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pty: fix compat ioctls 

pointer-taking ones need compat_ptr(); int-taking one doesn't.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-09-12 20:53:46 -04:00
parent 82a6857bf9
commit 50f45326af
1 changed files with 12 additions and 2 deletions
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14
drivers/tty/pty.c
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@ -28,6 +28,7 @@
#include <linux/mount.h>
#include <linux/file.h>
#include <linux/ioctl.h>
#include <linux/compat.h>
#undef TTY_DEBUG_HANGUP
#ifdef TTY_DEBUG_HANGUP
@ -488,6 +489,7 @@ static int pty_bsd_ioctl(struct tty_struct *tty,
return -ENOIOCTLCMD;
}
#ifdef CONFIG_COMPAT
static long pty_bsd_compat_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
@ -495,8 +497,11 @@ static long pty_bsd_compat_ioctl(struct tty_struct *tty,
* PTY ioctls don't require any special translation between 32-bit and
* 64-bit userspace, they are already compatible.
*/
return pty_bsd_ioctl(tty, cmd, arg);
return pty_bsd_ioctl(tty, cmd, (unsigned long)compat_ptr(arg));
}
#else
#define pty_bsd_compat_ioctl NULL
#endif
static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
/*
@ -676,6 +681,7 @@ static int pty_unix98_ioctl(struct tty_struct *tty,
return -ENOIOCTLCMD;
}
#ifdef CONFIG_COMPAT
static long pty_unix98_compat_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
@ -683,8 +689,12 @@ static long pty_unix98_compat_ioctl(struct tty_struct *tty,
* PTY ioctls don't require any special translation between 32-bit and
* 64-bit userspace, they are already compatible.
*/
return pty_unix98_ioctl(tty, cmd, arg);
return pty_unix98_ioctl(tty, cmd,
cmd == TIOCSIG ? arg : (unsigned long)compat_ptr(arg));
}
#else
#define pty_unix98_compat_ioctl NULL
#endif
/**
* ptm_unix98_lookup - find a pty master