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A request for a flowlabel fails in process or user exclusive mode must
fail if the caller pid or uid does not match. Invert the test.
Previously, the test was unsafe wrt PID recycling, but indeed tested
for inequality: fl1->owner != fl->owner
Fixes: 4f82f45730c68 ("net ip6 flowlabel: Make owner a union of struct pid* and kuid_t")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan
Stefan Schmidt says:
====================
ieee802154 for net 2019-04-25
An update from ieee802154 for your *net* tree.
Another fix from Kangjie Lu to ensure better checking regmap updates in the
mcr20a driver. Nothing else I have pending for the final release.
If there are any problems let me know.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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regmap_update_bits could fail and deserves a check.
The patch adds the checks and if it fails, returns its error
code upstream.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211
Johannes Berg says:
====================
* fix use-after-free in mac80211 TXQs
* fix RX STBC byte order
* fix debugfs rename crashing due to ERR_PTR()
* fix missing regulatory notification
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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We need to dereference the directory to get its parent to
be able to rename it, so it's clearly not safe to try to
do this with ERR_PTR() pointers. Skip in this case.
It seems that this is most likely what was causing the
report by syzbot, but I'm not entirely sure as it didn't
come with a reproducer this time.
Cc: stable@vger.kernel.org
Reported-by: syzbot+4ece1a28b8f4730547c9@syzkaller.appspotmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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Commit c82c06ce43d3("cfg80211: Notify all User Hints To self managed wiphys")
notified all new user hints to self managed wiphy's after device registration.
But it didn't do this for anything other than cell base hints done before
registration.
This needs to be done during wiphy registration of a self managed device also,
so that the previous user settings are retained.
Fixes: c82c06ce43d3 ("cfg80211: Notify all User Hints To self managed wiphys")
Signed-off-by: Sriram R <srirrama@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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The txq of vif is added to active_txqs list for ATF TXQ scheduling
in the function ieee80211_queue_skb(), but it was not properly removed
before freeing the txq object. It was causing use after free of the txq
objects from the active_txqs list, result was kernel panic
due to invalid memory access.
Fix kernel invalid memory access by properly removing txq object
from active_txqs list before free the object.
Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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The original patch neglected to take byte order conversions
into account, fix that.
Fixes: d9bb410888ce ("mac80211: allow overriding HT STBC capabilities")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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Currently, the UDP GRO code path does bad things on some edge
conditions - Aggregation can happen even on packet with different
lengths.
Fix the above by rewriting the 'complete' condition for GRO
packets. While at it, note explicitly that we allow merging the
first packet per burst below gso_size.
Reported-by: Sean Tong <seantong114@gmail.com>
Fixes: e20cf8d3f1f7 ("udp: implement GRO for plain UDP sockets.")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Jakub Kicinski says:
====================
net/tls: fix data copies in tls_device_reencrypt()
This series fixes the tls_device_reencrypt() which is broken
if record starts in the frags of the message skb.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Fragments may contain data from other records so we have to account
for that when we calculate the destination and max length of copy we
can perform. Note that 'offset' is the offset within the message,
so it can't be passed as offset within the frag..
Here skb_store_bits() would have realised the call is wrong and
simply not copy data.
Fixes: 4799ac81e52a ("tls: Add rx inline crypto offload")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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There is no guarantee the record starts before the skb frags.
If we don't check for this condition copy amount will get
negative, leading to reads and writes to random memory locations.
Familiar hilarity ensues.
Fixes: 4799ac81e52a ("tls: Add rx inline crypto offload")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Michael Chan says:
====================
bnxt_en: Misc. bug fixes.
6 miscellaneous bug fixes covering several issues in error code paths,
a setup issue for statistics DMA, and an improvement for setting up
multicast address filters.
Please queue these for stable as well.
Patch #5 (bnxt_en: Fix statistics context reservation logic) is for the
most recent 5.0 stable only. Thanks.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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In bnxt_rx_pkt(), if the driver encounters BD errors, it will recycle
the buffers and jump to the end where the uninitailized variable "len"
is referenced. Fix it by adding a new jump label that will skip
the length update. This is the most correct fix since the length
may not be valid when we get this type of error.
Fixes: 6a8788f25625 ("bnxt_en: add support for software dynamic interrupt moderation")
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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In an earlier commit that fixes the number of stats contexts to
reserve for the RDMA driver, we added a function parameter to pass in
the number of stats contexts to all the relevant functions. The passed
in parameter should have been used to set the enables field of the
firmware message.
