[Qemu-block] [PATCH v2 03/18] tests/vm/openbsd: Disable the W^X protection on the build partition

[Philippe Mathieu-Daudé]

Since OpenBSD 6.0 [1], W^X is enforced by default [2].
TCG requires WX access, and QEMU binaries are now built with the WX
flag to disable the protection. However, WX allowed binaries need
to be run on a WX allowed partition.
To be able to run the QEMU test suite on the VM, mount the partition
where QEMU is built/tested as WX allowed.

[1] https://www.openbsd.org/faq/upgrade60.html
[2] https://undeadly.org/cgi?action=article&sid=20160527203200

Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
---
 tests/vm/openbsd | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tests/vm/openbsd b/tests/vm/openbsd
index 2105c01a26..6263c8956b 100755
--- a/tests/vm/openbsd
+++ b/tests/vm/openbsd
@@ -41,6 +41,12 @@ class OpenBSDVM(basevm.BaseVM):
         if os.path.exists(img):
             os.remove(img)
         os.rename(img_tmp, img)
+        self.boot(img)
+        self.wait_ssh()
+        sys.stderr.write("Disabling W^X on the build partition...\n")
+        self.ssh_root_check("sed -E -i 's_(/tmp\ ffs)\ ([^\ ]*)_\\1 
\\2,wxallowed_' /etc/fstab")
+        self.ssh_root("shutdown -p now")
+        self.wait()
 
 if __name__ == "__main__":
     sys.exit(basevm.main(OpenBSDVM))
-- 
2.20.1