Access /dev/fuse without root?

[Paulo Ribeiro]

Hello,

I need to build an app that mounts a remote FileSystem in a local dir. For that I need to use FUSE that come with new android versions(4.x+ i think). I'm compiling libfuse(https://github.com/libfuse/libfuse) with NDK,

if I generate an executable and run it in a shell with root permissions it runs with no problems. 

But I need to make it run without root permissions, so I'm generating a shared lib, but when I call the "munt process" i get and error from the C code: "Permission denied: /dev/fuse" when trying to do a open("/dev/fuse", O_RDWR). 

There is any away to use FUSE without root?? 

Thanks,

Paulo Ribeiro.  

[J Decker]

yes, but you'd have to have root to change the permissions.  (so no)

There ARE some android deployments that allow fuse for users; (since it is for user file systems :) )

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[RC]

hi J Decker,

can you be so kind to point out these deployments that allow fuse without root access change? thanks.

On Wednesday, November 16, 2016 at 3:51:37 AM UTC+8, J Decker wrote:

yes, but you'd have to have root to change the permissions.  (so no)

There ARE some android deployments that allow fuse for users; (since it is for user file systems :) )

On Tue, Nov 15, 2016 at 9:55 AM, Paulo Ribeiro <pauloacr...@gmail.com> wrote:

Hello,

I need to build an app that mounts a remote FileSystem in a local dir. For that I need to use FUSE that come with new android versions(4.x+ i think). I'm compiling libfuse(https://github.com/libfuse/libfuse) with NDK,

if I generate an executable and run it in a shell with root permissions it runs with no problems. 

But I need to make it run without root permissions, so I'm generating a shared lib, but when I call the "munt process" i get and error from the C code: "Permission denied: /dev/fuse" when trying to do a open("/dev/fuse", O_RDWR). 

There is any away to use FUSE without root?? 

Thanks,

Paulo Ribeiro.  

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[Glenn Kasten]

Sorry I'm coming late to this discussion.

This thread has veered a bit off-topic from the main scope of android-ndk,

since it is a generic permission problem that is not related to NDK

(native code does not have any special privileges compared to SDK).

So another group such as android-platform may be more appropriate.

[J Decker]

This says lots about FUSE support.

https://android.googlesource.com/platform/docs/source.android.com/+/jb-mr1-release/src/tech/storage/index.md

I don't recall which device I had that it was enabled, so don't take this as gospel; I tried to find other references but... who'd care to write 'this is a list of devices with user-usable FUSE' ....

Maybe it was my galaxy s3?  Maybe it was an emulator?  Maybe it was my dragon touch tablet?  It is not my LG phone, probably wasn't my samsung phone... but it might have been that tablet, because my initial query found fuse usable.

https://www.quora.com/Does-the-Android-kernel-support-the-FUSE-API-natively

https://guardianproject.info/2012/04/03/transparent-encrypted-virtual-disks-for-android-we-call-it-iocipher/

(uses fuse)... it might require a rooted phone though...

but maybe the system (4.4+) can give you write access to it so you can host a in-process daemon; it DOES work; you just have to write the u+w bit on /dev/fuse

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