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

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