILE_XFER_STATUS_NOT_ENOUGH_SPACE:
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@@ -1029,10 +1046,9 @@ static void do_agent_file_xfer_status(UdscsConnection *conn,
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send_file_xfer_status(virtio_port, log_msg, header->arg1, header->arg2,
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data, data_size);
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- if (header->arg2 == VD_AGENT_FILE_XFER_STATUS_CAN_SEND_DATA)
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- g_hash_table_insert(active_xfers, task_id, conn);
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- else
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+ if (header->arg2 != VD_AGENT_FILE_XFER_STATUS_CAN_SEND_DATA) {
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g_hash_table_remove(active_xfers, task_id);
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+ }
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}
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static void agent_read_complete(UdscsConnection *conn,
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--
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2.26.2
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