[EXE] Static Linux binaries for ARM/Android (Cryptsetup, EncFS, F2FS-Tools, Testdisk, PhotoRec,..)

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DualJoe

Senior Member
Oct 12, 2011
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Native ARM/static Linux binaries
(for all ARMv7+ compatible platforms)


Open-source Linux binaries that are either not available on Android (e.g. in Termux)
or make sense to be statically compiled (e.g. to run in TWRP/recovery for data recovery).

These are root tools and might damage your device severely. Use at your own risk. I take no responsibility whatsoever. If in doubt don't use them.

Minimum CPU: ARMv7/vfpv3-d16. Compiled against musl-libc/Android Kernel 3.4. Binaries are static, bionic/libc independent and should run on Android, TWRP, emulator or any other compatible ARM device. Musl is patched (info)(info2)(patch file: patch -p0 -u -b -i musl-android-smp.patch) to iterate CPU cores by /proc/stat instead of _SC_NPROCESSORS_CONF/sched_getaffinity to prevent false detection due to ARM cpu core powersaving (permanently turning cores on/off). This should report CPU cores more reliably to multithreading apps.

Example instructions how to build EncFS can be found here.
Some Cryptsetup compile recipes are here.

Changelog:
20190923 - f2fs-tools added
20190915 - dislocker, ntfs-3g, mount.exfat-fuse added
20190910 - VeraCrypt v1.24-b5 added
20191215 - musl smp patch added
20191224 - hstr v2.2.0 updated
20191225 - Testdisk, PhotoRec v7.2-wip-dec2019 updated
20200103 - tar v1.32 updated (with selinux, acl, xattr support)
20200513 - Cryptsetup v2.3.2 added
20200518 - fscrypt 0.2.7, strace56(aarch64) added
20200525 - p7zip v17.01 added
20200603 - parted v3.3 added
20200606 - fxz v1.1.0alpha added
20201212 - ddrescue v1.25 added
20201212 - Cryptsetup v2.3.4 updated
20210113 - f2fs-tools updated to v1.14.0
20210125 - Several tools compiled by @Borovets. See 'Misc' tools.
20210413 - Cryptsetup v2.3.5 updated
20210916 - Cryptsetup v2.4.1 updated. Thx to @misterhsp.
20211108 - rsync v3.2.3 updated
20211118 - Cryptsetup v2.4.2 updated. Thx to @misterhsp.
20220103 - mmc-utils added
20220106 - More tools from @Borovets. See spoiler.
bash-5.1.16-[1]-[2022.01.05].tar.gz
openssl3-3.0.1-[2021.12.14]-static.tar.gz
tree-2.0.0-[2021.12.23]-static.tar.gz
e2fsprogs-1.46.5-[2021.12.31]-static.tar.gz
openssl-1.1.1-m-[2021.12.15]-static.tar.gz
libsqlite-3.37.1-[2021.12.30]-static.tar.gz
ldns-host-1.7.1-[2021.12.30]-static.tar.gz
bootimg-info-2.0-[2021.12.18]-static.tar.gz
bc-5.2.1-[2021.12.29]-static.tar.gz
openssl3-tool-3.0.1-[2021.12.14]-static.tar.gz
openssl-tool-1.1.1-m-[2021.12.15]-static.tar.gz
sqlite-3.37.1-[2021.12.30]-static.tar.gz
stunnel-5.61-[2021.12.17]-static.tar.gz
toybox-0.8.6-borovets-295-applets-[2021.12.30]-static.tar.gz
unrar-6.10-beta-3-[2021.12.11]-static.tar.gz
zstd-1.5.1-[2021.12.22]-static.tar.gz
20220107 - parted v3.4 updated
20220113 - Cryptsetup v2.4.3 updated. Thx to @misterhsp.
20220114 - gptfdisk v1.0.8 added
20220212 - tar v1.34 updated
20220622 - gptfdisk v1.0.9 (armv7) added
20220724 - dialog v1.3 added
20220728 - f2fs tools v1.15.0 updated
20220730 - Cryptsetup v2.5.0 updated. Thx to @misterhsp.
20220806 - 7z-zstd v22.01 added. Thx to @xenosaur
20220910 - rsync v3.2.6 updated
20220913 - htop v3.2.1 added
20220913 - gocryptfs v2.3 updated. Thx to @misterhsp
20220922 - veracrypt v1.25.9 updated
20220924 - fdisk v2.38.1 and file v5.43 added

Data recovery tools:
- PhotoRec 7.2 - PhotoRec is file data recovery software designed to recover lost files including video, documents and archives from hard disks, CD-ROMs, and lost pictures (thus the Photo Recovery name) from digital camera memory. PhotoRec ignores the file system and goes after the underlying data, so it will still work even if your media's file system has been severely damaged or reformatted.
- Testdisk 7.2 - Recover lost partitions and partition tables. For external sdcards. Never use it on internal mmc unless you know what you're doing.
- ext4magic 0.3.2 (with supplementary gnu date binary that can handle relative time like 'date -d "-20minutes" +%s')
- fidentity - A little utility sharing PhotoRec signature database. It identifies the type of data contained in a file and reports the extension as seen by PhotoRec.
- debugfs - Might be helpful on ext2 systems or other stuff.
- strace 4.20 - For debugging. Mainly to catch syslog messages (as Android has no traditional /dev/log buffer).
- strace 5.6 - For aarch64.
- ddrescue v1.25 - Data recovery tool for block devices with errors.

Compression tools:
p7zip v17.01 (fork) - (Download) A new p7zip fork with additional codecs and improvements
pixz - Parallel, indexed xz compressor
xz - Multicore aware version of xz/lzma (use --thread=0)
tar v1.32 - Tar provides the ability to create tar archives, as well as various other kinds of manipulation. Download below. More builds from @mirfatif here.
fxz - (Download) FXZ Utils is a fork of XZ Utils. It adds a multi-threaded radix match finder and optimized encoder.

