RT2860_WCID_MAX is supposed to describe the max STA index for wcid2ni, and
was instead being used as the size -- off-by-one.
rt2860_drain_stats_fifo was range-checking wcid only after accessing
out-of-bounds potentially.
Submitted by: Augustin Cavalier <waddlesplash@gmail.com> (basically)
Obtained from: Haiku (58d16d9fe2d5a209cf22823359a8407d138e1a87)
Differential Revision: 3 days
hash was computed and the time that the superblock was copied to a
buffer to be written to disk. The result was a failed superblock
check hash the next time that the superblock was read.
The fix is to compute the check hash after the superblock has been
copied to a buffer to be written.
PR: 236504
Reported by: Peter Holm
Tested by: Peter Holm
Sponsored by: Netflix
Previously the ICMPv6 input path incorrectly handled cases where an
MLDv2 listener query packet was internally fragmented across multiple
mbufs.
admbugs: 921
Submitted by: jtl
Reported by: CJD of Apple
Approved by: so
MFC after: 0 minutes
Security: CVE-2019-5608
Such speculations could use user-controlled %gs base, esp. since
FreeBSD supports WRGSBASE instructions.
Place LFENCEs on entry for each basic block after the test for
previous kernel/user mode on the kernel entry, which prevents the
speculation. Code accesses %gs-based PCPU before any serialization
instructions are executed, like %cr3 reload for KPTI.
With pti disabled, on haswell i7-4770S machine, "syscall_timings getppid"
shows when no lfence is added to syscall path:
test loop time iterations periteration
getppid 0 1.040918865 4643611 0.000000224
getppid 1 1.004985962 4481816 0.000000224
getppid 2 1.005196483 4482363 0.000000224
with lfence:
getppid 0 1.043701091 4554779 0.000000229
getppid 1 1.016930328 4438094 0.000000229
getppid 2 1.023223117 4466640 0.000000229
and ministat reports 'No difference proven at 95.0% confidence.'
Security: CVE-2019-1125
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
There is no need for the 64-bit pmap to have a fixed number of page table
buffers. Since the 64-bit pmap has a DMAP, we can effectively have user
page tables limited only by total RAM size.
We don't need to check if the parent is already set.
This is done already in the proc_reparent.
No functional behaviour changes intended.
MFC after: 1 month
The process is reparented to the debugger while it is attached.
B B
/ ----> |
A A D
Every time when the process is reparented, it is added to the orphan list
of the previous parent:
A->orphan = B
D->orphan = NULL
When the A process will close the process descriptor to the B process,
the B process will be reparented to the init process.
B B - init
| ---->
A D A D
A->orphan = B
D->orphan = B
In this scenario, the B process is in the orphan list of A and D.
When the last process descriptor is closed instead of reparenting
it to the reaper let it stay with the debugger process and set
our previews parent to the reaper.
Add test case for this situation.
Notice that without this patch the kernel will crash with this test case:
panic: orphan 0xfffff8000e990530 of 0xfffff8000e990000 has unexpected oppid 1
Reviewed by: markj, kib
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D20361
In case of the process being debugged. The P_TRACED is cleared very early,
which would make procdesc_close() not calling proc_clear_orphan().
That would result in the debugged process can not be able to collect
status of the process with process descriptor.
Reviewed by: markj, kib
Tested by: pho
MFC after: 1 month
NVMe reservations are quite alike to SCSI persistent reservations and
can be used in clustered setups with shared multiport storage.
MFC after: 10 days
Relnotes: yes
Sponsored by: iXsystems, Inc.
Instances of the device can be configured using hints or FDT data.
Interfaces to reconfigure the chip and extract voltage measurements from
it are available via sysctl(8).
The hash buckets array is called ip6q. The data structure ip6q is a
description of different object, the one the array holds these days
(since r337776). To clear some of this confusion, rename the array
to ip6qb.
When iterating over all buckets or addressing them directly, we
use at least the variables i, hash, and bucket. To keep the
terminology consistent use the variable name "bucket" and always
make it an uint32_t and not sometimes an int.
No functional behaviour changes intended.
MFC after: 3 months
Sponsored by: Netflix
Re-order functions within the file in preparation for an upcoming
code simplification.
No functional changes.
MFC after: 3 months
Sponsored by: Netflix
The last few changes needed before 32-bit AIM builds with secure-PLT with
base GCC. Because ofwcall32.S and swtch32.S were branching to the GOT it
could not use secure PLT.
PowerPC, and possibly other architectures, use different address ranges for
PCI space vs physical address space, which is only mapped at resource
activation time, when the BAR gets written. The DRM kernel modules do not
activate the rman resources, soas not to waste KVA, instead only mapping
parts of the PCI memory at a time. This introduces a
BUS_TRANSLATE_RESOURCE() method, implemented in the Open Firmware/FDT PCI
driver, to perform this necessary translation without activating the
resource.
