This is a note to let you know that I've just added the patch titled
TTY: fix atime/mtime regression
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tty-fix-atime-mtime-regression.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 37b7f3c76595e23257f61bd80b223de8658617ee Mon Sep 17 00:00:00 2001
From: Jiri Slaby <jslaby@xxxxxxx>
Date: Fri, 26 Apr 2013 13:48:53 +0200
Subject: TTY: fix atime/mtime regression
From: Jiri Slaby <jslaby@xxxxxxx>
commit 37b7f3c76595e23257f61bd80b223de8658617ee upstream.
In commit b0de59b5733d ("TTY: do not update atime/mtime on read/write")
we removed timestamps from tty inodes to fix a security issue and waited
if something breaks. Well, 'w', the utility to find out logged users
and their inactivity time broke. It shows that users are inactive since
the time they logged in.
To revert to the old behaviour while still preventing attackers to
guess the password length, we update the timestamps in one-minute
intervals by this patch.
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/tty_io.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -938,6 +938,14 @@ void start_tty(struct tty_struct *tty)
EXPORT_SYMBOL(start_tty);
+static void tty_update_time(struct timespec *time)
+{
+ unsigned long sec = get_seconds();
+ sec -= sec % 60;
+ if ((long)(sec - time->tv_sec) > 0)
+ time->tv_sec = sec;
+}
+
/**
* tty_read - read method for tty device files
* @file: pointer to tty file
@@ -975,6 +983,9 @@ static ssize_t tty_read(struct file *fil
i = -EIO;
tty_ldisc_deref(ld);
+ if (i > 0)
+ tty_update_time(&inode->i_atime);
+
return i;
}
@@ -1075,8 +1086,11 @@ static inline ssize_t do_tty_write(
break;
cond_resched();
}
- if (written)
+ if (written) {
+ struct inode *inode = file->f_path.dentry->d_inode;
+ tty_update_time(&inode->i_mtime);
ret = written;
+ }
out:
tty_write_unlock(tty);
return ret;
Patches currently in stable-queue which might be from jslaby@xxxxxxx are
queue-3.4/tty-fix-atime-mtime-regression.patch
queue-3.4/tty-do-not-update-atime-mtime-on-read-write.patch
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