62 lines
2.1 KiB
Diff
62 lines
2.1 KiB
Diff
From: David Herrmann <dh.herrmann@gmail.com>
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Date: Tue, 26 May 2015 10:01:37 +0200
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Subject: [PATCH] kdbus: make metadata on broadcasts reliable
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If we cannot collect metadata, this is a serious error. Don't try to
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continue sending a message, but immediately bail out and tell the receiver
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that we dropped it. Otherwise, the receiver cannot rely on metadata to be
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present and might assume it's a faked connection.
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Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
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Acked-by: Daniel Mack <daniel@zonque.org>
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---
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ipc/kdbus/bus.c | 28 ++++++++++++++--------------
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1 file changed, 14 insertions(+), 14 deletions(-)
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diff --git a/ipc/kdbus/bus.c b/ipc/kdbus/bus.c
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index 9a0ecbc9df2f..d5475961b896 100644
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--- a/ipc/kdbus/bus.c
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+++ b/ipc/kdbus/bus.c
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@@ -293,12 +293,12 @@ void kdbus_bus_broadcast(struct kdbus_bus *bus,
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if (!kdbus_conn_policy_talk(conn_dst, NULL, conn_src))
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continue;
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- /*
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- * Keep sending messages even if we cannot acquire the
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- * requested metadata. It's up to the receiver to drop
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- * messages that lack expected metadata.
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- */
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- kdbus_kmsg_collect_metadata(kmsg, conn_src, conn_dst);
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+ ret = kdbus_kmsg_collect_metadata(kmsg, conn_src,
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+ conn_dst);
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+ if (ret < 0) {
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+ kdbus_conn_lost_message(conn_dst);
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+ continue;
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+ }
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} else {
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/*
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* Check if there is a policy db that prevents the
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@@ -344,14 +344,14 @@ void kdbus_bus_eavesdrop(struct kdbus_bus *bus,
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down_read(&bus->conn_rwlock);
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list_for_each_entry(conn_dst, &bus->monitors_list, monitor_entry) {
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- /*
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- * Collect metadata requested by the destination connection.
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- * Ignore errors, as receivers need to check metadata
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- * availability, anyway. So it's still better to send messages
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- * that lack data, than to skip it entirely.
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- */
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- if (conn_src)
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- kdbus_kmsg_collect_metadata(kmsg, conn_src, conn_dst);
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+ if (conn_src) {
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+ ret = kdbus_kmsg_collect_metadata(kmsg, conn_src,
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+ conn_dst);
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+ if (ret < 0) {
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+ kdbus_conn_lost_message(conn_dst);
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+ continue;
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+ }
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+ }
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ret = kdbus_conn_entry_insert(conn_src, conn_dst, kmsg, NULL);
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if (ret < 0)
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