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A vlan device with vid 0 is allow to creat by not able to be fully
cleaned up by unregister_vlan_dev() which checks for vlan_id!=0.
Also, VLAN 0 is probably not a valid number and it is kinda
"reserved" for HW accelerating devices, but it is probably too
late to reject it from creation even if makes sense. Instead,
just remove the check in unregister_vlan_dev().
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Fixes: ad1afb003939 ("vlan_dev: VLAN 0 should be treated as "no vlan tag" (802.1p packet)")
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers
Kalle Valo says:
====================
wireless-drivers fixes for 4.15
Hopefully the last set of fixes for 4.15.
iwlwifi
* fix DMA mapping regression since v4.14
wcn36xx
* fix dynamic power save which has been broken since the driver was commited
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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If one of the child devices is missing the of_mdiobus_register_phy()
call will return -ENODEV. When a missing device is encountered the
registration of the remaining PHYs is stopped and the MDIO bus will
fail to register. Propagate all errors except ENODEV to avoid it.
Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
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gcc-8 reports
net/caif/caif_usb.c: In function 'cfusbl_device_notify':
./include/linux/string.h:245:9: warning: '__builtin_strncpy' output may
be truncated copying 15 bytes from a string of length 15
[-Wstringop-truncation]
The compiler require that the input param 'len' of strncpy() should be
greater than the length of the src string, so that '\0' is copied as
well. We can just use strlcpy() to avoid this warning.
Signed-off-by: Xiongfeng Wang <xiongfeng.wang@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Kornilios Kourtis <kou@zurich.ibm.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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set_fipers() calling should be protected by spinlock in
case that any interrupt breaks related registers setting
and the function we expect. This patch is to move set_fipers()
to spinlock protecting area in ptp_gianfar_adjtime().
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Marcelo Ricardo Leitner says:
====================
sctp: Some sockopt optlen fixes
Hangbin Liu reported that some SCTP sockopt are allowing the user to get
the kernel to allocate really large buffers by not having a ceiling on
optlen.
This patchset address this issue (in patch 2), replace an GFP_ATOMIC
that isn't needed and avoid calculating the option size multiple times
in some setsockopt.
====================
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Some sockopt handling functions were calculating the length of the
buffer to be written to userspace and then calculating it again when
actually writing the buffer, which could lead to some write not using
an up-to-date length.
This patch updates such places to just make use of the len variable.
Also, replace some sizeof(type) to sizeof(var).
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Hangbin Liu reported that some sockopt calls could cause the kernel to log
a warning on memory allocation failure if the user supplied a large optlen
value. That is because some of them called memdup_user() without a ceiling
on optlen, allowing it to try to allocate really large buffers.
This patch adds a ceiling by limiting optlen to the maximum allowed that
would still make sense for these sockopt.
Reported-by: Hangbin Liu <haliu@redhat.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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So replace it with GFP_USER and also add __GFP_NOWARN.
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"A collection of the last-minute small PCM fixes:
- A workaround for the recent regression wrt PulseAudio
- Removal of spurious WARN_ON() that is triggered by syzkaller
- Fixes for aloop, hardening racy accesses
- Fixes in PCM OSS emulation wrt the unabortable loops that may cause
RCU stall"
* tag 'sound-4.15-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ALSA: pcm: Allow aborting mutex lock at OSS read/write loops
ALSA: pcm: Abort properly at pending signal in OSS read/write loops
ALSA: aloop: Fix racy hw constraints adjustment
ALSA: aloop: Fix inconsistent format due to incomplete rule
ALSA: aloop: Release cable upon open error path
ALSA: pcm: Workaround for weird PulseAudio behavior on rewind error
ALSA: pcm: Add missing error checks in OSS emulation plugin builder
ALSA: pcm: Remove incorrect snd_BUG_ON() usages
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Daniel Borkmann says:
====================
pull-request: bpf 2018-01-09
The following pull-request contains BPF updates for your *net* tree.
The main changes are:
1) Prevent out-of-bounds speculation in BPF maps by masking the
index after bounds checks in order to fix spectre v1, and
add an option BPF_JIT_ALWAYS_ON into Kconfig that allows for
removing the BPF interpreter from the kernel in favor of
JIT-only mode to make spectre v2 harder, from Alexei.
2) Remove false sharing of map refcount with max_entries which
was used in spectre v1, from Daniel.
3) Add a missing NULL psock check in sockmap in order to fix
a race, from John.
4) Fix test_align BPF selftest case since a recent change in
verifier rejects the bit-wise arithmetic on pointers
earlier but test_align update was missing, from Alexei.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Two kernel headers got modified recently due to meltdown/spectre, in:
a89f040fa34e ("x86/cpufeatures: Add X86_BUG_CPU_INSECURE")
which are used by tooling as well:
arch/x86/include/asm/cpufeatures.h
arch/x86/include/asm/disabled-features.h
None of those changes have an effect on tooling, so do a plain copy.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-qqzcs8ri3vks8cypg0puk0ae@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Similar to --tasks, producing the same output plus /proc/<PID>/maps
similar lines for each mmap record present in a perf.data file.