Misc:
- hexcurse v1.60.0 - Hexcurse is a curses-base hex editing utility that can open, edit, and save files, editing both the hexadecimal and decimal values. 'ncurses' ui layout depends on TERM env variable. Change temporary with eg. 'TERM=xterm-256color hexcurse <file>'. See /system/etc/terminfo for possible terminals (xterm-256color, linux..).
- nethogs v0.8.5 - ncurse/nettop-like per-app separated speedmeter and traffic counter supporting high refresh rate. Try 'nethogs -d0' (speedmeter) or 'nethogs -v1' (traffic counter).
- rsync v3.2.3 - rsync is an open source utility that provides fast incremental file transfer. (--with-rsyncd-conf=/data/etc/rsyncd.conf)
- smbnetfs v0.6.1 - SMBNetFS is a Linux/FreeBSD filesystem that allow you to use samba/microsoft network in the same manner as the network neighborhood in Microsoft Windows. More info see below.
- progress v0.14 - Linux tool to show progress for cp, mv, dd, ... (formerly known as cv). Download here.
- archivemount (20180801) - A fuse filesystem for mounting archives in formats supported by libarchive. Download here.
- squashfuse v0.1.103 - FUSE filesystem to mount squashfs archives Download here.
- FuseISO - FuseISO is a FUSE module to mount ISO filesystem images (.iso, .nrg, .bin, .mdf and .img files). It currently support plain ISO9660 Level 1 and 2, Rock Ridge, Joliet, and zisofs. Download here.
- HSTR v2.2.0 - HSTR (HiSToRy) is a command line utility that brings improved Bash/zsh command completion from the history. It aims to make completion easier and more efficient than Ctrl-r. (If history is empty try setting HISTFILE in /system/etc/bash/bashrc e.g. export HISTFILE=/data/.bash_history).
- GNU screen, tmux - Thanks to @mirfatif.
- dislocker, ntfs-3g, mount.exfat-fuse - Thanks to @mirfatif.
- f2fs-tools - Thanks to @mirfatif. Update: v1.14.0 here.
- parted v3.3 - GNU Parted (the name being the conjunction of the two words PARTition and EDitor) is a free partition editor, used for creating and deleting partitions. Note: It might be useful to partition external sdcards (e.g. to limit adoptable storage). I do not recommend to use it on internal memory. It might brick your phone.
- Several tools compiled by @Borovets
Borovets tools 2021.01.25
arptables-0.0.5-[2021.01.17]-static.zip
autoflushtest-1.0-[2021.01.14]-static.zip
btrfs-compsize-1.3-[build-2]-[2020.12.27].zip
btyacc-3.0-[2021.01.18]-static.zip
c-blosc-1.21.1-development-[2020.12.22].zip
c-blosc2-2.0.0-beta-6-development-[2020.04.21].zip
cabextract-1.9.1-[2021.01.08]-static.zip
compsize-1.3-[2021.01.07]-static.zip
convert-color-space-0.1-[2021.01.18]-static.zip
cpustat-0.02.13-[2021.01.13]-static.zip
doxygen-1.9.2-[2021.01.17]-static.zip
ed-1.17-[2021.01.11]-static.zip
hello-2.10-[2021.01.08]-static.zip
htop-3.0.5-[2021.01.13]-static.zip
ipcalc-ng-1.0.0-[2020.12.28]-static.zip
iw-5.9-[2021.01.08]-static.zip
libsqlite-3.34.1-[2021.01.20].zip
libtar-1.2.20-[2021.01.16]-static.zip
m5-1.0-[2020.12.31]-static.zip
sqlite-3.34.1-[2021.01.20]-static.zip

Borovets tools 2021.01.27
lcab-1.0-beta-12-[2021.01.17].zip
memdump-1.01-[2021.01.25].zip
memdumper-0.4-[2021.01.25].zip
memtester-4.5.0-[2021.01.09].zip
tcpdump-4.99.0-[libcap-1.9.1]-[2021.01.05].zip
wget2-1.99.2-[2020.12.12].zip
wolfssl-4.5.0-[2020.12.12].zip
xfsprogs-5.10.0-[2021.01.01].zip

Crypttools:
(These crypttools are mostly frontend tools for the main backend that resides in the kernel. If your kernel hasn't been configured accordingly at compile time you might not be able to use all features.)
Cryptsetup v2.3.5 - (Download) Cryptsetup is an utility used to conveniently setup disk encryption based on DMCrypt kernel module. These include plain dm-crypt volumes, LUKS volumes, loop-AES and TrueCrypt (including VeraCrypt extension) format.
eCryptfs-utils v111 - Frontend tools for the enterprise cryptographic filesystem for Linux. That's what Android/Google use for encryption. It's file-based (no container) and mounting can be automated by Termux widget. Needs shared libraries but is still portable. See notes below.
EncFS v1.9.5 - EncFS provides an encrypted filesystem in user-space. It runs in userspace, using the FUSE library for the filesystem interface.
gocryptfs - An encrypted overlay filesystem written in Go. Download here. Thanks to @mirfatif.
VeraCrypt - VeraCrypt is a free open source disk encryption software. Download here. Thanks to @mirfatif.
fscrypt 0.2.7 - (Download) fscrypt is a high-level tool for the management of Linux filesystem encryption. Needs at least kernel 4.1.

Crypttools info:

Cryptsetup:

General Notes:
- Features like TrueCrypt, VeraCrypt and LUKS2 need 'userspace crypto api' enabled in kernel. Most Android kernels are probably not configured for that and you have to recompile your kernel or contact your kernel maintainer. For kernel 3.4 you need this:
Code:
CONFIG_CRYPTO_USER=y
CONFIG_CRYPTO_USER_API=y
CONFIG_CRYPTO_USER_API_HASH=y
CONFIG_CRYPTO_USER_API_SKCIPHER=y
- If 'cryptsetup benchmark' is incomplete and says 'userspace crypto api not available' you might be affected. You can still use LUKS1 though. A full benchmark looks like this:
Code:
# cryptsetup benchmark

# Tests are approximate using memory only (no storage IO).
PBKDF2-sha1       249186 iterations per second for 256-bit key
PBKDF2-sha256     327680 iterations per second for 256-bit key
PBKDF2-sha512      58829 iterations per second for 256-bit key
PBKDF2-ripemd160  227555 iterations per second for 256-bit key
PBKDF2-whirlpool   33539 iterations per second for 256-bit key
argon2i       4 iterations, 208288 memory, 4 parallel threads (CPUs) for 256-bit key (requested 2000 ms time)
argon2id      4 iterations, 207817 memory, 4 parallel threads (CPUs) for 256-bit key (requested 2000 ms time)
#     Algorithm | Key |  Encryption |  Decryption
        aes-cbc   128b    77.8 MiB/s    88.4 MiB/s
    serpent-cbc   128b           N/A           N/A
    twofish-cbc   128b    58.5 MiB/s    61.9 MiB/s
        aes-cbc   256b    61.5 MiB/s    68.4 MiB/s
    serpent-cbc   256b           N/A           N/A
    twofish-cbc   256b    58.5 MiB/s    61.8 MiB/s
        aes-xts   256b    95.1 MiB/s    86.9 MiB/s
    serpent-xts   256b           N/A           N/A
    twofish-xts   256b    60.0 MiB/s    61.8 MiB/s
        aes-xts   512b    74.1 MiB/s    67.2 MiB/s
    serpent-xts   512b           N/A           N/A
    twofish-xts   512b    60.3 MiB/s    62.0 MiB/s


LUKS:
Code:
** 10MB test image (luks.img) **
dd if=/dev/zero of=luks.img bs=1M count 10M
cryptsetup luksFormat luks.img
cryptsetup open luks.img myluks
mke2fs -t ext4 /dev/mapper/myluks
mkdir luks
mount /dev/mapper/myluks luks
** luks folder is ready here **
umount luks
cryptsetup close myluks
- If standard luksFormat cipher (aes-xts-plain64) doesn't work (not supported by your kernel) you can try one of the more compatible ciphers:
Code:
cryptsetup luksFormat -c cbc-essiv:sha256 luks.img myluks
cryptsetup luksFormat -c aes-plain luks.img myluks
- For LUKS2 (experimental) use:
Code:
cryptsetup luksFormat --type luks2 luks.img
- Use "cryptsetup -v --debug" for more verbose output (debugging). In case of errors.


