fix bug http://bugs.kolibrios.org/view.php?id=145 in sf 4

git-svn-id: svn://kolibrios.org@9222 a494cfbc-eb01-0410-851d-a64ba20cac60
2021-10-23 15:53:35 +00:00 · 2021-10-23 15:53:35 +00:00 · bb36197cd2
commit bb36197cd2
parent 83176ac8ef
1 changed files with 6 additions and 0 deletions
--- a/kernel/trunk/kernel.asm
+++ b/kernel/trunk/kernel.asm
@ -5212,8 +5212,14 @@ align 4

 syscall_writetext:                      ; WriteText

+        push    esi    ;check pointer on kernel address.
+        test    ecx, 0x80000000
+        jz      @f
+        mov     esi, 0
+@@:
        stdcall is_region_userspace, edx, esi
        jnz     .err
+        pop     esi

        mov     eax, [TASK_BASE]
        mov     ebp, [eax-twdw+WDATA.box.left]