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Groups > linux.kernel > #1305487

[PATCH v2 02/15] tty: audit: Never audit packet mode

From Peter Hurley <peter@hurleysoftware.com>
Newsgroups linux.kernel
Subject [PATCH v2 02/15] tty: audit: Never audit packet mode
Date 2016-01-10 08:00 +0100
Message-ID <qPi8P-Fk-19@gated-at.bofh.it> (permalink)
References <qPgql-84a-1@gated-at.bofh.it> <qPi8O-Fk-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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>
---
 drivers/tty/n_tty.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 90eca26..eeae6bc 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -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)];
 }
 
-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,
 			    size_t tail, size_t n)
 {
@@ -2203,11 +2194,11 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 			cs = tty->link->ctrl_status;
 			tty->link->ctrl_status = 0;
 			spin_unlock_irq(&tty->link->ctrl_lock);
-			if (tty_put_user(tty, cs, b++)) {
+			if (put_user(cs, b)) {
 				retval = -EFAULT;
-				b--;
 				break;
 			}
+			b++;
 			nr--;
 			break;
 		}
@@ -2253,11 +2244,11 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 
 			/* Deal with packet mode. */
 			if (packet && b == buf) {
-				if (tty_put_user(tty, TIOCPKT_DATA, b++)) {
+				if (put_user(TIOCPKT_DATA, b)) {
 					retval = -EFAULT;
-					b--;
 					break;
 				}
+				b++;
 				nr--;
 			}
 
-- 
2.7.0

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Thread

[RESEND][PATCH 00/15] Rework tty audit Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 11/15] tty: audit: Remove tty_audit_buf reference counting Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 15/15] tty: audit: Poison tty_audit_buf while process exits Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 02/15] tty: audit: Never audit packet mode Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 03/15] tty: audit: Remove icanon mode from call chain Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 09/15] tty: audit: Handle tty audit enable atomically Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 04/15] tty: audit: Defer audit buffer association Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 06/15] tty: audit: Ignore current association for audit push Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
    Re: [RESEND][PATCH 06/15] tty: audit: Ignore current association for  audit push kbuild test robot <lkp@intel.com> - 2016-01-10 06:40 +0100
      Re: [RESEND][PATCH 06/15] tty: audit: Ignore current association for  audit push Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:10 +0100
  [RESEND][PATCH 14/15] tty: audit: Always push audit buffer before TIOCSTI Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 05/15] tty: audit: Take siglock directly Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 13/15] tty: audit: Check audit enable first Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 12/15] tty: audit: Simplify first-use allocation Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 01/15] tty: audit: Early-out pty master reads earlier Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 08/15] tty: audit: Track tty association with dev_t Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 07/15] tty: audit: Combine push functions Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [RESEND][PATCH 10/15] tty: audit: Remove false memory optimization Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 06:10 +0100
  [PATCH v2 12/15] tty: audit: Simplify first-use allocation Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:00 +0100
  [PATCH v2 11/15] tty: audit: Remove tty_audit_buf reference counting Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:00 +0100
  [PATCH v2 00/15] Rework tty audit Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:00 +0100
    [PATCH v2 02/15] tty: audit: Never audit packet mode Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:00 +0100
    [PATCH v2 15/15] tty: audit: Poison tty_audit_buf while process exits Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:00 +0100
    [PATCH v2 10/15] tty: audit: Remove false memory optimization Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:00 +0100
    [PATCH v2 09/15] tty: audit: Handle tty audit enable atomically Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:00 +0100
    [PATCH v2 14/15] tty: audit: Always push audit buffer before TIOCSTI Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:00 +0100
    [PATCH v2 13/15] tty: audit: Check audit enable first Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:00 +0100
    [PATCH v2 01/15] tty: audit: Early-out pty master reads earlier Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:00 +0100
    [PATCH v2 08/15] tty: audit: Track tty association with dev_t Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:00 +0100
    [PATCH v2 04/15] tty: audit: Defer audit buffer association Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:10 +0100
    [PATCH v2 03/15] tty: audit: Remove icanon mode from call chain Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:10 +0100
    [PATCH v2 05/15] tty: audit: Take siglock directly Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:10 +0100
    [PATCH v2 07/15] tty: audit: Combine push functions Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:10 +0100
    [PATCH v2 06/15] tty: audit: Ignore current association for audit push Peter Hurley <peter@hurleysoftware.com> - 2016-01-10 08:10 +0100

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