Fix bug #7067 - Linux asynchronous IO (aio) can cause smbd to fail to respond to a read or write.

Only works on Linux kernels 2.6.26 and above. Grants CAP_KILL capability
to allow Linux threads under different euids to send signals to each other.

Jeremy.

1 files changed, 8 insertions, 0 deletions

diff --git a/source3/smbd/server.c b/source3/smbd/server.c
index 09ad8d8ea5..fb0efd2ae5 100644
--- a/source3/smbd/server.c
+++ b/source3/smbd/server.c
@@ -1047,6 +1047,14 @@ extern void build_options(bool screen);
 	gain_root_privilege();
 	gain_root_group_privilege();
 
+	/*
+	 * Ensure we have CAP_KILL capability set on Linux,
+	 * where we need this to communicate with threads.
+	 * This is inherited by new threads, but not by new
+	 * processes across exec().
+	 */
+	set_effective_capability(KILL_CAPABILITY);
+
 	fault_setup((void (*)(void *))exit_server_fault);
 	dump_core_setup("smbd");