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kernel: Check for base+len overflow in is_region_userspace

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git-svn-id: svn://kolibrios.org@9045 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Ivan Baravy 2021-07-09 09:22:44 +00:00
parent 34a4c12412
commit b6f769987c
7 changed files with 32 additions and 35 deletions
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2
kernel/trunk/blkdev/disk.inc
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@ -1310,7 +1310,7 @@ proc default_fs_get_file_info uses edi
mov ebx, [ebx+f70s5arg.buf]
stdcall is_region_userspace, ebx, ecx
movi eax, ERROR_MEMORY_POINTER
jz .done
jnz .done
mov edi, ebx
xor eax, eax
rep stosb

2
kernel/trunk/core/clipboard.inc
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@ -52,7 +52,7 @@ align 4
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
stdcall is_region_userspace, edx, ecx
jnz @f
jz @f
mov eax, -1
jmp .exit_1
@@:

4
kernel/trunk/core/taskman.inc
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@ -812,7 +812,7 @@ common_app_entry:
test edi, edi
jz @f
stdcall is_region_userspace, edi, [ebp+APP_HDR.filename_size]
jz @f
jnz @f
mov al, '/'
stosb
rep movsb
@ -840,7 +840,7 @@ common_app_entry:
.copy_cmdline:
inc ecx ; keep in mind about 0 in the end
stdcall is_region_userspace, edi, ecx
jz .check_tls_header
jnz .check_tls_header
dec ecx
rep movsb
mov byte [edi], 0

6
kernel/trunk/fs/fs_lfn.inc
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@ -92,7 +92,7 @@ image_of_ebx EQU esp+20
; syscall_fileSystemUnicode: ; with user pointer correctness checking
; ; in: ebx -> f.80 parameter structure
; stdcall file_system_is_operation_safe, ebx
; jnz @f
; jz @f
; DEBUGF 1, "sysfn80 addr error\n"
; mov dword [image_of_eax], ERROR_MEMORY_POINTER
@ -108,7 +108,7 @@ image_of_ebx EQU esp+20
; syscall_file_system_lfn: ; with user pointer correctness checking
; ; in: ebx -> f.70 parameter structure
; stdcall file_system_is_operation_safe, ebx
; jnz @f
; jz @f
; DEBUGF 1, "sysfn70 addr error\n"
; mov dword [image_of_eax], ERROR_MEMORY_POINTER
@ -550,7 +550,7 @@ sys_current_directory: ; sysfunction 30
.get:
; in: ecx -> buffer, edx = length, eax = encoding
stdcall is_region_userspace, ecx, edx
jnz @f
jz @f
; if illegal buffer given
xor edx, edx

4
kernel/trunk/gui/window.inc
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@ -130,7 +130,7 @@ dd .setSkinUnicode
mov edx, 192 ; max size
@@:
stdcall is_region_userspace, esi, edx ;
jnz @f ;
jz @f ;
ret ;
@@:
mov edi, common_colours
@ -147,7 +147,7 @@ dd .setSkinUnicode
mov edx, 192 ; max size
@@:
stdcall is_region_userspace, edi, edx
jnz @f
jz @f
ret
@@:
mov esi, common_colours

47
kernel/trunk/kernel.asm
View File

@ -1419,13 +1419,13 @@ display_number:
test bl, bl
jz @f
stdcall is_region_userspace, ecx, 1
jnz @f
jz @f
ret
@@:
test esi, 0x08000000
jz @f
stdcall is_region_userspace, edi, 1
jnz @f
jz @f
ret
@@:
;It is not optimization
@ -1767,7 +1767,7 @@ sys_getsetup:
; if given memory address belongs to kernel then error
stdcall is_region_userspace, ebx, 128
jz .addr_error
jnz .addr_error
mov eax, keymap
mov ecx, 128
@ -1780,7 +1780,7 @@ sys_getsetup:
jnz .alt
stdcall is_region_userspace, ebx, 128
jz .addr_error
jnz .addr_error
mov eax, keymap_shift
mov ecx, 128
@ -1793,7 +1793,7 @@ sys_getsetup:
jne .country
stdcall is_region_userspace, ebx, 128
jz .addr_error
jnz .addr_error
mov eax, keymap_alt
mov ecx, 128
@ -2459,7 +2459,7 @@ sysfn_getdiskinfo: ; 18.11 = get disk info table
jnz .exit
.small_table:
stdcall is_region_userspace, edx, DRIVE_DATA_SIZE
jz .exit
jnz .exit
mov edi, edx
mov esi, DRIVE_DATA
mov ecx, DRIVE_DATA_SIZE ;10
@ -2475,7 +2475,7 @@ sysfn_lastkey: ; 18.12 = return 0 (backward compatibility)
sysfn_getversion: ; 18.13 = get kernel ID and version
; if given memory address belongs to kernel then error
stdcall is_region_userspace, ecx, version_end-version_inf
jz .addr_error
jnz .addr_error
mov edi, ecx
mov esi, version_inf
@ -2838,7 +2838,7 @@ nosb4:
; add check pointer
stdcall is_region_userspace, ecx, esi
jz .fin
jnz .fin
cmp [img_background], static_background_data
jnz @f
@ -3191,7 +3191,7 @@ sys_cpuusage:
;
; if given memory address belongs to kernel then error
stdcall is_region_userspace, ebx, 0x4C
jz .addr_error
jnz .addr_error
cmp ecx, -1 ; who am I ?
jne .no_who_am_i
@ -4401,7 +4401,7 @@ syscall_putimage: ; PutImage
lea eax, [eax*3]
stdcall is_region_userspace, ebx, eax
pop ecx
jz sys_putimage.exit
jnz sys_putimage.exit
sys_putimage:
test ecx, 0x80008000
@ -4451,7 +4451,7 @@ sys_putimage_palette:
imul eax, ecx
stdcall is_region_userspace, ebx, eax
pop ecx
jz sys_putimage.exit
jnz sys_putimage.exit
mov eax, [current_slot_idx]
shl eax, 8
@ -5206,7 +5206,7 @@ align 4
syscall_writetext: ; WriteText
stdcall is_region_userspace, edx, esi
jz .err
jnz .err
mov eax, [TASK_BASE]
mov ebp, [eax-twdw+WDATA.box.left]
@ -5230,7 +5230,7 @@ align 4
@@: ; check pointer
stdcall is_region_userspace, edi, 0
jz .err
jnz .err
jmp dtext
.err:
ret
@ -5403,7 +5403,7 @@ syscall_getarea:
lea ebp, [ebp*3]
imul ebp, esi
stdcall is_region_userspace, edi, ebp
jz .exit
jnz .exit
mov ebp, edx
dec ebp
@ -5474,7 +5474,7 @@ syscall_putarea_backgr:
lea ebp, [ebp*4]
imul ebp, esi
stdcall is_region_userspace, edi, ebp
jz .exit
jnz .exit
mov ebp, edx
@ -5754,23 +5754,20 @@ align 4
; @return ZF = 1 if region in userspace memory,
; ZF = 0 otherwise
proc is_region_userspace stdcall, base:dword, len:dword
push eax ebx
push eax
mov eax, [base]
cmp eax, OS_BASE
ja @f
cmp eax, OS_BASE-1
ja @f ; zf
add eax, [len]
jc @f ; zf
cmp eax, OS_BASE
ja @f
ja @f ; zf
mov eax, 1
jmp .ret
cmp eax, eax ; ZF
@@:
xor eax, eax
.ret:
test eax, eax
pop ebx eax
pop eax
ret
endp

2
kernel/trunk/network/stack.inc
View File

@ -830,7 +830,7 @@ sys_network:
.get_dev_name:
mov ebx, eax
stdcall is_region_userspace, ecx, 64
jz .bad_buffer
jnz .bad_buffer
mov esi, [ebx + NET_DEVICE.name]
mov edi, ecx