Veracrypt:
Code:
cryptsetup open --type tcrypt --veracrypt veracrypt.tc myvera
cryptsetup status myvera
mkdir /data/myvera
mount /dev/mapper/myvera /data/myvera
umount /data/myvera
cryptsetup close myvera
- Use container from desktop system (created with real Veracrypt)
- "veracrypt.tc" is the veracrypt container name
- "myvera" is an arbitrary name (handle)
- Use "cryptsetup -v --debug" for more verbose output (debugging). In case of errors.

eCryptfs-utils:

General Notes:
These tools are not built statically as they explicitly rely on 'dlopen' (plugin system). Instead they are compiled with relative rpaths (./libs). That means dependencies (libraries in subfolders) must be present in the binaries folder and you have to be in the binaries folder itself (with 'cd') before invoking any binary. By this the binaries are still portable (system independent) as long as the subfolders are present. I've put the files into a tar.gz archive so permissions should be set +x already. Extract the archive into /data/local/bin for 'Example' below.
Code:
mkdir -p /data/local/bin
cd /data/local/bin
tar xf crypttools.armv7.20180204.tar.gz
cd ecryptfs
./ecryptfs-stat --help

More info: ArchLinux Wiki

Example:

Tested on /sdcard based on FUSE filesystem. sdcardfs untested. Might need selinux permissive.

We create a folder /sdcard/pics that can be enabled (files present) or disabled (no files present) by a click on a widget button (Termux script) and entering our password. The encryption is done on a per-file basis. The actual files are stored encrypted in /sdcard/efs/pics.

- You might need SuperSU or Magisk Superuser for 'su -mm'. That makes sure that all apps can see the mounted folder (mount namespace separation).
- Busybox needed
- Install Termux and Termux:Widget from F-Droid or Playstore
- Start it and enter:
Code:
pkg upgrade
pkg install tsu
exit
- Create script /data/data/com.termux/files/home/.shortcuts/efs-pics.sh and make sure permissions(700) and owner (take from parent folder) are correct.
Code:
#!/system/xbin/bash
su -mm -c "/system/xbin/bash -c /data/local/scripts/$(basename "$0")"
- Create script /data/local/scripts/efs-pics.sh (770/root):
Code:
#!/system/xbin/bash
set -e
PATH=$PATH:/data/data/com.termux/files/usr/bin

# Necessary because rpaths are relative
cd /data/local/bin/ecryptfs

# /data/myefskey contains the salted key.
# Don't forget to make a backup.
# Without it encrypted data is lost.
function enter_passphrase {
    read -p "Enter passphrase: " passphrase
    sig=$(printf "%s" "$passphrase" | ./ecryptfs-insert-wrapped-passphrase-into-keyring /data/myefskey -) || exit
    sig=$(echo $sig | cut -d "[" -f2 | cut -d "]" -f1)
}

CPATH1="/data/media/0/efs/pics"
CPATH2="/data/media/0/pics"
if ! mountpoint -q ${CPATH2}; then
    enter_passphrase
    echo ""
    mount -t ecryptfs -o ecryptfs_sig=$sig,ecryptfs_fnek_sig=$sig,ecryptfs_cipher=aes,ecryptfs_key_bytes=16 ${CPATH1} ${CPATH2} || (echo "$(basename "$0") mount failed!"; exit)
    ./keyctl clear @u
    echo "$(basename "$0") mount successful! :)"
else
    umount ${CPATH2} || (echo "$(basename "$0") umount error $? :("; exit)
    echo "$(basename "$0") umount successful :)"
fi

# uncomment to force-close Termux window
# killall com.termux
- If your rom uses encryption already (/data/data) beware the './keyctl clear @u' command. It might flush *all* keys in the kernel including the Android encryption one (i'm not sure). This might lead to unpredicted behavior. Either comment it out (then your once injected key remains in the kernel keystore and someone could simply remount your folder without passphrase) or make yourself familiar with the keyctl command and handle it yourself. My phone is not encrypted so i cannot help here.
- Create random keyfile (/data/myefskey) and wrap it with passphrase. This might need 1-2 minutes depending on your devices entropy pool (/dev/random). Backup this key (/data/myefskey). Without it your encrypted data is lost. And don't forget the trailing '-' (minus) at the end of the line, it's important.
Code:
cd /data/local/bin/ecryptfs
read -p "Enter passphrase: " passphrase; printf "%s\n%s" $(busybox od -x -N 100 --width=30 /dev/random | head -n 1 | busybox sed "s/^0000000//" | busybox sed "s/[[:space:]]*//g") "${passphrase}" | ./ecryptfs-wrap-passphrase /data/myefskey -
- Create folders:
Code:
mkdir -p /sdcard/efs/pics /sdcard/pics
- Create Widget (Termux) and select 'efs-pics.sh'.
- Start it and enter your passphrase (you used above). If everything goes well (it will tell you) you can place files into /sdcard/pics and scrambled files should come up in /sdcard/efs/pics. Never write into /sdcard/efs/pics directly.
- Activate widget again. /sdcard/pics should get emptied.
- Optional: You can set /data/media/0/efs/pics to 700/root so no one can access/see the encrypted data.

SMBNetFS info:

Note: The library paths are relative. You need to be in the folder (with 'cd') to spawn the executable (./smbnetfs). You can extract the archive wherever you want though as far as the file/folder structure remains intact.

