seccomp: test SECCOMP_USER_NOTIF_FLAG_CONTINUE

Test whether a syscall can be performed after having been intercepted by
the seccomp notifier. The test uses dup() and kcmp() since it allows us to
nicely test whether the dup() syscall actually succeeded by comparing whether
the fds refer to the same underlying struct file.

Signed-off-by: Christian Brauner <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Will Drewry <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: Martin KaFai Lau <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Yonghong Song <[email protected]>
Cc: Tycho Andersen <[email protected]>
CC: Tyler Hicks <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>

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