Please note that not all mmaps are stored, for instance, some of the
non-executable mmaps are only stored when 'perf record --data' is used,
when the user wants to resolve data accesses in addition to asking for
executable mmaps to get the DSO with symtabs.
E.g.:
# perf record sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.018 MB perf.data (7 samples) ]
[root@jouet ~]# perf report --mmaps
# pid tid ppid comm
0 0 -1 |swapper
4137 4137 -1 |sleep
5628a35a1000-5628a37aa000 r-xp 00000000 3147148 /usr/bin/sleep
7fb65ad51000-7fb65b134000 r-xp 00000000 3149795 /usr/lib64/libc-2.26.so
7fb65b134000-7fb65b35e000 r-xp 00000000 3149715 /usr/lib64/ld-2.26.so
7ffd94b9f000-7ffd94ba1000 r-xp 00000000 0 [vdso]
#
# perf record sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.019 MB perf.data (8 samples) ]
# perf report --mmaps
# pid tid ppid comm
0 0 -1 |swapper
4161 4161 -1 |sleep
55afae69a000-55afae8a3000 r-xp 00000000 3147148 /usr/bin/sleep
7f569f00d000-7f569f3f0000 r-xp 00000000 3149795 /usr/lib64/libc-2.26.so
7f569f3f0000-7f569f61a000 r-xp 00000000 3149715 /usr/lib64/ld-2.26.so
7fff6fffe000-7fff70000000 r-xp 00000000 0 [vdso]
#
# perf record time sleep 1
0.00user 0.00system 0:01.00elapsed 0%CPU (0avgtext+0avgdata 2156maxresident)k
0inputs+0outputs (0major+73minor)pagefaults 0swaps
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.019 MB perf.data (14 samples) ]
# perf report --mmaps
# pid tid ppid comm
0 0 -1 |swapper
4281 4281 -1 |time
560560dca000-560560fcf000 r-xp 00000000 3190458 /usr/bin/time
7fc175196000-7fc175579000 r-xp 00000000 3149795 /usr/lib64/libc-2.26.so
7fc175579000-7fc1757a3000 r-xp 00000000 3149715 /usr/lib64/ld-2.26.so
7ffc924f6000-7ffc924f8000 r-xp 00000000 0 [vdso]
4282 4282 4281 | sleep
560560dca000-560560fcf000 r-xp 00000000 3190458 /usr/bin/time
564b4de3c000-564b4e045000 r-xp 00000000 3147148 /usr/bin/sleep
7f6a5a716000-7f6a5aaf9000 r-xp 00000000 3149795 /usr/lib64/libc-2.26.so
7f6a5aaf9000-7f6a5ad23000 r-xp 00000000 3149715 /usr/lib64/ld-2.26.so
7fc175196000-7fc175579000 r-xp 00000000 3149795 /usr/lib64/libc-2.26.so
7fc175579000-7fc1757a3000 r-xp 00000000 3149715 /usr/lib64/ld-2.26.so
7ffc924f6000-7ffc924f8000 r-xp 00000000 0 [vdso]
7ffcec7e6000-7ffcec7e8000 r-xp 00000000 0 [vdso]
#
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-zulwdlg5rfowogr1qznorvvc@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Add --tasks option to display monitored tasks stored in perf.data.
Displaying pid/tid/ppid plus the command string aligned to distinguish
parent and child tasks.
$ perf record -a
...
$ perf report --tasks
# pid tid ppid comm
0 0 -1 |swapper
2 2 0 | kthreadd
14080 14080 2 | kworker/u17:1
4 4 2 | kworker/0:0H
6 6 2 | mm_percpu_wq
...
1 1 0 | systemd
23242 23242 1 | firefox
23242 23298 23242 | Cache2 I/O
23242 23304 23242 | GMPThread
...
1195 1195 1 | login
1611 1611 1195 | bash
1639 1639 1611 | startx
1663 1663 1639 | xinit
1673 1673 1663 | xmonad-x86_64-l
23939 23939 1673 | xterm
23941 23941 23939 | bash
23963 23963 23941 | mutt
24954 24954 23963 | offlineimap
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180107160356.28203-13-jolsa@kernel.org
[ Make it --tasks, plural, --task works as well, as its unambiguous ]
[ Use machine__find_thread(), not findnew(), as pointed out by Namhyung ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Before:
# trace -a -e gettid sleep 0.01
<SNIP>
4.863 ( 0.005 ms): Chrome_ChildIO/26241 gettid() = 26241
4.931 ( 0.004 ms): Chrome_IOThrea/26154 gettid() = 26154
4.942 ( 0.001 ms): Chrome_IOThrea/26154 gettid() = 26154
4.946 ( 0.001 ms): Chrome_IOThrea/26154 gettid() = 26154
4.970 ( 0.002 ms): Chrome_IOThrea/26154 gettid() = 26154
#
After:
# trace -a -e gettid sleep 0.01
0.000 ( 0.009 ms): Chrome_IOThrea/26154 gettid() = 26154 (Chrome_IOThread)
<SNIP>
3.416 ( 0.002 ms): Chrome_ChildIO/26241 gettid() = 26241 (Chrome_ChildIOT)
3.424 ( 0.001 ms): Chrome_ChildIO/26241 gettid() = 26241 (Chrome_ChildIOT)
3.343 ( 0.002 ms): chrome/26116 gettid() = 26116 (chrome)
3.386 ( 0.002 ms): Chrome_IOThrea/26154 gettid() = 26154 (Chrome_IOThread)
4.003 ( 0.003 ms): Chrome_ChildIO/26241 gettid() = 26241 (Chrome_ChildIOT)
4.031 ( 0.002 ms): Chrome_IOThrea/26154 gettid() = 26154 (Chrome_IOThread)
#
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-kyg4gz2yy0vkrrh2vtq29u71@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Add --stats option to display quick data statistics of event numbers,
without any further processing, like the one at the end of the perf
report -D command.