Fixes: 780baad44f0f ("bnxt_en: Reserve 1 stat_ctx for RDMA driver.")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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If driver determines that extended TX port statistics are not supported
or allocation of the data structure fails, make sure to pass 0 TX stats
size to firmware to disable it. The firmware returned TX stats size should
also be set to 0 for consistency. This will prevent
bnxt_get_ethtool_stats() from accessing the NULL TX stats pointer in
case there is mismatch between firmware and driver.
Fixes: 36e53349b60b ("bnxt_en: Add additional extended port statistics.")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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If we encounter errors during open and proceed to clean up,
bnxt_hwrm_ring_free() may crash if the rings we try to free have never
been allocated. bnxt_cp_ring_for_rx() or bnxt_cp_ring_for_tx()
may reference pointers that have not been allocated.
Fix it by checking for valid fw_ring_id first before calling
bnxt_cp_ring_for_rx() or bnxt_cp_ring_for_tx().
Fixes: 2c61d2117ecb ("bnxt_en: Add helper functions to get firmware CP ring ID.")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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In the bnxt_init_one() error path, short FW command request memory
is not freed. This patch fixes it.
Fixes: e605db801bde ("bnxt_en: Support for Short Firmware Message")
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>
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The driver builds a list of multicast addresses and sends it to the
firmware when the driver's ndo_set_rx_mode() is called. In rare
cases, the firmware can fail this call if internal resources to
add multicast addresses are exhausted. In that case, we should
try the call again by setting the ALL_MCAST flag which is more
guaranteed to succeed.
Fixes: c0c050c58d84 ("bnxt_en: New Broadcom ethernet driver.")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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marvell_get_sset_count() returns how many statistics counters there
are. If the PHY supports fibre, there are 3, otherwise two.
marvell_get_strings() does not make this distinction, and always
returns 3 strings. This then often results in writing past the end
of the buffer for the strings.
Fixes: 2170fef78a40 ("Marvell phy: add field to get errors from fiber link.")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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When allocating the next family->id it makes more sense to use
idr_alloc_cyclic to avoid re-using a previously used family->id as much
as possible.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Adding device entries found in vendor modified versions of this
driver. Function maps for some of the devices follow:
WNC D16Q1, D16Q5, D18Q1 LTE CAT3 module (1435:0918)
MI_00 Qualcomm HS-USB Diagnostics
MI_01 Android Debug interface
MI_02 Qualcomm HS-USB Modem
MI_03 Qualcomm Wireless HS-USB Ethernet Adapter
MI_04 Qualcomm Wireless HS-USB Ethernet Adapter
MI_05 Qualcomm Wireless HS-USB Ethernet Adapter
MI_06 USB Mass Storage Device
T: Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1435 ProdID=0918 Rev= 2.32
S: Manufacturer=Android
S: Product=Android
S: SerialNumber=0123456789ABCDEF
C:* #Ifs= 7 Cfg#= 1 Atr=80 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=(none)
E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E: Ad=84(I) Atr=03(Int.) MxPS= 64 Ivl=32ms
E: Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
E: Ad=86(I) Atr=03(Int.) MxPS= 64 Ivl=32ms
E: Ad=85(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
E: Ad=88(I) Atr=03(Int.) MxPS= 64 Ivl=32ms
E: Ad=87(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 5 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
E: Ad=8a(I) Atr=03(Int.) MxPS= 64 Ivl=32ms
E: Ad=89(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=06(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
WNC D18 LTE CAT3 module (1435:d182)
MI_00 Qualcomm HS-USB Diagnostics
MI_01 Androd Debug interface
MI_02 Qualcomm HS-USB Modem
MI_03 Qualcomm HS-USB NMEA
MI_04 Qualcomm Wireless HS-USB Ethernet Adapter
MI_05 Qualcomm Wireless HS-USB Ethernet Adapter
MI_06 USB Mass Storage Device
ZM8510/ZM8620/ME3960 (19d2:0396)
MI_00 ZTE Mobile Broadband Diagnostics Port
MI_01 ZTE Mobile Broadband AT Port
MI_02 ZTE Mobile Broadband Modem
MI_03 ZTE Mobile Broadband NDIS Port (qmi_wwan)
MI_04 ZTE Mobile Broadband ADB Port
ME3620_X (19d2:1432)
MI_00 ZTE Diagnostics Device
MI_01 ZTE UI AT Interface
MI_02 ZTE Modem Device
MI_03 ZTE Mobile Broadband Network Adapter
MI_04 ZTE Composite ADB Interface
Reported-by: Lars Melin <larsm17@gmail.com>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Manage the -EPROBE_DEFER error case for "stm32_pwr_wakeup" IRQ.
Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Acked-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Canonical way to fetch sk_user_data from an encap_rcv() handler called
from UDP stack in rcu protected section is to use rcu_dereference_sk_user_data(),
otherwise compiler might read it multiple times.
