linux-kernel - Re: [PATCH] powerpc: add new required termio functions

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Message-ID: <20070912023319.GG9814@bakeyournoodle.com>
Date:	Wed, 12 Sep 2007 12:33:19 +1000
From:	tony@...eyournoodle.com (Tony Breeds)
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Michael Neuling <mikey@...ling.org>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, paulus@...ba.org,
	Alan Cox <alan@...hat.com>, akpm@...ux-foundation.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] powerpc: add new required termio functions

On Tue, Sep 11, 2007 at 07:17:42PM -0700, Linus Torvalds wrote:
 
> Really?
> 
> It shouldn't. The use of kernel_termios_to_user_termios_1() is conditional 
> on the architecture having a define for TCGETS2, and I think they match 
> up. I see:
> 
> 	[torvalds@...dy linux]$ git grep -l kernel_termios_to_user_termios_1 include | wc -l
> 	10
> 	[torvalds@...dy linux]$ git grep -l TCGETS2 include | wc -l
> 	10
> 
> and in neither case is ppc in that list of architecures.
> 
> So maybe you just read the patch without actually testing whether it 
> actually broke powerpc?
> 
> Or is something subtler going on?

As far as I can see TIOCSLCKTRMIOS and TIOCGLCKTRMIOS aren't protected
by TCGETS2 guards.  Do they need to be ...  Perhaps


From: Tony Breeds <tony@...eyournoodle.com>

Add Guards around TIOCSLCKTRMIOS and TIOCGLCKTRMIOS.

Signed-off-by: Tony Breeds <tony@...eyournoodle.com>

---

 drivers/char/tty_ioctl.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c
index 4a8969c..3ee73cf 100644
--- a/drivers/char/tty_ioctl.c
+++ b/drivers/char/tty_ioctl.c
@@ -795,6 +795,19 @@ int n_tty_ioctl(struct tty_struct * tty, struct file * file,
 			if (L_ICANON(tty))
 				retval = inq_canon(tty);
 			return put_user(retval, (unsigned int __user *) arg);
+#ifndef TCGETS2
+		case TIOCGLCKTRMIOS:
+			if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked))
+				return -EFAULT;
+			return 0;
+
+		case TIOCSLCKTRMIOS:
+			if (!capable(CAP_SYS_ADMIN))
+				return -EPERM;
+			if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg))
+				return -EFAULT;
+			return 0;
+#else
 		case TIOCGLCKTRMIOS:
 			if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios_locked))
 				return -EFAULT;
@@ -806,6 +819,7 @@ int n_tty_ioctl(struct tty_struct * tty, struct file * file,
 			if (user_termios_to_kernel_termios_1(real_tty->termios_locked, (struct termios __user *) arg))
 				return -EFAULT;
 			return 0;
+#endif
 
 		case TIOCPKT:
 		{

Yours Tony

  linux.conf.au        http://linux.conf.au/ || http://lca2008.linux.org.au/
  Jan 28 - Feb 02 2008 The Australian Linux Technical Conference!

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