How to compile .so for Android O without Writable and Executable Segments? How to set specific ELF permissions?

Question

https://android.googlesource.com/platform/bionic/+/master/android-changes-for-ndk-developers.md#Writable-and-Executable-Segments-Enforced-for-API-level-26

Currently Andr

Answer 1

The GNU toolchains and the Android toolchains have been doing the right thing for a long, long time now. You can use the readelf/grep command in the article:

$ readelf --program-headers -W libBadFlags.so | grep WE

If there is no output, you should be fine. If there is output, you need to track down the source of the writable/executable mapping. For a GNU_STACK header, it is likely an assembler file with a missing annotation (a mere oversight). But much more obscure things are possible, so there is no generic solution.

But in most cases, no changes to your project should be needed.