This is a note to let you know that I've just added the patch titled TTY: fix atime/mtime regression to the 3.8-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-3.8 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 @@ -941,6 +941,14 @@ 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 @@ -978,6 +986,9 @@ 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; } @@ -1078,8 +1089,11 @@ 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-3.8/tty-fix-atime-mtime-regression.patch queue-3.8/tty-do-not-update-atime-mtime-on-read-write.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html