$ perf report --stat
Aggregated stats:
TOTAL events: 4566
MMAP events: 113
LOST events: 19
COMM events: 3
FORK events: 400
SAMPLE events: 3315
MMAP2 events: 32
FINISHED_ROUND events: 681
THREAD_MAP events: 1
CPU_MAP events: 1
TIME_CONV events: 1
I found this useful when hunting lost events for another change.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180107160356.28203-12-jolsa@kernel.org
[ Rename it to --stats, plural ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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I want to display the pure events status coming in the next patch and
the tool's warnings are superfluous in the output. Making it optional,
enabled by default.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180107160356.28203-11-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Adding option to display lost events:
$ perf script --show-lost-events ...
mplayer 13810 [002] 468011.402396: 100 cycles:ppp: ff..
mplayer 13810 [002] 468011.402396: PERF_RECORD_LOST lost 3880
mplayer 13810 [002] 468011.402397: 100 cycles:ppp: ff..
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180107160356.28203-10-jolsa@kernel.org
[ Use PRIu64 when printing u64 values, fixing the build in some arches ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Since commit f11a04464ae57e8d ("i2c: gpio: Enable working over slow
can_sleep GPIOs"), probing the i2c RTC connected to an i2c-gpio bus on
r8a7740/armadillo fails with:
rtc-s35390a 0-0030: error resetting chip
rtc-s35390a: probe of 0-0030 failed with error -5
More debug code reveals:
i2c i2c-0: master_xfer[0] R, addr=0x30, len=1
i2c i2c-0: NAK from device addr 0x30 msg #0
s35390a_get_reg: ret = -6
Commit 02e479808b5d62f8 ("gpio: Alter semantics of *raw* operations to
actually be raw") moved open drain/source handling from
gpiod_set_raw_value_commit() to gpiod_set_value(), but forgot to take
into account that gpiod_set_value_cansleep() also needs this handling.
The i2c protocol mandates that i2c signals are open drain, hence i2c
communication fails.
Fix this by adding the missing handling to gpiod_set_value_cansleep(),
using a new common helper gpiod_set_value_nocheck().
Fixes: 02e479808b5d62f8 ("gpio: Alter semantics of *raw* operations to actually be raw")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
[removed underscore syntax, added kerneldoc]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/palmer/linux
Pull RISC-V updates from Palmer Dabbelt:
"This contains what I hope are the last RISC-V changes to go into 4.15.
I know it's a bit last minute, but I think they're all fairly small
changes:
- SR_* constants have been renamed to match the latest ISA
specification.
- Some CONFIG_MMU #ifdef cruft has been removed. We've never
supported !CONFIG_MMU.
- __NR_riscv_flush_icache is now visible to userspace. We were hoping
to avoid making this public in order to force userspace to call the
vDSO entry, but it looks like QEMU's user-mode emulation doesn't
want to emulate a vDSO. In order to allow glibc to fall back to a
system call when the vDSO entry doesn't exist we're just
- Our defconfig is no long empty. This is another one that just
slipped through the cracks. The defconfig isn't perfect, but it's
at least close to what users will want for the first RISC-V
development board. Getting closer is kind of splitting hairs here:
none of the RISC-V specific drivers are in yet, so it's not like
things will boot out of the box.
The only one that's strictly necessary is the __NR_riscv_flush_icache
change, as I want that to be part of the public API starting from our
first kernel so nobody has to worry about it. The others are nice to
haves, but they seem sane for 4.15 to me"
* tag 'riscv-for-linus-4.15-rc8_cleanups' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/linux:
riscv: rename SR_* constants to match the spec
riscv: remove CONFIG_MMU ifdefs
RISC-V: Make __NR_riscv_flush_icache visible to userspace
RISC-V: Add a basic defconfig
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Pull MIPS fixes from Ralf Baechle:
"Another round of MIPS fixes for 4.15.
- Maciej Rozycki found another series of FP issues which requires a
seven part series to restructure and fix.
- James fixes a warning about .set mt which gas doesn't like when
building for R1 processors"
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: Validate PR_SET_FP_MODE prctl(2) requests against the ABI of the task
MIPS: Disallow outsized PTRACE_SETREGSET NT_PRFPREG regset accesses
MIPS: Also verify sizeof `elf_fpreg_t' with PTRACE_SETREGSET
MIPS: Fix an FCSR access API regression with NT_PRFPREG and MSA
MIPS: Consistently handle buffer counter with PTRACE_SETREGSET
MIPS: Guard against any partial write attempt with PTRACE_SETREGSET
MIPS: Factor out NT_PRFPREG regset access helpers
MIPS: CPS: Fix r1 .set mt assembler warning
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The BPF interpreter has been used as part of the spectre 2 attack CVE-2017-5715.
A quote from goolge project zero blog:
"At this point, it would normally be necessary to locate gadgets in
the host kernel code that can be used to actually leak data by reading
from an attacker-controlled location, shifting and masking the result
appropriately and then using the result of that as offset to an
attacker-controlled address for a load. But piecing gadgets together
and figuring out which ones work in a speculation context seems annoying.
So instead, we decided to use the eBPF interpreter, which is built into
the host kernel - while there is no legitimate way to invoke it from inside
a VM, the presence of the code in the host kernel's text section is sufficient
to make it usable for the attack, just like with ordinary ROP gadgets."
To make attacker job harder introduce BPF_JIT_ALWAYS_ON config
option that removes interpreter from the kernel in favor of JIT-only mode.
So far eBPF JIT is supported by:
x64, arm64, arm32, sparc64, s390, powerpc64, mips64
The start of JITed program is randomized and code page is marked as read-only.
In addition "constant blinding" can be turned on with net.core.bpf_jit_harden
v2->v3:
- move __bpf_prog_ret0 under ifdef (Daniel)
v1->v2:
- fix init order, test_bpf and cBPF (Daniel's feedback)
- fix offloaded bpf (Jakub's feedback)
- add 'return 0' dummy in case something can invoke prog->bpf_func
- retarget bpf tree. For bpf-next the patch would need one extra hunk.
It will be sent when the trees are merged back to net-next
Considered doing:
int bpf_jit_enable __read_mostly = BPF_EBPF_JIT_DEFAULT;
but it seems better to land the patch as-is and in bpf-next remove
bpf_jit_enable global variable from all JITs, consolidate in one place
and remove this jit_init() function.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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Pull block fixes from Jens Axboe:
"A set of fixes that should go into this release. This contains:
- An NVMe pull request from Christoph, with a few critical fixes for
NVMe.
- A block drain queue fix from Ming.
- The concurrent lo_open/release fix for loop"
* 'for-linus' of git://git.kernel.dk/linux-block:
loop: fix concurrent lo_open/lo_release
block: drain queue before waiting for q_usage_counter becoming zero
nvme-fcloop: avoid possible uninitialized variable warning
nvme-mpath: fix last path removal during traffic
nvme-rdma: fix concurrent reset and reconnect
nvme: fix sector units when going between formats
nvme-pci: move use_sgl initialization to nvme_init_iod()
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In addition to commit b2157399cc98 ("bpf: prevent out-of-bounds
speculation") also change the layout of struct bpf_map such that
false sharing of fast-path members like max_entries is avoided
when the maps reference counter is altered. Therefore enforce
them to be placed into separate cachelines.
pahole dump after change:
struct bpf_map {
const struct bpf_map_ops * ops; /* 0 8 */
struct bpf_map * inner_map_meta; /* 8 8 */
void * security; /* 16 8 */
enum bpf_map_type map_type; /* 24 4 */
u32 key_size; /* 28 4 */
u32 value_size; /* 32 4 */
u32 max_entries; /* 36 4 */
u32 map_flags; /* 40 4 */
u32 pages; /* 44 4 */
u32 id; /* 48 4 */
int numa_node; /* 52 4 */
bool unpriv_array; /* 56 1 */
/* XXX 7 bytes hole, try to pack */
/* --- cacheline 1 boundary (64 bytes) --- */
struct user_struct * user; /* 64 8 */
atomic_t refcnt; /* 72 4 */
atomic_t usercnt; /* 76 4 */
struct work_struct work; /* 80 32 */
char name[16]; /* 112 16 */
/* --- cacheline 2 boundary (128 bytes) --- */
/* size: 128, cachelines: 2, members: 17 */
/* sum members: 121, holes: 1, sum holes: 7 */
};
Now all entries in the first cacheline are read only throughout
the life time of the map, set up once during map creation. Overall
struct size and number of cachelines doesn't change from the
reordering. struct bpf_map is usually first member and embedded
in map structs in specific map implementations, so also avoid those
members to sit at the end where it could potentially share the
cacheline with first map values e.g. in the array since remote
CPUs could trigger map updates just as well for those (easily
dirtying members like max_entries intentionally as well) while
having subsequent values in cache.