Example:
Code:
mount -o remount,rw /
mkdir -p /data/local/bin /mnt/cifs
mount -o remount,ro /
tar xf smbnetfs.tar.gz -C /data/local/bin
cd /data/local/bin/smbnetfs
export HOME=/data/local/bin/smbnetfs/home
* enter your smb credentials into smbnetfs/home/.smb/smbnetfs.auth (eg. auth "192.168.1.2" "${user}" "${pass}")
./smbnetfs /mnt/cifs
cd /mnt/cifs/192.168.1.2/${share}
I think it usually should list the samba environment in /mnt/cifs but i'm not sure which prerequisites are necessary for that (edit: maybe it needs real workgroup/hostname instead of IPs). If nothing comes up this should work:
The folder 192.168.1.2/${share} is unreachable by Androids folder picker (unless you can enter the path manually). So either pre-create the folder structure beforehand (mkdir -p /mnt/cifs/192.168.1.2/${share}) and add/register the folder to your app by folder picker (eg. MXPlayer) and then overmount that with the actual ${share}. Or bindmount the folder:
Code:
mount --bind /mnt/cifs/192.168.1.2/${share} /mnt/cifs2
Edit: Another option is to let smbnetfs create a static link (actually a symbolic link) to the share in the mountpoint root (/mnt/cifs). Its not as robust as the bindmount though. MXPlayer doesn't find any files (even though the folder picker shows the folders properly).
Code:
echo "link myfiles 192.168.1.2/${share}" > /data/local/bin/smbnetfs/home/.smb/smbnetfs.host
chmod 700 /data/local/bin/smbnetfs/home/.smb/smbnetfs.host

I've noticed that MXPlayer shows the samba folders just for a glimpse of a second. But if you enter one of the local folders and then go back all samba folders are there. Not sure why this is happening or maybe its just my system.

Edit2: Not yet tested but.. check the permissions. Its possible that SMBNetFS mounts with 755 or something. That's inaccessible for Android apps. Try this:
Code:
./smbnetfs -o umask=000,noatime,noexec,nodev,nosuid /mnt/cifs

Samba 4.8.3 configuration:
Code:
_idmap_modules=idmap_rid,idmap_hash,idmap_tdb2
_pdb_modules=pdb_tdbsam,pdb_smbpasswd,pdb_wbc_sam,pdb_samba4
_auth_modules=auth_unix,auth_wbc,auth_server,auth_netlogond,auth_script,auth_samba4

waf configure --prefix=/tmp/myout \
-C \
--sysconfdir=./conf/etc/samba \
--with-configdir=./conf/etc/samba \
--localstatedir=./conf/var \
--libexecdir=./conf/usr/lib \
--enable-fhs \
--with-lockdir=./conf/var/cache/samba \
--with-piddir=./conf/run/samba \
--with-logfilebase=./conf/var/log/samba \
--without-pam \
--without-systemd \
--without-ads \
--with-shared-modules=$_idmap_modules,$_pdb_modules,$_auth_modules \
--disable-cups \
--without-gettext \
--bundled-libraries=NONE,com_err,ldb,uid_wrapper,resolv_wrapper,socket_wrapper,nss_wrapper,ntdb,roken,wind,hx509,asn1,heimbase,hcrypto,krb5,gssapi,heimntlm,hdb,kdc,cmocka,talloc,tdb,pytdb,ldb,pyldb,tevent,pytevent \
--disable-rpath-install \
--disable-python --without-ad-dc --without-acl-support --without-ldap \
--hostcc=/usr/bin/gcc \
--cross-compile --cross-execute='qemu-arm -L /media/devpart/qemu/root'

waf build -j4
waf install
 

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Last edited:

DualJoe

Senior Member
Oct 12, 2011
2,181
1,067
de
Ecryptfs-simple is not POSIX compliant. It relies on an argv interface (to parse command-line parameters) that is a GNU extension that musl doesn't support.
The original eCryptFS is simple enough anyway (and its the upstream project). I will provide a quickstart example and a one button GUI controlled solution (Termux widget) to handle it.
 
Last edited:

buengeut

Senior Member
Jun 15, 2017
51
19
Mountpoint is not writable (eCryptfs)

Crypttools and quickstart tutorials added.
Can't write to mountpoint.
# touch /sdcard/pics/test
touch: /sdcard/pics/test: Permission denied

# cp file /sdcard/pics
cp: can't create '/sdcard/pics/file': Permission denied
 
Last edited:

DualJoe

Senior Member
Oct 12, 2011
2,181
1,067
de
touch: /sdcard/pics/test: Permission denied
What are your permissions?
Code:
# stat /data/media/0/pics
Access: (775/drwxrwxr-x)	Uid: (1023/media_rw)	Gid: (1023/media_rw)

# stat /data/media/0/efs
Access: (775/drwxrwxr-x)	Uid: (1023/media_rw)	Gid: (1023/media_rw)

# stat /data/media/0/efs/pics
Access: (775/drwxrwxr-x)	Uid: (1023/media_rw)	Gid: (1023/media_rw)

How does your mount look like?
Code:
# mount |grep pics
/data/media/0/efs/pics on /data/media/0/pics type ecryptfs (rw,relatime,ecryptfs_fnek_sig=56b1f3c519fb3412,ecryptfs_sig=56b1f3c519fb3412,ecryptfs_cipher=aes,ecryptfs_key_bytes=16)

Is /sdcard linked?
Code:
# ls -l /sdcard
lrwxrwxrwx    1 root     root            21 May 10  1973 /sdcard -> /storage/self/primary

What Android version and kernel do you have?
 
Last edited:
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buengeut

Senior Member
Jun 15, 2017
51
19
What are your permissions?
Code:
# stat /data/media/0/pics
Access: (775/drwxrwxr-x)	Uid: (1023/media_rw)	Gid: (1023/media_rw)

# stat /data/media/0/efs
Access: (775/drwxrwxr-x)	Uid: (1023/media_rw)	Gid: (1023/media_rw)

# stat /data/media/0/efs/pics
Access: (775/drwxrwxr-x)	Uid: (1023/media_rw)	Gid: (1023/media_rw)

How does your mount look like?
Code:
# mount |grep pics
/data/media/0/efs/pics on /data/media/0/pics type ecryptfs (rw,relatime,ecryptfs_fnek_sig=56b1f3c519fb3412,ecryptfs_sig=56b1f3c519fb3412,ecryptfs_cipher=aes,ecryptfs_key_bytes=16)

Is /sdcard linked?
Code:
# ls -l /sdcard
lrwxrwxrwx    1 root     root            21 May 10  1973 /sdcard -> /storage/self/primary

What Android version and kernel do you have?

