- 11 Aug, 2017 37 commits
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Neal Cardwell authored
[ Upstream commit f19fd62d ] Introduce a helper to convert a BBR bandwidth and gain factor to a pacing rate in bytes per second. This is a pure refactor, but is needed for two following fixes. Fixes: 0f8782ea ("tcp_bbr: add BBR congestion control") Signed-off-by:
Neal Cardwell <ncardwell@google.com> Signed-off-by:
Yuchung Cheng <ycheng@google.com> Signed-off-by:
Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Neal Cardwell authored
[ Upstream commit 4aea287e ] In bbr_set_pacing_rate(), which decides whether to cut the pacing rate, there was some code that considered exiting STARTUP to be equivalent to the notion of filling the pipe (i.e., bbr_full_bw_reached()). Specifically, as the code was structured, exiting STARTUP and going into PROBE_RTT could cause us to cut the pacing rate down to something silly and low, based on whatever bandwidth samples we've had so far, when it's possible that all of them have been small app-limited bandwidth samples that are not representative of the bandwidth available in the path. (The code was correct at the time it was written, but the state machine changed without this spot being adjusted correspondingly.) Fixes: 0f8782ea ("tcp_bbr: add BBR congestion control") Signed-off-by:
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Steven Toth authored
commit 6fb05e0d upstream. Avoid a double fetch by reusing the values from the prior transfer. Originally reported via https://bugzilla.kernel.org/show_bug.cgi?id=195559 Thanks to Pengfei Wang <wpengfeinudt@gmail.com> for reporting. Signed-off-by:
Steven Toth <stoth@kernellabs.com> Reported-by:
Pengfei Wang <wpengfeinudt@gmail.com> Signed-off-by:
Mauro Carvalho Chehab <mchehab@s-opensource.com> Cc: Eduardo Valentin <eduval@amazon.com> Signed-off-by:
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Omar Sandoval authored
commit 17024ad0 upstream. If a lot of metadata is reserved for outstanding delayed allocations, we rely on shrink_delalloc() to reclaim metadata space in order to fulfill reservation tickets. However, shrink_delalloc() has a shortcut where if it determines that space can be overcommitted, it will stop early. This made sense before the ticketed enospc system, but now it means that shrink_delalloc() will often not reclaim enough space to fulfill any tickets, leading to an early ENOSPC. (Reservation tickets don't care about being able to overcommit, they need every byte accounted for.) Fix it by getting rid of the shortcut so that shrink_delalloc() reclaims all of the metadata it is supposed to. This fixes early ENOSPCs we were seeing when doing a btrfs receive to populate a new filesystem, as well as early ENOSPCs Christoph saw when doing a big cp -r onto Btrfs. Fixes: 957780eb ("Btrfs: introduce ticketed enospc infrastructure") Tested-by:
Christoph Anton Mitterer <mail@christoph.anton.mitterer.name> Reviewed-by:
Josef Bacik <jbacik@fb.com> Signed-off-by:
Omar Sandoval <osandov@fb.com> Signed-off-by:
David Sterba <dsterba@suse.com> Signed-off-by:
Nikolay Borisov <nborisov@suse.com> Signed-off-by:
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Jin Qian authored
commit 15d3042a upstream. Make sure segno and blkoff read from raw image are valid. Cc: stable@vger.kernel.org Signed-off-by:
Jin Qian <jinqian@google.com> [Jaegeuk Kim: adjust minor coding style] Signed-off-by:
Jaegeuk Kim <jaegeuk@kernel.org> [AmitP: Found in Android Security bulletin for Aug'17, fixes CVE-2017-10663] Signed-off-by:
Amit Pundir <amit.pundir@linaro.org> Signed-off-by:
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Sean Young authored
commit 9f5039ba upstream. Since commit e8f48188 ("[media] lirc: advertise LIRC_CAN_GET_REC_RESOLUTION and improve") lircd uses the ioctl LIRC_GET_REC_RESOLUTION to determine the shortest pulse or space that the hardware can detect. This breaks decoding in lirc because lircd expects the answer in microseconds, but nanoseconds is returned. Reported-by:
Derek <user.vdr@gmail.com> Tested-by:
Sean Young <sean@mess.org> Signed-off-by:
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David Woods authored
commit 73a47a9b upstream. Using the device_property interfaces allows mmc drivers to work on platforms which run on either device tree or ACPI. Signed-off-by:
David Woods <dwoods@mellanox.com> Reviewed-by:
Chris Metcalf <cmetcalf@mellanox.com> Signed-off-by:
Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by:
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David Woods authored
commit 852ff5fe upstream. Using the device_property interfaces allows the dw_mmc driver to work on platforms which run on either device tree or ACPI. Signed-off-by:
Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by:
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Nicholas Bellinger authored
commit 25cdda95 upstream. This patch fixes a OOPs originally introduced by: commit bb048357 Author: Nicholas Bellinger <nab@linux-iscsi.org> Date: Thu Sep 5 14:54:04 2013 -0700 iscsi-target: Add sk->sk_state_change to cleanup after TCP failure which would trigger a NULL pointer dereference when a TCP connection was closed asynchronously via iscsi_target_sk_state_change(), but only when the initial PDU processing in iscsi_target_do_login() from iscsi_np process context was blocked waiting for backend I/O to complete. To address this issue, this patch makes the following changes. First, it introduces some common helper functions used for checking socket closing state, checking login_flags, and atomically checking socket closing state + setting login_flags. Second, it introduces a LOGIN_FLAGS_INITIAL_PDU bit to know when a TCP connection has dropped via iscsi_target_sk_state_change(), but the initial PDU processing within iscsi_target_do_login() in iscsi_np context is still running. For this case, it sets LOGIN_FLAGS_CLOSED, but doesn't invoke schedule_delayed_work(). The original NULL pointer dereference case reported by MNC is now handled by iscsi_target_do_login() doing a iscsi_target_sk_check_close() before transitioning to FFP to determine when the socket has already closed, or iscsi_target_start_negotiation() if the login needs to exchange more PDUs (eg: iscsi_target_do_login returned 0) but the socket has closed. For both of these cases, the cleanup up of remaining connection resources will occur in iscsi_target_start_negotiation() from iscsi_np process context once the failure is detected. Finally, to handle to case where iscsi_target_sk_state_change() is called after the initial PDU procesing is complete, it now invokes conn->login_work -> iscsi_target_do_login_rx() to perform cleanup once existing iscsi_target_sk_check_close() checks detect connection failure. For this case, the cleanup of remaining connection resources will occur in iscsi_target_do_login_rx() from delayed workqueue process context once the failure is detected. Reported-by:
Mike Christie <mchristi@redhat.com> Reviewed-by:
Hannes Reinecke <hare@suse.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Sagi Grimberg <sagi@grimberg.me> Cc: Varun Prakash <varun@chelsio.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by:
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Prabhakar Lad authored
commit da05d52d upstream. this patch makes sure VPFE_CMD_S_CCDC_RAW_PARAMS ioctl no longer works for vpfe_capture driver with a minimal patch suitable for backporting. - This ioctl was never in public api and was only defined in kernel header. - The function set_params constantly mixes up pointers and phys_addr_t numbers. - This is part of a 'VPFE_CMD_S_CCDC_RAW_PARAMS' ioctl command that is described as an 'experimental ioctl that will change in future kernels'. - The code to allocate the table never gets called after we copy_from_user the user input over the kernel settings, and then compare them for inequality. - We then go on to use an address provided by user space as both the __user pointer for input and pass it through phys_to_virt to come up with a kernel pointer to copy the data to. This looks like a trivially exploitable root hole. Due to these reasons we make sure this ioctl now returns -EINVAL and backport this patch as far as possible. Fixes: 5f15fbb6 ("V4L/DVB (12251): v4l: dm644x ccdc module for vpfe capture driver") Signed-off-by:
Lad, Prabhakar <prabhakar.csengg@gmail.com> Signed-off-by:
Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by:
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Marc Gonzalez authored
commit 985333b0 upstream. RX and TX clock delays are required. Request them explicitly. Fixes: cad008b8 ("ARM: dts: tango4: Initial device trees") Signed-off-by:
Marc Gonzalez <marc_gonzalez@sigmadesigns.com> Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Gregory CLEMENT authored
commit 8d451417 upstream. As written in the datasheet the PCA955 can only handle low level irq and not edge irq. Without this fix the interrupt is not usable for pca955: the gpio-pca953x driver already set the irq type as low level which is incompatible with edge type, then the kernel prevents using the interrupt: "irq: type mismatch, failed to map hwirq-18 for /soc/internal-regs/gpio@18100!" Fixes: 928413bd ("ARM: mvebu: Add Armada 388 General Purpose Development Board support") Signed-off-by:
Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by:
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Jerry Lee authored
commit aec51758 upstream. On a 32-bit platform, the value of n_blcoks_count may be wrong during the file system is resized to size larger than 2^32 blocks. This may caused the superblock being corrupted with zero blocks count. Fixes: 1c6bd717Signed-off-by:
Jerry Lee <jerrylee@qnap.com> Signed-off-by:
Theodore Ts'o <tytso@mit.edu> Signed-off-by:
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Jan Kara authored
commit fcf5ea10 upstream. ext4_find_unwritten_pgoff() does not properly handle a situation when starting index is in the middle of a page and blocksize < pagesize. The following command shows the bug on filesystem with 1k blocksize: xfs_io -f -c "falloc 0 4k" \ -c "pwrite 1k 1k" \ -c "pwrite 3k 1k" \ -c "seek -a -r 0" foo In this example, neither lseek(fd, 1024, SEEK_HOLE) nor lseek(fd, 2048, SEEK_DATA) will return the correct result. Fix the problem by neglecting buffers in a page before starting offset. Reported-by:
Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Bartosz Golaszewski authored
commit df1e76f2 upstream. The previous fix for filtering out of unwatched events was not entirely correct. Instead of skipping the events we don't want, they are now interpreted as events with opposing edge. In order to fix it: always read the GPIO line value on interrupt and only emit the event if it corresponds with the event type we requested. Fixes: ad537b82 ("gpiolib: fix filtering out unwanted events") Signed-off-by:
Bartosz Golaszewski <brgl@bgdev.pl> Signed-off-by:
Linus Walleij <linus.walleij@linaro.org> Signed-off-by:
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Suravee Suthikulpanit authored
commit efe6f241 upstream. IRTE[GALogIntr] bit should set when enabling guest_mode, which enables IOMMU to generate entry in GALog when IRTE[IsRun] is not set, and send an interrupt to notify IOMMU driver. Signed-off-by:
Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Cc: Joerg Roedel <jroedel@suse.de> Fixes: d98de49a ('iommu/amd: Enable vAPIC interrupt remapping mode by default') Signed-off-by:
Joerg Roedel <jroedel@suse.de> Signed-off-by:
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Nicholas Piggin authored
commit 3db40c31 upstream. If the decrementer wraps again and de-asserts the decrementer exception while hard-disabled, __check_irq_replay() has a test to notice the wrap when interrupts are re-enabled. The decrementer check must be done when clearing the PACA_IRQ_HARD_DIS flag, not when the PACA_IRQ_DEC flag is tested. Previously this worked because the decrementer interrupt was always the first one checked after clearing the hard disable flag, but HMI check was moved ahead of that, which introduced this bug. This can cause a missed decrementer interrupt if we soft-disable interrupts then take an HMI which is recorded in irq_happened, then hard-disable interrupts for > 4s to wrap the decrementer. Fixes: e0e0d6b7 ("powerpc/64: Replay hypervisor maintenance interrupt first") Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
