[linux] how to arrange for the arguments ioctl?

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sergo_mat

Joined: 12 Nov 2015
Posts: 7

sergo_mat 12 Nov 2015, 11:00

Please help me figure out how to make a call ioctl EVIOCGKEY

Code:

start_key:
     stmfd   sp!, {r1-r2, r7, lr}

    mov     r7, toch_desc
    ldr     r0, [r7]
    imm32 r1,  EVIOCGKEY
    imm32 r2,  newt
    mov r7,  sys_ioctl
    swi     0
    ldmfd   sp!, {r1-r2, r7, pc}    ; return 

 EVIOCGKEY =  0x4518


 newt:
      dw 256 dup(?)

edit by revolution: Added code tags

12 Nov 2015, 11:00

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20761
Location: In your JS exploiting you and your system

revolution 12 Nov 2015, 11:41

sergo_mat: To load arbitrary constants you need to do it in more than one instruction, or use a LDR instruction and load from memory. To access memory pointers close to the code you can use ADR.

Code:

EVIOCGKEY       = 0x4518
toch_desc       = 0x12345678
sys_ioctl       = 0x87654321

start_key:
        stmfd   sp!,{r1-r2,r7,lr}
        ldr     r7,[constant_toch_desc]
        ldr     r0,[r7]
        ldr     r1,[constant_EVIOCGKEY]
        adr     r2,newt
        ldr     r7,[constant_sys_ioctl]
        swi     0
        ldmfd   sp!,{r1-r2,r7,pc}       ;return

constant_EVIOCGKEY:     dw      EVIOCGKEY
constant_toch_desc:     dw      toch_desc
constant_sys_ioctl:     dw      sys_ioctl

newt:           dw      256 dup(?)

12 Nov 2015, 11:41

sergo_mat

Joined: 12 Nov 2015
Posts: 7

sergo_mat 12 Nov 2015, 11:56

Thank you but the question is that how to arrange for the arguments ioctl
to get data from the touchscreen
/dev/input/event0

12 Nov 2015, 11:56

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20761
Location: In your JS exploiting you and your system

revolution 12 Nov 2015, 12:09

sergo_mat: Your question appears to be related to your OS. Which OS are you using?

12 Nov 2015, 12:09

sergo_mat

Joined: 12 Nov 2015
Posts: 7

sergo_mat 12 Nov 2015, 12:12

Linux

12 Nov 2015, 12:12

sergo_mat

Joined: 12 Nov 2015
Posts: 7

sergo_mat 12 Nov 2015, 12:14

I have successfully open /dev/input/event0 and get fd

12 Nov 2015, 12:14

sergo_mat

Joined: 12 Nov 2015
Posts: 7

sergo_mat 12 Nov 2015, 12:18

Next, we need to use the argument ioctl EVIOCGKEY and then there is a problem ioctl returns an error FFFFFFEA

12 Nov 2015, 12:18

Picnic

Joined: 05 May 2007
Posts: 1439
Location: Piraeus, Greece

Picnic 23 Feb 2016, 09:16

sergo_mat are you trying to get the coordinates of touchscreen?
If you did, can you provide an arm code sample (or give a few more information on how).

23 Feb 2016, 09:16

sergo_mat

Joined: 12 Nov 2015
Posts: 7

sergo_mat 20 Jun 2016, 13:34

You can obtain the coordinates tochskreen well as keystrokes but you need to read the size of the virtual file to find out whether or not it was touch

20 Jun 2016, 13:34

sergo_mat

Joined: 12 Nov 2015
Posts: 7

sergo_mat 07 Feb 2021, 09:05

Help, can anyone come across trying to output sound through db "/ dev / snd / pcmC0D0p", 0 when opening decryptor = 3 but I can not write the structure using SNDRV_PCM_IOCTL_HW_PARAMS = _IOWR ('A', 0x11, struct sndrv_pcm4_hw_params

SNDRV_PCM_IOCTL_HW_PARAMS =0xc25c4111

FFFFFFE7-ANSWER

07 Feb 2021, 09:05

Melissa

Joined: 12 Apr 2012
Posts: 125

Melissa 27 Sep 2021, 13:56

take a look at source code of driver, and modify as needed

27 Sep 2021, 13:56

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