Quoting from Google's Project Zero blog [1]:
Additionally, at least on the Intel machine on which this was
tested, bouncing modified cache lines between cores is slow,
apparently because the MESI protocol is used for cache coherence
[8]. Changing the reference counter of an eBPF array on one
physical CPU core causes the cache line containing the reference
counter to be bounced over to that CPU core, making reads of the
reference counter on all other CPU cores slow until the changed
reference counter has been written back to memory. Because the
length and the reference counter of an eBPF array are stored in
the same cache line, this also means that changing the reference
counter on one physical CPU core causes reads of the eBPF array's
length to be slow on other physical CPU cores (intentional false
sharing).
While this doesn't 'control' the out-of-bounds speculation through
masking the index as in commit b2157399cc98, triggering a manipulation
of the map's reference counter is really trivial, so lets not allow
to easily affect max_entries from it.
Splitting to separate cachelines also generally makes sense from
a performance perspective anyway in that fast-path won't have a
cache miss if the map gets pinned, reused in other progs, etc out
of control path, thus also avoids unintentional false sharing.
[1] https://googleprojectzero.blogspot.ch/2018/01/reading-privileged-memory-with-side.html
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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In the current code, when creating a new fib6 table, tb6_root.leaf gets
initialized to net->ipv6.ip6_null_entry.
If a default route is being added with rt->rt6i_metric = 0xffffffff,
fib6_add() will add this route after net->ipv6.ip6_null_entry. As
null_entry is shared, it could cause problem.
In order to fix it, set fn->leaf to NULL before calling
fib6_add_rt2node() when trying to add the first default route.
And reset fn->leaf to null_entry when adding fails or when deleting the
last default route.
syzkaller reported the following issue which is fixed by this commit:
WARNING: suspicious RCU usage
4.15.0-rc5+ #171 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1702 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
4 locks held by swapper/0/0:
#0: ((&net->ipv6.ip6_fib_timer)){+.-.}, at: [<00000000d43f631b>] lockdep_copy_map include/linux/lockdep.h:178 [inline]
#0: ((&net->ipv6.ip6_fib_timer)){+.-.}, at: [<00000000d43f631b>] call_timer_fn+0x1c6/0x820 kernel/time/timer.c:1310
#1: (&(&net->ipv6.fib6_gc_lock)->rlock){+.-.}, at: [<000000002ff9d65c>] spin_lock_bh include/linux/spinlock.h:315 [inline]
#1: (&(&net->ipv6.fib6_gc_lock)->rlock){+.-.}, at: [<000000002ff9d65c>] fib6_run_gc+0x9d/0x3c0 net/ipv6/ip6_fib.c:2007
#2: (rcu_read_lock){....}, at: [<0000000091db762d>] __fib6_clean_all+0x0/0x3a0 net/ipv6/ip6_fib.c:1560
#3: (&(&tb->tb6_lock)->rlock){+.-.}, at: [<000000009e503581>] spin_lock_bh include/linux/spinlock.h:315 [inline]
#3: (&(&tb->tb6_lock)->rlock){+.-.}, at: [<000000009e503581>] __fib6_clean_all+0x1d0/0x3a0 net/ipv6/ip6_fib.c:1948
stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc5+ #171
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4585
fib6_del+0xcaa/0x11b0 net/ipv6/ip6_fib.c:1701
fib6_clean_node+0x3aa/0x4f0 net/ipv6/ip6_fib.c:1892
fib6_walk_continue+0x46c/0x8a0 net/ipv6/ip6_fib.c:1815
fib6_walk+0x91/0xf0 net/ipv6/ip6_fib.c:1863
fib6_clean_tree+0x1e6/0x340 net/ipv6/ip6_fib.c:1933
__fib6_clean_all+0x1f4/0x3a0 net/ipv6/ip6_fib.c:1949
fib6_clean_all net/ipv6/ip6_fib.c:1960 [inline]
fib6_run_gc+0x16b/0x3c0 net/ipv6/ip6_fib.c:2016
fib6_gc_timer_cb+0x20/0x30 net/ipv6/ip6_fib.c:2033
call_timer_fn+0x228/0x820 kernel/time/timer.c:1320
expire_timers kernel/time/timer.c:1357 [inline]
__run_timers+0x7ee/0xb70 kernel/time/timer.c:1660
run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1686
__do_softirq+0x2d7/0xb85 kernel/softirq.c:285
invoke_softirq kernel/softirq.c:365 [inline]
irq_exit+0x1cc/0x200 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:540 [inline]
smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052
apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:904
</IRQ>
Reported-by: syzbot <syzkaller@googlegroups.com>
Fixes: 66f5d6ce53e6 ("ipv6: replace rwlock with rcu and spinlock in fib6_table")
Signed-off-by: Wei Wang <weiwan@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Sergei Shtylyov says:
====================
Ether fixes for the SolutionEngine771x boards
Here's the series of 2 patches against Linus' repo. This series should
(hoplefully) fix the Ether support on the SolutionEngine771x boards...
