Re: [PATCH 2/3] [RFC] seccomp: give BPF x32 bit when restoring x32 filter

On Thursday, July 10, 2014 09:06:02 PM H. Peter Anvin wrote: > Incidentally: do seccomp users know that on an x86-64 system you can > recevie system calls from any of the x86 architectures, regardless of > how the program is invoked? (This is unusual, so normally denying those > "alien" calls is the right thing to do.) I obviously can't speak for all seccomp users, but libseccomp handles this by checking the seccomp_data->arch value at the start of the filter and killing (by default) any non-native architectures. If you want, you can change this default behavior or add support for other architectures (e.g. create a filter that allows both x86-64 and x32 but disallows x86, or any combination of the three for that matter).