Kernel: apply security patch for 70 function(by Rgimad). Thanks Dunkaist for the corrections.
git-svn-id: svn://kolibrios.org@9698 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
turbocat
parent
5b5a240f91
commit
dac27e480b
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@ -168,7 +168,7 @@ iglobal
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dd syscall_move_window ; 67-Window move or resize
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dd syscall_move_window ; 67-Window move or resize
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dd f68 ; 68-Some internal services
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dd f68 ; 68-Some internal services
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dd sys_debug_services ; 69-Debug
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dd sys_debug_services ; 69-Debug
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dd file_system_lfn ; 70-Common file system interface, version 2
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dd sys_file_system_lfn ; 70-Common file system interface, version 2
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dd syscall_window_settings ; 71-Window settings
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dd syscall_window_settings ; 71-Window settings
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dd sys_sendwindowmsg ; 72-Send window message
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dd sys_sendwindowmsg ; 72-Send window message
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dd blit_32 ; 73-blitter;
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dd blit_32 ; 73-blitter;
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@ -178,7 +178,7 @@ iglobal
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dd sys_posix ; posix support
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dd sys_posix ; posix support
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dd undefined_syscall ; 78-free
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dd undefined_syscall ; 78-free
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dd undefined_syscall ; 79-free
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dd undefined_syscall ; 79-free
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dd fileSystemUnicode ; 80-File system interface for different encodings
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dd sys_fileSystemUnicode ; 80-File system interface for different encodings
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times 255 - ( ($-servetable2) /4 ) dd undefined_syscall
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times 255 - ( ($-servetable2) /4 ) dd undefined_syscall
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dd sys_end ; -1-end application
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dd sys_end ; -1-end application
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@ -25,102 +25,93 @@ maxPathLength = 1000h
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image_of_eax EQU esp+32
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image_of_eax EQU esp+32
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image_of_ebx EQU esp+20
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image_of_ebx EQU esp+20
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; ; System function 70 security check
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; System function 70 security check
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; align 4
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align 4
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; proc file_system_is_operation_safe stdcall, inf_struct_ptr: dword
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proc file_system_is_operation_safe stdcall, inf_struct_ptr: dword
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; ; in:
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; in:
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; ; inf_struct_ptr = pointer to information structure was given to sysfn70
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; inf_struct_ptr = pointer to information structure was given to sysfn70
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; ; out: ZF = 1 if operation is safe
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; out: ZF = 1 if operation is safe
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; ; ZF = 0 if operation can cause kernel crash
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; ZF = 0 if operation can cause kernel crash
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; push ebx ecx edx
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push ebx ecx edx
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; xor ecx, ecx ; ecx - length of target buffer
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xor ecx, ecx ; ecx - length of target buffer
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; mov ebx, [inf_struct_ptr]
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mov ebx, [inf_struct_ptr]
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; mov edx, [ebx + 16] ; base of target buffer
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mov edx, [ebx + 16] ; base of target buffer
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; cmp dword [ebx], 0 ; if 70.0
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cmp dword [ebx], 0 ; if 70.0
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; jnz .case1
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jnz .case1
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; mov ecx, dword [ebx + 12]
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mov ecx, dword [ebx + 12]
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; jmp .end_switch
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jmp .end_switch
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; .case1:
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.case1:
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; cmp dword [ebx], 1 ; if 70.1
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cmp dword [ebx], 1 ; if 70.1
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; jnz .case2_3
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jnz .case2_3
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; ;mov ecx, 32
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;mov ecx, 32
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; cmp dword [ebx + 8], 1 ; check encoding
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cmp dword [ebx + 8], 1 ; check encoding
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; jbe .case1_304 ; if encdoing <= 1 i.e cpp866
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jbe .case1_304 ; if encdoing <= 1 i.e cpp866
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; mov ecx, 560 ; if unicode then bdvk block len is 560 bytes
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mov ecx, 560 ; if unicode then bdvk block len is 560 bytes
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; jmp .case1_end
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jmp .case1_end
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; .case1_304:
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.case1_304:
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; mov ecx, 304 ; if cp866 then bdvk block len is 304 bytes
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mov ecx, 304 ; if cp866 then bdvk block len is 304 bytes
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; .case1_end:
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.case1_end:
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; imul ecx, dword [ebx + 12] ; multiply bdvk length by their count
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imul ecx, dword [ebx + 12] ; multiply bdvk length by their count
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; add ecx, 32 ; add result header len
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add ecx, 32 ; add result header len
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; jmp .end_switch
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jmp .end_switch
