Merge misc fixes from Andrew Morton:
- "fork: unconditionally clear stack on fork" is a non-bugfix which got
lost during the merge window - performance concerns appear to have
been adequately addressed.
- and a bunch of fixes
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
mm/filemap.c: fix NULL pointer in page_cache_tree_insert()
mm: memcg: add __GFP_NOWARN in __memcg_schedule_kmem_cache_create()
fs, elf: don't complain MAP_FIXED_NOREPLACE unless -EEXIST error
kexec_file: do not add extra alignment to efi memmap
proc: fix /proc/loadavg regression
proc: revalidate kernel thread inodes to root:root
autofs: mount point create should honour passed in mode
MAINTAINERS: add personal addresses for Sascha and Uwe
kasan: add no_sanitize attribute for clang builds
rapidio: fix rio_dma_transfer error handling
mm: enable thp migration for shmem thp
writeback: safer lock nesting
mm, pagemap: fix swap offset value for PMD migration entry
mm: fix do_pages_move status handling
fork: unconditionally clear stack on fork
- Store context switch out type in PERF_RECORD_SWITCH[_CPU_WIDE].
The percentage of preempting and non-preempting context switches help
understanding the nature of workloads (CPU or IO bound) that are running
on a machine. This adds the kernel facility and userspace changes needed
to show this information in 'perf script' and 'perf report -D' (Alexey Budankov)
- Remove old error messages about things that unlikely to be the root cause
in modern systems (Andi Kleen)
- Synchronize kernel ABI headers, v4.17-rc1 (Ingo Molnar)
- Support MAP_FIXED_NOREPLACE, noticed when updating the tools/include/
copies (Arnaldo Carvalho de Melo)
- Fixup BPF test using epoll_pwait syscall function probe, to cope with
the syscall routines renames performed in this development cycle (Arnaldo Carvalho de Melo)
- Fix sample_max_stack maximum check and do not proceed when an error
has been detect, return them to avoid misidentifying errors (Jiri Olsa)
- Add '\n' at the end of parse-options error messages (Ravi Bangoria)
- Add s390 support for detailed/verbose PMU event description (Thomas Richter)
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Merge tag 'perf-urgent-for-mingo-4.17-20180420' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
Pull perf/urgent fixes and improvements from Arnaldo Carvalho de Melo:
- Store context switch out type in PERF_RECORD_SWITCH[_CPU_WIDE].
The percentage of preempting and non-preempting context switches help
understanding the nature of workloads (CPU or IO bound) that are running
on a machine. This adds the kernel facility and userspace changes needed
to show this information in 'perf script' and 'perf report -D' (Alexey Budankov)
- Remove old error messages about things that unlikely to be the root cause
in modern systems (Andi Kleen)
- Synchronize kernel ABI headers, v4.17-rc1 (Ingo Molnar)
- Support MAP_FIXED_NOREPLACE, noticed when updating the tools/include/
copies (Arnaldo Carvalho de Melo)
- Fixup BPF test using epoll_pwait syscall function probe, to cope with
the syscall routines renames performed in this development cycle (Arnaldo Carvalho de Melo)
- Fix sample_max_stack maximum check and do not proceed when an error
has been detect, return them to avoid misidentifying errors (Jiri Olsa)
- Add '\n' at the end of parse-options error messages (Ravi Bangoria)
- Add s390 support for detailed/verbose PMU event description (Thomas Richter)
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
f2fs specifies the __GFP_ZERO flag for allocating some of its pages.
Unfortunately, the page cache also uses the mapping's GFP flags for
allocating radix tree nodes. It always masked off the __GFP_HIGHMEM
flag, and masks off __GFP_ZERO in some paths, but not all. That causes
radix tree nodes to be allocated with a NULL list_head, which causes
backtraces like:
__list_del_entry+0x30/0xd0
list_lru_del+0xac/0x1ac
page_cache_tree_insert+0xd8/0x110
The __GFP_DMA and __GFP_DMA32 flags would also be able to sneak through
if they are ever used. Fix them all by using GFP_RECLAIM_MASK at the
innermost location, and remove it from earlier in the callchain.
Link: http://lkml.kernel.org/r/20180411060320.14458-2-willy@infradead.org
Fixes: 449dd6984d ("mm: keep page cache radix tree nodes in check")
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Reported-by: Chris Fries <cfries@google.com>
Debugged-by: Minchan Kim <minchan@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit 4ed2863951 ("fs, elf: drop MAP_FIXED usage from elf_map") is
printing spurious messages under memory pressure due to map_addr == -ENOMEM.
9794 (a.out): Uhuuh, elf segment at 00007f2e34738000(fffffffffffffff4) requested but the memory is mapped already
14104 (a.out): Uhuuh, elf segment at 00007f34fd76c000(fffffffffffffff4) requested but the memory is mapped already
16843 (a.out): Uhuuh, elf segment at 00007f930ecc7000(fffffffffffffff4) requested but the memory is mapped already
Complain only if -EEXIST, and use %px for printing the address.
Link: http://lkml.kernel.org/r/201804182307.FAC17665.SFMOFJVFtHOLOQ@I-love.SAKURA.ne.jp
Fixes: 4ed2863951 ("fs, elf: drop MAP_FIXED usage from elf_map") is
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Andrei Vagin <avagin@openvz.org>
Cc: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Kees Cook <keescook@chromium.org>
Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Chun-Yi reported a kernel warning message below:
WARNING: CPU: 0 PID: 0 at ../mm/early_ioremap.c:182 early_iounmap+0x4f/0x12c()
early_iounmap(ffffffffff200180, 00000118) [0] size not consistent 00000120
The problem is x86 kexec_file_load adds extra alignment to the efi
memmap: in bzImage64_load():
efi_map_sz = efi_get_runtime_map_size();
efi_map_sz = ALIGN(efi_map_sz, 16);
And __efi_memmap_init maps with the size including the alignment bytes
but efi_memmap_unmap use nr_maps * desc_size which does not include the
extra bytes.
The alignment in kexec code is only needed for the kexec buffer internal
use Actually kexec should pass exact size of the efi memmap to 2nd
kernel.
Link: http://lkml.kernel.org/r/20180417083600.GA1972@dhcp-128-65.nay.redhat.com
Signed-off-by: Dave Young <dyoung@redhat.com>
Reported-by: joeyli <jlee@suse.com>
Tested-by: Randy Wright <rwright@hpe.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit 95846ecf9d ("pid: replace pid bitmap implementation with IDR
API") changed last field of /proc/loadavg (last pid allocated) to be off
by one:
# unshare -p -f --mount-proc cat /proc/loadavg
0.00 0.00 0.00 1/60 2 <===
It should be 1 after first fork into pid namespace.
This is formally a regression but given how useless this field is I
don't think anyone is affected.
Bug was found by /proc testsuite!
Link: http://lkml.kernel.org/r/20180413175408.GA27246@avx2
Fixes: 95846ecf9d ("pid: replace pid bitmap implementation with IDR API")
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Gargi Sharma <gs051095@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
task_dump_owner() has the following code:
mm = task->mm;
if (mm) {
if (get_dumpable(mm) != SUID_DUMP_USER) {
uid = ...
}
}
Check for ->mm is buggy -- kernel thread might be borrowing mm
and inode will go to some random uid:gid pair.
Link: http://lkml.kernel.org/r/20180412220109.GA20978@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The autofs file system mkdir inode operation blindly sets the created
directory mode to S_IFDIR | 0555, ingoring the passed in mode, which can
cause selinux dac_override denials.
But the function also checks if the caller is the daemon (as no-one else
should be able to do anything here) so there's no point in not honouring
the passed in mode, allowing the daemon to set appropriate mode when
required.
Link: http://lkml.kernel.org/r/152361593601.8051.14014139124905996173.stgit@pluto.themaw.net
Signed-off-by: Ian Kent <raven@themaw.net>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The idea behind using kernel@pengutronix.de (i.e. the mail alias for the
kernel people at Pengutronix) as email address was to have a backup when
a given developer is on vacation or run over by a bus. Make this more
explicit by adding the alias as reviewer and use the personal address
for Sascha and me.
Link: http://lkml.kernel.org/r/20180413083312.11213-1-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
KASAN uses the __no_sanitize_address macro to disable instrumentation of
particular functions. Right now it's defined only for GCC build, which
causes false positives when clang is used.
This patch adds a definition for clang.
Note, that clang's revision 329612 or higher is required.
[andreyknvl@google.com: remove redundant #ifdef CONFIG_KASAN check]
Link: http://lkml.kernel.org/r/c79aa31a2a2790f6131ed607c58b0dd45dd62a6c.1523967959.git.andreyknvl@google.com
Link: http://lkml.kernel.org/r/4ad725cc903f8534f8c8a60f0daade5e3d674f8d.1523554166.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Paul Lawrence <paullawrence@google.com>
Cc: Sandipan Das <sandipan@linux.vnet.ibm.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Some of the mport_dma_req structure members were initialized late
inside the do_dma_request() function, just before submitting the
request to the dma engine. But we have some error branches before
that. In case of such an error, the code would return on the error
path and trigger the calling of dma_req_free() with a req structure
which is not completely initialized. This causes a NULL pointer
dereference in dma_req_free().
This patch fixes these error branches by making sure that all
necessary mport_dma_req structure members are initialized in
rio_dma_transfer() immediately after the request structure gets
allocated.
Link: http://lkml.kernel.org/r/20180412150605.GA31409@nokia.com
Fixes: bbd876adb8 ("rapidio: use a reference count for struct mport_dma_req")
Signed-off-by: Ioan Nicu <ioan.nicu.ext@nokia.com>
Tested-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Acked-by: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Barry Wood <barry.wood@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Frank Kunz <frank.kunz@nokia.com>
Cc: <stable@vger.kernel.org> [4.6+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
My testing for the latest kernel supporting thp migration showed an
infinite loop in offlining the memory block that is filled with shmem
thps. We can get out of the loop with a signal, but kernel should return
with failure in this case.
What happens in the loop is that scan_movable_pages() repeats returning
the same pfn without any progress. That's because page migration always
fails for shmem thps.
In memory offline code, memory blocks containing unmovable pages should be
prevented from being offline targets by has_unmovable_pages() inside
start_isolate_page_range(). So it's possible to change migratability for
non-anonymous thps to avoid the issue, but it introduces more complex and
thp-specific handling in migration code, so it might not good.
So this patch is suggesting to fix the issue by enabling thp migration for
shmem thp. Both of anon/shmem thp are migratable so we don't need
precheck about the type of thps.
Link: http://lkml.kernel.org/r/20180406030706.GA2434@hori1.linux.bs1.fc.nec.co.jp
Fixes: commit 72b39cfc4d ("mm, memory_hotplug: do not fail offlining too early")
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Zi Yan <zi.yan@sent.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
lock_page_memcg()/unlock_page_memcg() use spin_lock_irqsave/restore() if
the page's memcg is undergoing move accounting, which occurs when a
process leaves its memcg for a new one that has
memory.move_charge_at_immigrate set.
unlocked_inode_to_wb_begin,end() use spin_lock_irq/spin_unlock_irq() if
the given inode is switching writeback domains. Switches occur when
enough writes are issued from a new domain.
This existing pattern is thus suspicious:
lock_page_memcg(page);
unlocked_inode_to_wb_begin(inode, &locked);
...
unlocked_inode_to_wb_end(inode, locked);
unlock_page_memcg(page);
If both inode switch and process memcg migration are both in-flight then
unlocked_inode_to_wb_end() will unconditionally enable interrupts while
still holding the lock_page_memcg() irq spinlock. This suggests the
possibility of deadlock if an interrupt occurs before unlock_page_memcg().
truncate
__cancel_dirty_page
lock_page_memcg
unlocked_inode_to_wb_begin
unlocked_inode_to_wb_end
<interrupts mistakenly enabled>
<interrupt>
end_page_writeback
test_clear_page_writeback
lock_page_memcg
<deadlock>
unlock_page_memcg
Due to configuration limitations this deadlock is not currently possible
because we don't mix cgroup writeback (a cgroupv2 feature) and
memory.move_charge_at_immigrate (a cgroupv1 feature).
If the kernel is hacked to always claim inode switching and memcg
moving_account, then this script triggers lockup in less than a minute:
cd /mnt/cgroup/memory
mkdir a b
echo 1 > a/memory.move_charge_at_immigrate
echo 1 > b/memory.move_charge_at_immigrate
(
echo $BASHPID > a/cgroup.procs
while true; do
dd if=/dev/zero of=/mnt/big bs=1M count=256
done
) &
while true; do
sync
done &
sleep 1h &
SLEEP=$!
while true; do
echo $SLEEP > a/cgroup.procs
echo $SLEEP > b/cgroup.procs
done
The deadlock does not seem possible, so it's debatable if there's any
reason to modify the kernel. I suggest we should to prevent future
surprises. And Wang Long said "this deadlock occurs three times in our
environment", so there's more reason to apply this, even to stable.
Stable 4.4 has minor conflicts applying this patch. For a clean 4.4 patch
see "[PATCH for-4.4] writeback: safer lock nesting"
https://lkml.org/lkml/2018/4/11/146
Wang Long said "this deadlock occurs three times in our environment"
[gthelen@google.com: v4]
Link: http://lkml.kernel.org/r/20180411084653.254724-1-gthelen@google.com
[akpm@linux-foundation.org: comment tweaks, struct initialization simplification]
Change-Id: Ibb773e8045852978f6207074491d262f1b3fb613
Link: http://lkml.kernel.org/r/20180410005908.167976-1-gthelen@google.com
Fixes: 682aa8e1a6 ("writeback: implement unlocked_inode_to_wb transaction and use it for stat updates")
Signed-off-by: Greg Thelen <gthelen@google.com>
Reported-by: Wang Long <wanglong19@meituan.com>
Acked-by: Wang Long <wanglong19@meituan.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: <stable@vger.kernel.org> [v4.2+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The swap offset reported by /proc/<pid>/pagemap may be not correct for
PMD migration entries. If addr passed into pagemap_pmd_range() isn't
aligned with PMD start address, the swap offset reported doesn't
reflect this. And in the loop to report information of each sub-page,
the swap offset isn't increased accordingly as that for PFN.
This may happen after opening /proc/<pid>/pagemap and seeking to a page
whose address doesn't align with a PMD start address. I have verified
this with a simple test program.
BTW: migration swap entries have PFN information, do we need to restrict
whether to show them?
[akpm@linux-foundation.org: fix typo, per Huang, Ying]
Link: http://lkml.kernel.org/r/20180408033737.10897-1-ying.huang@intel.com
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrei Vagin <avagin@openvz.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: "Jerome Glisse" <jglisse@redhat.com>
Cc: Daniel Colascione <dancol@google.com>
Cc: Zi Yan <zi.yan@cs.rutgers.edu>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Li Wang has reported that LTP move_pages04 test fails with the current
tree:
LTP move_pages04:
TFAIL : move_pages04.c:143: status[1] is EPERM, expected EFAULT
The test allocates an array of two pages, one is present while the other
is not (resp. backed by zero page) and it expects EFAULT for the second
page as the man page suggests. We are reporting EPERM which doesn't make
any sense and this is a result of a bug from cf5f16b23ec9 ("mm: unclutter
THP migration").
do_pages_move tries to handle as many pages in one batch as possible so we
queue all pages with the same node target together and that corresponds to
[start, i] range which is then used to update status array.
add_page_for_migration will correctly notice the zero (resp. !present)
page and returns with EFAULT which gets written to the status. But if
this is the last page in the array we do not update start and so the last
store_status after the loop will overwrite the range of the last batch
with NUMA_NO_NODE (which corresponds to EPERM).
Fix this by simply bailing out from the last flush if the pagelist is
empty as there is clearly nothing more to do.
Link: http://lkml.kernel.org/r/20180418121255.334-1-mhocko@kernel.org
Fixes: cf5f16b23ec9 ("mm: unclutter THP migration")
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reported-by: Li Wang <liwang@redhat.com>
Tested-by: Li Wang <liwang@redhat.com>
Cc: Zi Yan <zi.yan@cs.rutgers.edu>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
One of the classes of kernel stack content leaks[1] is exposing the
contents of prior heap or stack contents when a new process stack is
allocated. Normally, those stacks are not zeroed, and the old contents
remain in place. In the face of stack content exposure flaws, those
contents can leak to userspace.
Fixing this will make the kernel no longer vulnerable to these flaws, as
the stack will be wiped each time a stack is assigned to a new process.
There's not a meaningful change in runtime performance; it almost looks
like it provides a benefit.
Performing back-to-back kernel builds before:
Run times: 157.86 157.09 158.90 160.94 160.80
Mean: 159.12
Std Dev: 1.54
and after:
Run times: 159.31 157.34 156.71 158.15 160.81
Mean: 158.46
Std Dev: 1.46
Instead of making this a build or runtime config, Andy Lutomirski
recommended this just be enabled by default.
[1] A noisy search for many kinds of stack content leaks can be seen here:
https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=linux+kernel+stack+leak
I did some more with perf and cycle counts on running 100,000 execs of
/bin/true.
before:
Cycles: 218858861551 218853036130 214727610969 227656844122 224980542841
Mean: 221015379122.60
Std Dev: 4662486552.47
after:
Cycles: 213868945060 213119275204 211820169456 224426673259 225489986348
Mean: 217745009865.40
Std Dev: 5935559279.99
It continues to look like it's faster, though the deviation is rather
wide, but I'm not sure what I could do that would be less noisy. I'm
open to ideas!
Link: http://lkml.kernel.org/r/20180221021659.GA37073@beast
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
RHBZ: 1453123
Since at least the 3.10 kernel and likely a lot earlier we have
not been able to create unix domain sockets in a cifs share
when mounted using the SFU mount option (except when mounted
with the cifs unix extensions to Samba e.g.)
Trying to create a socket, for example using the af_unix command from
xfstests will cause :
BUG: unable to handle kernel NULL pointer dereference at 00000000
00000040
Since no one uses or depends on being able to create unix domains sockets
on a cifs share the easiest fix to stop this vulnerability is to simply
not allow creation of any other special files than char or block devices
when sfu is used.
Added update to Ronnie's patch to handle a tcon link leak, and
to address a buf leak noticed by Gustavo and Colin.
Acked-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
CC: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Reported-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Cc: stable@vger.kernel.org
Pull thermal fixes from Eduardo Valentin:
"A couple of fixes for the thermal subsystem"
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal:
dt-bindings: thermal: Remove "cooling-{min|max}-level" properties
dt-bindings: thermal: remove no longer needed samsung thermal properties
- sdhci-pci: Fixup tuning for AMD for eMMC HS200 mode
- renesas_sdhi_internal_dmac: Avoid data corruption by limiting DMA RX
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Merge tag 'mmc-v4.17-3' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Pull MMC fixes from Ulf Hansson:
"A couple of MMC host fixes:
- sdhci-pci: Fixup tuning for AMD for eMMC HS200 mode
- renesas_sdhi_internal_dmac: Avoid data corruption by limiting
DMA RX"
* tag 'mmc-v4.17-3' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
mmc: renesas_sdhi_internal_dmac: limit DMA RX for old SoCs
mmc: sdhci-pci: Only do AMD tuning for HS200
Pull MD fixes from Shaohua Li:
"Three small fixes for MD:
- md-cluster fix for faulty device from Guoqing
- writehint fix for writebehind IO for raid1 from Mariusz
- a live lock fix for interrupted recovery from Yufen"
* tag 'md/4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md:
raid1: copy write hint from master bio to behind bio
md/raid1: exit sync request if MD_RECOVERY_INTR is set
md-cluster: don't update recovery_offset for faulty device
When sending through SMB Direct, also dump the packet in SMB send path.
Also fixed a typo in debug message.
Signed-off-by: Long Li <longli@microsoft.com>
Cc: stable@vger.kernel.org
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
This patch enhances the following things:
- tree block header
* add generation and owner output for node and leaf
- node pointer generation output
- allow btrfs_print_tree() to not follow nodes
* just like btrfs-progs
Please note that, although function btrfs_print_tree() is not called by
anyone right now, it's still a pretty useful function to debug kernel.
So that function is still kept for later use.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
When the delayed refs for a head are all run, eventually
cleanup_ref_head is called which (in case of deletion) obtains a
reference for the relevant btrfs_space_info struct by querying the bg
for the range. This is problematic because when the last extent of a
bg is deleted a race window emerges between removal of that bg and the
subsequent invocation of cleanup_ref_head. This can result in cache being null
and either a null pointer dereference or assertion failure.
task: ffff8d04d31ed080 task.stack: ffff9e5dc10cc000
RIP: 0010:assfail.constprop.78+0x18/0x1a [btrfs]
RSP: 0018:ffff9e5dc10cfbe8 EFLAGS: 00010292
RAX: 0000000000000044 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8d04ffc1f868 RSI: ffff8d04ffc178c8 RDI: ffff8d04ffc178c8
RBP: ffff8d04d29e5ea0 R08: 00000000000001f0 R09: 0000000000000001
R10: ffff9e5dc0507d58 R11: 0000000000000001 R12: ffff8d04d29e5ea0
R13: ffff8d04d29e5f08 R14: ffff8d04efe29b40 R15: ffff8d04efe203e0
FS: 00007fbf58ead500(0000) GS:ffff8d04ffc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe6c6975648 CR3: 0000000013b2a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__btrfs_run_delayed_refs+0x10e7/0x12c0 [btrfs]
btrfs_run_delayed_refs+0x68/0x250 [btrfs]
btrfs_should_end_transaction+0x42/0x60 [btrfs]
btrfs_truncate_inode_items+0xaac/0xfc0 [btrfs]
btrfs_evict_inode+0x4c6/0x5c0 [btrfs]
evict+0xc6/0x190
do_unlinkat+0x19c/0x300
do_syscall_64+0x74/0x140
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x7fbf589c57a7
To fix this, introduce a new flag "is_system" to head_ref structs,
which is populated at insertion time. This allows to decouple the
querying for the spaceinfo from querying the possibly deleted bg.
Fixes: d7eae3403f ("Btrfs: rework delayed ref total_bytes_pinned accounting")
CC: stable@vger.kernel.org # 4.14+
Suggested-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
In do_mount() when the MS_* flags are being converted to MNT_* flags,
MS_RDONLY got accidentally convered to SB_RDONLY.
Undo this change.
Fixes: e462ec50cb ("VFS: Differentiate mount flags (MS_*) from internal superblock flags")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
AFS server records get removed from the net->fs_servers tree when
they're deleted, but not from the net->fs_addresses{4,6} lists, which
can lead to an oops in afs_find_server() when a server record has been
removed, for instance during rmmod.
Fix this by deleting the record from the by-address lists before posting
it for RCU destruction.
The reason this hasn't been noticed before is that the fileserver keeps
probing the local cache manager, thereby keeping the service record
alive, so the oops would only happen when a fileserver eventually gets
bored and stops pinging or if the module gets rmmod'd and a call comes
in from the fileserver during the window between the server records
being destroyed and the socket being closed.
The oops looks something like:
BUG: unable to handle kernel NULL pointer dereference at 000000000000001c
...
Workqueue: kafsd afs_process_async_call [kafs]
RIP: 0010:afs_find_server+0x271/0x36f [kafs]
...
Call Trace:
afs_deliver_cb_init_call_back_state3+0x1f2/0x21f [kafs]
afs_deliver_to_call+0x1ee/0x5e8 [kafs]
afs_process_async_call+0x5b/0xd0 [kafs]
process_one_work+0x2c2/0x504
worker_thread+0x1d4/0x2ac
kthread+0x11f/0x127
ret_from_fork+0x24/0x30
Fixes: d2ddc776a4 ("afs: Overhaul volume and server record caching and fileserver rotation")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pull networking fixes from David Miller:
1) Unbalanced refcounting in TIPC, from Jon Maloy.
2) Only allow TCP_MD5SIG to be set on sockets in close or listen state.
Once the connection is established it makes no sense to change this.
From Eric Dumazet.
3) Missing attribute validation in neigh_dump_table(), also from Eric
Dumazet.
4) Fix address comparisons in SCTP, from Xin Long.
5) Neigh proxy table clearing can deadlock, from Wolfgang Bumiller.
6) Fix tunnel refcounting in l2tp, from Guillaume Nault.
7) Fix double list insert in team driver, from Paolo Abeni.
8) af_vsock.ko module was accidently made unremovable, from Stefan
Hajnoczi.
9) Fix reference to freed llc_sap object in llc stack, from Cong Wang.
10) Don't assume netdevice struct is DMA'able memory in virtio_net
driver, from Michael S. Tsirkin.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (62 commits)
net/smc: fix shutdown in state SMC_LISTEN
bnxt_en: Fix memory fault in bnxt_ethtool_init()
virtio_net: sparse annotation fix
virtio_net: fix adding vids on big-endian
virtio_net: split out ctrl buffer
net: hns: Avoid action name truncation
docs: ip-sysctl.txt: fix name of some ipv6 variables
vmxnet3: fix incorrect dereference when rxvlan is disabled
llc: hold llc_sap before release_sock()
MAINTAINERS: Direct networking documentation changes to netdev
atm: iphase: fix spelling mistake: "Tansmit" -> "Transmit"
net: qmi_wwan: add Wistron Neweb D19Q1
net: caif: fix spelling mistake "UKNOWN" -> "UNKNOWN"
net: stmmac: Disable ACS Feature for GMAC >= 4
net: mvpp2: Fix DMA address mask size
net: change the comment of dev_mc_init
net: qualcomm: rmnet: Fix warning seen with fill_info
tun: fix vlan packet truncation
tipc: fix infinite loop when dumping link monitor summary
tipc: fix use-after-free in tipc_nametbl_stop
...
Pull vfs fixes from Al Viro:
"Assorted fixes.
Some of that is only a matter with fault injection (broken handling of
small allocation failure in various mount-related places), but the
last one is a root-triggerable stack overflow, and combined with
userns it gets really nasty ;-/"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
Don't leak MNT_INTERNAL away from internal mounts
mm,vmscan: Allow preallocating memory for register_shrinker().
rpc_pipefs: fix double-dput()
orangefs_kill_sb(): deal with allocation failures
jffs2_kill_sb(): deal with failed allocations
hypfs_kill_super(): deal with failed allocations
in the lower filesystem when filename encryption is enabled at the
eCryptfs layer.
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Merge tag 'ecryptfs-4.17-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs
Pull eCryptfs fixes from Tyler Hicks:
"Minor cleanups and a bug fix to completely ignore unencrypted
filenames in the lower filesystem when filename encryption is enabled
at the eCryptfs layer"
* tag 'ecryptfs-4.17-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
eCryptfs: don't pass up plaintext names when using filename encryption
ecryptfs: fix spelling mistake: "cadidate" -> "candidate"
ecryptfs: lookup: Don't check if mount_crypt_stat is NULL
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Merge tag 'for_v4.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
- isofs memory leak fix
- two fsnotify fixes of event mask handling
- udf fix of UTF-16 handling
- couple other smaller cleanups
* tag 'for_v4.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
udf: Fix leak of UTF-16 surrogates into encoded strings
fs: ext2: Adding new return type vm_fault_t
isofs: fix potential memory leak in mount option parsing
MAINTAINERS: add an entry for FSNOTIFY infrastructure
fsnotify: fix typo in a comment about mark->g_list
fsnotify: fix ignore mask logic in send_to_group()
isofs compress: Remove VLA usage
fs: quota: Replace GFP_ATOMIC with GFP_KERNEL in dquot_init
fanotify: fix logic of events on child
Pull HID updates from Jiri Kosina:
- suspend/resume handling fix for Raydium I2C-connected touchscreen
from Aaron Ma
- protocol fixup for certain BT-connected Wacoms from Aaron Armstrong
Skomra
- battery level reporting fix on BT-connected mice from Dmitry Torokhov
- hidraw race condition fix from Rodrigo Rivas Costa
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid:
HID: i2c-hid: fix inverted return value from i2c_hid_command()
HID: i2c-hid: Fix resume issue on Raydium touchscreen device
HID: wacom: bluetooth: send exit report for recent Bluetooth devices
HID: hidraw: Fix crash on HIDIOCGFEATURE with a destroyed device
HID: input: fix battery level reporting on BT mice
Pull livepatching fix from Jiri Kosina:
"Shadow variable API list_head initialization fix from Petr Mladek"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching:
livepatch: Allow to call a custom callback when freeing shadow variables
livepatch: Initialize shadow variables safely by a custom callback
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Merge tag 'for-linus-4.17-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross:
- some fixes of kmalloc() flags
- one fix of the xenbus driver
- an update of the pv sound driver interface needed for a driver which
will go through the sound tree
* tag 'for-linus-4.17-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen: xenbus_dev_frontend: Really return response string
xen/sndif: Sync up with the canonical definition in Xen
xen: xen-pciback: Replace GFP_ATOMIC with GFP_KERNEL in pcistub_reg_add
xen: xen-pciback: Replace GFP_ATOMIC with GFP_KERNEL in xen_pcibk_config_quirks_init
xen: xen-pciback: Replace GFP_ATOMIC with GFP_KERNEL in pcistub_device_alloc
xen: xen-pciback: Replace GFP_ATOMIC with GFP_KERNEL in pcistub_init_device
xen: xen-pciback: Replace GFP_ATOMIC with GFP_KERNEL in pcistub_probe
Fix an off-by-one bug in our alternative asm patching which leads to incorrectly
patched code. This bug lay dormant for nearly 10 years but we finally hit it
due to a recent change.
Fix lockups when running KVM guests on Power8 due to a missing check when a
thread that's running KVM comes out of idle.
Fix an out-of-spec behaviour in the XIVE code (P9 interrupt controller).
Fix EEH handling of bridge MMIO windows.
Prevent crashes in our RFI fallback flush handler if firmware didn't tell us the
size of the L1 cache (only seen on simulators).
Thanks to:
Benjamin Herrenschmidt, Madhavan Srinivasan, Michael Neuling.
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Merge tag 'powerpc-4.17-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman:
- Fix an off-by-one bug in our alternative asm patching which leads to
incorrectly patched code. This bug lay dormant for nearly 10 years
but we finally hit it due to a recent change.
- Fix lockups when running KVM guests on Power8 due to a missing check
when a thread that's running KVM comes out of idle.
- Fix an out-of-spec behaviour in the XIVE code (P9 interrupt
controller).
- Fix EEH handling of bridge MMIO windows.
- Prevent crashes in our RFI fallback flush handler if firmware didn't
tell us the size of the L1 cache (only seen on simulators).
Thanks to: Benjamin Herrenschmidt, Madhavan Srinivasan, Michael Neuling.
* tag 'powerpc-4.17-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/kvm: Fix lockups when running KVM guests on Power8
powerpc/eeh: Fix enabling bridge MMIO windows
powerpc/xive: Fix trying to "push" an already active pool VP
powerpc/64s: Default l1d_size to 64K in RFI fallback flush
powerpc/lib: Fix off-by-one in alternate feature patching
Pull s390 fixes and kexec-file-load from Martin Schwidefsky:
"After the common code kexec patches went in via Andrew we can now push
the architecture parts to implement the kexec-file-load system call.
Plus a few more bug fixes and cleanups, this includes an update to the
default configurations"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/signal: cleanup uapi struct sigaction
s390: rename default_defconfig to debug_defconfig
s390: remove gcov defconfig
s390: update defconfig
s390: add support for IBM z14 Model ZR1
s390: remove couple of duplicate includes
s390/boot: remove unused COMPILE_VERSION and ccflags-y
s390/nospec: include cpu.h
s390/decompressor: Ignore file vmlinux.bin.full
s390/kexec_file: add generated files to .gitignore
s390/Kconfig: Move kexec config options to "Processor type and features"
s390/kexec_file: Add ELF loader
s390/kexec_file: Add crash support to image loader
s390/kexec_file: Add image loader
s390/kexec_file: Add kexec_file_load system call
s390/kexec_file: Add purgatory
s390/kexec_file: Prepare setup.h for kexec_file_load
s390/smsgiucv: disable SMSG on module unload
s390/sclp: avoid potential usage of uninitialized value
SBOX on some Broadwell CPUs is broken because it's enabled unconditionally
despite the fact that there are no SBOXes available.
Check the Power Control Unit CAPID4 register to determine the number of
available SBOXes on the particular CPU before trying to enable them. If
there are none, nullify the SBOX descriptor so it isn't tried to be
initialized.
Signed-off-by: Oskar Senft <osk@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Mark van Dijk <mark@voidzero.net>
Reviewed-by: Kan Liang <kan.liang@intel.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: ak@linux.intel.com
Cc: peterz@infradead.org
Cc: eranian@google.com
Link: https://lkml.kernel.org/r/1521810690-2576-2-git-send-email-kan.liang@linux.intel.com
This reverts commit 3b94a89166 ("perf/x86/intel/uncore: Remove
SBOX support for Broadwell server")
Revert because there exists a proper workaround for Broadwell-EP servers
without SBOX now. Note that BDX-DE does not have a SBOX.
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kan Liang <kan.liang@intel.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: ak@linux.intel.com
Cc: osk@google.com
Cc: mark@voidzero.net
Link: https://lkml.kernel.org/r/1521810690-2576-1-git-send-email-kan.liang@linux.intel.com
On a system with 4-level page-tables there is no p4d, so the pud in the pgd
should be mapped. The old code before commit fb43d6cb91 already did that.
The change from above commit causes an invalid page-table which causes
undefined behavior. In one report it caused triple faults.
Fix it by changing the p4d back to pud.
Fixes: fb43d6cb91 ('x86/mm: Do not auto-massage page protections')
Reported-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michal Kubecek <mkubecek@suse.cz>
Tested-by: Borislav Petkov <bp@suse.de>
Cc: linux-pm@vger.kernel.org
Cc: rjw@rjwysocki.net
Cc: pavel@ucw.cz
Cc: hpa@zytor.com
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lkml.kernel.org/r/1524162360-26179-1-git-send-email-joro@8bytes.org
We want it only for the stuff created by SB_KERNMOUNT mounts, *not* for
their copies. As it is, creating a deep stack of bindings of /proc/*/ns/*
somewhere in a new namespace and exiting yields a stack overflow.
Cc: stable@kernel.org
Reported-by: Alexander Aring <aring@mojatatu.com>
Bisected-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Tested-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Tested-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Adding additional maintainers to libnvdimm related code and DAX.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
MAP_SYNC is a nop for device-dax. Allow MAP_SYNC to succeed on device-dax
to eliminate special casing between device-dax and fs-dax as to when the
flag can be specified. Device-dax users already implicitly assume that they do
not need to call fsync(), and this enables them to explicitly check for this
capability.
Cc: <stable@vger.kernel.org>
Fixes: b6fb293f24 ("mm: Define MAP_SYNC and VM_SYNC flags")
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
With commit df3f126482 ("libnvdimm, of_pmem: use dev_to_node() instead
of of_node_to_nid()") it is now possible to allow of_pmem to be built as
a module as originally implemented.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Remove the direct dependency on of_node_to_nid() by using dev_to_node()
instead. Any DT platform device will have its NUMA node id set when the
device is created.
With this, commit 291717b6fb ("libnvdimm, of_pmem: workaround OF_NUMA=n
build error") can be reverted.
Fixes: 7171976089 ("libnvdimm: Add device-tree based driver")
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Oliver O'Halloran <oohall@gmail.com>
Cc: linux-nvdimm@lists.01.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Calling shutdown with SHUT_RD and SHUT_RDWR for a listening SMC socket
crashes, because
commit 127f497058 ("net/smc: release clcsock from tcp_listen_worker")
releases the internal clcsock in smc_close_active() and sets smc->clcsock
to NULL.
For SHUT_RD the smc_close_active() call is removed.
For SHUT_RDWR the kernel_sock_shutdown() call is omitted, since the
clcsock is already released.
Fixes: 127f497058 ("net/smc: release clcsock from tcp_listen_worker")
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reported-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
In some firmware images, the length of BNX_DIR_TYPE_PKG_LOG nvram type
could be greater than the fixed buffer length of 4096 bytes allocated by
the driver. This was causing HWRM_NVM_READ to copy more data to the buffer
than the allocated size, causing general protection fault.
Fix the issue by allocating the exact buffer length returned by
HWRM_NVM_FIND_DIR_ENTRY, instead of 4096. Move the kzalloc() call
into the bnxt_get_pkgver() function.
Fixes: 3ebf6f0a09 ("bnxt_en: Add installed-package firmware version reporting via Ethtool GDRVINFO")
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Michael S. Tsirkin says:
====================
virtio: ctrl buffer fixes
Here are a couple of fixes related to the virtio control buffer.
Lightly tested on x86 only.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
offloads is a buffer in virtio format, should use
the __virtio64 tag.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Programming vids (adding or removing them) still passes
guest-endian values in the DMA buffer. That's wrong
if guest is big-endian and when virtio 1 is enabled.
Note: this is on top of a previous patch:
virtio_net: split out ctrl buffer
Fixes: 9465a7a6f ("virtio_net: enable v1.0 support")
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