Fixes: d00fa9adc528 ("il2tp: fix races with tunnel socket close")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Alexei Starovoitov says:
====================
pull-request: bpf 2019-04-25
The following pull-request contains BPF updates for your *net* tree.
The main changes are:
1) the bpf verifier fix to properly mark registers in all stack frames, from Paul.
2) preempt_enable_no_resched->preempt_enable fix, from Peter.
3) other misc fixes.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Unless the very next line is schedule(), or implies it, one must not use
preempt_enable_no_resched(). It can cause a preemption to go missing and
thereby cause arbitrary delays, breaking the PREEMPT=y invariant.
Cc: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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The first test case, for pointer null checks, is equivalent to the
following pseudo-code. It checks that the verifier does not complain on
line 6 and recognizes that ptr isn't null.
1: ptr = bpf_map_lookup_elem(map, &key);
2: ret = subprog(ptr) {
3: return ptr != NULL;
4: }
5: if (ret)
6: value = *ptr;
The second test case, for packet bound checks, is equivalent to the
following pseudo-code. It checks that the verifier does not complain on
line 7 and recognizes that the packet is at least 1 byte long.
1: pkt_end = ctx.pkt_end;
2: ptr = ctx.pkt + 8;
3: ret = subprog(ptr, pkt_end) {
4: return ptr <= pkt_end;
5: }
6: if (ret)
7: value = *(u8 *)ctx.pkt;
Signed-off-by: Paul Chaignon <paul.chaignon@orange.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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In case of a null check on a pointer inside a subprog, we should mark all
registers with this pointer as either safe or unknown, in both the current
and previous frames. Currently, only spilled registers and registers in
the current frame are marked. Packet bound checks in subprogs have the
same issue. This patch fixes it to mark registers in previous frames as
well.
A good reproducer for null checks looks as follow:
1: ptr = bpf_map_lookup_elem(map, &key);
2: ret = subprog(ptr) {
3: return ptr != NULL;
4: }
5: if (ret)
6: value = *ptr;
With the above, the verifier will complain on line 6 because it sees ptr
as map_value_or_null despite the null check in subprog 1.
Note that this patch fixes another resulting bug when using
bpf_sk_release():
1: sk = bpf_sk_lookup_tcp(...);
2: subprog(sk) {
3: if (sk)
4: bpf_sk_release(sk);
5: }
6: if (!sk)
7: return 0;
8: return 1;
In the above, mark_ptr_or_null_regs will warn on line 6 because it will
try to free the reference state, even though it was already freed on
line 3.
Fixes: f4d7e40a5b71 ("bpf: introduce function calls (verification)")
Signed-off-by: Paul Chaignon <paul.chaignon@orange.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Some binaries are generated when building libbpf from tools/lib/bpf/,
namely libbpf.so.0.0.2 and libbpf.so.0.
Add them to the local .gitignore.
Signed-off-by: Matteo Croce <mcroce@redhat.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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"bpftool map create" has an infinite loop on "while (argc)". The error
case is missing.
Symptoms: when forgetting to type the keyword 'type' in front of 'hash':
$ sudo bpftool map create /sys/fs/bpf/dir/foobar hash key 8 value 8 entries 128
(infinite loop, taking all the CPU)
^C
After the patch:
$ sudo bpftool map create /sys/fs/bpf/dir/foobar hash key 8 value 8 entries 128
Error: unknown arg hash
Fixes: 0b592b5a01be ("tools: bpftool: add map create command")
Signed-off-by: Alban Crequy <alban@kinvolk.io>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Fix sparse warning:
arch/mips/net/ebpf_jit.c:196:5: warning:
symbol 'ebpf_to_mips_reg' was not declared. Should it be static?
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Pull io_uring fixes from Jens Axboe:
"This is mostly io_uring fixes/tweaks. Most of these were actually done
in time for the last -rc, but I wanted to ensure that everything
tested out great before including them. The code delta looks larger
than it really is, as it's mostly just comment additions/changes.
Outside of the comment additions/changes, this is mostly removal of
unnecessary barriers. In all, this pull request contains:
- Tweak to how we handle errors at submission time. We now post a
completion event if the error occurs on behalf of an sqe, instead
of returning it through the system call. If the error happens
outside of a specific sqe, we return the error through the system
call. This makes it nicer to use and makes the "normal" use case
behave the same as the offload cases. (me)
- Fix for a missing req reference drop from async context (me)
- If an sqe is submitted with RWF_NOWAIT, don't punt it to async
context. Return -EAGAIN directly, instead of using it as a hint to
do async punt. (Stefan)
- Fix notes on barriers (Stefan)
- Remove unnecessary barriers (Stefan)
- Fix potential double free of memory in setup error (Mark)
- Further improve sq poll CPU validation (Mark)
- Fix page allocation warning and leak on buffer registration error
(Mark)
- Fix iov_iter_type() for new no-ref flag (Ming)
- Fix a case where dio doesn't honor bio no-page-ref (Ming)"
* tag 'for-linus-20190502' of git://git.kernel.dk/linux-block:
io_uring: avoid page allocation warnings
iov_iter: fix iov_iter_type
block: fix handling for BIO_NO_PAGE_REF
io_uring: drop req submit reference always in async punt
io_uring: free allocated io_memory once
io_uring: fix SQPOLL cpu validation
io_uring: have submission side sqe errors post a cqe
io_uring: remove unnecessary barrier after unsetting IORING_SQ_NEED_WAKEUP
io_uring: remove unnecessary barrier after incrementing dropped counter
io_uring: remove unnecessary barrier before reading SQ tail
io_uring: remove unnecessary barrier after updating SQ head
io_uring: remove unnecessary barrier before reading cq head
io_uring: remove unnecessary barrier before wq_has_sleeper
io_uring: fix notes on barriers
io_uring: fix handling SQEs requesting NOWAIT
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In io_sqe_buffer_register() we allocate a number of arrays based on the
iov_len from the user-provided iov. While we limit iov_len to SZ_1G,
we can still attempt to allocate arrays exceeding MAX_ORDER.
On a 64-bit system with 4KiB pages, for an iov where iov_base = 0x10 and
iov_len = SZ_1G, we'll calculate that nr_pages = 262145. When we try to
allocate a corresponding array of (16-byte) bio_vecs, requiring 4194320
bytes, which is greater than 4MiB. This results in SLUB warning that
we're trying to allocate greater than MAX_ORDER, and failing the
allocation.
Avoid this by using kvmalloc() for allocations dependent on the
user-provided iov_len. At the same time, fix a leak of imu->bvec when
registration fails.
Full splat from before this patch:
WARNING: CPU: 1 PID: 2314 at mm/page_alloc.c:4595 __alloc_pages_nodemask+0x7ac/0x2938 mm/page_alloc.c:4595
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 2314 Comm: syz-executor326 Not tainted 5.1.0-rc7-dirty #4
Hardware name: linux,dummy-virt (DT)
Call trace:
dump_backtrace+0x0/0x2f0 include/linux/compiler.h:193
show_stack+0x20/0x30 arch/arm64/kernel/traps.c:158
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x110/0x190 lib/dump_stack.c:113
panic+0x384/0x68c kernel/panic.c:214
__warn+0x2bc/0x2c0 kernel/panic.c:571
report_bug+0x228/0x2d8 lib/bug.c:186
bug_handler+0xa0/0x1a0 arch/arm64/kernel/traps.c:956
call_break_hook arch/arm64/kernel/debug-monitors.c:301 [inline]
brk_handler+0x1d4/0x388 arch/arm64/kernel/debug-monitors.c:316
do_debug_exception+0x1a0/0x468 arch/arm64/mm/fault.c:831
el1_dbg+0x18/0x8c
__alloc_pages_nodemask+0x7ac/0x2938 mm/page_alloc.c:4595
alloc_pages_current+0x164/0x278 mm/mempolicy.c:2132
alloc_pages include/linux/gfp.h:509 [inline]
kmalloc_order+0x20/0x50 mm/slab_common.c:1231
kmalloc_order_trace+0x30/0x2b0 mm/slab_common.c:1243
kmalloc_large include/linux/slab.h:480 [inline]
__kmalloc+0x3dc/0x4f0 mm/slub.c:3791
kmalloc_array include/linux/slab.h:670 [inline]
io_sqe_buffer_register fs/io_uring.c:2472 [inline]
__io_uring_register fs/io_uring.c:2962 [inline]
__do_sys_io_uring_register fs/io_uring.c:3008 [inline]
__se_sys_io_uring_register fs/io_uring.c:2990 [inline]
__arm64_sys_io_uring_register+0x9e0/0x1bc8 fs/io_uring.c:2990
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall arch/arm64/kernel/syscall.c:47 [inline]
el0_svc_common.constprop.0+0x148/0x2e0 arch/arm64/kernel/syscall.c:83
el0_svc_handler+0xdc/0x100 arch/arm64/kernel/syscall.c:129
el0_svc+0x8/0xc arch/arm64/kernel/entry.S:948
SMP: stopping secondary CPUs
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
CPU features: 0x002,23000438
Memory Limit: none
Rebooting in 1 seconds..
