I discovered that my version of Chromium (Version 29.0.1547.57 Debian 7.1 (217859)) does not have all the sandbox features turned on by default. Navigating to chrome://sandbox/ gives results:
Sandbox Status
SUID Sandbox Yes
PID name spaces Yes
Network namespaces Yes
Seccomp-BPF sandbox No
You are not adequately sandboxed!
Can I turn on the Seccomp-BPF sandbox? My OS stats are:
$ uname -a
Linux compname 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1+deb7u1 x86_64 GNU/Linux
And since I have uninstalled my desktop manager, I normally start Chromium from the commandline like so:
nohup chromium >> /tmp/chromium.nohupout &
However, I have also tried starting Chromium with the --enable-seccomp-sandbox flag, and the sandbox still remains off. When I do this, I get the warning message in stderr:
ATTENTION: default value of option force_s3tc_enable overridden by environment.
Solutions which do not involve me recompiling chromium from source are preferable.