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; .case2_3:
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.case2_3:
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; cmp dword [ebx], 3
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cmp dword [ebx], 3
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; ja .case5 ; if subfn > 3
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ja .case5 ; if subfn > 3
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; mov ecx, dword [ebx + 12]
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mov ecx, dword [ebx + 12]
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; jmp .end_switch
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jmp .end_switch
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; .case5:
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.case5:
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; cmp dword [ebx], 5
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cmp dword [ebx], 5
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; jnz .case6
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jnz .case6
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; mov ecx, 40
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mov ecx, 40
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; jmp .end_switch
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jmp .end_switch
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; .case6:
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.case6:
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; cmp dword [ebx], 6
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cmp dword [ebx], 6
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; jnz .switch_none
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jnz .switch_none
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; mov ecx, 32
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mov ecx, 32
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; jmp .end_switch
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jmp .end_switch
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; .switch_none:
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.switch_none:
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; mov ecx, 1
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cmp ecx, ecx
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; test ecx, ecx
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jmp .ret
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; jmp .ret
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.end_switch:
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; .end_switch:
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stdcall is_region_userspace, edx, ecx
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; ;;
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.ret:
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; stdcall is_region_userspace, edx, ecx
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pop edx ecx ebx
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; .ret:
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ret
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; pop edx ecx ebx
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endp
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; ret
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; endp
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; syscall_fileSystemUnicode: ; with user pointer correctness checking
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sys_fileSystemUnicode: ; with user pointer correctness checking
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; ; in: ebx -> f.80 parameter structure
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; in: ebx -> f.80 parameter structure
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; stdcall file_system_is_operation_safe, ebx
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stdcall file_system_is_operation_safe, ebx
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; jz @f
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jz @f
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; DEBUGF 1, "sysfn80 addr error\n"
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DEBUGF 1, "sysfn80 addr error\n"
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; mov dword [image_of_eax], ERROR_MEMORY_POINTER
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mov dword [image_of_eax], ERROR_MEMORY_POINTER
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; ret
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ret
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; @@:
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@@:
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; jmp fileSystemUnicode
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jmp fileSystemUnicode
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; temporarily commented out cause acpi driver (drivers/devman) uses sysfn70 via 0x40
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;System function 70
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; so because drivers it kernel space, pointer checking fails
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sys_file_system_lfn: ; with user pointer correctness checking
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; TODO solution: add filesystem functions without pointer checking to kernel exports
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; in: ebx -> f.70 parameter structure
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; and make the driver use them, not int 0x40
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stdcall file_system_is_operation_safe, ebx
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; syscall_fileSystemUnicode commented out for the same reason
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jz @f
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; syscall_file_system_lfn: ; with user pointer correctness checking
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; ; in: ebx -> f.70 parameter structure
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; stdcall file_system_is_operation_safe, ebx
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; jz @f
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; DEBUGF 1, "sysfn70 addr error\n"
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DEBUGF 1, "sysfn70 addr error\n"
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; mov dword [image_of_eax], ERROR_MEMORY_POINTER
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mov dword [image_of_eax], ERROR_MEMORY_POINTER
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; ret
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ret
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; @@:
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@@:
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; jmp file_system_lfn
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jmp file_system_lfn
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;file_system_lfn_protected returns values not in registers, but in their images
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; System function 70
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;on stack. Make a short wrapper to actually return values in registers.
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; file_system_lfn_protected returns values not in registers, but in their images
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; on stack. Make a short wrapper to actually return values in registers.
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file_system_lfn_protected_registers:
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file_system_lfn_protected_registers:
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pushad
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pushad
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call file_system_lfn_protected
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call file_system_lfn_protected
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