Fixes: edafccee56ff3167 ("io_uring: add support for pre-mapped user IO buffers")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-block@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Commit 875f1d0769cd ("iov_iter: add ITER_BVEC_FLAG_NO_REF flag")
introduces one extra flag of ITER_BVEC_FLAG_NO_REF, and this flag
is stored into iter->type.
However, iov_iter_type() doesn't consider the new added flag, fix
it by masking this flag in iov_iter_type().
Fixes: 875f1d0769cd ("iov_iter: add ITER_BVEC_FLAG_NO_REF flag")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Commit 399254aaf489211 ("block: add BIO_NO_PAGE_REF flag") introduces
BIO_NO_PAGE_REF, and once this flag is set for one bio, all pages
in the bio won't be get/put during IO.
However, if one bio is submitted via __blkdev_direct_IO_simple(),
even though BIO_NO_PAGE_REF is set, pages still may be put.
Fixes this issue by avoiding to put pages if BIO_NO_PAGE_REF is
set.
Fixes: 399254aaf489211 ("block: add BIO_NO_PAGE_REF flag")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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If we don't end up actually calling submit in io_sq_wq_submit_work(),
we still need to drop the submit reference to the request. If we
don't, then we can leak the request. This can happen if we race
with ring shutdown while flushing the workqueue for requests that
require use of the mm_struct.
Fixes: e65ef56db494 ("io_uring: use regular request ref counts")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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If io_allocate_scq_urings() fails to allocate an sq_* region, it will
call io_mem_free() for any previously allocated regions, but leave
dangling pointers to these regions in the ctx. Any regions which have
not yet been allocated are left NULL. Note that when returning
-EOVERFLOW, the previously allocated sq_ring is not freed, which appears
to be an unintentional leak.
When io_allocate_scq_urings() fails, io_uring_create() will call
io_ring_ctx_wait_and_kill(), which calls io_mem_free() on all the sq_*
regions, assuming the pointers are valid and not NULL.
This can result in pages being freed multiple times, which has been
observed to corrupt the page state, leading to subsequent fun. This can
also result in virt_to_page() on NULL, resulting in the use of bogus
page addresses, and yet more subsequent fun. The latter can be detected
with CONFIG_DEBUG_VIRTUAL on arm64.
Adding a cleanup path to io_allocate_scq_urings() complicates the logic,
so let's leave it to io_ring_ctx_free() to consistently free these
pointers, and simplify the io_allocate_scq_urings() error paths.
Full splats from before this patch below. Note that the pointer logged
by the DEBUG_VIRTUAL "non-linear address" warning has been hashed, and
is actually NULL.
[ 26.098129] page:ffff80000e949a00 count:0 mapcount:-128 mapping:0000000000000000 index:0x0
[ 26.102976] flags: 0x63fffc000000()
[ 26.104373] raw: 000063fffc000000 ffff80000e86c188 ffff80000ea3df08 0000000000000000
[ 26.108917] raw: 0000000000000000 0000000000000001 00000000ffffff7f 0000000000000000
[ 26.137235] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)
[ 26.143960] ------------[ cut here ]------------
[ 26.146020] kernel BUG at include/linux/mm.h:547!
[ 26.147586] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[ 26.149163] Modules linked in:
[ 26.150287] Process syz-executor.21 (pid: 20204, stack limit = 0x000000000e9cefeb)
[ 26.153307] CPU: 2 PID: 20204 Comm: syz-executor.21 Not tainted 5.1.0-rc7-00004-g7d30b2ea43d6 #18
[ 26.156566] Hardware name: linux,dummy-virt (DT)
[ 26.158089] pstate: 40400005 (nZcv daif +PAN -UAO)
[ 26.159869] pc : io_mem_free+0x9c/0xa8
[ 26.161436] lr : io_mem_free+0x9c/0xa8
[ 26.162720] sp : ffff000013003d60
[ 26.164048] x29: ffff000013003d60 x28: ffff800025048040
[ 26.165804] x27: 0000000000000000 x26: ffff800025048040
[ 26.167352] x25: 00000000000000c0 x24: ffff0000112c2820
[ 26.169682] x23: 0000000000000000 x22: 0000000020000080
