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tty: audit: Track tty association with dev_t 

Use dev_t instead of separate major/minor fields to track tty
audit buffer association.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2016-01-09 22:55:32 -08:00 committed by Greg Kroah-Hartman
parent 37282a7795
commit 4d240b6442
1 changed files with 14 additions and 18 deletions
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32
drivers/tty/tty_audit.c
View File

@ -16,7 +16,7 @@
struct tty_audit_buf {
atomic_t count;
struct mutex mutex; /* Protects all data below */
int major, minor; /* The TTY which the data is from */
dev_t dev; /* The TTY which the data is from */
unsigned icanon:1;
size_t valid;
unsigned char *data; /* Allocated size N_TTY_BUF_SIZE */
@ -34,8 +34,7 @@ static struct tty_audit_buf *tty_audit_buf_alloc(void)
goto err_buf;
atomic_set(&buf->count, 1);
mutex_init(&buf->mutex);
buf->major = 0;
buf->minor = 0;
buf->dev = MKDEV(0, 0);
buf->icanon = 0;
buf->valid = 0;
return buf;
@ -59,7 +58,7 @@ static void tty_audit_buf_put(struct tty_audit_buf *buf)
tty_audit_buf_free(buf);
}
static void tty_audit_log(const char *description, int major, int minor,
static void tty_audit_log(const char *description, dev_t dev,
unsigned char *data, size_t size)
{
struct audit_buffer *ab;
@ -75,7 +74,7 @@ static void tty_audit_log(const char *description, int major, int minor,
audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u major=%d"
" minor=%d comm=", description, pid, uid,
loginuid, sessionid, major, minor);
loginuid, sessionid, MAJOR(dev), MINOR(dev));
get_task_comm(name, tsk);
audit_log_untrustedstring(ab, name);
audit_log_format(ab, " data=");
@ -98,7 +97,7 @@ static void tty_audit_buf_push(struct tty_audit_buf *buf)
buf->valid = 0;
return;
}
tty_audit_log("tty", buf->major, buf->minor, buf->data, buf->valid);
tty_audit_log("tty", buf->dev, buf->data, buf->valid);
buf->valid = 0;
}
@ -141,7 +140,8 @@ void tty_audit_fork(struct signal_struct *sig)
void tty_audit_tiocsti(struct tty_struct *tty, char ch)
{
struct tty_audit_buf *buf;
int major, minor, should_audit;
dev_t dev;
int should_audit;
unsigned long flags;
spin_lock_irqsave(&current->sighand->siglock, flags);
@ -151,11 +151,10 @@ void tty_audit_tiocsti(struct tty_struct *tty, char ch)
atomic_inc(&buf->count);
spin_unlock_irqrestore(&current->sighand->siglock, flags);
major = tty->driver->major;
minor = tty->driver->minor_start + tty->index;
dev = MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
if (buf) {
mutex_lock(&buf->mutex);
if (buf->major == major && buf->minor == minor)
if (buf->dev == dev)
tty_audit_buf_push(buf);
mutex_unlock(&buf->mutex);
tty_audit_buf_put(buf);
@ -167,7 +166,7 @@ void tty_audit_tiocsti(struct tty_struct *tty, char ch)
auid = audit_get_loginuid(current);
sessionid = audit_get_sessionid(current);
tty_audit_log("ioctl=TIOCSTI", major, minor, &ch, 1);
tty_audit_log("ioctl=TIOCSTI", dev, &ch, 1);
}
}
@ -260,10 +259,10 @@ static struct tty_audit_buf *tty_audit_buf_get(void)
void tty_audit_add_data(struct tty_struct *tty, const void *data, size_t size)
{
struct tty_audit_buf *buf;
int major, minor;
int audit_log_tty_passwd;
unsigned long flags;
unsigned int icanon = !!L_ICANON(tty);
dev_t dev;
if (unlikely(size == 0))
return;
@ -283,13 +282,10 @@ void tty_audit_add_data(struct tty_struct *tty, const void *data, size_t size)
return;
mutex_lock(&buf->mutex);
major = tty->driver->major;
minor = tty->driver->minor_start + tty->index;
if (buf->major != major || buf->minor != minor
|| buf->icanon != icanon) {
dev = MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
if (buf->dev != dev || buf->icanon != icanon) {
tty_audit_buf_push(buf);
buf->major = major;
buf->minor = minor;
buf->dev = dev;
buf->icanon = icanon;
}
do {