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I am trying to run an executable from the android terminal with root permissions, but I am constantly receiving the following error:

[ExecutableName] : permission denied

I am confirmed to be loged in as root. I see the # sign before my prompt and I can run root commands such as chmod. I saw that the android shell guide says

"The built-in shell has very limited error handling. When you type a command name >incorrectly it will say "permission denied", even though the real problem is that it >couldn't find the command:"

Does anyone know how to get more information on this "permission denied" error?

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Can you run ls -l from the directory the executable is in and post that? – eldarerathis♦ Dec 11 '11 at 17:23
Here is what I ran, I just really want more info on what happens when i run it. ---xrwxr-x 1 system sdcard_r 76 Oct 3 2007 doukutsu – Bubbleware Technology Dec 11 '11 at 18:26
2  
Hm, the sdcard_r is interesting. Is the binary on your SD card? I know some devices (but possibly not all) simply won't let you run an executable if it's on the external storage. You could try moving it to /data/local or somewhere similar and see if that helps. I don't know that there's a way to simply get more info from the shell as to why you're getting permission denied, though. – eldarerathis♦ Dec 11 '11 at 18:48
Do you have SuperUser installed? What does the log say? – Matthew Read♦ Dec 11 '11 at 19:08
@MatthewRead It says "terminal emulator allowed" – Bubbleware Technology Dec 11 '11 at 21:08
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1 Answer

up vote 3 down vote

As eldarerathis already mentioned: On many (if not most) devices supporting an SD card, this card is mounted with the noexec option -- which means as the name suggests: "no exec from here", i.e. you cannot execute anything from the sdcard.

Again, one solution was already mentioned by eldarerathis: Try a different storage. You've got the power, your device is rooted.

A second approach would be to re-mount the sdcard without the noexec option. But there's a good reason why noexec is used here; it at least offers an additional level of security. So before using this approach, you should research a bit whether it might trigger unwanted side-effects.

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+1 from me - that's the sole reason why SDcards have the executable bit blocked at the filesystem level, to prevent malicious apps wreaking havoc from another place outside of the ROM i.e. SDcard! – t0mm13b Aug 7 '12 at 14:57

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