This code dates back to the very first diskless support on FreeBSD,
back when swapon(8) couldn't simply be run on a NFS backed file.
Suggested replacement command sequence on the client:
dd if=/dev/zero of=/swapfile bs=1k count=1 oseek=100000
swapon /swapfile
rm -f /swapfile
For whatever value of 100000 you want.
Minor code reorganization was required, but the only functional
change was that the first 1024 bytes of output are thrown out
after each reseed, rather than just the initial seed.
was masked. However KIMURA Yasuhiro-san noticed my mistake and was
kind enough to provide a better patch in PR 55581. I've merged that
into the routine. Hopefully I've not overlooked anything this time.
MFC After: 5 days
that were on the kernel stack into account. For now we write them
out to the register stack of the process before creating the dump.
This however is not the final solution. The problem is that we may
invalidate the coredump by overwriting vital information due to an
invalid backing store pointer. Instead we need to write the dirty
registers to an unused region of VM which will result in a seperate
segment in the coredump. For now we can at least get to all the
registers from a coredump.
and the move to control register to avoid dependency violations when
these functions are used. Note that explicit data and instruction
serialization also need to be in a subsequent instruction group.
This too requires that we have an igrp break here.
PT_SETKSTACK. These requests allow the tracing process to access the
dirty registers of the traced process that are on the kernel stack.
Note that there's currently no way to access the rnat register for
those dirty registers that are not (yet) covered by a nat collection
point. The interface for this is still being slept on.
Also note that implied by these requests is the division of work:
The tracing process has to keep track of where registers are spilled
and is responsible to figure out where the NaT bit of the stacked
registers are at any time during the execution of the traced process.
The kernel provides the interfaces but will not abstract the fact
that the register stack can be split. This model does not follow
the approach taken in Linux where PT_PEEK and PT_POKE deals with
this automagically.
check for permissions, do it for all requests, not the known requests.
Later when we actually service the request we deal with the invalid
requests we previously caught earlier.
This commit changes the behaviour of the ptrace(2) interface for
boundary cases such as an unknown request without proper permissions.
Previously we would return EINVAL. Now we return EBUSY or EPERM.
Platforms need to define __HAVE_PTRACE_MACHDEP when they have MD
requests. This makes the prototype of cpu_ptrace() visible and
introduces a call to this function for all requests greater or
equal to PT_FIRSTMACH.
Silence on: audit
Correctly handle additional disks without BIOS partition tables.
Previously, vinum_scandisk stopped scanning additional disks for
native partitions after any good partition was found. This applies
to all platforms, but was a particular problem on systems without
BIOS partition tables.
Submitted by: harti
the hardware mutex if it is held. Re-add calls to Enable/Clear fixed events.
This is not known to have caused problems. Bug symptoms might have included
instability after an aborted suspend attempt or power/sleep buttons not
being enabled.
kobj global method table; also kassert that the table has not overflowed
when defining a new method.
there are indications that the table is being overflowed in certain
situations as we gain more kobj consumers- this will allow us to check
whether kobj is at fault. symptoms would be incorrect methods being called.
CP-168U board. It initializes and attaches in the same way as the
older (but higher performance) C168H. The only difference is the
board ID, which is 0x1681.
PR: kern/53548
Submitted by: regnauld@catpipe.net
MFC after: 1 week
the Palm device and the USB host controller deadlock. The USB host
controller is expecting an early-end-of-transmission packet with 0
data, and the Palm doesn't send one because it's already communicated
the amount of data it's going to send in a header (which ucom/uvisor
are oblivious to). This is the problem that has been known on the
pilot-link lists as the "[Free]BSD USB problem", but not understood.
Submitted by: Nathan J. Williams <nathanw@MIT.EDU>
multi-fragment transmission. I'm not sure if this is a bug or a requirement
that I overlooked with going through the documentation, but the sample
8169 NIC that I have seems to require it at least some of the time or
else it botches TCP checksums on segments that span multiple descriptors.
to override the method pointers for manipulating nodes; this fixes
a problem where the ic_bss node was not being created properly
for the ath driver causing the driver to scribble on random memory.
Noticed by: David Young <dyoung@pobox.com>
rate set element id from an AP. This allows stations to associate with
AP's that violate the 802.11 spec by sending >8 rates. This corrects a
recent regression; older code did likewise.
for partly-aligned operations through /dev/crypto (unlikely)
o add missing case in iov code that never showed up because of the above bug
Submitted by: "Jason L. Wright" <jason@thought.net>
MFC after: 3 days
to walk the list and remove the current item and destroy/free it.
Alexander Kabaev will likely do the equivalent for the other list
types, but I just happened to have this one sitting in a local
non-FreeBSD tree already.
segments are lost for the application. This broke, for example,
ports/benchmarks/dbs which needs the SYN segment to filter the
contents of the trace buffer for the connection it is interested in.
This patch makes the SYN segments available again. Unfortunately they
are now associated with the listening socket instead of the new one, so
a change to applications is required, but without this patch it wouldn't
work altogether.
PR: kern/45966
code has rotten a bit so that the header length is not correct at
the point when tcp_trace is called. Temporarily compute the correct
value before the call and restore the old value after. This makes
ports/benchmarks/dbs to almost work.
This is a NOP unless you compile with TCPDEBUG.
in tcp_input that leave the function before hitting the tcp_trace
function call for the TCPDEBUG option. This has made TCPDEBUG mostly
useless (and tools like ports/benchmarks/dbs not working). Add
tcp_trace calls to the return paths that could be identified in this
maze.
This is a NOP unless you compile with TCPDEBUG.
in user space or kernel space. VM_MIN_KERNEL_ADDRESS starts after the
gateway page, which means that improper memory accesses to the gateway
page while in user mode would panic the kernel. Use VM_MAX_ADDRESS
instead. It ends before the gateway page. The difference between
VM_MIN_KERNEL_ADDRESS and VM_MAX_ADDRESS is exactly the gateway page.
move to ar.rsc. The RSE must be in enforced lazy mode when writing
to RSE modifyable registers. In this case we restore the RSE NaT
collection register ar.rnat. I have seen 2 general exception faults
on pluto1 now that indicate that the move to ar.rsc has already
happened prior to the move to ar.rnat, meaning that the RSE is not
in enforced lazy mode anymore. The ia64 dependency and instruction
ordering rules seem to allow having both registers written to in
the same instruction group, provided ar.rsc is written to later than
ar.rnat (based on the ordering semantics). It appears that we may
be pushing our luck. For now, put them in seperate cycles (by means
of the instruction group break). If we ever get a general exception
fault on the move to ar.rnat again, we have definite proof that
something else is fishy.
