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Date: Sun, 28 Apr 2019 05:31:53 -0400
From: Qiang Huang <>
To: <>
Subject: [PATCH] mq_open: Perform check for mq name

According to Linux man page:

C library/kernel differences
   The mq_open() library function is implemented on top of a system call
   of the same name.  The library function performs the check that the
   name starts with a slash (/), giving the EINVAL error if it does not.
   The kernel system call expects name to contain no preceding slash, so
   the C library function passes name without the preceding slash (i.e.,
   name+1) to the system call.

glibc performs the check but musl doesn't, add the
check so we can have consistent behavior.

Signed-off-by: Qiang Huang <>
 src/mq/mq_open.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/mq/mq_open.c b/src/mq/mq_open.c
index aa91d58..e626228 100644
--- a/src/mq/mq_open.c
+++ b/src/mq/mq_open.c
@@ -1,12 +1,14 @@
 #include <mqueue.h>
 #include <fcntl.h>
 #include <stdarg.h>
+#include <errno.h>
 #include "syscall.h"
 mqd_t mq_open(const char *name, int flags, ...)
 	mode_t mode = 0;
 	struct mq_attr *attr = 0;
+	if (name[0] != '/') return __syscall_ret(-EINVAL);
 	if (*name == '/') name++;
 	if (flags & O_CREAT) {
 		va_list ap;

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