Fixed the EnvP array passed to Proc_StartUser not being NULL terminated

[tpg/acess2.git] / Kernel / arch / x86 / proc.c

diff --git a/Kernel/arch/x86/proc.c b/Kernel/arch/x86/proc.c
index 43a88e3..b6dbfdd 100644 (file)
--- a/Kernel/arch/x86/proc.c
+++ b/Kernel/arch/x86/proc.c
@@ -587,7 +587,6 @@ Uint Proc_MakeUserStack(void)
        return base + USER_STACK_SZ;
 }
 
-
 /**
  * \fn void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize)
  * \brief Starts a user task
@@ -599,19 +598,30 @@ void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **
        Uint    delta;
        Uint16  ss, cs;
        
-       LOG("stack = 0x%x", stack);
+       //Log("stack = %p", stack);
        
        // Copy Arguments
-       stack = (void*)( (Uint)stack - DataSize );
+       stack -= DataSize/sizeof(*stack);
        memcpy( stack, ArgV, DataSize );
        
-       // Adjust Arguments and environment
-       delta = (Uint)stack - (Uint)ArgV;
-       ArgV = (char**)stack;
-       for( i = 0; ArgV[i]; i++ )      ArgV[i] += delta;
-       i ++;
-       EnvP = &ArgV[i];
-       for( i = 0; EnvP[i]; i++ )      EnvP[i] += delta;
+       //Log("stack = %p", stack);
+       
+       if( DataSize )
+       {
+               // Adjust Arguments and environment
+               delta = (Uint)stack - (Uint)ArgV;
+               ArgV = (char**)stack;
+               for( i = 0; ArgV[i]; i++ )
+                       ArgV[i] += delta;
+               i ++;
+               
+               // Do we care about EnvP?
+               if( EnvP ) {
+                       EnvP = &ArgV[i];
+                       for( i = 0; EnvP[i]; i++ )
+                               EnvP[i] += delta;
+               }
+       }
        
        // User Mode Segments
        ss = 0x23;      cs = 0x1B;