From: David Howells <dhowells@redhat.com>
The attached patch creates a generic set of termio userspace access functions
with proper error handling. None of the current archs check for errors in
this case.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/include/asm-generic/termios.h | 69 ++++++++++++++++++++++++++++++++++
1 files changed, 69 insertions(+)
diff -puN /dev/null include/asm-generic/termios.h
--- /dev/null Thu Apr 11 07:25:15 2002
+++ 25-akpm/include/asm-generic/termios.h Mon Nov 8 14:48:43 2004
@@ -0,0 +1,69 @@
+/* termios.h: generic termios/termio user copying/translation
+ */
+
+#ifndef _ASM_GENERIC_TERMIOS_H
+#define _ASM_GENERIC_TERMIOS_H
+
+#include <asm/uaccess.h>
+
+#ifndef __ARCH_TERMIO_GETPUT
+
+/*
+ * Translate a "termio" structure into a "termios". Ugh.
+ */
+static inline int user_termio_to_kernel_termios(struct termios *termios,
+ struct termio __user *termio)
+{
+ unsigned short tmp;
+
+ if (get_user(tmp, &termio->c_iflag) < 0)
+ goto fault;
+ termios->c_iflag = (0xffff0000 & termios->c_iflag) | tmp;
+
+ if (get_user(tmp, &termio->c_oflag) < 0)
+ goto fault;
+ termios->c_oflag = (0xffff0000 & termios->c_oflag) | tmp;
+
+ if (get_user(tmp, &termio->c_cflag) < 0)
+ goto fault;
+ termios->c_cflag = (0xffff0000 & termios->c_cflag) | tmp;
+
+ if (get_user(tmp, &termio->c_lflag) < 0)
+ goto fault;
+ termios->c_lflag = (0xffff0000 & termios->c_lflag) | tmp;
+
+ if (get_user(termios->c_line, &termio->c_line) < 0)
+ goto fault;
+
+ if (copy_from_user(termios->c_cc, termio->c_cc, NCC) != 0)
+ goto fault;
+
+ return 0;
+
+ fault:
+ return -EFAULT;
+}
+
+/*
+ * Translate a "termios" structure into a "termio". Ugh.
+ */
+static inline int kernel_termios_to_user_termio(struct termio __user *termio,
+ struct termios *termios)
+{
+ if (put_user(termios->c_iflag, &termio->c_iflag) < 0 ||
+ put_user(termios->c_oflag, &termio->c_oflag) < 0 ||
+ put_user(termios->c_cflag, &termio->c_cflag) < 0 ||
+ put_user(termios->c_lflag, &termio->c_lflag) < 0 ||
+ put_user(termios->c_line, &termio->c_line) < 0 ||
+ copy_to_user(termio->c_cc, termios->c_cc, NCC) != 0)
+ return -EFAULT;
+
+ return 0;
+}
+
+#define user_termios_to_kernel_termios(k, u) copy_from_user(k, u, sizeof(struct termios))
+#define kernel_termios_to_user_termios(u, k) copy_to_user(u, k, sizeof(struct termios))
+
+#endif /* __ARCH_TERMIO_GETPUT */
+
+#endif /* _ASM_GENERIC_TERMIOS_H */
_