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I have my chroot environment setup (Alpine Linux) in /sdcard/alpine. I try running my chroot with the following commands:

su
chroot alpine /bin/busybox

(busybox is the cli of Alpine)

I get the following error: 

chroot: exec /bin/busybox: Permission denied.

How can I fix this?

My device specs:

Google Pixel XL (marlin)

Android 9.0

Rooted (obviously) with Magisk

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Binaries can't be executed on /sdcard because it's an emulated filesystem with fixed file permissions, mounted with noexec mount option. Create alpine directory on some other filesystem e.g. /data:

~# mkdir -p /data/local/tmp/alpine/bin

Place your executable in newly created directory and do chroot:

~# cd /data/local/tmp
~# chmod 0755 alpine/bin/busybox
~# chroot alpine /bin/busybox sh

This will drop you to a root shell (UID 0) with changed root (/).

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  • Since e.g. Termux is an app, and apps' data live under /data, the OP might be able to perform the whole procedure there.
    – Grimoire
    Sep 25, 2019 at 0:56
  • @DeathMaskSalesman right
    – Irfan Latif
    Sep 25, 2019 at 9:52

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