From e8b9466fc9d4aec66476f1bc7a48436da02ab557 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Mon, 29 Jun 2009 19:06:45 -0400 Subject: [PATCH] libuuid: Make sure fd's 0, 1, and 2 are valid before exec'ing uuidd When closing all of the file descriptors before starting uuidd, make sure file descriptors 0, 1, and 2 are reserved by opening /dev/null. This prevents strange bugs caused by assumptions regarding file descriptors <= 2 as being special. Signed-off-by: "Theodore Ts'o" --- lib/uuid/gen_uuid.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/lib/uuid/gen_uuid.c b/lib/uuid/gen_uuid.c index b7a12ee..aa313ef 100644 --- a/lib/uuid/gen_uuid.c +++ b/lib/uuid/gen_uuid.c @@ -455,8 +455,11 @@ static void close_all_fds(void) max = OPEN_MAX; #endif - for (i=0; i < max; i++) + for (i=0; i < max; i++) { close(i); + if (i <= 2) + open("/dev/null", O_RDWR); + } } -- 1.8.3.1