[1/2] SolutionEngine771x: fix Ether platform data
[2/2] SolutionEngine771x: add Ether TSU resource
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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After the Ether platform data is fixed, the driver probe() method would
still fail since the 'struct sh_eth_cpu_data' corresponding to SH771x
indicates the presence of TSU but the memory resource for it is absent.
Add the missing TSU resource to both Ether devices and fix the harmless
off-by-one error in the main memory resources, while at it...
Fixes: 4986b996882d ("net: sh_eth: remove the SH_TSU_ADDR")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The 'sh_eth' driver's probe() method would fail on the SolutionEngine7710
board and crash on SolutionEngine7712 board as the platform code is
hopelessly behind the driver's platform data -- it passes the PHY address
instead of 'struct sh_eth_plat_data *'; pass the latter to the driver in
order to fix the bug...
Fixes: 71557a37adb5 ("[netdrvr] sh_eth: Add SH7619 support")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Fix the following 'make htmldocs' complaint:
Documentation/networking/msg_zerocopy.rst:: WARNING: document isn't included in any toctree.
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Commit 8f659a03a0ba ("net: ipv4: fix for a race condition in
raw_sendmsg") fixed the issue of possibly inconsistent ->hdrincl handling
due to concurrent updates by reading this bit-field member into a local
variable and using the thus stabilized value in subsequent tests.
However, aforementioned commit also adds the (correct) comment that
/* hdrincl should be READ_ONCE(inet->hdrincl)
* but READ_ONCE() doesn't work with bit fields
*/
because as it stands, the compiler is free to shortcut or even eliminate
the local variable at its will.
Note that I have not seen anything like this happening in reality and thus,
the concern is a theoretical one.
However, in order to be on the safe side, emulate a READ_ONCE() on the
bit-field by doing it on the local 'hdrincl' variable itself:
int hdrincl = inet->hdrincl;
hdrincl = READ_ONCE(hdrincl);
This breaks the chain in the sense that the compiler is not allowed
to replace subsequent reads from hdrincl with reloads from inet->hdrincl.
Fixes: 8f659a03a0ba ("net: ipv4: fix for a race condition in raw_sendmsg")
Signed-off-by: Nicolai Stange <nstange@suse.de>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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gcc-8 reports
net/caif/caif_dev.c: In function 'caif_enroll_dev':
./include/linux/string.h:245:9: warning: '__builtin_strncpy' output may
be truncated copying 15 bytes from a string of length 15
[-Wstringop-truncation]
net/caif/cfctrl.c: In function 'cfctrl_linkup_request':
./include/linux/string.h:245:9: warning: '__builtin_strncpy' output may
be truncated copying 15 bytes from a string of length 15
[-Wstringop-truncation]
net/caif/cfcnfg.c: In function 'caif_connect_client':
./include/linux/string.h:245:9: warning: '__builtin_strncpy' output may
be truncated copying 15 bytes from a string of length 15
[-Wstringop-truncation]
The compiler require that the input param 'len' of strncpy() should be
greater than the length of the src string, so that '\0' is copied as
well. We can just use strlcpy() to avoid this warning.
Signed-off-by: Xiongfeng Wang <xiongfeng.wang@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Commit d3834fefcfe5 ("rbd: bump queue_max_segments") bumped
max_segments (unsigned short) to max_hw_sectors (unsigned int).
max_hw_sectors is set to the number of 512-byte sectors in an object
and overflows unsigned short for 32M (largest possible) objects, making
the block layer resort to handing us single segment (i.e. single page
or even smaller) bios in that case.
Cc: stable@vger.kernel.org
Fixes: d3834fefcfe5 ("rbd: bump queue_max_segments")
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
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Otherwise, future operations on this RBD using exclusive-lock are
going to require the lock from a non-existent client id.
Cc: stable@vger.kernel.org
Fixes: 14bb211d324d ("rbd: support updating the lock cookie without releasing the lock")
Link: http://tracker.ceph.com/issues/19929
Signed-off-by: Florian Margaine <florian@platform.sh>
[idryomov@gmail.com: rbd_set_owner_cid() call, __rbd_lock() helper]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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Use AF_INET6 instead of AF_INET in IPv6-related code path
Signed-off-by: Andrii Vladyka <tulup@mail.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Pull networking fixes from David Miller:
1) Frag and UDP handling fixes in i40e driver, from Amritha Nambiar and
Alexander Duyck.
2) Undo unintentional UAPI change in netfilter conntrack, from Florian
Westphal.
3) Revert a change to how error codes are returned from
dev_get_valid_name(), it broke some apps.
4) Cannot cache routes for ipv6 tunnels in the tunnel is ipv4/ipv6
dual-stack. From Eli Cooper.
5) Fix missed PMTU updates in geneve, from Xin Long.
6) Cure double free in macvlan, from Gao Feng.
7) Fix heap out-of-bounds write in rds_message_alloc_sgs(), from
Mohamed Ghannam.
8) FEC bug fixes from FUgang Duan (mis-accounting of dev_id, missed
deferral of probe when the regulator is not ready yet).
