6/6/2023 0 Comments Msecure permission denied![]() In Android 7 sdcardfs support was added in parallel to FUSE and the "Always block security-sensitive files" functionality was added to sdcardfs in kernel. In Android 6 the app2sd method was abandoned in favor of Adoptable Storage (also filesystem UUID was included in mount points). Later in Android 4.4 when FUSE was started being used for emulating SD cards from original mount point ( /mnt/media_rw/sdcard1) to user accessible path ( /storage/sdcard1/), the zero-sized tmpfs functionality ( Ignore attempts to access security sensitive files) was shifted to sdcard daemon which was used to mount FUSE. In order to protect the /android_secure directory on VFAT removable media from being mucked with by 3rd party applications on the device, we hide the directory with a read-only, zero-sized tmpfs mounted on-top. android_secure IS RESTRICTED?įrom the early days of Android, access to android_secure folder (which later became. Symlinks from /data/app// and possibly /data/data//lib/ are pointing towards /mnt/asec// and /mnt/asec//lib/. asec) are decrypted (using dm-crypt) and mounted to individual directories (named after package names) in a temporary filesystem mounted at /mnt/asec/ by vold. android_secure is bind mounted to /mnt/secure/asec/ and the ( ext4) filesystem containers (. android_secure folder on external SD card or internal sdcard partition (mounted at /mnt/sdcard/ or /mnt/media_rw/sdcard/). apk files (or whole /data/app// directories) are moved as encrypted. In order to solve the problem of space shortage in internal storage, app2sd ( Move to SD Card) was Android's native feature up to Lollipop. Let me try to demystify it, starting with brief history. ![]() I just can't understand root being unable to even see what those different protections are.Ī quick search reveals that there exist similar unanswered questions ( this, this and this). I can accept that the magic filesystem and/or SELinux makes it possible to have different protections on one file. ![]() How is it ever possible to deny root the ability to list a directory entry? (And then change the protections on that entry.) If I have the permissions needed to list some directory entries, how am I being forbidden to list a specific entry in that directory? I have read What does /mnt/asec directory contain? but it doesn't answer my questions:
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