Android 6.0 kernel 3.18.14

/sdcard is symlink to /mnt/sdcard, i changed /sdcard to /mnt/sdcard

Code:
# mount -t ecryptfs
/mnt/sdcard/efs/pics on /mnt/sdcard/pics type ecryptfs (rw,relatime,ecryptfs_fnek_sig=1b77138d91206e66,ecryptfs_sig=1b77138d91206e66,ecryptfs_cipher=aes,ecryptfs_key_bytes=16)

Code:
# stat /mnt/sdcard/pics
Access: (775/drwxrwxr-x)	Uid: (1000/ system)	Gid: (1015/sdcard_rw)

# stat /mnt/sdcard/efs
Access: (775/drwxrwxr-x)	Uid: (1000/ system)	Gid: (1015/sdcard_rw)

# stat /mnt/sdcard/efs/pics
Access: (775/drwxrwxr-x)	Uid: (1000/ system)	Gid: (1015/sdcard_rw)
Code:
# touch /mnt/sdcard/pics/test
touch: /mnt/sdcard/pics/test: Permission denied
 
Last edited:

DualJoe

Senior Member
Oct 12, 2011
2,181
1,067
de
What about the permissions of /data/media/0 folders? That's the most important part.

If your sdcard is not at /data/media/0 you probably don't have a multiuser environment (older phone?) and /mnt/sdcard is probably a real partition. This is early Kitkat partition layout (/sdcard and /data have separate partitions). On later systems both are on /data partition and /sdcard is abstracted by a FUSE file system that would automatically set the proper permissions whenever you write something to it (even as root).

In case you are on an old layout you would need to set proper permissions to /sdcard/pics and /sdcard/efs yourself. Just take a look at the other folders with 'ls -l /mnt/sdcard' and set accordingly. You would also need to change /data/media/0 to /mnt/sdcard in the script.


What do you get with this?
Code:
# mount |grep sdcard
# mount |grep storage

What phone is it? Kernel 3.18 doesn't sound all too old.

Edit: Another theory is your internal sdcard is scardfs or something. If so, it might break "stacking" folders (mount over). Try to use /data/pics and /data/efs/pics as a test.
 
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buengeut

Senior Member
Jun 15, 2017
51
19
It works in Permissive mode (setenforce 0)

I need Busybox with SELinux-enabled and use it to set it to Permissive mode

Code:
# busybox getenforce
Enforcing

# busybox setenforce 0
# busybox getenforce
Permissive

And then execute the efs-pics.sh and test it
Code:
# cp file /mnt/sdcard/pics ; echo $? 
[b]0[/b] 

# ls /mnt/sdcard/pics
[b]file[/b]

Horreee.... it Works.
 
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    rsync326.aarch64.static.20220910.tar.gz
    - compiled with md4, md5, zst, lz4 support
    1
    htop321.armv7.static.20220913.tar.gz
  • 37
    Native ARM/static Linux binaries
    (for all ARMv7+ compatible platforms)


    Open-source Linux binaries that are either not available on Android (e.g. in Termux)
    or make sense to be statically compiled (e.g. to run in TWRP/recovery for data recovery).

    These are root tools and might damage your device severely. Use at your own risk. I take no responsibility whatsoever. If in doubt don't use them.

    Minimum CPU: ARMv7/vfpv3-d16. Compiled against musl-libc/Android Kernel 3.4. Binaries are static, bionic/libc independent and should run on Android, TWRP, emulator or any other compatible ARM device. Musl is patched (info)(info2)(patch file: patch -p0 -u -b -i musl-android-smp.patch) to iterate CPU cores by /proc/stat instead of _SC_NPROCESSORS_CONF/sched_getaffinity to prevent false detection due to ARM cpu core powersaving (permanently turning cores on/off). This should report CPU cores more reliably to multithreading apps.

    Example instructions how to build EncFS can be found here.
    Some Cryptsetup compile recipes are here.

    Changelog:
    20190923 - f2fs-tools added
    20190915 - dislocker, ntfs-3g, mount.exfat-fuse added
    20190910 - VeraCrypt v1.24-b5 added
    20191215 - musl smp patch added
    20191224 - hstr v2.2.0 updated
    20191225 - Testdisk, PhotoRec v7.2-wip-dec2019 updated
    20200103 - tar v1.32 updated (with selinux, acl, xattr support)
    20200513 - Cryptsetup v2.3.2 added
    20200518 - fscrypt 0.2.7, strace56(aarch64) added
    20200525 - p7zip v17.01 added
    20200603 - parted v3.3 added
    20200606 - fxz v1.1.0alpha added
    20201212 - ddrescue v1.25 added
    20201212 - Cryptsetup v2.3.4 updated
    20210113 - f2fs-tools updated to v1.14.0
    20210125 - Several tools compiled by @Borovets. See 'Misc' tools.
    20210413 - Cryptsetup v2.3.5 updated
    20210916 - Cryptsetup v2.4.1 updated. Thx to @misterhsp.
    20211108 - rsync v3.2.3 updated
    20211118 - Cryptsetup v2.4.2 updated. Thx to @misterhsp.
    20220103 - mmc-utils added
    20220106 - More tools from @Borovets. See spoiler.
    bash-5.1.16-[1]-[2022.01.05].tar.gz
    openssl3-3.0.1-[2021.12.14]-static.tar.gz
    tree-2.0.0-[2021.12.23]-static.tar.gz
    e2fsprogs-1.46.5-[2021.12.31]-static.tar.gz
    openssl-1.1.1-m-[2021.12.15]-static.tar.gz
    libsqlite-3.37.1-[2021.12.30]-static.tar.gz
    ldns-host-1.7.1-[2021.12.30]-static.tar.gz
    bootimg-info-2.0-[2021.12.18]-static.tar.gz
    bc-5.2.1-[2021.12.29]-static.tar.gz
    openssl3-tool-3.0.1-[2021.12.14]-static.tar.gz
    openssl-tool-1.1.1-m-[2021.12.15]-static.tar.gz
    sqlite-3.37.1-[2021.12.30]-static.tar.gz
    stunnel-5.61-[2021.12.17]-static.tar.gz
    toybox-0.8.6-borovets-295-applets-[2021.12.30]-static.tar.gz
    unrar-6.10-beta-3-[2021.12.11]-static.tar.gz
    zstd-1.5.1-[2021.12.22]-static.tar.gz
    20220107 - parted v3.4 updated
    20220113 - Cryptsetup v2.4.3 updated. Thx to @misterhsp.
    20220114 - gptfdisk v1.0.8 added
    20220212 - tar v1.34 updated
    20220622 - gptfdisk v1.0.9 (armv7) added
    20220724 - dialog v1.3 added
    20220728 - f2fs tools v1.15.0 updated
    20220730 - Cryptsetup v2.5.0 updated. Thx to @misterhsp.
    20220806 - 7z-zstd v22.01 added. Thx to @xenosaur
    20220910 - rsync v3.2.6 updated
    20220913 - htop v3.2.1 added
    20220913 - gocryptfs v2.3 updated. Thx to @misterhsp
    20220922 - veracrypt v1.25.9 updated
    20220924 - fdisk v2.38.1 and file v5.43 added