9) Missing DMA mapping error checks in 3c59x, from Neil Horman.
10) Turn off Broadcom tags for some b53 switches, from Florian Fainelli.
11) Fix OOPS when get_target_net() is passed an SKB whose NETLINK_CB()
isn't initialized. From Andrei Vagin.
12) Fix crashes in fib6_add(), from Wei Wang.
13) PMTU bug fixes in SCTP from Marcelo Ricardo Leitner.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (56 commits)
sh_eth: fix TXALCR1 offsets
mdio-sun4i: Fix a memory leak
phylink: mark expected switch fall-throughs in phylink_mii_ioctl
sctp: fix the handling of ICMP Frag Needed for too small MTUs
sctp: do not retransmit upon FragNeeded if PMTU discovery is disabled
xen-netfront: enable device after manual module load
bnxt_en: Fix the 'Invalid VF' id check in bnxt_vf_ndo_prep routine.
bnxt_en: Fix population of flow_type in bnxt_hwrm_cfa_flow_alloc()
sh_eth: fix SH7757 GEther initialization
net: fec: free/restore resource in related probe error pathes
uapi/if_ether.h: prevent redefinition of struct ethhdr
ipv6: fix general protection fault in fib6_add()
RDS: null pointer dereference in rds_atomic_free_op
sh_eth: fix TSU resource handling
net: stmmac: enable EEE in MII, GMII or RGMII only
rtnetlink: give a user socket to get_target_net()
MAINTAINERS: Update my email address.
can: ems_usb: improve error reporting for error warning and error passive
can: flex_can: Correct the checking for frame length in flexcan_start_xmit()
can: gs_usb: fix return value of the "set_bittiming" callback
...
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Pull rdma fixes from Doug Ledford:
- One line fix to mlx4 error flow (same as mlx5 fix in last pull
request, just in the mlx4 driver)
- Fix a race condition in the IPoIB driver. This patch is larger than
just a one line fix, but resolves a race condition in a fairly
straight forward manner
- Fix a locking issue in the RDMA netlink code. This patch is also
larger than I would like for a late -rc. It has, however, had a week
to bake in the rdma tree prior to this pull request
- One line fix to fix granting remote machine access to memory that
they don't need and shouldn't have
- One line fix to correct the fact that our sgid/dgid pair is swapped
from what you would expect when receiving an incoming connection
request
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
IB/srpt: Fix ACL lookup during login
IB/srpt: Disable RDMA access by the initiator
RDMA/netlink: Fix locking around __ib_get_device_by_index
IB/ipoib: Fix race condition in neigh creation
IB/mlx4: Fix mlx4_ib_alloc_mr error flow
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Under speculation, CPUs may mis-predict branches in bounds checks. Thus,
memory accesses under a bounds check may be speculated even if the
bounds check fails, providing a primitive for building a side channel.
To avoid leaking kernel data round up array-based maps and mask the index
after bounds check, so speculated load with out of bounds index will load
either valid value from the array or zero from the padded area.
Unconditionally mask index for all array types even when max_entries
are not rounded to power of 2 for root user.
When map is created by unpriv user generate a sequence of bpf insns
that includes AND operation to make sure that JITed code includes
the same 'index & index_mask' operation.
If prog_array map is created by unpriv user replace
bpf_tail_call(ctx, map, index);
with
if (index >= max_entries) {
index &= map->index_mask;
bpf_tail_call(ctx, map, index);
}
(along with roundup to power 2) to prevent out-of-bounds speculation.
There is secondary redundant 'if (index >= max_entries)' in the interpreter
and in all JITs, but they can be optimized later if necessary.
Other array-like maps (cpumap, devmap, sockmap, perf_event_array, cgroup_array)
cannot be used by unpriv, so no changes there.
That fixes bpf side of "Variant 1: bounds check bypass (CVE-2017-5753)" on
all architectures with and without JIT.
v2->v3:
Daniel noticed that attack potentially can be crafted via syscall commands
without loading the program, so add masking to those paths as well.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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git://git.infradead.org/linux-platform-drivers-x86
Pull x86 platform driver fix from Darren Hart:
"Address a wmi initcall ordering race resulting in a difficult to
reproduce boot failure"
* tag 'platform-drivers-x86-v4.15-4' of git://git.infradead.org/linux-platform-drivers-x86:
platform/x86: wmi: Call acpi_wmi_init() later
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The TXALCR1 offsets are incorrect in the register offset tables, most
probably due to copy&paste error. Luckily, the driver never uses this
register. :-)
Fixes: 4a55530f38e4 ("net: sh_eth: modify the definitions of register")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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If the probing of the regulator is deferred, the memory allocated by
'mdiobus_alloc_size()' will be leaking.
It should be freed before the next call to 'sun4i_mdio_probe()' which will
reallocate it.
Fixes: 4bdcb1dd9feb ("net: Add MDIO bus driver for the Allwinner EMAC")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
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In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.
