doc: extend installation section for SNOW3G/KASUMI

[dpdk.git] / doc / guides / cryptodevs / snow3g.rst

diff --git a/doc/guides/cryptodevs/snow3g.rst b/doc/guides/cryptodevs/snow3g.rst
index 12b6c4a..41c48d6 100644 (file)
--- a/doc/guides/cryptodevs/snow3g.rst
+++ b/doc/guides/cryptodevs/snow3g.rst
@@ -69,6 +69,17 @@ on their system before building DPDK::
 
    make snow3G
 
+**Note**: When encrypting with SNOW3G UEA2, by default the library
+encrypts blocks of 4 bytes, regardless the number of bytes to
+be encrypted provided (which leads to a possible buffer overflow).
+To avoid this situation, it is necessary not to pass
+3GPP_SAFE_BUFFERS as a compilation flag.
+For this, in the Makefile of the library, make sure that this flag
+is commented out.::
+
+  #EXTRA_CFLAGS  += -D_3GPP_SAFE_BUFFERS
+
+
 Initialization
 --------------