KEYS: trusted: fix writing past end of buffer in trusted_read()

commit a3c812f7cfd80cf51e8f5b7034f7418f6beb56c1 upstream.

When calling keyctl_read() on a key of type "trusted", if the
user-supplied buffer was too small, the kernel ignored the buffer length
and just wrote past the end of the buffer, potentially corrupting
userspace memory.  Fix it by instead returning the size required, as per
the documentation for keyctl_read().

We also don't even fill the buffer at all in this case, as this is
slightly easier to implement than doing a short read, and either
behavior appears to be permitted.  It also makes it match the behavior
of the "encrypted" key type.

Fixes: d00a1c72f7f4 ("keys: add new trusted key-type")
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index e20ead4b77a5f73f7a005ffb8039c3a1dc9b4c4a..214ae2dc7f640aad5e0bf88822f4ce23728e1dbf 100644 (file)
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -1094,20 +1094,21 @@ static long trusted_read(const struct key *key, char __user *buffer,
        p = rcu_dereference_key(key);
        if (!p)
                return -EINVAL;
-       if (!buffer || buflen <= 0)
-               return 2 * p->blob_len;
-       ascii_buf = kmalloc(2 * p->blob_len, GFP_KERNEL);
-       if (!ascii_buf)
-               return -ENOMEM;
 
-       bufp = ascii_buf;
-       for (i = 0; i < p->blob_len; i++)
-               bufp = hex_byte_pack(bufp, p->blob[i]);
-       if ((copy_to_user(buffer, ascii_buf, 2 * p->blob_len)) != 0) {
+       if (buffer && buflen >= 2 * p->blob_len) {
+               ascii_buf = kmalloc(2 * p->blob_len, GFP_KERNEL);
+               if (!ascii_buf)
+                       return -ENOMEM;
+
+               bufp = ascii_buf;
+               for (i = 0; i < p->blob_len; i++)
+                       bufp = hex_byte_pack(bufp, p->blob[i]);
+               if (copy_to_user(buffer, ascii_buf, 2 * p->blob_len) != 0) {
+                       kzfree(ascii_buf);
+                       return -EFAULT;
+               }
                kzfree(ascii_buf);
-               return -EFAULT;
        }
-       kzfree(ascii_buf);
        return 2 * p->blob_len;
 }