Compilation fails on GRSecurity/PaX kernel

Compilation seems to fail on a Linux kernel with GRSecurity/PaX patches, because the stage0 binary hasn't been marked with PaX flags, and for some reason that causes the whole process to hang, probably due PaX blocking it in some way.

I used paxctl -C to convert the binary to have PaX markings, and used paxctl -m to disable MEMEXEC protection on the rustc binary. However, this caused the stage1 binary to fail, for the same reason.

Used specifications:
Linux 2.6.39.2-grsec
gcc (Debian 4.6.2-11) 4.6.2
git commit 98c3396

[graydon]

If we sniff "being on a PaX system" during configure and mark the binaries when we build them, does that solve the problem?

Yes, that would probably fix it. The problems in that are however, 1) Detecting PaX, 2) Not all PaX systems have got paxctl installed, 3) You probably need root to do paxctl, which would mean you need root during the compiling.

[graydon]

This should be fixed now. Re-open if you find it still doesn't work.