[ 26.171899] x21: ffff80002143b418 x20: ffff80002143b400
[ 26.174236] x19: ffff80002143b280 x18: 0000000000000000
[ 26.176607] x17: 0000000000000000 x16: 0000000000000000
[ 26.178997] x15: 0000000000000000 x14: 0000000000000000
[ 26.181508] x13: 00009178a5e077b2 x12: 0000000000000001
[ 26.183863] x11: 0000000000000000 x10: 0000000000000980
[ 26.186437] x9 : ffff000013003a80 x8 : ffff800025048a20
[ 26.189006] x7 : ffff8000250481c0 x6 : ffff80002ffe9118
[ 26.191359] x5 : ffff80002ffe9118 x4 : 0000000000000000
[ 26.193863] x3 : ffff80002ffefe98 x2 : 44c06ddd107d1f00
[ 26.196642] x1 : 0000000000000000 x0 : 000000000000003e
[ 26.198892] Call trace:
[ 26.199893] io_mem_free+0x9c/0xa8
[ 26.201155] io_ring_ctx_wait_and_kill+0xec/0x180
[ 26.202688] io_uring_setup+0x6c4/0x6f0
[ 26.204091] __arm64_sys_io_uring_setup+0x18/0x20
[ 26.205576] el0_svc_common.constprop.0+0x7c/0xe8
[ 26.207186] el0_svc_handler+0x28/0x78
[ 26.208389] el0_svc+0x8/0xc
[ 26.209408] Code: aa0203e0 d0006861 9133a021 97fcdc3c (d4210000)
[ 26.211995] ---[ end trace bdb81cd43a21e50d ]---
[ 81.770626] ------------[ cut here ]------------
[ 81.825015] virt_to_phys used for non-linear address: 000000000d42f2c7 ( (null))
[ 81.827860] WARNING: CPU: 1 PID: 30171 at arch/arm64/mm/physaddr.c:15 __virt_to_phys+0x48/0x68
[ 81.831202] Modules linked in:
[ 81.832212] CPU: 1 PID: 30171 Comm: syz-executor.20 Not tainted 5.1.0-rc7-00004-g7d30b2ea43d6 #19
[ 81.835616] Hardware name: linux,dummy-virt (DT)
[ 81.836863] pstate: 60400005 (nZCv daif +PAN -UAO)
[ 81.838727] pc : __virt_to_phys+0x48/0x68
[ 81.840572] lr : __virt_to_phys+0x48/0x68
[ 81.842264] sp : ffff80002cf67c70
[ 81.843858] x29: ffff80002cf67c70 x28: ffff800014358e18
[ 81.846463] x27: 0000000000000000 x26: 0000000020000080
[ 81.849148] x25: 0000000000000000 x24: ffff80001bb01f40
[ 81.851986] x23: ffff200011db06c8 x22: ffff2000127e3c60
[ 81.854351] x21: ffff800014358cc0 x20: ffff800014358d98
[ 81.856711] x19: 0000000000000000 x18: 0000000000000000
[ 81.859132] x17: 0000000000000000 x16: 0000000000000000
[ 81.861586] x15: 0000000000000000 x14: 0000000000000000
[ 81.863905] x13: 0000000000000000 x12: ffff1000037603e9
[ 81.866226] x11: 1ffff000037603e8 x10: 0000000000000980
[ 81.868776] x9 : ffff80002cf67840 x8 : ffff80001bb02920
[ 81.873272] x7 : ffff1000037603e9 x6 : ffff80001bb01f47
[ 81.875266] x5 : ffff1000037603e9 x4 : dfff200000000000
[ 81.876875] x3 : ffff200010087528 x2 : ffff1000059ecf58
[ 81.878751] x1 : 44c06ddd107d1f00 x0 : 0000000000000000
[ 81.880453] Call trace:
[ 81.881164] __virt_to_phys+0x48/0x68
[ 81.882919] io_mem_free+0x18/0x110
[ 81.886585] io_ring_ctx_wait_and_kill+0x13c/0x1f0
[ 81.891212] io_uring_setup+0xa60/0xad0
[ 81.892881] __arm64_sys_io_uring_setup+0x2c/0x38
[ 81.894398] el0_svc_common.constprop.0+0xac/0x150
[ 81.896306] el0_svc_handler+0x34/0x88
[ 81.897744] el0_svc+0x8/0xc
[ 81.898715] ---[ end trace b4a703802243cbba ]---
Fixes: 2b188cc1bb857a9d ("Add io_uring IO interface")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-block@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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In io_sq_offload_start(), we call cpu_possible() on an unbounded cpu
value from userspace. On v5.1-rc7 on arm64 with
CONFIG_DEBUG_PER_CPU_MAPS, this results in a splat:
WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 cpu_max_bits_warn include/linux/cpumask.h:121 [inline]
There was an attempt to fix this in commit:
917257daa0fea7a0 ("io_uring: only test SQPOLL cpu after we've verified it")
... by adding a check after the cpu value had been limited to NR_CPU_IDS
using array_index_nospec(). However, this left an unbound check at the
start of the function, for which the warning still fires.
Let's fix this correctly by checking that the cpu value is bound by
nr_cpu_ids before passing it to cpu_possible(). Note that only
nr_cpu_ids of a cpumask are guaranteed to exist at runtime, and
nr_cpu_ids can be significantly smaller than NR_CPUs. For example, an
arm64 defconfig has NR_CPUS=256, while my test VM has 4 vCPUs.
