lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20230816105822.3685-4-jirislaby@kernel.org>
Date:   Wed, 16 Aug 2023 12:58:07 +0200
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Subject: [PATCH 2/4] n_tty: simplify and sanitize zero_buffer()

* Make 'tty' parameter const as we only look at tty flags here.
* Make 'size' parameter of size_t type as everyone passes that and
  memset() (the consumer) expects size_t too. So be consistent.
* Remove redundant local variables, place the content directly to the
  'if'.
* Use 0 instead of 0x00 in memset(). The former is more obvious.

No functional changes expected.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
---
 drivers/tty/n_tty.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 1599012f20c8..c1859ae263eb 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -158,13 +158,10 @@ static inline unsigned char *echo_buf_addr(struct n_tty_data *ldata, size_t i)
 }
 
 /* If we are not echoing the data, perhaps this is a secret so erase it */
-static void zero_buffer(struct tty_struct *tty, u8 *buffer, int size)
+static void zero_buffer(const struct tty_struct *tty, u8 *buffer, size_t size)
 {
-	bool icanon = !!L_ICANON(tty);
-	bool no_echo = !L_ECHO(tty);
-
-	if (icanon && no_echo)
-		memset(buffer, 0x00, size);
+	if (L_ICANON(tty) && !L_ECHO(tty))
+		memset(buffer, 0, size);
 }
 
 static void tty_copy(struct tty_struct *tty, void *to, size_t tail, size_t n)
-- 
2.41.0

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