Existing scripts and associated config such as rc.initdiskless, rc.d/var,
and others, use mdmfs to create memory filesystems. That program accepts a
size argument which allows SI suffixes and treats an unsuffixed number as a
count of 512 byte sectors. That makes it difficult to convert existing
scripts to use tmpfs instead of mdmfs, because tmpfs treats unsuffixed
numbers as a count of bytes. The script logic to deal with existing user
config that might include suffixed and unsuffixed numbers is... unpleasant.
Also, there is no g'tee that tmpfs will be available. It is sometimes
configured out of small-resource embedded systems to save memory and flash
storage space.
These changes enhance mdmfs(8) so that it accepts two new values for the
'md-device' arg: 'tmpfs' and 'auto'. With tmpfs, the program always uses
tmpfs(5) (and fails if it's not available). With 'auto' the program prefers
tmpfs, but falls back to using md(4) if tmpfs isn't available. It also
handles the -s <size> argument so that the mdconfig interpetation of
unsuffixed numbers applies when tmpfs is used as well, so that existing user
config keeps working after a switch to tmpfs.
A new rc setting, mfs_type, is added to etc/defaults/rc.conf to let users
force the use of tmpfs or md; the default value is "auto".
Differential Revision: https://reviews.freebsd.org/D12301
The GCC xmmintrin.h header brokenly includes mm_malloc.h unconditionally.
(The Clang version of xmmintrin.h only includes mm_malloc.h if not compiling
in standalone mode.)
Hack around GCC's broken header by defining the include guard macro ahead of
including xmmintrin.h.
Reported by: lwhsu, jhb
Tested by: lwhsu
Sponsored by: Dell EMC Isilon
Also fix the style of the asprintf(3) call in __collate_load_tables_l().
Both of these lines were modified away from snprintf(3) during the
import from DragonFly/Illumos.
Reviewed by: jilles (briefly over shoulder)
MFC after: 2 weeks
Sponsored by: Dell EMC Isilon
smb_strdupin() tried to roll a copyin() based strlen to allocate a buffer
and then blindly copyin that size. Of course, a malicious user program
could simultaneously manipulate the buffer, resulting in a non-terminated
string being copied.
Later assumptions in the code rely upon the string being nul-terminated.
Just use copyinstr() and drop the racy sizing.
PR: 222687
Reported by: Meng Xu <meng.xu AT gatech.edu>
Security: possible local DoS
Sponsored by: Dell EMC Isilon
This reduce the spam a user may face when mandoc tries to
figure out if it can renders a manpage or fallback on groff(1)
Reported by: bdrewery
MFC after: 3 days
Add flag to the makefile to allow loader compilation as
Little-Endian 32-bit executable.
Usage:
make WITH_LOADER_FORCE_LE=yes -C sys/boot all
Submitted by: Wojciech Macek <wma@freebsd.org>
Reviewed by: imp, nwhitehorn
Obtained from: Semihalf
Sponsored by: QCM Technologies
Differential revision: https://reviews.freebsd.org/D12421
* check mbuf length before doing mtod() and accessing to IP header;
* update oip pointer and all depending pointers after m_pullup();
* remove extra checks and extra parentheses, wrap long lines;
PR: 222670
Reported by: Prabhakar Lakhera
MFC after: 1 week
needed, but it silences an erroneous Coverity warning and makes the code a
little more logically consistent. Also mark the sysctl as MPSAFE.
Sponsored by: Netflix
This patch adds a NFSSTA_FLEXFILE flag that will be used to enable
Flexible File Layout for the NFSv4.1 pNFS client. It is not yet
used, but will be after a future commit adds Flex File Layout support.
This patch changes nfsv4_getipaddr() and nfsrpc_fillsa() to use
a sockaddr_in * and sockaddr_in6 * instead of sockaddr_storage, to
avoid allocating the latter on the stack. It also moves the nfsrpc_fillsa()
call to after the completion of parsing of the DeviceInfo reply from
the server. This patch is in preparation for addition of Flex File
Layout support in a future commit.
