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tty: audit: Never audit packet mode 

tty audit never logs pty master reads, but packet mode only works for
pty masters, so tty_audit_add_data() was never logging packet mode
anyway.

Don't audit packet mode data. As those are the lone call sites, remove
tty_put_user().

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2016-01-09 22:55:26 -08:00 committed by Greg Kroah-Hartman
parent d7c0ba40eb
commit eab25a5cd1
1 changed files with 4 additions and 13 deletions
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17
drivers/tty/n_tty.c
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@ -153,15 +153,6 @@ static inline unsigned char *echo_buf_addr(struct n_tty_data *ldata, size_t i)
return &ldata->echo_buf[i & (N_TTY_BUF_SIZE - 1)]; return &ldata->echo_buf[i & (N_TTY_BUF_SIZE - 1)];
} }
static inline int tty_put_user(struct tty_struct *tty, unsigned char x,
unsigned char __user *ptr)
{
struct n_tty_data *ldata = tty->disc_data;
tty_audit_add_data(tty, &x, 1, ldata->icanon);
return put_user(x, ptr);
}
static int tty_copy_to_user(struct tty_struct *tty, void __user *to, static int tty_copy_to_user(struct tty_struct *tty, void __user *to,
size_t tail, size_t n) size_t tail, size_t n)
{ {
@ -2197,11 +2188,11 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
cs = tty->link->ctrl_status; cs = tty->link->ctrl_status;
tty->link->ctrl_status = 0; tty->link->ctrl_status = 0;
spin_unlock_irq(&tty->link->ctrl_lock); spin_unlock_irq(&tty->link->ctrl_lock);
if (tty_put_user(tty, cs, b++)) { if (put_user(cs, b)) {
retval = -EFAULT; retval = -EFAULT;
b--;
break; break;
} }
b++;
nr--; nr--;
break; break;
} }
@ -2247,11 +2238,11 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
/* Deal with packet mode. */ /* Deal with packet mode. */
if (packet && b == buf) { if (packet && b == buf) {
if (tty_put_user(tty, TIOCPKT_DATA, b++)) { if (put_user(TIOCPKT_DATA, b)) {
retval = -EFAULT; retval = -EFAULT;
b--;
break; break;
} }
b++;
nr--; nr--;
} }