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tests: Add ktrace regression test for shm_open
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Authored by jfree on Apr 10 2024, 1:19 AM.
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rGa94eacb13977: tests: Add ktrace regression test for shm_open
rG054a4720591f: tests: Add ktrace regression test for shm_open
Summary

Verify that a capability violation is recorded when shm_open(2) is called
with a non-anonymous path.

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rG FreeBSD src repository
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sys/
kern/
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tests/sys/kern/ktrace_test.c

.\" .\"
.Dd September 28, 2023 .Dd December 14, 2023
.Dt IPFW 8 .Dt IPFW 8
.Os .Os
.Sh NAME .Sh NAME
.Nm ipfw , dnctl .Nm ipfw , dnctl
.Nd User interface for firewall, traffic shaper, packet scheduler, .Nd User interface for firewall, traffic shaper, packet scheduler,
in-kernel NAT. in-kernel NAT.
.Sh SYNOPSIS .Sh SYNOPSIS
.Ss FIREWALL CONFIGURATION .Ss FIREWALL CONFIGURATION
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is normally reported to the caller routine in the kernel, in the is normally reported to the caller routine in the kernel, in the
same way as it happens when a device queue fills up. same way as it happens when a device queue fills up.
Setting this Setting this
option reports the packet as successfully delivered, which can be option reports the packet as successfully delivered, which can be
needed for some experimental setups where you want to simulate needed for some experimental setups where you want to simulate
loss or congestion at a remote router. loss or congestion at a remote router.
.Pp .Pp
.It Cm plr Ar packet-loss-rate .It Cm plr Ar packet-loss-rate
.It Cm plr Ar K,p,H,r
Packet loss rate. Packet loss rate.
Argument Argument
.Ar packet-loss-rate .Ar packet-loss-rate
is a floating-point number between 0 and 1, with 0 meaning no is a floating-point number between 0 and 1, with 0 meaning no
loss, 1 meaning 100% loss. loss, 1 meaning 100% loss.
The loss rate is internally represented on 31 bits. .Pp
When invoked with four arguments, the simple Gilbert-Elliott
channel model with two states (Good and Bad) is used.
.Bd -literal -offset indent
r
.----------------.
v |
.------------. .------------.
| G | | B |
| drop (K) | | drop (H) |
'------------' '------------'
| ^
'----------------'
p
.Ed
This has the associated probabilities
.Po Ar K
and
.Ar H Pc
for the loss probability. This is different from the literature,
where this model is described with probabilities of successful
transmission k and h. However, converting from literature is
easy:
.Pp
K = 1 - k ; H = 1 - h
.Pp
This is to retain consistency within the interface and allow the
quick re-use of loss probability when giving only a single argument.
In addition the state change probabilities
.Po Ar p
and
.Ar r Pc
are given.
All of the above probabilities are internally represented on 31 bits.
.Pp .Pp
.It Cm queue Brq Ar slots | size Ns Cm Kbytes .It Cm queue Brq Ar slots | size Ns Cm Kbytes
pauamma_gundo.comUnsubmitted
Done
Inline Actions

Worth being explicit that these arguments are comma-separated and mention their internal representation if relevant?

pauamma_gundo.com: Worth being explicit that these arguments are comma-separated and mention their internal…
rscheffAuthorUnsubmitted
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Ideally, I wanted to have the parameters in loss probabilities; the literature of the gilbert-elliott model give these (k, h) as transmission probabilities - the inverse of what the simple PLR loss probability is;
Adjusted the code accordingly.
Alternatively, I could call these parameters K and H, with K = (1-k) and H = (1-h), keep the code more streamlined and the probabilities would align nicely with the simple PLR loss model...

Any opinions?

rscheff: Ideally, I wanted to have the parameters in loss probabilities; the literature of the gilbert…
pauamma_gundo.comUnsubmitted
Not Done
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I have no basis for an informed opinion on that point myself.

pauamma_gundo.com: I have no basis for an informed opinion on that point myself.
Queue size, in Queue size, in
.Ar slots .Ar slots
or or
.Cm KBytes . .Cm KBytes .
Default value is 50 slots, which Default value is 50 slots, which
is the typical queue size for Ethernet devices. is the typical queue size for Ethernet devices.
Note that for slow speed links you should keep the queue Note that for slow speed links you should keep the queue
size short or your traffic might be affected by a significant size short or your traffic might be affected by a significant
queueing delay. queueing delay.
pauamma_gundo.comUnsubmitted
Done
Inline Actions
.Po Ar change-to-B
and
- .Ar change-to-A Pc
+ .Ar change-to-G Pc
.
.Pp
.It Cm queue Brq Ar slots | size Ns Cm Kbytes

Or explain what A is.

pauamma_gundo.com: Or explain what A is.
E.g., 50 max-sized Ethernet packets (1500 bytes) mean 600Kbit E.g., 50 max-sized Ethernet packets (1500 bytes) mean 600Kbit
or 20s of queue on a 30Kbit/s pipe. or 20s of queue on a 30Kbit/s pipe.
Even worse effects can result if you get packets from an Even worse effects can result if you get packets from an
interface with a much larger MTU, e.g.\& the loopback interface interface with a much larger MTU, e.g.\& the loopback interface
with its 16KB packets. with its 16KB packets.
The The
.Xr sysctl 8 .Xr sysctl 8
variables variables
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