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I'm running a strange 3.0.35 heavily patched kernel on an embedded device (Kobo eReader). Maybe it partly explains this issue.
Basically:

kobo:/$ ssh root@127.0.0.1
socket: Permission denied
ssh: connect to host 127.0.0.1 port 22: failure
kobo:/$ telnet 127.0.0.1
telnet: socket: Permission denied
kobo:/$

Then I can do this without any problem:

kobo:/$ su root
Password:
kobo:/# ssh root@127.0.0.1
root@127.0.0.1's password: 
Welcome to InkBox OS!
* Warning *
Root filesystem is mounted read-only.
Invoke `ifsctl mnt rootfs rw' to make it read-write.
kobo:~#

It seems, according to the stack trace, that AF_INET socket creation as an unpriviledged user is the main hurdle:

socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) = -1 EACCES (Permission denied)

Is there anything I can do to fix it?
Thanks

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2
  • there is an Android patch restricting socket use. Up to you to know if this patch landed on your Kobo (is that its normal kernel anyway?). Name of the option: CONFIG_ANDROID_PARANOID_NETWORK android.googlesource.com/kernel/msm/+/… . See also on SO: stackoverflow.com/questions/36451444/…
    – A.B
    Jun 20 at 8:32
  • Thanks, it's really strange, how could that be enabled on some random device that by default only uses root and is not paranoid about any security at all. But it was...
    – Nicolas Mailloux
    Jun 20 at 15:27

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