*/
#include <linux/audit.h>
-#include <linux/file.h>
+#include <linux/slab.h>
#include <linux/tty.h>
struct tty_audit_buf {
{
struct tty_audit_buf *buf;
- buf = kmalloc(sizeof (*buf), GFP_KERNEL);
+ buf = kmalloc(sizeof(*buf), GFP_KERNEL);
if (!buf)
goto err;
- if (PAGE_SIZE != N_TTY_BUF_SIZE)
- buf->data = kmalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
- else
- buf->data = (unsigned char *)__get_free_page(GFP_KERNEL);
+ buf->data = kmalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
if (!buf->data)
goto err_buf;
atomic_set(&buf->count, 1);
static void tty_audit_buf_free(struct tty_audit_buf *buf)
{
WARN_ON(buf->valid != 0);
- if (PAGE_SIZE != N_TTY_BUF_SIZE)
- kfree(buf->data);
- else
- free_page((unsigned long)buf->data);
+ kfree(buf->data);
kfree(buf);
}
tty_audit_buf_free(buf);
}
+static void tty_audit_log(const char *description, struct task_struct *tsk,
+ uid_t loginuid, unsigned sessionid, int major,
+ int minor, unsigned char *data, size_t size)
+{
+ struct audit_buffer *ab;
+
+ ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_TTY);
+ if (ab) {
+ char name[sizeof(tsk->comm)];
+ uid_t uid = task_uid(tsk);
+
+ audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u "
+ "major=%d minor=%d comm=", description,
+ tsk->pid, uid, loginuid, sessionid,
+ major, minor);
+ get_task_comm(name, tsk);
+ audit_log_untrustedstring(ab, name);
+ audit_log_format(ab, " data=");
+ audit_log_n_hex(ab, data, size);
+ audit_log_end(ab);
+ }
+}
+
/**
* tty_audit_buf_push - Push buffered data out
*
* @tsk with @loginuid. @buf->mutex must be locked.
*/
static void tty_audit_buf_push(struct task_struct *tsk, uid_t loginuid,
+ unsigned int sessionid,
struct tty_audit_buf *buf)
{
- struct audit_buffer *ab;
-
if (buf->valid == 0)
return;
if (audit_enabled == 0)
return;
- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_TTY);
- if (ab) {
- char name[sizeof(tsk->comm)];
-
- audit_log_format(ab, "tty pid=%u uid=%u auid=%u major=%d "
- "minor=%d comm=", tsk->pid, tsk->uid,
- loginuid, buf->major, buf->minor);
- get_task_comm(name, tsk);
- audit_log_untrustedstring(ab, name);
- audit_log_format(ab, " data=");
- audit_log_n_untrustedstring(ab, buf->valid, buf->data);
- audit_log_end(ab);
- }
+ tty_audit_log("tty", tsk, loginuid, sessionid, buf->major, buf->minor,
+ buf->data, buf->valid);
buf->valid = 0;
}
*/
static void tty_audit_buf_push_current(struct tty_audit_buf *buf)
{
- tty_audit_buf_push(current, audit_get_loginuid(current->audit_context),
- buf);
+ uid_t auid = audit_get_loginuid(current);
+ unsigned int sessionid = audit_get_sessionid(current);
+ tty_audit_buf_push(current, auid, sessionid, buf);
}
/**
spin_lock_irq(¤t->sighand->siglock);
sig->audit_tty = current->signal->audit_tty;
spin_unlock_irq(¤t->sighand->siglock);
- sig->tty_audit_buf = NULL;
+}
+
+/**
+ * tty_audit_tiocsti - Log TIOCSTI
+ */
+void tty_audit_tiocsti(struct tty_struct *tty, char ch)
+{
+ struct tty_audit_buf *buf;
+ int major, minor, should_audit;
+
+ spin_lock_irq(¤t->sighand->siglock);
+ should_audit = current->signal->audit_tty;
+ buf = current->signal->tty_audit_buf;
+ if (buf)
+ atomic_inc(&buf->count);
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ major = tty->driver->major;
+ minor = tty->driver->minor_start + tty->index;
+ if (buf) {
+ mutex_lock(&buf->mutex);
+ if (buf->major == major && buf->minor == minor)
+ tty_audit_buf_push_current(buf);
+ mutex_unlock(&buf->mutex);
+ tty_audit_buf_put(buf);
+ }
+
+ if (should_audit && audit_enabled) {
+ uid_t auid;
+ unsigned int sessionid;
+
+ auid = audit_get_loginuid(current);
+ sessionid = audit_get_sessionid(current);
+ tty_audit_log("ioctl=TIOCSTI", current, auid, sessionid, major,
+ minor, &ch, 1);
+ }
}
/**
* tty_audit_push_task - Flush task's pending audit data
*/
-void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid)
+void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid, u32 sessionid)
{
struct tty_audit_buf *buf;
return;
mutex_lock(&buf->mutex);
- tty_audit_buf_push(tsk, loginuid, buf);
+ tty_audit_buf_push(tsk, loginuid, sessionid, buf);
mutex_unlock(&buf->mutex);
tty_audit_buf_put(buf);
if (unlikely(size == 0))
return;
+ if (tty->driver->type == TTY_DRIVER_TYPE_PTY
+ && tty->driver->subtype == PTY_TYPE_MASTER)
+ return;
+
buf = tty_audit_buf_get(tty);
if (!buf)
return;
tty_audit_buf_put(buf);
}
}
-
-/**
- * tty_audit_opening - A TTY is being opened.
- *
- * As a special hack, tasks that close all their TTYs and open new ones
- * are assumed to be system daemons (e.g. getty) and auditing is
- * automatically disabled for them.
- */
-void tty_audit_opening(void)
-{
- int disable;
-
- disable = 1;
- spin_lock_irq(¤t->sighand->siglock);
- if (current->signal->audit_tty == 0)
- disable = 0;
- spin_unlock_irq(¤t->sighand->siglock);
- if (!disable)
- return;
-
- task_lock(current);
- if (current->files) {
- struct fdtable *fdt;
- unsigned i;
-
- /*
- * We don't take a ref to the file, so we must hold ->file_lock
- * instead.
- */
- spin_lock(¤t->files->file_lock);
- fdt = files_fdtable(current->files);
- for (i = 0; i < fdt->max_fds; i++) {
- struct file *filp;
-
- filp = fcheck_files(current->files, i);
- if (filp && is_tty(filp)) {
- disable = 0;
- break;
- }
- }
- spin_unlock(¤t->files->file_lock);
- }
- task_unlock(current);
- if (!disable)
- return;
-
- spin_lock_irq(¤t->sighand->siglock);
- current->signal->audit_tty = 0;
- spin_unlock_irq(¤t->sighand->siglock);
-}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff