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kernel, sf9: zero data buffer for empty slots 

Now sf9 doesn't read uninitialized memory when called for an empty slot.
Also, applications don't get stale data after sf9 anymore.

git-svn-id: svn://kolibrios.org@9968 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Ivan Baravy 2024-01-16 02:44:48 +00:00
parent 7b51a89852
commit bd4ac33731
2 changed files with 62 additions and 39 deletions
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2
kernel/trunk/const.inc
View File

@ -612,7 +612,7 @@ struct WDATA
draw_bgr_x dd ?
draw_bgr_y dd ?
draw_data RECT
thread dd ? ; prt APPDATA
thread dd ? ; ptr APPDATA
rb 12
ends

99
kernel/trunk/kernel.asm
View File

@ -115,9 +115,9 @@ B32:
cld
rep stosd
; CLEAR KERNEL UNDEFINED GLOBALS
; Clear kernel undefined globals and slots
mov edi, endofcode - OS_BASE
mov ecx, 0x90000
mov ecx, VGABasePtr - endofcode ; why uglobals_size isn't enough?
sub ecx, edi
shr ecx, 2
rep stosd
@ -219,8 +219,8 @@ high_code:
mov [pte_valid_mask], ebx
xor eax, eax
mov dword [sys_proc + PROC.pdt_0], eax
mov dword [sys_proc + PROC.pdt_0+4], eax
mov [sys_proc + PROC.pdt_0], eax
mov [sys_proc + PROC.pdt_0+4], eax
mov eax, cr3
mov cr3, eax ; flush TLB
@ -524,6 +524,16 @@ high_code:
mov [current_process], sys_proc
; set all the threads state to free
mov edi, SLOT_BASE
movi eax, TSTATE_FREE
movi ecx, max_processes
@@:
mov [edi+APPDATA.state], TSTATE_FREE
add edi, sizeof.APPDATA
dec ecx
jns @b
mov edx, SLOT_BASE + sizeof.APPDATA*1
mov ebx, [os_stack_seg]
add ebx, RING0_STACK_SIZE
@ -543,9 +553,9 @@ high_code:
xor ecx, ecx
call scheduler_add_thread
mov dword [current_slot_idx], 2
mov [current_slot_idx], 2
mov [thread_count], 2
mov dword [current_slot], SLOT_BASE + sizeof.APPDATA*2
mov [current_slot], SLOT_BASE + sizeof.APPDATA*2
; Move other CPUs to deep sleep, if it is useful
uglobal
@ -1071,12 +1081,12 @@ proc setup_os_slot
inc eax
mov [edx + APPDATA.io_map + 4], eax
mov dword [edx + APPDATA.pl0_stack], ebx
mov [edx + APPDATA.pl0_stack], ebx
lea edi, [ebx + RING0_STACK_SIZE]
mov dword [edx + APPDATA.fpu_state], edi
mov dword [edx + APPDATA.saved_esp0], edi
mov dword [edx + APPDATA.saved_esp], edi
mov dword [edx + APPDATA.terminate_protection], 1 ; make unkillable
mov [edx + APPDATA.fpu_state], edi
mov [edx + APPDATA.saved_esp0], edi
mov [edx + APPDATA.saved_esp], edi
mov [edx + APPDATA.terminate_protection], 1 ; make unkillable
mov esi, fpu_data
mov ecx, [xsave_area_size]
@ -1085,14 +1095,14 @@ proc setup_os_slot
rep movsd
lea eax, [edx + APP_EV_OFFSET]
mov dword [edx + APPDATA.fd_ev], eax
mov dword [edx + APPDATA.bk_ev], eax
mov [edx + APPDATA.fd_ev], eax
mov [edx + APPDATA.bk_ev], eax
lea eax, [edx + APP_OBJ_OFFSET]
mov dword [edx + APPDATA.fd_obj], eax
mov dword [edx + APPDATA.bk_obj], eax
mov [edx + APPDATA.fd_obj], eax
mov [edx + APPDATA.bk_obj], eax
mov dword [edx + APPDATA.cur_dir], sysdir_path-2
mov [edx + APPDATA.cur_dir], sysdir_path-2
mov [edx + APPDATA.process], sys_proc
@ -1514,7 +1524,7 @@ sys_setup:
; 11 = enable lba read
; 12 = enable pci access
;-----------------------------------------------------------------------------
and [esp + SYSCALL_STACK.eax], dword 0
and [esp + SYSCALL_STACK.eax], 0
; F.21.1 - set MPU MIDI base port
dec ebx
jnz @f
@ -1601,7 +1611,7 @@ sys_setup:
ret
;--------------------------------------
.error:
or [esp + SYSCALL_STACK.eax], dword -1
or [esp + SYSCALL_STACK.eax], -1
ret
;-----------------------------------------------------------------------------
align 4
@ -1675,7 +1685,7 @@ sys_getsetup:
ret
.addr_error: ; if given memory address is illegal
or dword [esp + SYSCALL_STACK.eax], -1
or [esp + SYSCALL_STACK.eax], -1
ret
;--------------------------------------
@@:
@ -1725,7 +1735,7 @@ sys_getsetup:
ret
;--------------------------------------
.error:
or [esp + SYSCALL_STACK.eax], dword -1
or [esp + SYSCALL_STACK.eax], -1
ret
;-----------------------------------------------------------------------------
get_timer_ticks:
@ -1930,7 +1940,7 @@ sysfn_shutdown: ; 18.9 = system shutdown
mov [SYS_SHUTDOWN], al
mov [shutdown_processes], eax
call wakeup_osloop
and dword [esp + SYSCALL_STACK.eax], 0
and [esp + SYSCALL_STACK.eax], 0
.exit_for_anyone:
ret
uglobal
@ -2013,11 +2023,11 @@ sysfn_terminate2:
call sysfn_terminate
call unlock_application_table
sti
and dword [esp + SYSCALL_STACK.eax], 0
and [esp + SYSCALL_STACK.eax], 0
ret
.not_found:
call unlock_application_table
or dword [esp + SYSCALL_STACK.eax], -1
or [esp + SYSCALL_STACK.eax], -1
ret
;------------------------------------------------------------------------------
sysfn_deactivate: ; 18.1 = DEACTIVATE WINDOW
@ -2213,7 +2223,7 @@ sysfn_getversion: ; 18.13 = get kernel ID and version
rep movsb
ret
.addr_error: ; if given memory address is illegal
mov dword [esp + SYSCALL_STACK.eax], -1
mov [esp + SYSCALL_STACK.eax], -1
ret
;------------------------------------------------------------------------------
sysfn_waitretrace: ; 18.14 = sys wait retrace
@ -2223,7 +2233,7 @@ sysfn_waitretrace: ; 18.14 = sys wait retrace
in al, dx
test al, 1000b
jz .loop
and [esp + SYSCALL_STACK.eax], dword 0
and [esp + SYSCALL_STACK.eax], 0
ret
;------------------------------------------------------------------------------
align 4
@ -2406,7 +2416,7 @@ sys_cachetodiskette:
mov [esp + SYSCALL_STACK.eax], eax
ret
.no_floppy_save:
mov [esp + SYSCALL_STACK.eax], dword 1
mov [esp + SYSCALL_STACK.eax], 1
ret
;------------------------------------------------------------------------------
align 4
@ -2421,12 +2431,24 @@ sys_cpuusage:
cmp ecx, -1 ; who am I ?
jne .no_who_am_i
mov ecx, [current_slot_idx]
.no_who_am_i:
.no_who_am_i:
jecxz .empty_slot
cmp ecx, max_processes
ja .nofillbuf
test ecx, ecx ; slot 0 is empty, kernel threads start from 1
jz .nofillbuf
ja .empty_slot
mov edx, ecx
shl edx, BSF sizeof.APPDATA
cmp [SLOT_BASE+edx+APPDATA.state], TSTATE_FREE
jnz .thread_found
.empty_slot:
; zero buffer for an empty slot
push edi
xor eax, eax
mov edi, ebx
movi ecx, sizeof.process_information
rep stosb
pop edi
jmp .nofillbuf
.thread_found:
; +4: word: position of the window of thread in the window stack
mov ax, [WIN_STACK + ecx * 2]
mov [ebx+process_information.window_stack_position], ax
@ -2494,11 +2516,11 @@ sys_cpuusage:
stosb
; Event mask (+71)
mov eax, dword [SLOT_BASE + ecx + APPDATA.event_mask]
mov eax, [SLOT_BASE + ecx + APPDATA.event_mask]
stosd
; Keyboard mode (+75)
mov al, byte [SLOT_BASE + ecx + APPDATA.keyboard_mode]
mov al, [SLOT_BASE + ecx + APPDATA.keyboard_mode]
stosb
pop esi
@ -2512,7 +2534,7 @@ sys_cpuusage:
ret
.addr_error: ; if given memory address is illegal
mov dword [esp + SYSCALL_STACK.eax], -1
mov [esp + SYSCALL_STACK.eax], -1
ret
@ -3461,7 +3483,7 @@ r_f_port_area:
;-----------------------------------------------------------------------------
align 4
drawbackground:
cmp [BgrDrawMode], dword 1
cmp [BgrDrawMode], 1
jne .bgrstr
call vesa20_drawbackground_tiled
call __sys_draw_pointer
@ -4055,7 +4077,7 @@ sys_gs: ; direct screen access
ja .not_support
jmp dword [f61call + ebx*4]
.not_support:
or [esp + SYSCALL_STACK.eax], dword -1
or [esp + SYSCALL_STACK.eax], -1
ret
@ -4380,7 +4402,8 @@ sys_apm:
inc eax
or dword [esp + 44], eax ; error
add eax, 7
mov dword [esp + SYSCALL_STACK.eax], eax ; 32-bit protected-mode interface not supported
mov [esp + SYSCALL_STACK.eax], eax ; 32-bit protected-mode
; interface not supported
ret
@@:
@ -4426,7 +4449,7 @@ sys_apm:
align 4
undefined_syscall: ; Undefined system call
mov [esp + SYSCALL_STACK.eax], dword -1
mov [esp + SYSCALL_STACK.eax], -1
ret
align 4