Addresses-Coverity-ID: 1463447 ("Missing break in switch")
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Marcelo Ricardo Leitner says:
====================
SCTP PMTU discovery fixes
This patchset fixes 2 issues with PMTU discovery that can lead to flood
of retransmissions.
The first patch fixes the issue for when PMTUD is disabled by the
application, while the second fixes it for when its enabled.
Please consider these to stable.
====================
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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syzbot reported a hang involving SCTP, on which it kept flooding dmesg
with the message:
[ 246.742374] sctp: sctp_transport_update_pmtu: Reported pmtu 508 too
low, using default minimum of 512
That happened because whenever SCTP hits an ICMP Frag Needed, it tries
to adjust to the new MTU and triggers an immediate retransmission. But
it didn't consider the fact that MTUs smaller than the SCTP minimum MTU
allowed (512) would not cause the PMTU to change, and issued the
retransmission anyway (thus leading to another ICMP Frag Needed, and so
on).
As IPv4 (ip_rt_min_pmtu=556) and IPv6 (IPV6_MIN_MTU=1280) minimum MTU
are higher than that, sctp_transport_update_pmtu() is changed to
re-fetch the PMTU that got set after our request, and with that, detect
if there was an actual change or not.
The fix, thus, skips the immediate retransmission if the received ICMP
resulted in no change, in the hope that SCTP will select another path.
Note: The value being used for the minimum MTU (512,
SCTP_DEFAULT_MINSEGMENT) is not right and instead it should be (576,
SCTP_MIN_PMTU), but such change belongs to another patch.
Changes from v1:
- do not disable PMTU discovery, in the light of commit
06ad391919b2 ("[SCTP] Don't disable PMTU discovery when mtu is small")
and as suggested by Xin Long.
- changed the way to break the rtx loop by detecting if the icmp
resulted in a change or not
Changes from v2:
none
See-also: https://lkml.org/lkml/2017/12/22/811
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Currently, if PMTU discovery is disabled on a given transport, but the
configured value is higher than the actual PMTU, it is likely that we
will get some icmp Frag Needed. The issue is, if PMTU discovery is
disabled, we won't update the information and will issue a
retransmission immediately, which may very well trigger another ICMP,
and another retransmission, leading to a loop.
The fix is to simply not trigger immediate retransmissions if PMTU
discovery is disabled on the given transport.
Changes from v2:
- updated stale comment, noticed by Xin Long
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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When loading the module after unloading it, the network interface would
not be enabled and thus wouldn't have a backend counterpart and unable
to be used by the guest.
The guest would face errors like:
[root@guest ~]# ethtool -i eth0
Cannot get driver information: No such device
[root@guest ~]# ifconfig eth0
eth0: error fetching interface information: Device not found
This patch initializes the state of the netfront device whenever it is
loaded manually, this state would communicate the netback to create its
device and establish the connection between them.
Signed-off-by: Eduardo Otubo <otubo@redhat.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Michael Chan says:
====================
bnxt_en: 2 small bug fixes.
The first one fixes the TC Flower flow parameter passed to firmware. The
2nd one fixes the VF index range checking for iproute2 SRIOV related commands.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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In bnxt_vf_ndo_prep (which is called by bnxt_get_vf_config ndo), there is a
check for "Invalid VF id". Currently, the check is done against max_vfs.
However, the user doesn't always create max_vfs. So, the check should be
against the created number of VFs. The number of bnxt_vf_info structures
that are allocated in bnxt_alloc_vf_resources routine is the "number of
requested VFs". So, if an "invalid VF id" falls between the requested
number of VFs and the max_vfs, the driver will be dereferencing an invalid
pointer.
Fixes: c0c050c58d84 ("bnxt_en: New Broadcom ethernet driver.")
Signed-off-by: Venkat Devvuru <venkatkumar.duvvuru@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
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flow_type in HWRM_FLOW_ALLOC is not being populated correctly due to
incorrect passing of pointer and size of l3_mask argument of is_wildcard().
Fixed this.
Fixes: db1d36a27324 ("bnxt_en: add TC flower offload flow_alloc/free FW cmds")
Signed-off-by: Sunil Challa <sunilkumar.challa@broadcom.com>
Reviewed-by: Sathya Perla <sathya.perla@broadcom.com>
Reviewed-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Pull cgroup fixes from Tejun Heo:
"This contains fixes for the following two non-trivial issues:
- The task iterator got broken while adding thread mode support for
v4.14. It was less visible because it only triggers when both
cgroup1 and cgroup2 hierarchies are in use. The recent versions of
systemd uses cgroup2 for process management even when cgroup1 is
used for resource control exposing this issue.
- cpuset CPU hotplug path could deadlock when racing against exits.
There also are two patches to replace unlimited strcpy() usages with
strlcpy()"
* 'for-4.15-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
cgroup: fix css_task_iter crash on CSS_TASK_ITER_PROC
cgroup: Fix deadlock in cpu hotplug path
cgroup: use strlcpy() instead of strscpy() to avoid spurious warning
cgroup: avoid copying strings longer than the buffers
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