[PATCH] Fix tty layer DoS and comment relevant code

Unlike the other tty comment patch this one has code changes.  Specifically
it limits the queue size for a tty to 64K characters (128Kbytes) worst case
even if the tty is ignoring tty->throttle.  This is because certain drivers
don't honour the throttle value correctly, although it is a useful
safeguard anyway.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 2cef982..bb0d919 100644 (file)
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -275,6 +275,17 @@ static int check_tty_count(struct tty_struct *tty, const char *routine)
  *     Locking: none
  */
 
+
+/**
+ *     tty_buffer_free_all             -       free buffers used by a tty
+ *     @tty: tty to free from
+ *
+ *     Remove all the buffers pending on a tty whether queued with data
+ *     or in the free ring. Must be called when the tty is no longer in use
+ *
+ *     Locking: none
+ */
+
 static void tty_buffer_free_all(struct tty_struct *tty)
 {
        struct tty_buffer *thead;
@@ -287,19 +298,47 @@ static void tty_buffer_free_all(struct tty_struct *tty)
                kfree(thead);
        }
        tty->buf.tail = NULL;
+       tty->buf.memory_used = 0;
 }
 
+/**
+ *     tty_buffer_init         -       prepare a tty buffer structure
+ *     @tty: tty to initialise
+ *
+ *     Set up the initial state of the buffer management for a tty device.
+ *     Must be called before the other tty buffer functions are used.
+ *
+ *     Locking: none
+ */
+
 static void tty_buffer_init(struct tty_struct *tty)
 {
        spin_lock_init(&tty->buf.lock);
        tty->buf.head = NULL;
        tty->buf.tail = NULL;
        tty->buf.free = NULL;
+       tty->buf.memory_used = 0;
 }
 
-static struct tty_buffer *tty_buffer_alloc(size_t size)
+/**
+ *     tty_buffer_alloc        -       allocate a tty buffer
+ *     @tty: tty device
+ *     @size: desired size (characters)
+ *
+ *     Allocate a new tty buffer to hold the desired number of characters.
+ *     Return NULL if out of memory or the allocation would exceed the
+ *     per device queue
+ *
+ *     Locking: Caller must hold tty->buf.lock
+ */
+
+static struct tty_buffer *tty_buffer_alloc(struct tty_struct *tty, size_t size)
 {
-       struct tty_buffer *p = kmalloc(sizeof(struct tty_buffer) + 2 * size, GFP_ATOMIC);
+       struct tty_buffer *p;
+
+       if (tty->buf.memory_used + size > 65536)
+               return NULL;
+       p = kmalloc(sizeof(struct tty_buffer) + 2 * size, GFP_ATOMIC);
        if(p == NULL)
                return NULL;
        p->used = 0;
@@ -309,17 +348,27 @@ static struct tty_buffer *tty_buffer_alloc(size_t size)
        p->read = 0;
        p->char_buf_ptr = (char *)(p->data);
        p->flag_buf_ptr = (unsigned char *)p->char_buf_ptr + size;
-/*     printk("Flip create %p\n", p); */
+       tty->buf.memory_used += size;
        return p;
 }
 
-/* Must be called with the tty_read lock held. This needs to acquire strategy
-   code to decide if we should kfree or relink a given expired buffer */
+/**
+ *     tty_buffer_free         -       free a tty buffer
+ *     @tty: tty owning the buffer
+ *     @b: the buffer to free
+ *
+ *     Free a tty buffer, or add it to the free list according to our
+ *     internal strategy
+ *
+ *     Locking: Caller must hold tty->buf.lock
+ */
 
 static void tty_buffer_free(struct tty_struct *tty, struct tty_buffer *b)
 {
        /* Dumb strategy for now - should keep some stats */
-/*     printk("Flip dispose %p\n", b); */
+       tty->buf.memory_used -= b->size;
+       WARN_ON(tty->buf.memory_used < 0);
+
        if(b->size >= 512)
                kfree(b);
        else {
@@ -328,6 +377,18 @@ static void tty_buffer_free(struct tty_struct *tty, struct tty_buffer *b)
        }
 }
 
+/**
+ *     tty_buffer_find         -       find a free tty buffer
+ *     @tty: tty owning the buffer
+ *     @size: characters wanted
+ *
+ *     Locate an existing suitable tty buffer or if we are lacking one then
+ *     allocate a new one. We round our buffers off in 256 character chunks
+ *     to get better allocation behaviour.
+ *
+ *     Locking: Caller must hold tty->buf.lock
+ */
+
 static struct tty_buffer *tty_buffer_find(struct tty_struct *tty, size_t size)
 {
        struct tty_buffer **tbh = &tty->buf.free;
@@ -339,20 +400,28 @@ static struct tty_buffer *tty_buffer_find(struct tty_struct *tty, size_t size)
                        t->used = 0;
                        t->commit = 0;
                        t->read = 0;
-                       /* DEBUG ONLY */
-/*                     memset(t->data, '*', size); */
-/*                     printk("Flip recycle %p\n", t); */
+                       tty->buf.memory_used += t->size;
                        return t;
                }
                tbh = &((*tbh)->next);
        }
        /* Round the buffer size out */
        size = (size + 0xFF) & ~ 0xFF;
-       return tty_buffer_alloc(size);
+       return tty_buffer_alloc(tty, size);
        /* Should possibly check if this fails for the largest buffer we
           have queued and recycle that ? */
 }
 
+/**
+ *     tty_buffer_request_room         -       grow tty buffer if needed
+ *     @tty: tty structure
+ *     @size: size desired
+ *
+ *     Make at least size bytes of linear space available for the tty
+ *     buffer. If we fail return the size we managed to find.
+ *
+ *     Locking: Takes tty->buf.lock
+ */
 int tty_buffer_request_room(struct tty_struct *tty, size_t size)
 {
        struct tty_buffer *b, *n;

diff --git a/include/linux/tty.h b/include/linux/tty.h
index e421d5e..04827ca 100644 (file)
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -59,6 +59,7 @@ struct tty_bufhead {
        struct tty_buffer *head;        /* Queue head */
        struct tty_buffer *tail;        /* Active buffer */
        struct tty_buffer *free;        /* Free queue head */
+       int memory_used;                /* Buffer space used excluding free queue */
 };
 /*
  * The pty uses char_buf and flag_buf as a contiguous buffer