    Data recovery tools:
    - PhotoRec 7.2 - PhotoRec is file data recovery software designed to recover lost files including video, documents and archives from hard disks, CD-ROMs, and lost pictures (thus the Photo Recovery name) from digital camera memory. PhotoRec ignores the file system and goes after the underlying data, so it will still work even if your media's file system has been severely damaged or reformatted.
    - Testdisk 7.2 - Recover lost partitions and partition tables. For external sdcards. Never use it on internal mmc unless you know what you're doing.
    - ext4magic 0.3.2 (with supplementary gnu date binary that can handle relative time like 'date -d "-20minutes" +%s')
    - fidentity - A little utility sharing PhotoRec signature database. It identifies the type of data contained in a file and reports the extension as seen by PhotoRec.
    - debugfs - Might be helpful on ext2 systems or other stuff.
    - strace 4.20 - For debugging. Mainly to catch syslog messages (as Android has no traditional /dev/log buffer).
    - strace 5.6 - For aarch64.
    - ddrescue v1.25 - Data recovery tool for block devices with errors.

    Compression tools:
    p7zip v17.01 (fork) - (Download) A new p7zip fork with additional codecs and improvements
    pixz - Parallel, indexed xz compressor
    xz - Multicore aware version of xz/lzma (use --thread=0)
    tar v1.32 - Tar provides the ability to create tar archives, as well as various other kinds of manipulation. Download below. More builds from @mirfatif here.
    fxz - (Download) FXZ Utils is a fork of XZ Utils. It adds a multi-threaded radix match finder and optimized encoder.

    Misc:
    - hexcurse v1.60.0 - Hexcurse is a curses-base hex editing utility that can open, edit, and save files, editing both the hexadecimal and decimal values. 'ncurses' ui layout depends on TERM env variable. Change temporary with eg. 'TERM=xterm-256color hexcurse <file>'. See /system/etc/terminfo for possible terminals (xterm-256color, linux..).
    - nethogs v0.8.5 - ncurse/nettop-like per-app separated speedmeter and traffic counter supporting high refresh rate. Try 'nethogs -d0' (speedmeter) or 'nethogs -v1' (traffic counter).
    - rsync v3.2.3 - rsync is an open source utility that provides fast incremental file transfer. (--with-rsyncd-conf=/data/etc/rsyncd.conf)
    - smbnetfs v0.6.1 - SMBNetFS is a Linux/FreeBSD filesystem that allow you to use samba/microsoft network in the same manner as the network neighborhood in Microsoft Windows. More info see below.
    - progress v0.14 - Linux tool to show progress for cp, mv, dd, ... (formerly known as cv). Download here.
    - archivemount (20180801) - A fuse filesystem for mounting archives in formats supported by libarchive. Download here.
    - squashfuse v0.1.103 - FUSE filesystem to mount squashfs archives Download here.
    - FuseISO - FuseISO is a FUSE module to mount ISO filesystem images (.iso, .nrg, .bin, .mdf and .img files). It currently support plain ISO9660 Level 1 and 2, Rock Ridge, Joliet, and zisofs. Download here.
    - HSTR v2.2.0 - HSTR (HiSToRy) is a command line utility that brings improved Bash/zsh command completion from the history. It aims to make completion easier and more efficient than Ctrl-r. (If history is empty try setting HISTFILE in /system/etc/bash/bashrc e.g. export HISTFILE=/data/.bash_history).
    - GNU screen, tmux - Thanks to @mirfatif.
    - dislocker, ntfs-3g, mount.exfat-fuse - Thanks to @mirfatif.
    - f2fs-tools - Thanks to @mirfatif. Update: v1.14.0 here.
    - parted v3.3 - GNU Parted (the name being the conjunction of the two words PARTition and EDitor) is a free partition editor, used for creating and deleting partitions. Note: It might be useful to partition external sdcards (e.g. to limit adoptable storage). I do not recommend to use it on internal memory. It might brick your phone.
    - Several tools compiled by @Borovets
    Borovets tools 2021.01.25
    arptables-0.0.5-[2021.01.17]-static.zip
    autoflushtest-1.0-[2021.01.14]-static.zip
    btrfs-compsize-1.3-[build-2]-[2020.12.27].zip
    btyacc-3.0-[2021.01.18]-static.zip
    c-blosc-1.21.1-development-[2020.12.22].zip
    c-blosc2-2.0.0-beta-6-development-[2020.04.21].zip
    cabextract-1.9.1-[2021.01.08]-static.zip
    compsize-1.3-[2021.01.07]-static.zip
    convert-color-space-0.1-[2021.01.18]-static.zip
    cpustat-0.02.13-[2021.01.13]-static.zip
    doxygen-1.9.2-[2021.01.17]-static.zip
    ed-1.17-[2021.01.11]-static.zip
    hello-2.10-[2021.01.08]-static.zip
    htop-3.0.5-[2021.01.13]-static.zip
    ipcalc-ng-1.0.0-[2020.12.28]-static.zip
    iw-5.9-[2021.01.08]-static.zip
    libsqlite-3.34.1-[2021.01.20].zip
    libtar-1.2.20-[2021.01.16]-static.zip
    m5-1.0-[2020.12.31]-static.zip
    sqlite-3.34.1-[2021.01.20]-static.zip

    Borovets tools 2021.01.27
    lcab-1.0-beta-12-[2021.01.17].zip
    memdump-1.01-[2021.01.25].zip
    memdumper-0.4-[2021.01.25].zip
    memtester-4.5.0-[2021.01.09].zip
    tcpdump-4.99.0-[libcap-1.9.1]-[2021.01.05].zip
    wget2-1.99.2-[2020.12.12].zip
    wolfssl-4.5.0-[2020.12.12].zip
    xfsprogs-5.10.0-[2021.01.01].zip

    Crypttools:
    (These crypttools are mostly frontend tools for the main backend that resides in the kernel. If your kernel hasn't been configured accordingly at compile time you might not be able to use all features.)
    Cryptsetup v2.3.5 - (Download) Cryptsetup is an utility used to conveniently setup disk encryption based on DMCrypt kernel module. These include plain dm-crypt volumes, LUKS volumes, loop-AES and TrueCrypt (including VeraCrypt extension) format.
    eCryptfs-utils v111 - Frontend tools for the enterprise cryptographic filesystem for Linux. That's what Android/Google use for encryption. It's file-based (no container) and mounting can be automated by Termux widget. Needs shared libraries but is still portable. See notes below.
    EncFS v1.9.5 - EncFS provides an encrypted filesystem in user-space. It runs in userspace, using the FUSE library for the filesystem interface.
    gocryptfs - An encrypted overlay filesystem written in Go. Download here. Thanks to @mirfatif.
    VeraCrypt - VeraCrypt is a free open source disk encryption software. Download here. Thanks to @mirfatif.
    fscrypt 0.2.7 - (Download) fscrypt is a high-level tool for the management of Linux filesystem encryption. Needs at least kernel 4.1.

