vt: vt_ioctl: fix use-after-free in vt_in_use()

commit 7cf64b18b0b96e751178b8d0505d8466ff5a448f upstream.

vt_in_use() dereferences console_driver->ttys[i] without proper locking.
This is broken because the tty can be closed and freed concurrently.

We could fix this by using 'READ_ONCE(console_driver->ttys[i]) != NULL'
and skipping the check of tty_struct::count.  But, looking at
console_driver->ttys[i] isn't really appropriate anyway because even if
it is NULL the tty can still be in the process of being closed.

Instead, fix it by making vt_in_use() require console_lock() and check
whether the vt is allocated and has port refcount > 1.  This works since
following the patch "vt: vt_ioctl: fix VT_DISALLOCATE freeing in-use
virtual console" the port refcount is incremented while the vt is open.

Reproducer (very unreliable, but it worked for me after a few minutes):

	#include <fcntl.h>
	#include <linux/vt.h>

	int main()
	{
		int fd, nproc;
		struct vt_stat state;
		char ttyname[16];

		fd = open("/dev/tty10", O_RDONLY);
		for (nproc = 1; nproc < 8; nproc *= 2)
			fork();
		for (;;) {
			sprintf(ttyname, "/dev/tty%d", rand() % 8);
			close(open(ttyname, O_RDONLY));
			ioctl(fd, VT_GETSTATE, &state);
		}
	}

KASAN report:

	BUG: KASAN: use-after-free in vt_in_use drivers/tty/vt/vt_ioctl.c:48 [inline]
	BUG: KASAN: use-after-free in vt_ioctl+0x1ad3/0x1d70 drivers/tty/vt/vt_ioctl.c:657
	Read of size 4 at addr ffff888065722468 by task syz-vt2/132

	CPU: 0 PID: 132 Comm: syz-vt2 Not tainted 5.6.0-rc5-00130-g089b6d3654916 #13
	Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20191223_100556-anatol 04/01/2014
	Call Trace:
	 [...]
	 vt_in_use drivers/tty/vt/vt_ioctl.c:48 [inline]
	 vt_ioctl+0x1ad3/0x1d70 drivers/tty/vt/vt_ioctl.c:657
	 tty_ioctl+0x9db/0x11b0 drivers/tty/tty_io.c:2660
	 [...]

	Allocated by task 136:
	 [...]
	 kzalloc include/linux/slab.h:669 [inline]
	 alloc_tty_struct+0x96/0x8a0 drivers/tty/tty_io.c:2982
	 tty_init_dev+0x23/0x350 drivers/tty/tty_io.c:1334
	 tty_open_by_driver drivers/tty/tty_io.c:1987 [inline]
	 tty_open+0x3ca/0xb30 drivers/tty/tty_io.c:2035
	 [...]

	Freed by task 41:
	 [...]
	 kfree+0xbf/0x200 mm/slab.c:3757
	 free_tty_struct+0x8d/0xb0 drivers/tty/tty_io.c:177
	 release_one_tty+0x22d/0x2f0 drivers/tty/tty_io.c:1468
	 process_one_work+0x7f1/0x14b0 kernel/workqueue.c:2264
	 worker_thread+0x8b/0xc80 kernel/workqueue.c:2410
	 [...]

Fixes: 4001d7b7fc27 ("vt: push down the tty lock so we can see what is left to tackle")
Cc: <stable@vger.kernel.org> # v3.4+
Acked-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20200322034305.210082-3-ebiggers@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
index 28c5b24..4ed0d77 100644 (file)
--- a/drivers/tty/vt/vt_ioctl.c
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -42,9 +42,15 @@ bool vt_dont_switch;
 
 static inline bool vt_in_use(unsigned int i)
 {
-       extern struct tty_driver *console_driver;
+       const struct vc_data *vc = vc_cons[i].d;
 
-       return console_driver->ttys[i] && console_driver->ttys[i]->count;
+       /*
+        * console_lock must be held to prevent the vc from being deallocated
+        * while we're checking whether it's in-use.
+        */
+       WARN_CONSOLE_UNLOCKED();
+
+       return vc && kref_read(&vc->port.kref) > 1;
 }
 
 static inline bool vt_busy(int i)
@@ -646,15 +652,16 @@ int vt_ioctl(struct tty_struct *tty,
                struct vt_stat __user *vtstat = up;
                unsigned short state, mask;
 
-               /* Review: FIXME: Console lock ? */
                if (put_user(fg_console + 1, &vtstat->v_active))
                        ret = -EFAULT;
                else {
                        state = 1;      /* /dev/tty0 is always open */
+                       console_lock(); /* required by vt_in_use() */
                        for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
                                                        ++i, mask <<= 1)
                                if (vt_in_use(i))
                                        state |= mask;
+                       console_unlock();
                        ret = put_user(state, &vtstat->v_state);
                }
                break;
@@ -664,10 +671,11 @@ int vt_ioctl(struct tty_struct *tty,
         * Returns the first available (non-opened) console.
         */
        case VT_OPENQRY:
-               /* FIXME: locking ? - but then this is a stupid API */
+               console_lock(); /* required by vt_in_use() */
                for (i = 0; i < MAX_NR_CONSOLES; ++i)
                        if (!vt_in_use(i))
                                break;
+               console_unlock();
                uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
                goto setint;