[Bug 3702] sshd fork crashed when compiled with seccomp

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3702

--- Comment #4 from Darren Tucker <dtucker at dtucker.net> ---
If you've built with -DSANDBOX_SECCOMP_FILTER_DEBUG you should get a
debug line like this:

    ssh_sandbox_violation: unexpected system call
(arch:0xc000003e,syscall:271 @ 0x7f84be11dc3b) [preauth]

If you're building the current devel version you'll need to either
install sshd-session where sshd expects it or specify the one in your
build directory:

    $ make && sudo `pwd`/sshd -De -ologlevel=debug3 -p 2022
-osshdsessionpath=`pwd`/sshd-session

One other thing: you can ask the compiler to dump the syscall numbers
for you:

    $ cc -dD -E -I. sandbox-seccomp-filter.c | grep '#define __NR'

(As an aside, tt'd be nice if the debugging code could do this for us.)
 On my Armbian system this says 20 is epoll:

#define __NR_epoll_create1 20
#define __NR_epoll_ctl 21
#define __NR_epoll_pwait 22

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