Stop single stepping in signal handers on arm64

We should clear the single step flag when entering a signal hander and
set it when returning. This fixes the ptrace__PT_STEP_with_signal test.

While

Stop single stepping in signal handers on arm64

We should clear the single step flag when entering a signal hander and
set it when returning. This fixes the ptrace__PT_STEP_with_signal test.

While here add support for userspace to set the single step bit as on
x86. This can be used by userspace for self tracing.

Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34170

(cherry picked from commit 31cf95cec738bdb51a652689e2f829addc3b984b)

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ktls: Disallow transmitting empty frames outside of TLS 1.0/CBC mode

There was nothing preventing one from sending an empty fragment on an
arbitrary KTLS TX-enabled socket, but ktls_frame() asserts

ktls: Disallow transmitting empty frames outside of TLS 1.0/CBC mode

There was nothing preventing one from sending an empty fragment on an
arbitrary KTLS TX-enabled socket, but ktls_frame() asserts that this
could not happen. Though the transmit path handles this case for TLS
1.0 with AES-CBC, we should be strict and allow empty fragments only in
modes where it is explicitly allowed.

Modify sosend_generic() to reject writes to a KTLS-enabled socket if the
number of data bytes is zero, so that userspace cannot trigger the
aforementioned assertion.

Add regression tests to exercise this case.

Reported by: syzkaller
Reviewed by: gallatin, jhb
Sponsored by: The FreeBSD Foundation

(cherry picked from commit 5de79eeddb9de079d108d1312148bcbefce45c27)

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tests: add a basic test for argc == 0

The kernel should reject such exec()s now, early on. Instead of adding
the needed boilerplate to write a test in C, just add an -n argument for
"(n)ull argv" to

tests: add a basic test for argc == 0

The kernel should reject such exec()s now, early on. Instead of adding
the needed boilerplate to write a test in C, just add an -n argument for
"(n)ull argv" to the execve helper and exec this other helper that just
exits silently with argv count.

(cherry picked from commit e5b431fc0c20771a2a18cb5169d75cf337d0f1dd)

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tests: Add some regression tests for a couple of KERN_PROC_* sysctls

Sponsored by: The FreeBSD Foundation

(cherry picked from commit fff0ae77b9960bb26034297fcb885d26432354bf)

ktls: Add a regression test to exercise socket error handling

Prior to commit 916c61a5ed37 ("Fix handling of errors from
pru_send(PRUS_NOTREADY)") this test triggered a kernel panic due to an
mbuf d

ktls: Add a regression test to exercise socket error handling

Prior to commit 916c61a5ed37 ("Fix handling of errors from
pru_send(PRUS_NOTREADY)") this test triggered a kernel panic due to an
mbuf double free.

Reviewed by: jhb
Sponsored by: The FreeBSD Foundation

(cherry picked from commit ee5686c614ba7e11e8586b2e5b02dfc550679e96)

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