diff --git a/src/nzg_allocate.c b/src/nzg_allocate.c
index 7367a20..16d8e7e 100644
--- a/src/nzg_allocate.c
+++ b/src/nzg_allocate.c
@@ -192,11 +192,19 @@ void * msgAllocate(msgSpace *space,
   int bufferFreeSize;
   bufferFreeSize=mSPoolDataTabAddr[selectedPoolIndex].bufferSize;
  printf("BufferSize : %d", bufferFreeSize);
-  resultAddr = mmap( NULL, 
+  
+ // on mappe la totalité du pool
+ resultAddr = mmap( NULL, 
 	  bufferFreeSize, 
 	  PROT_READ | PROT_WRITE,
 	  MAP_SHARED, mSPoolFd,
-	  (off_t)0); // bufferFreeSize*bufferFreeIndex );
+	  (off_t)0); 
+ int bufferNb=mSPoolDataTabAddr[selectedPoolIndex].bufferNb;
+ 
+ mprotect(resultAddr,bufferFreeSize*bufferNb,PROT_NONE);
+ mprotect(resultAddr,bufferFreeSize*(bufferFreeIndex+1),PROT_READ|PROT_WRITE);
+
+  //(bufferFreeSize*bufferFreeIndex) );
   if( resultAddr == MAP_FAILED) {
 	NZG_ERROR("resultAddr mmap","");
 	goto ERROR;
diff --git a/src/nzg_bufferDetachProc.c b/src/nzg_bufferDetachProc.c
index 8ec4949..2572eed 100644
--- a/src/nzg_bufferDetachProc.c
+++ b/src/nzg_bufferDetachProc.c
@@ -11,6 +11,7 @@ int msgBufferDetachProc(
   msgBufferInfo * bufferInfoTabAddr;
   int bufferInfoNb;  
 
+  printf("Detaching %d,%d\n",poolIndex,bufferIndex);
   //récuperer l'ID du BufferInfoTab;
   strcpy(bufferInfoTabId, poolDataTabAddr[poolIndex].bufferInfoTabId);
 
@@ -23,7 +24,7 @@ int msgBufferDetachProc(
   /** on regarde dans le tableau d'infos de buffer **/
   bufferInfoNb=poolDataTabAddr[poolIndex].bufferNb;
   bufferInfoTabAddr=mmap(NULL,bufferInfoNb*sizeof(msgBufferInfo),
-	  PROT_READ,MAP_SHARED,bufferInfoTabFd,(off_t)0);
+	  PROT_READ|PROT_WRITE,MAP_SHARED,bufferInfoTabFd,(off_t)0);
 
   bufferInfoTabAddr[bufferIndex].ownerPid = (pid_t)-1;
   bufferInfoTabAddr[bufferIndex].addr = NULL;
diff --git a/src/nzg_free.c b/src/nzg_free.c
index e58eb2b..ae51825 100644
--- a/src/nzg_free.c
+++ b/src/nzg_free.c
@@ -1,7 +1,7 @@
 #include "libnazgul.h"
 
 int msgFree(msgSpace * space, void * addr){
-  printf("Freeee de :0x%08x\n",(int)addr);
+  printf("[ FREE 0x%08x ]\n",(int)addr);
 
   int poolIndex;
   int bufferIndex;
@@ -59,8 +59,7 @@ sem_t * poolDataTabSemFd;
 
   printf("Found : %d\n",err);
   printf("Freing pool: %d, buffer: %d\n",poolIndex,bufferIndex);
-  //msgBufferDetachProc(poolDataTabAddr,poolIndex,bufferIndex,addr);
-  printf("FREE-SEMWAIT\n");
+  msgBufferDetachProc(poolDataTabAddr,poolIndex,bufferIndex,addr);
 
   /* unmapper le msgPoolDataTab */
   munmap(poolDataTabAddr,(space->poolNb) * sizeof( msgPoolData ));