firewire: core: allocate the low memory region

Prevent userspace applications from allocating low memory address
ranges.  Otherwise, if some application happens to allocate such
a range and intends for a remote node to access it, and if that node
also implements SBP-2 (which will become more likely with the upcoming
SBP-2 target support), these accesses would be routed by the physical
DMA unit to some wrong memory address.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 21 insertions, 2 deletions

diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index 1c4980c32f90..fc2ad654e1ad 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -525,9 +525,10 @@ const struct fw_address_region fw_high_memory_region =
         { .start = 0x000100000000ULL, .end = 0xffffe0000000ULL,  };
 EXPORT_SYMBOL(fw_high_memory_region);
 
-#if 0
-const struct fw_address_region fw_low_memory_region =
+static const struct fw_address_region low_memory_region =
         { .start = 0x000000000000ULL, .end = 0x000100000000ULL,  };
+
+#if 0
 const struct fw_address_region fw_private_region =
         { .start = 0xffffe0000000ULL, .end = 0xfffff0000000ULL,  };
 const struct fw_address_region fw_csr_region =
@@ -1189,6 +1190,23 @@ static struct fw_address_handler registers = {
         .address_callback       = handle_registers,
 };
 
+static void handle_low_memory(struct fw_card *card, struct fw_request *request,
+                int tcode, int destination, int source, int generation,
+                unsigned long long offset, void *payload, size_t length,
+                void *callback_data)
+{
+        /*
+         * This catches requests not handled by the physical DMA unit,
+         * i.e., wrong transaction types or unauthorized source nodes.
+         */
+        fw_send_response(card, request, RCODE_TYPE_ERROR);
+}
+
+static struct fw_address_handler low_memory = {
+        .length                 = 0x000100000000ULL,
+        .address_callback       = handle_low_memory,
+};
+
 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
 MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
 MODULE_LICENSE("GPL");
@@ -1250,6 +1268,7 @@ static int __init fw_core_init(void)
 
         fw_core_add_address_handler(&topology_map, &topology_map_region);
         fw_core_add_address_handler(&registers, &registers_region);
+        fw_core_add_address_handler(&low_memory, &low_memory_region);
         fw_core_add_descriptor(&vendor_id_descriptor);
         fw_core_add_descriptor(&model_id_descriptor);