Following the intent from the commit message for 917257daa0fea7a0, the
check is moved under the SQ_AFF branch, which is the only branch where
the cpu values is consumed. The check is performed before bounding the
value with array_index_nospec() so that we don't silently accept bogus
cpu values from userspace, where array_index_nospec() would force these
values to 0.
I suspect we can remove the array_index_nospec() call entirely, but I've
conservatively left that in place, updated to use nr_cpu_ids to match
the prior check.
Tested on arm64 with the Syzkaller reproducer:
https://syzkaller.appspot.com/bug?extid=cd714a07c6de2bc34293
https://syzkaller.appspot.com/x/repro.syz?x=15d8b397200000
Full splat from before this patch:
WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 cpu_max_bits_warn include/linux/cpumask.h:121 [inline]
WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 cpumask_check include/linux/cpumask.h:128 [inline]
WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 cpumask_test_cpu include/linux/cpumask.h:344 [inline]
WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 io_sq_offload_start fs/io_uring.c:2244 [inline]
WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 io_uring_create fs/io_uring.c:2864 [inline]
WARNING: CPU: 1 PID: 27601 at include/linux/cpumask.h:121 io_uring_setup+0x1108/0x15a0 fs/io_uring.c:2916
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 27601 Comm: syz-executor.0 Not tainted 5.1.0-rc7 #3
Hardware name: linux,dummy-virt (DT)
Call trace:
dump_backtrace+0x0/0x2f0 include/linux/compiler.h:193
show_stack+0x20/0x30 arch/arm64/kernel/traps.c:158
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x110/0x190 lib/dump_stack.c:113
panic+0x384/0x68c kernel/panic.c:214
__warn+0x2bc/0x2c0 kernel/panic.c:571
report_bug+0x228/0x2d8 lib/bug.c:186
bug_handler+0xa0/0x1a0 arch/arm64/kernel/traps.c:956
call_break_hook arch/arm64/kernel/debug-monitors.c:301 [inline]
brk_handler+0x1d4/0x388 arch/arm64/kernel/debug-monitors.c:316
do_debug_exception+0x1a0/0x468 arch/arm64/mm/fault.c:831
el1_dbg+0x18/0x8c
cpu_max_bits_warn include/linux/cpumask.h:121 [inline]
cpumask_check include/linux/cpumask.h:128 [inline]
cpumask_test_cpu include/linux/cpumask.h:344 [inline]
io_sq_offload_start fs/io_uring.c:2244 [inline]
io_uring_create fs/io_uring.c:2864 [inline]
io_uring_setup+0x1108/0x15a0 fs/io_uring.c:2916
__do_sys_io_uring_setup fs/io_uring.c:2929 [inline]
__se_sys_io_uring_setup fs/io_uring.c:2926 [inline]
__arm64_sys_io_uring_setup+0x50/0x70 fs/io_uring.c:2926
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall arch/arm64/kernel/syscall.c:47 [inline]
el0_svc_common.constprop.0+0x148/0x2e0 arch/arm64/kernel/syscall.c:83
el0_svc_handler+0xdc/0x100 arch/arm64/kernel/syscall.c:129
el0_svc+0x8/0xc arch/arm64/kernel/entry.S:948
SMP: stopping secondary CPUs
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
CPU features: 0x002,23000438
Memory Limit: none
Rebooting in 1 seconds..
Fixes: 917257daa0fea7a0 ("io_uring: only test SQPOLL cpu after we've verified it")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-block@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Simplied the logic
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Currently we only post a cqe if we get an error OUTSIDE of submission.
For submission, we return the error directly through io_uring_enter().
This is a bit awkward for applications, and it makes more sense to
always post a cqe with an error, if the error happens on behalf of an
sqe.
This changes submission behavior a bit. io_uring_enter() returns -ERROR
for an error, and > 0 for number of sqes submitted. Before this change,
if you wanted to submit 8 entries and had an error on the 5th entry,
io_uring_enter() would return 4 (for number of entries successfully
submitted) and rewind the sqring. The application would then have to
peek at the sqring and figure out what was wrong with the head sqe, and
then skip it itself. With this change, we'll return 5 since we did
consume 5 sqes, and the last sqe (with the error) will result in a cqe
being posted with the error.
This makes the logic easier to handle in the application, and it cleans
up the submission part.
Suggested-by: Stefan Bühler <source@stbuehler.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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There is no operation to order with afterwards, and removing the flag is
not critical in any way.
There will always be a "race condition" where the application will
trigger IORING_ENTER_SQ_WAKEUP when it isn't actually needed.
