sanity.bbclass: handle lack of permission to read /proc/sys/vm/mmap_min_addr

Patch from OE.dev by Martin Jansa to workaround that we on modern Linux we can
no longer read this file.

We need a better fix but best option will be to update to a newer, relocatable,
QEMU release.

Signed-off-by: Joshua Lock <josh@linux.intel.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/meta/classes/sanity.bbclass b/meta/classes/sanity.bbclass
index c2f57a3837..67a5f52de3 100644
--- a/meta/classes/sanity.bbclass
+++ b/meta/classes/sanity.bbclass
@@ -95,11 +95,15 @@ def check_sanity(e):
                         messages = messages + "qemu-native was in ASSUME_PROVIDED but the QEMU binaries (qemu-arm) can't be found in PATH"
 
         if data.getVar('TARGET_ARCH', e.data, True) == "arm":
-                if os.path.exists("/proc/sys/vm/mmap_min_addr"):
-                        f = file("/proc/sys/vm/mmap_min_addr", "r")
-                        if (f.read().strip() != "0"):
-                                messages = messages + "/proc/sys/vm/mmap_min_addr is not 0. This will cause problems with qemu so please fix the value (as root).\n\nTo fix this in later reboots, set vm.mmap_min_addr = 0 in /etc/sysctl.conf.\n"
-                        f.close()
+                # This path is no longer user-readable in modern (very recent) Linux
+                try:
+                        if os.path.exists("/proc/sys/vm/mmap_min_addr"):
+                                f = file("/proc/sys/vm/mmap_min_addr", "r")
+                                if (f.read().strip() != "0"):
+                                        messages = messages + "/proc/sys/vm/mmap_min_addr is not 0. This will cause problems with qemu so please fix the value (as root).\n\nTo fix this in later reboots, set vm.mmap_min_addr = 0 in /etc/sysctl.conf.\n"
+                                f.close()
+                except:
+                        pass
 
         for util in required_utilities.split():
                 if not check_app_exists( util, e.data ):