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From: Fuqian Huang <huangfq.daxian@gmail.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Fuqian Huang <huangfq.daxian@gmail.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jslaby@suse.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH v5 01/02] tty: rocket: Remove RCPK_GET_STRUCT ioctl
Date: Thu, 18 Apr 2019 12:35:57 +0800	[thread overview]
Message-ID: <20190418043558.10577-1-huangfq.daxian@gmail.com> (raw)

If the cmd is RCPK_GET_STRUCT, copy_to_user will copy
info to user space. As info->port.ops is the address of
a constant object rocket_port_ops (assigned in init_r_port),
a kernel address leakage happens.

Remove the RCPK_GET_STRUCT ioctl.

Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
---
 drivers/tty/rocket.c | 4 ----
 drivers/tty/rocket.h | 1 -
 2 files changed, 5 deletions(-)

diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index b121d8f8f3d7..b6543e28bd8b 100644
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -1283,10 +1283,6 @@ static int rp_ioctl(struct tty_struct *tty,
 		return -ENXIO;
 
 	switch (cmd) {
-	case RCKP_GET_STRUCT:
-		if (copy_to_user(argp, info, sizeof (struct r_port)))
-			ret = -EFAULT;
-		break;
 	case RCKP_GET_CONFIG:
 		ret = get_config(info, argp);
 		break;
diff --git a/drivers/tty/rocket.h b/drivers/tty/rocket.h
index d0560203f215..d62ed6587f32 100644
--- a/drivers/tty/rocket.h
+++ b/drivers/tty/rocket.h
@@ -71,7 +71,6 @@ struct rocket_version {
 /*
  * Rocketport ioctls -- "RP"
  */
-#define RCKP_GET_STRUCT		0x00525001
 #define RCKP_GET_CONFIG		0x00525002
 #define RCKP_SET_CONFIG		0x00525003
 #define RCKP_GET_PORTS		0x00525004
-- 
2.11.0


             reply	other threads:[~2019-04-18  4:36 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-18  4:35 Fuqian Huang [this message]
2019-04-18  4:35 ` [PATCH v5 02/02] tty: rocket: deprecate the rp_ioctl Fuqian Huang
2019-04-18  6:59   ` Greg Kroah-Hartman

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