# Cannot read file after WP change

**URL:** <https://forum.legato.io/t/cannot-read-file-after-wp-change/5588>\
**Category:** Legato Application Framework\
**Created:** [January 28, 2021, 10:40am UTC](https://forum.legato.io/t/cannot-read-file-after-wp-change/5588 "2021-01-28T10:40:25Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\
**Post date:** [January 28, 2021, 11:58am UTC](https://forum.legato.io/t/cannot-read-file-after-wp-change/5588/2 "2021-01-28T11:58:38Z")

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You can see this

> [@Opening Files in Sandboxed App](https://forum.legato.io/t/opening-files-in-sandboxed-app/5525/4):
>
> I don’t see problem with WP76 R13. You can use my app attached. root@swi-mdm9x28-wp:/tmp# cd /tmp root@swi-mdm9x28-wp:/tmp# root@swi-mdm9x28-wp:/tmp# echo hello\_everybody \> hello.txt root@swi-mdm9x28-wp:/tmp# root@swi-mdm9x28-wp:/tmp# chmod o+w hello.txt root@swi-mdm9x28-wp:/tmp# root@swi-mdm9x28-wp:/tmp# xattr set ‘security.SMACK64’ ‘app.hello7rwx’ hello.txt root@swi-mdm9x28-wp:/tmp# root@swi-mdm9x28-wp:/tmp# xattr get hello.txt name=security.SMACK64; value=app.hello7rwx root@swi-md…

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