Add ttyname_r() check

1 files changed, 13 insertions, 0 deletions

diff --git a/include/unistd.h b/include/unistd.h
index 3c5eec9..7a49da0 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -96,6 +96,17 @@ __fortify_read(int fd, void *buf, size_t n)
 }
 
 static inline __attribute__ ((always_inline))
+int
+__fortify_ttyname_r(int fd, char *name, size_t n)
+{
+        size_t bos = __builtin_object_size(name, 0);
+
+        if (n > bos)
+                __builtin_trap();
+        return ttyname_r(fd, name, n);
+}
+
+static inline __attribute__ ((always_inline))
 ssize_t
 __fortify_write(int fd, const void *buf, size_t n)
 {
@@ -126,6 +137,8 @@ __fortify_write(int fd, const void *buf, size_t n)
 #define pread(fd, buf, n, offset) __fortify_pread(fd, buf, n, offset)
 #undef read
 #define read(fd, buf, n) __fortify_read(fd, buf, n)
+#undef ttyname_r
+#define ttyname_r(fd, name, n) __fortify_ttyname_r(fd, name, n)
 #undef write
 #define write(fd, buf, n) __fortify_write(fd, buf, n)