fixed vulnerability (reading kernel memory from userspace) in sysfn 54.2

git-svn-id: svn://kolibrios.org@8711 a494cfbc-eb01-0410-851d-a64ba20cac60
2021-05-09 09:14:43 +00:00 · 2021-05-09 09:14:43 +00:00 · a18d802064
commit a18d802064
parent afb2bbacd5
1 changed files with 9 additions and 0 deletions
--- a/kernel/trunk/core/clipboard.inc
+++ b/kernel/trunk/core/clipboard.inc
@ -49,6 +49,15 @@ align 4
 .2:
        dec     ebx  ; 2 - Write the data to the clipboard
        jnz     .3
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+        stdcall is_region_userspace, edx, ecx
+        jnz     @f
+        mov     eax, -1
+        jmp     .exit_1
+@@:
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
 ; check the lock
        mov     ebx, clipboard_write_lock
        xor     eax, eax