How to create a symbolic link with short fullpath?

Question

I am editing paths on some binaries short of recompiling them.

I want to replace /lib/ld-linux-armhf.so.3, which I cannot create, by a path of same length, that I can create without rooting the phone. It should be something of the same length because I am editing binaries. I have chosen the path /data/data/com.clk/.so.3, after the different possibilities listed below. What I'm trying to do is create /data/data/com.clk/.so.3, which should be a symbolic link to /data/data/com.spartacusrex.spartacuside/gentoo_armv6l/lib/ld-linux-armhf.so.3

I initially used /proc/5781/cwd/rmhf.so.3, but this is not readable by other applications (which are other linux accounts).

I then tried /data/.tmp, but it is specific to my phone, and not documented according to @ChrisStratton. Same about /data/logcat_log.

/sdcard is excluded because fuse options rw,nosuid,nodev,relatime,user_id=1015,group_id=1015,default_permissions,allow_other restrict links and exectuables and /lib/ld-linux-armhf.so.3 is to be executed.

Does anyone know how else I can accomplish this?

Answer 1

Have you considered using PatchELF rather than rolling your own binary editing? It claims to be smart enough to insert an extra page into the ELF header as needed to make room for longer interpreter or RPATH fields. That would allow you to use the real interpreter value rather than needing a symbolic link.