root r/w permissions - Android Q&A, Help & Troubleshooting

I have an old Xperia (Android 4.4.2) here and I'm having trouble using it as root (SuperSu) I can grant permission to the root applications, but none can read / write permission to / system, so I can not install busybox, Xposed or any other that needs r / w permission, with root explorers the permissions can not be changed. Is there a solution?
Ps:Google Translation.

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EvertonLinyx said:
I have an old Xperia (Android 4.4.2) here and I'm having trouble using it as root (SuperSu) I can grant permission to the root applications, but none can read / write permission to / system, so I can not install busybox, Xposed or any other that needs r / w permission, with root explorers the permissions can not be changed. Is there a solution?
Ps:Google Translation.
Click to expand...
Click to collapse
Install Terminal Emulator app then run following and give output
Code:
mount -o remount,rw /system
and also
Code:
mount | grep " /system "

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HemanthJabalpuri said:
Install Terminal Emulator app then run following and give output
Code:
mount -o remount,rw /system
and also
Code:
mount | grep " /system "
Click to expand...
Click to collapse
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
[email protected]:/ $ su
[email protected]:/ #mount -o remount,rw /system
mount: Operation not permitted
255|[email protected]:/ # su mount -o remount,rw /system
tmp-mksh: remount,rw /system: bad option
1|[email protected]:/ # mount | grep "/system"
/dev/block/platform/msm_sdcc.1/by-name/system /system ext4 ro,seclabel,relatime,data=ordered 0 0
[email protected]:/ #
Click to expand...
Click to collapse

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@osm0sis
Is the above is related to dm-verity?
is there dm-verity in 4.4.2?

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HemanthJabalpuri said:
@osm0sis
Is the above is related to dm-verity?
is there dm-verity in 4.4.2?
Click to expand...
Click to collapse
Nope. That's just not how you use `su`.
To run a command with su the syntax is `su -c`, but for a mount you wouldn't want to do it with su -c because of possible namespace issues. So you need to type `su` be at a root # prompt, then try your mount commands.
Also that's not the best way to pass mount arguments if you want it to work on old toolbox, toybox and/or busybox. They need to be ordered the other way around. You should do `mount -o rw,remount -t auto /system`
Hopefully you can take it from here. My random user help thread support hours are spent for the day.

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@EvertonLinyx
Try this
Code:
su
mount -o rw,remount -t auto /system
and also
Code:
setenforce 0
getenforce
mount -o rw,remount -t auto /system

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HemanthJabalpuri said:
@EvertonLinyx
Try this
Code:
su
mount -o rw,remount -t auto /system
and also
Code:
setenforce 0
getenforce
mount -o rw,remount -t auto /system
Click to expand...
Click to collapse
@HemanthJabalpuri
[email protected] :/ $ su
[email protected]:/ # mount -o rw,remount -t auto /system
mount: Operation not permitted
remount -t auto /system <
tmp-mksh: rw,remount -t auto /system: bad option
1|[email protected]:/ #

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EvertonLinyx said:
and also
@HemanthJabalpuri
[email protected] :/ $ su
[email protected]:/ # mount -o rw,remount -t auto /system
mount: Operation not permitted
remount -t auto /system <
tmp-mksh: rw,remount -t auto /system: bad option
1|[email protected]:/ #
Click to expand...
Click to collapse
Hey,
Also try remaining commands in my above post.

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setenforce is not recognized :s
is there a script or APP that fixes this?

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EvertonLinyx said:
setenforce is not recognized :s
is there a script or APP that fixes this?
Click to expand...
Click to collapse
May be you can get better support at https://forum.xda-developers.com/showthread.php?t=2259645 ....
Post your question there and they will reply.

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Solved
osm0sis said:
Nope. That's just not how you use `su`.
To run a command with su the syntax is `su -c`, but for a mount you wouldn't want to do it with su -c because of possible namespace issues. So you need to type `su` be at a root # prompt, then try your mount commands.
Also that's not the best way to pass mount arguments if you want it to work on old toolbox, toybox and/or busybox. They need to be ordered the other way around. You should do `mount -o rw,remount -t auto /system`
Hopefully you can take it from here. My random user help thread support hours are spent for the day.
Click to expand...
Click to collapse
HemanthJabalpuri said:
May be you can get better support at https://forum.xda-developers.com/showthread.php?t=2259645 ....
Post your question there and they will reply.
Click to expand...
Click to collapse
Finally I solved this and all the other problems in this posthttps://forum.xda-developers.com/xperia-e3/help/root-metods-unlock-bootloader-help-t3943561, thanks for everything