    Crypttools info:

    Cryptsetup:

    General Notes:
    - Features like TrueCrypt, VeraCrypt and LUKS2 need 'userspace crypto api' enabled in kernel. Most Android kernels are probably not configured for that and you have to recompile your kernel or contact your kernel maintainer. For kernel 3.4 you need this:
    Code:
    CONFIG_CRYPTO_USER=y
    CONFIG_CRYPTO_USER_API=y
    CONFIG_CRYPTO_USER_API_HASH=y
    CONFIG_CRYPTO_USER_API_SKCIPHER=y
    - If 'cryptsetup benchmark' is incomplete and says 'userspace crypto api not available' you might be affected. You can still use LUKS1 though. A full benchmark looks like this:
    Code:
    # cryptsetup benchmark
    
    # Tests are approximate using memory only (no storage IO).
    PBKDF2-sha1       249186 iterations per second for 256-bit key
    PBKDF2-sha256     327680 iterations per second for 256-bit key
    PBKDF2-sha512      58829 iterations per second for 256-bit key
    PBKDF2-ripemd160  227555 iterations per second for 256-bit key
    PBKDF2-whirlpool   33539 iterations per second for 256-bit key
    argon2i       4 iterations, 208288 memory, 4 parallel threads (CPUs) for 256-bit key (requested 2000 ms time)
    argon2id      4 iterations, 207817 memory, 4 parallel threads (CPUs) for 256-bit key (requested 2000 ms time)
    #     Algorithm | Key |  Encryption |  Decryption
            aes-cbc   128b    77.8 MiB/s    88.4 MiB/s
        serpent-cbc   128b           N/A           N/A
        twofish-cbc   128b    58.5 MiB/s    61.9 MiB/s
            aes-cbc   256b    61.5 MiB/s    68.4 MiB/s
        serpent-cbc   256b           N/A           N/A
        twofish-cbc   256b    58.5 MiB/s    61.8 MiB/s
            aes-xts   256b    95.1 MiB/s    86.9 MiB/s
        serpent-xts   256b           N/A           N/A
        twofish-xts   256b    60.0 MiB/s    61.8 MiB/s
            aes-xts   512b    74.1 MiB/s    67.2 MiB/s
        serpent-xts   512b           N/A           N/A
        twofish-xts   512b    60.3 MiB/s    62.0 MiB/s


    LUKS:
    Code:
    ** 10MB test image (luks.img) **
    dd if=/dev/zero of=luks.img bs=1M count 10M
    cryptsetup luksFormat luks.img
    cryptsetup open luks.img myluks
    mke2fs -t ext4 /dev/mapper/myluks
    mkdir luks
    mount /dev/mapper/myluks luks
    ** luks folder is ready here **
    umount luks
    cryptsetup close myluks
    - If standard luksFormat cipher (aes-xts-plain64) doesn't work (not supported by your kernel) you can try one of the more compatible ciphers:
    Code:
    cryptsetup luksFormat -c cbc-essiv:sha256 luks.img myluks
    cryptsetup luksFormat -c aes-plain luks.img myluks
    - For LUKS2 (experimental) use:
    Code:
    cryptsetup luksFormat --type luks2 luks.img
    - Use "cryptsetup -v --debug" for more verbose output (debugging). In case of errors.


    Veracrypt:
    Code:
    cryptsetup open --type tcrypt --veracrypt veracrypt.tc myvera
    cryptsetup status myvera
    mkdir /data/myvera
    mount /dev/mapper/myvera /data/myvera
    umount /data/myvera
    cryptsetup close myvera
    - Use container from desktop system (created with real Veracrypt)
    - "veracrypt.tc" is the veracrypt container name
    - "myvera" is an arbitrary name (handle)
    - Use "cryptsetup -v --debug" for more verbose output (debugging). In case of errors.

    eCryptfs-utils:

    General Notes:
    These tools are not built statically as they explicitly rely on 'dlopen' (plugin system). Instead they are compiled with relative rpaths (./libs). That means dependencies (libraries in subfolders) must be present in the binaries folder and you have to be in the binaries folder itself (with 'cd') before invoking any binary. By this the binaries are still portable (system independent) as long as the subfolders are present. I've put the files into a tar.gz archive so permissions should be set +x already. Extract the archive into /data/local/bin for 'Example' below.
    Code:
    mkdir -p /data/local/bin
    cd /data/local/bin
    tar xf crypttools.armv7.20180204.tar.gz
    cd ecryptfs
    ./ecryptfs-stat --help

    More info: ArchLinux Wiki

    Example:

    Tested on /sdcard based on FUSE filesystem. sdcardfs untested. Might need selinux permissive.

    We create a folder /sdcard/pics that can be enabled (files present) or disabled (no files present) by a click on a widget button (Termux script) and entering our password. The encryption is done on a per-file basis. The actual files are stored encrypted in /sdcard/efs/pics.

    - You might need SuperSU or Magisk Superuser for 'su -mm'. That makes sure that all apps can see the mounted folder (mount namespace separation).
    - Busybox needed
    - Install Termux and Termux:Widget from F-Droid or Playstore
    - Start it and enter:
    Code:
    pkg upgrade
    pkg install tsu
    exit
    - Create script /data/data/com.termux/files/home/.shortcuts/efs-pics.sh and make sure permissions(700) and owner (take from parent folder) are correct.
    Code:
    #!/system/xbin/bash
    su -mm -c "/system/xbin/bash -c /data/local/scripts/$(basename "$0")"
    - Create script /data/local/scripts/efs-pics.sh (770/root):
    Code:
    #!/system/xbin/bash
    set -e
    PATH=$PATH:/data/data/com.termux/files/usr/bin
    
    # Necessary because rpaths are relative
    cd /data/local/bin/ecryptfs
    
    # /data/myefskey contains the salted key.
    # Don't forget to make a backup.
    # Without it encrypted data is lost.
    function enter_passphrase {
        read -p "Enter passphrase: " passphrase
        sig=$(printf "%s" "$passphrase" | ./ecryptfs-insert-wrapped-passphrase-into-keyring /data/myefskey -) || exit
        sig=$(echo $sig | cut -d "[" -f2 | cut -d "]" -f1)
    }
    