Signed-off-by: Stefan Bühler <source@stbuehler.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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smp_store_release in io_commit_sqring already orders the store to
dropped before the update to SQ head.
Signed-off-by: Stefan Bühler <source@stbuehler.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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There is no operation before to order with.
Signed-off-by: Stefan Bühler <source@stbuehler.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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There is no operation afterwards to order with.
Signed-off-by: Stefan Bühler <source@stbuehler.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The memory operations before reading cq head are unrelated and we
don't care about their order.
Document that the control dependency in combination with READ_ONCE and
WRITE_ONCE forms a barrier we need.
Signed-off-by: Stefan Bühler <source@stbuehler.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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wq_has_sleeper has a full barrier internally. The smp_rmb barrier in
io_uring_poll synchronizes with it.
Signed-off-by: Stefan Bühler <source@stbuehler.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The application reading the CQ ring needs a barrier to pair with the
smp_store_release in io_commit_cqring, not the barrier after it.
Also a write barrier *after* writing something (but not *before*
writing anything interesting) doesn't order anything, so an smp_wmb()
after writing SQ tail is not needed.
Additionally consider reading SQ head and writing CQ tail in the notes.
Also add some clarifications how the various other fields in the ring
buffers are used.
Signed-off-by: Stefan Bühler <source@stbuehler.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Not all request types set REQ_F_FORCE_NONBLOCK when they needed async
punting; reverse logic instead and set REQ_F_NOWAIT if request mustn't
be punted.
Signed-off-by: Stefan Bühler <source@stbuehler.de>
Merged with my previous patch for this.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI fixes from Bjorn Helgaas:
"I apologize for sending these so late in the cycle. We went back and
forth about how to deal with the unexpected logging of intentional
link state changes and finally decided to just config them off by
default.
PCI fixes:
- Stop ignoring "pci=disable_acs_redir" parameter (Logan Gunthorpe)
- Use shared MSI/MSI-X vector for Link Bandwidth Management (Alex
Williamson)
- Add Kconfig option for Link Bandwidth notification messages (Keith
Busch)"
* tag 'pci-v5.1-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
PCI/LINK: Add Kconfig option (default off)
PCI/portdrv: Use shared MSI/MSI-X vector for Bandwidth Management
PCI: Fix issue with "pci=disable_acs_redir" parameter being ignored
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e8303bb7a75c ("PCI/LINK: Report degraded links via link bandwidth
notification") added dmesg logging whenever a link changes speed or width
to a state that is considered degraded. Unfortunately, it cannot
differentiate signal integrity-related link changes from those
intentionally initiated by an endpoint driver, including drivers that may
live in userspace or VMs when making use of vfio-pci. Some GPU drivers
actively manage the link state to save power, which generates a stream of
messages like this:
vfio-pci 0000:07:00.0: 32.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s x16 link at 0000:00:02.0 (capable of 64.000 Gb/s with 5 GT/s x16 link)
Since we can't distinguish the intentional changes from the signal
integrity issues, leave the reporting turned off by default. Add a Kconfig
option to turn it on if desired.
Fixes: e8303bb7a75c ("PCI/LINK: Report degraded links via link bandwidth notification")
Link: https://lore.kernel.org/linux-pci/20190501142942.26972-1-keith.busch@intel.com
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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The Interrupt Message Number in the PCIe Capabilities register (PCIe r4.0,
sec 7.5.3.2) indicates which MSI/MSI-X vector is shared by interrupts
related to the PCIe Capability, including Link Bandwidth Management and
Link Autonomous Bandwidth Interrupts (Link Control, 7.5.3.7), Command
Completed and Hot-Plug Interrupts (Slot Control, 7.5.3.10), and the PME
Interrupt (Root Control, 7.5.3.12).
pcie_message_numbers() checked whether we want to enable PME or Hot-Plug
interrupts but neglected to check for Link Bandwidth Management, so if we
only wanted the Bandwidth Management interrupts, it decided we didn't need
any vectors at all. Then pcie_port_enable_irq_vec() tried to reallocate
zero vectors, which failed, resulting in fallback to INTx.
On some systems, e.g., an X79-based workstation, that INTx seems broken or
not handled correctly, so we got spurious IRQ16 interrupts for Bandwidth
Management events.
Change pcie_message_numbers() so that if we want Link Bandwidth Management
interrupts, we use the shared MSI/MSI-X vector from the PCIe Capabilities
register.
Fixes: e8303bb7a75c ("PCI/LINK: Report degraded links via link bandwidth notification")
Link: https://lore.kernel.org/lkml/155597243666.19387.1205950870601742062.stgit@gimli.home
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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