It only affects the "pnfs" NFSv4.1 client mount option and should not
have changed its semantics.
Defining a variable with the description and then only use it in the
SYSCTL declaration led to an unused variable warning. In the SYSCTL the
passed value is discarded using __DESCR.
pmap_remove_all(). If the object to which a page belongs has no
references, then that page cannot possibly be mapped.
Reviewed by: kib
MFC after: 1 week
Split the handlers for pop of invalid selectors from the trap frame
into usermode and kernel variants. Usermode handler is kept as is, it
restores the already loaded parts of the trap frame and jumps to set
up a signal delivery to the user process.
New kernel part of the handler emulates IRET treatment of the segments
which would violate access right. It loads NUL selector in the
segment register which load causes the fault, and then continues the
return to interrupted kernel code. Since invalid selectors in the
segment registers in the kernel mode can only exist while kernel still
enters or exits from userspace, we only zero invalid userspace
selectors. If userspace tries to use the segment register, it gets a
signal, as if the processor segment descriptor cache was reloaded.
Reported by: Maxime Villard <max@m00nbsd.net>
Suggested and reviewed by: bde
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Do not return from interrupt using the POP_FRAME;iret instruction
sequence, always jump to doreti.
The user segments selectors saved on the stack might become invalid
because userspace manipulated LDT in a parallel thread. trap() is
aware of such issue, but it is only prepared to handle it at iret and
segment registers load operations in doreti path.
Also remove POP_FRAME macro because it is no longer used.
Reviewed by: bde, jhb (as part of r323722)
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
some still useful bits of the reverted revision.
The problem with the committed fix is that there are still issues with
returning from NMI, when NMI interrupted kernel in a moment where the
kernel segments selectors were still not loaded into registers. If
this happens, the NMI return would loose the userspace selectors
because r323722 does not reload segment registers on return to kernel
mode.
Fixing the problem is complicated. Since an alternative approach to
handle the original bug exists, it makes sence to stop adding more
complexity.
Discussed with: bde
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Use xpt_done_direct in preference to xpt_done when completing a
successful I/O. Continue to use xpt_done when there's an error, or for
completion of the submission of a CCB. This eliminates a context
switch to the cam_doneq thread.
Sponsored by: Netflix
Suggested by: scottl@
When a "pnfs" NFSv4.1 mount was unmounted, it didn't free up the layouts
and deviceinfo structures. This leak only affects "pnfs" mounts and only
when the mount is umounted.
Found while testing the pNFS Flexible File layout client code.
MFC after: 2 weeks
This fixes kernel crashes due to misaligned accesses to the 64-bit
time_t embedded in struct namecache_ts in MIPS n32 kernels.
MFC after: 1 week
Sponsored by: DARPA / AFRL
This is a wrapper around _Alignof() that sets the alignment for a zone
to the alignment required by a given type. This allows the compiler to
determine the proper alignment rather than having the programmer try to
guess.
Discussed on: arch@
MFC after: 1 week
Sponsored by: DARPA / AFRL
parser.
This allows us to use the EROM parser API in cases where the standard bus
space I/O APIs are unsuitable. In particular, this will allow us to parse
the device enumeration table directly from bhndb(4) drivers, prior to
full attach and configuration of the bridge.
Approved by: adrian (mentor)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D12510
Add bhnd(4) API for explicitly registering BHND platform devices (ChipCommon,
PMU, NVRAM, etc) with the bus, rather than walking the newbus hierarchy to
discover platform devices. These devices are now also refcounted; attempting
to deregister an actively used platform device will return EBUSY.
This resolves a lock ordering incompatibility with bwn(4)'s firmware loading
threads; previously it was necessary to acquire Giant to protect newbus access
when locating and querying the NVRAM device.
Approved by: adrian (mentor)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D12392
If the filesystem is not exported directly return NULL.
If no address is given and filesystem is exported using some default
one return it directly, if it doesn't have a default one directly
return NULL.
Reviewed by: kib, bapt
MFC after: 1 week
Sponsored by: Gandi.net
Differential Revision: https://reviews.freebsd.org/D12505
Add comment to explain the IPV6_EX suffix. The confusion about
these RSS hash type probably stems from the facts that they were
never widely implemented by hardwares.
Reviewed by: rwatson
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D12453
IPV6_EXs in RSS never mean fragment. They mean:
"- Home address from the home address option in the IPv6 destination
options header. If the extension header is not present, use the
Source IPv6 Address.
- IPv6 address that is contained in the Routing-Header-Type-2 from
the associated extension header. If the extension header is not
present, use the Destination IPv6 Address."
UDP_IPV4_EX is an invalid RSS hash type, which will be removed.
Quoted from:
https://docs.microsoft.com/en-us/windows-hardware/drivers/network/rss-hashing-types#ndishashipv6ex
Reviewed by: erj
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D12450
_NO_ OSes actually "negotiate" MSS.
RFC 879:
"... This Maximum Segment Size (MSS) announcement (often mistakenly
called a negotiation) ..."
This negotiation behaviour was introduced 11 years ago by r159955
without any explaination about why FreeBSD had to "negotiate" MSS:
In syncache_respond() do not reply with a MSS that is larger than what
the peer announced to us but make it at least tcp_minmss in size.
Sponsored by: TCP/IP Optimization Fundraise 2005
The tcp_minmss behaviour is still kept.
Syncookie fix was prodded by tuexen, who also helped to test this
patch w/ packetdrill.
Reviewed by: tuexen, karels, bz (previous version)
MFC after: 2 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D12430
UDP checksum offload does not work in Azure if following conditions are
met:
- sizeof(IP hdr + UDP hdr + payload) > 1420.
- IP_DF is not set in IP hdr
Use software checksum for UDP datagrams falling into this category.
Add two tunables to disable UDP/IPv4 and UDP/IPv6 checksum offload, in
case something unexpected happened.
MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D12429
Said checks were inherently racy anyway as jokers could unmap target areas
before the handler got around to accessing them.
This saves time by avoiding locking the address space.
MFC after: 1 week
It was supposed to provide a recovery mechanism against bugs in procfs's
long deprecated tracing capabilities.
Remove the tool as a prerequisite to axing the kernel side.
The tracing facility to use is ptrace(2).
MFC after: 2 weeks
tid must be equal to curthread and the target routine was already reading
it anyway, which is not a problem. Not passing it as a parameter allows for
a little bit shorter code in callers.
MFC after: 1 week
This patch adds "vers" and "minorvers" arguments to nfscl_reqstart().
The patch always passes them in as "0" and that implies no change
in semantics. These arguments will be used by a future commit that
adds support for the Flexible File Layout.
Normally wakeups() are performed for completed softupdates work items
in workitem_free() before the underlying memory is free()'d.
complete_jseg() was clearing the "wakeup needed" flag in work items to
defer the wakeup until the end of each loop iteration. However, this
resulted in the item being free'd before it's address was used with
wakeup(). As a result, another part of the kernel could allocate this
memory from malloc() and use it as a wait channel for a different
"event" with a different lock. This triggered an assertion failure
when the lock passed to sleepq_add() did not match the existing lock
associated with the sleep queue. Fix this by removing the code to
defer the wakeup in complete_jseg() allowing the wakeup to occur
slightly earlier in workitem_free() before free() is called.
The main reason I can think of for deferring a wakeup() would be to
avoid waking up a waiter while holding a lock that the waiter would
need. However, no locks are dropped in between the wakeup() in
workitem_free() and the end of the loop in complete_jseg() as far as I
can tell.
In general I think it is not safe to do a wakeup() after free() as one
cannot control how other parts of the kernel that might reuse the
address for a different wait channel will handle spurious wakeups.
Reported by: pho
Reviewed by: kib
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D12494