    CPATH1="/data/media/0/efs/pics"
    CPATH2="/data/media/0/pics"
    if ! mountpoint -q ${CPATH2}; then
        enter_passphrase
        echo ""
        mount -t ecryptfs -o ecryptfs_sig=$sig,ecryptfs_fnek_sig=$sig,ecryptfs_cipher=aes,ecryptfs_key_bytes=16 ${CPATH1} ${CPATH2} || (echo "$(basename "$0") mount failed!"; exit)
        ./keyctl clear @u
        echo "$(basename "$0") mount successful! :)"
    else
        umount ${CPATH2} || (echo "$(basename "$0") umount error $? :("; exit)
        echo "$(basename "$0") umount successful :)"
    fi
    
    # uncomment to force-close Termux window
    # killall com.termux
    - If your rom uses encryption already (/data/data) beware the './keyctl clear @u' command. It might flush *all* keys in the kernel including the Android encryption one (i'm not sure). This might lead to unpredicted behavior. Either comment it out (then your once injected key remains in the kernel keystore and someone could simply remount your folder without passphrase) or make yourself familiar with the keyctl command and handle it yourself. My phone is not encrypted so i cannot help here.
    - Create random keyfile (/data/myefskey) and wrap it with passphrase. This might need 1-2 minutes depending on your devices entropy pool (/dev/random). Backup this key (/data/myefskey). Without it your encrypted data is lost. And don't forget the trailing '-' (minus) at the end of the line, it's important.
    Code:
    cd /data/local/bin/ecryptfs
    read -p "Enter passphrase: " passphrase; printf "%s\n%s" $(busybox od -x -N 100 --width=30 /dev/random | head -n 1 | busybox sed "s/^0000000//" | busybox sed "s/[[:space:]]*//g") "${passphrase}" | ./ecryptfs-wrap-passphrase /data/myefskey -
    - Create folders:
    Code:
    mkdir -p /sdcard/efs/pics /sdcard/pics
    - Create Widget (Termux) and select 'efs-pics.sh'.
    - Start it and enter your passphrase (you used above). If everything goes well (it will tell you) you can place files into /sdcard/pics and scrambled files should come up in /sdcard/efs/pics. Never write into /sdcard/efs/pics directly.
    - Activate widget again. /sdcard/pics should get emptied.
    - Optional: You can set /data/media/0/efs/pics to 700/root so no one can access/see the encrypted data.

    SMBNetFS info:

    Note: The library paths are relative. You need to be in the folder (with 'cd') to spawn the executable (./smbnetfs). You can extract the archive wherever you want though as far as the file/folder structure remains intact.

    Example:
    Code:
    mount -o remount,rw /
    mkdir -p /data/local/bin /mnt/cifs
    mount -o remount,ro /
    tar xf smbnetfs.tar.gz -C /data/local/bin
    cd /data/local/bin/smbnetfs
    export HOME=/data/local/bin/smbnetfs/home
    * enter your smb credentials into smbnetfs/home/.smb/smbnetfs.auth (eg. auth "192.168.1.2" "${user}" "${pass}")
    ./smbnetfs /mnt/cifs
    cd /mnt/cifs/192.168.1.2/${share}
    I think it usually should list the samba environment in /mnt/cifs but i'm not sure which prerequisites are necessary for that (edit: maybe it needs real workgroup/hostname instead of IPs). If nothing comes up this should work:
    The folder 192.168.1.2/${share} is unreachable by Androids folder picker (unless you can enter the path manually). So either pre-create the folder structure beforehand (mkdir -p /mnt/cifs/192.168.1.2/${share}) and add/register the folder to your app by folder picker (eg. MXPlayer) and then overmount that with the actual ${share}. Or bindmount the folder:
    Code:
    mount --bind /mnt/cifs/192.168.1.2/${share} /mnt/cifs2
    Edit: Another option is to let smbnetfs create a static link (actually a symbolic link) to the share in the mountpoint root (/mnt/cifs). Its not as robust as the bindmount though. MXPlayer doesn't find any files (even though the folder picker shows the folders properly).
    Code:
    echo "link myfiles 192.168.1.2/${share}" > /data/local/bin/smbnetfs/home/.smb/smbnetfs.host
    chmod 700 /data/local/bin/smbnetfs/home/.smb/smbnetfs.host

    I've noticed that MXPlayer shows the samba folders just for a glimpse of a second. But if you enter one of the local folders and then go back all samba folders are there. Not sure why this is happening or maybe its just my system.

    Edit2: Not yet tested but.. check the permissions. Its possible that SMBNetFS mounts with 755 or something. That's inaccessible for Android apps. Try this:
    Code:
    ./smbnetfs -o umask=000,noatime,noexec,nodev,nosuid /mnt/cifs

    Samba 4.8.3 configuration:
    Code:
    _idmap_modules=idmap_rid,idmap_hash,idmap_tdb2
    _pdb_modules=pdb_tdbsam,pdb_smbpasswd,pdb_wbc_sam,pdb_samba4
    _auth_modules=auth_unix,auth_wbc,auth_server,auth_netlogond,auth_script,auth_samba4
    
    waf configure --prefix=/tmp/myout \
    -C \
    --sysconfdir=./conf/etc/samba \
    --with-configdir=./conf/etc/samba \
    --localstatedir=./conf/var \
    --libexecdir=./conf/usr/lib \
    --enable-fhs \
    --with-lockdir=./conf/var/cache/samba \
    --with-piddir=./conf/run/samba \
    --with-logfilebase=./conf/var/log/samba \
    --without-pam \
    --without-systemd \
    --without-ads \
    --with-shared-modules=$_idmap_modules,$_pdb_modules,$_auth_modules \
    --disable-cups \
    --without-gettext \
    --bundled-libraries=NONE,com_err,ldb,uid_wrapper,resolv_wrapper,socket_wrapper,nss_wrapper,ntdb,roken,wind,hx509,asn1,heimbase,hcrypto,krb5,gssapi,heimntlm,hdb,kdc,cmocka,talloc,tdb,pytdb,ldb,pyldb,tevent,pytevent \
    --disable-rpath-install \
    --disable-python --without-ad-dc --without-acl-support --without-ldap \
    --hostcc=/usr/bin/gcc \
    --cross-compile --cross-execute='qemu-arm -L /media/devpart/qemu/root'
    
    waf build -j4
    waf install
    7
    Compression tools added.
    Next are crypttools (ecryptfs-utils, cryptsetup).
    6
    I only have gifsicle. The other ones are too complex for my setup atm.
    5
    Do you use them directly on your phone for web postings or something? What's your use case to not prefer a desktop system for this?