Suppose my non-root 32-bit app runs on a 64-bit system, all filesystems of which are mounted as read-only. The app creates an image of a 64-bit ELF in memory. But due to read-only filesystems it can't dump this image to a file to do an execve on. Is there still a supported way to launch a process from this image?Note: the main problem here is to switch from 32-bit mode to 64-bit, not doing any potentially unreliable hacks. If this is solved, then the whole issue becomes trivial  just make a custom loader.
Can I exec an entirely new process without an executable file?
linux;process;exec