You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.2 KiB
49 lines
1.2 KiB
From 0a950dcf15bb9f7274c804dca490e9e20e475f3e Mon Sep 17 00:00:00 2001
|
|
From: Szabolcs Nagy <nsz@port70.net>
|
|
Date: Sat, 20 Aug 2016 21:04:31 +0200
|
|
Subject: verify that ttyname refers to the same file as the fd
|
|
|
|
linux containers use separate mount namespace so the /proc
|
|
symlink might not point to the right device if the fd was
|
|
opened in the parent namespace, in this case return ENOENT.
|
|
---
|
|
src/unistd/ttyname_r.c | 15 +++++++++++----
|
|
1 file changed, 11 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/src/unistd/ttyname_r.c b/src/unistd/ttyname_r.c
|
|
index 8bac7b2..a38ba4f 100644
|
|
--- a/src/unistd/ttyname_r.c
|
|
+++ b/src/unistd/ttyname_r.c
|
|
@@ -1,10 +1,12 @@
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
+#include <sys/stat.h>
|
|
|
|
void __procfdname(char *, unsigned);
|
|
|
|
int ttyname_r(int fd, char *name, size_t size)
|
|
{
|
|
+ struct stat st1, st2;
|
|
char procname[sizeof "/proc/self/fd/" + 3*sizeof(int) + 2];
|
|
ssize_t l;
|
|
|
|
@@ -15,8 +17,13 @@ int ttyname_r(int fd, char *name, size_t size)
|
|
|
|
if (l < 0) return errno;
|
|
else if (l == size) return ERANGE;
|
|
- else {
|
|
- name[l] = 0;
|
|
- return 0;
|
|
- }
|
|
+
|
|
+ name[l] = 0;
|
|
+
|
|
+ if (stat(name, &st1) || fstat(fd, &st2))
|
|
+ return errno;
|
|
+ if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
|
|
+ return ENOENT;
|
|
+
|
|
+ return 0;
|
|
}
|
|
--
|
|
cgit v0.11.2
|
|
|