X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=fio.c;h=9c556705f124d1365afca2aac2e3712b61a1a2c7;hp=a85f577624ab7912b9893ba83dc383ef0fd53022;hb=7ed4d7abf0d7720d532d9680ebf69745d9270a5e;hpb=8bad3c5b15c221cbd141a357d8ba81ca4cc45cac

diff --git a/fio.c b/fio.c
index a85f5776..9c556705 100644
--- a/fio.c
+++ b/fio.c
@@ -1070,14 +1070,18 @@ static void *thread_main(void *data)
 	 */
 	fio_mutex_remove(td->mutex);
 
-	if (td->o.uid != -1U && setuid(td->o.uid)) {
-		td_verror(td, errno, "setuid");
-		goto err;
-	}
+	/*
+	 * A new gid requires privilege, so we need to do this before setting
+	 * the uid.
+	 */
 	if (td->o.gid != -1U && setgid(td->o.gid)) {
 		td_verror(td, errno, "setgid");
 		goto err;
 	}
+	if (td->o.uid != -1U && setuid(td->o.uid)) {
+		td_verror(td, errno, "setuid");
+		goto err;
+	}
 
 	/*
 	 * May alter parameters that init_io_u() will use, so we need to