fix: align POSIX stdio and argument handling, clarify Intel iwlwifi licensing

kernel/src/Ipc/Ipc.cpp

@@ -714,8 +714,17 @@ namespace Ipc {
         g_handleTableLocks[slot].Acquire();
         uint64_t& bm0 = g_handleBitmaps[slot][0];
         uint64_t& bm1 = g_handleBitmaps[slot][1];
-        // Find first zero bit in bitmap (free slot)
-        uint64_t bits0 = ~bm0;
+        // Find first zero bit in bitmap (free slot).
+        //
+        // Handles 0, 1 and 2 are never allocated: to POSIX code those numbers
+        // ARE stdin/stdout/stderr, and the libc routes read()/write() on them
+        // to the terminal (SYS_GETCHAR/SYS_PUTCHAR) rather than to this table.
+        // Handing them out as file handles makes the two meanings collide --
+        // a program's third open() would own "stderr", and every write(2, ...)
+        // it made would land in that file instead of on screen. Reserving them
+        // here rather than at process setup keeps the rule in one place and
+        // immune to a stale bitmap.
+        uint64_t bits0 = ~bm0 & ~0x7ULL;
         uint64_t bits1 = ~bm1;
         if (bits0) {
             int i = __builtin_ctzll(bits0);