From 33d2ff5aa8b0bee2ba886857db4acfa9126e8b6d Mon Sep 17 00:00:00 2001
From: sin
Date: Sat, 28 Feb 2015 15:30:25 +0000
Subject: Add ttyname_r() check

---
 include/unistd.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'include/unistd.h')

diff --git a/include/unistd.h b/include/unistd.h
index 3c5eec9..7a49da0 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -95,6 +95,17 @@ __fortify_read(int fd, void *buf, size_t n)
 	return read(fd, buf, 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)
 
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