In addition to system KPI changes, LinuxKPI is updated to handle a
big-endian host, by adding proper endian swaps to the I/O functions.
Submitted by: mmacy
Reported by: hselasky
Differential Revision: https://reviews.freebsd.org/D21096
The flag handling was committed commented out 7 years ago. It works, and is
needed for LinuxKPI-based DRM drivers.
Also mark a local as potentially unusable, as it's only really used when KTR
is enabled.
Submitted by: mmacy
When the ipfilter kld is loaded, used within VNET jail, and unloaded,
then subsequent loading, use, and unloading of another packet filters
will cause the subsequently loaded netpfil kld's to panic.
The scenario is as follows:
cd /usr/tests/sys/netpfil/common
kldunload ipl
kldunload pfsync
kldunload ipfw
kyua test pass_block
kldload ipl
kyua test pass_block
kldunload ipl
kldload pfsync
kyua test pass_block
kldunload pfsync
-- page fault panic occurs here --
Reported by: "Ahsan Barkati" <ahsanbarkati@g.....com> via kp@
Discussed with: kp@
Tested by: kp@
MFC after: 3 days
PTI-mode entry points were coded to set up the environment identical
to non-PTI entry and then fall-through to non-PTI handlers, mostly.
This has the drawback of requiring two more SWAPGS, first to access
PCPU, and then to return to the state expected by the non-PTI entry
point.
Eliminate the duplication by doing more in entry stubs both for PTI
and non-PTI, and adjusting the common code to expect that SWAPGS and
some minimal registers saving is done by entries.
Some less often used entries, in particular, #GP, #NP, and #SS, which
can fault on doreti, are left as is because there are basically four
variants of entrance, and they are not performance-critical,
esp. comparing with e.g. #PF or interrupts.
Reviewed by: markj (previous version)
Tested by: pho (previous version)
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
physical destination mode.
This is mostly a nop, because the vmm initializes all vCPUs up to
vm_maxcpus, so even if the target CPU is not active, lapic/vlapic code
still has the valid data to use. As John notes, dropping such
interrupts more closely matches the real harware, which ignores all
interrupts for not started APs.
Reviewed by: jhb
admbugs: 837
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Bring back systm.h after r350532 and banish errno.h, time.h, and
machine/atomic.h.
Reported by: bde (Thank you!)
Pointyhat to: bz
MFC after: 12 weeks
X-MFC: with r350532
Sponsored by: Netflix
Freeze clearing needs to heppen any time OPAL reads return either an error
(except OPAL_HARDWARE), AND any time it returns 0xff for all bytes.
For cfgwrite, any error that's not OPAL_HARDWARE should be cleaned up.
Previously, AcpiOsMemory was using pmap_mapbios which would always map
the requested address Write-Back (WB). For several AMD Ryzen laptops,
the BIOS uses AcpiOsMemory to directly access the PCI MCFG region in
order to access PCI config registers. This has the side effect of
remapping the MCFG region in the direct map as WB instead of UC
hanging the laptops during boot.
On the one laptop I examined in detail, the _PIC global method used to
switch from 8259A PICs to I/O APICs uses a pair of PCI config space
registers at offset 0x84 in the device at 0:0:0 to as a pair of
address/data registers to access an indirect register in the chipset
and clear a single bit to switch modes.
To fix, alter the semantics of pmap_mapbios() such that it does not
modify the attributes of any existing mappings and instead uses the
existing attributes. If a new mapping is created, this new mapping
uses WB (the default memory attribute).
Special thanks to the gentleman whose name I don't have who brought
two affected laptops to the hacker lounge at BSDCan. Direct access to
the affected systems permitted finding the root cause within an hour
or so.
PR: 231760, 236899
Reviewed by: kib, alc
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D20327
These vnodes are explicitly opened via VOP_OPEN via
exec_check_permissions identical to the main exectuable image.
Setting ISOPEN allows filesystems to perform suitable checks in
VOP_LOOKUP (e.g. close-to-open consistency in the NFS client).
Reviewed by: kib
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D21129
memory barrier between the stores for initializing a page table page and
the store for adding that page to the page table. Otherwise, a page table
walk by another processor's MMU could see the page table page before it
sees the initialized entries.
Simplify pmap_growkernel(). In particular, eliminate an unnecessary TLB
invalidation.
Reviewed by: andrew, markj
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D21126
In particular: Changed Namespace List, Commands Supported and Effects,
Reservation Notification, Sanitize Status.
Add few new arguments to `nvmecontrol log` subcommand.
MFC after: 2 weeks
Sponsored by: iXsystems, Inc.
Previously we would check for blessings before marking a given lock
pair as reversed, so each "reversed" lock acquisition would require
a linear scan of the table. Instead, check the table after marking
the pair as reversed but before generating a report.
Reviewed by: jhb
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D21135