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Gustavo Romero authored
commit cd63f3cf upstream. Currently flush_tmregs_to_thread() does not save the TM SPRs (TFHAR, TFIAR, TEXASR) to the thread struct, unless the process is currently inside a suspended transaction. If the process is core dumping, and the TM SPRs have changed since the last time the process was context switched, then we will save stale values of the TM SPRs to the core dump. Fix it by saving the live register state to the thread struct in that case. Fixes: 08e1c01d ("powerpc/ptrace: Enable support for TM SPR state") Signed-off-by:
Gustavo Romero <gromero@linux.vnet.ibm.com> Reviewed-by:
Cyril Bur <cyrilbur@gmail.com> Signed-off-by:
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Matija Glavinic Pecotic authored
commit 34f41c03 upstream. For e.g. HZ=100, timer being 430 jiffies in the future, and 32 bit unsigned int, there is an overflow on unsigned int right-hand side of the expression which results with wrong values being returned. Type cast the multiplier to 64bit to avoid that issue. Fixes: 46c8f0b0 ("timers: Fix get_next_timer_interrupt() computation") Signed-off-by:
Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@nokia.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Reviewed-by:
Alexander Sverdlin <alexander.sverdlin@nokia.com> Cc: khilman@baylibre.com Cc: akpm@linux-foundation.org Link: http://lkml.kernel.org/r/a7900f04-2a21-c9fd-67be-ab334d459ee5@nokia.comSigned-off-by:
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Josh Poimboeuf authored
commit adb1fe9a upstream. Linus suggested we try to remove some of the low-hanging fruit related to kernel address exposure in dmesg. The only leaks I see on my local system are: Freeing SMP alternatives memory: 32K (ffffffff9e309000 - ffffffff9e311000) Freeing initrd memory: 10588K (ffffa0b736b42000 - ffffa0b737599000) Freeing unused kernel memory: 3592K (ffffffff9df87000 - ffffffff9e309000) Freeing unused kernel memory: 1352K (ffffa0b7288ae000 - ffffa0b728a00000) Freeing unused kernel memory: 632K (ffffa0b728d62000 - ffffa0b728e00000) Linus says: "I suspect we should just remove [the addresses in the 'Freeing' messages]. I'm sure they are useful in theory, but I suspect they were more useful back when the whole "free init memory" was originally done. These days, if we have a use-after-free, I suspect the init-mem situation is the easiest situation by far. Compared to all the dynamic allocations which are much more likely to show it anyway. So having debug output for that case is likely not all that productive." With this patch the freeing messages now look like this: Freeing SMP alternatives memory: 32K Freeing initrd memory: 10588K Freeing unused kernel memory: 3592K Freeing unused kernel memory: 1352K Freeing unused kernel memory: 632K Suggested-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/6836ff90c45b71d38e5d4405aec56fa9e5d1d4b2.1477405374.git.jpoimboe@redhat.comSigned-off-by:
Ingo Molnar <mingo@kernel.org> Cc: Kees Cook <keescook@google.com> Signed-off-by:
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Wanpeng Li authored
commit 337c017c upstream. WARNING: CPU: 5 PID: 1242 at kernel/rcu/tree_plugin.h:323 rcu_note_context_switch+0x207/0x6b0 CPU: 5 PID: 1242 Comm: unity-settings- Not tainted 4.13.0-rc2+ #1 RIP: 0010:rcu_note_context_switch+0x207/0x6b0 Call Trace: __schedule+0xda/0xba0 ? kvm_async_pf_task_wait+0x1b2/0x270 schedule+0x40/0x90 kvm_async_pf_task_wait+0x1cc/0x270 ? prepare_to_swait+0x22/0x70 do_async_page_fault+0x77/0xb0 ? do_async_page_fault+0x77/0xb0 async_page_fault+0x28/0x30 RIP: 0010:__d_lookup_rcu+0x90/0x1e0 I encounter this when trying to stress the async page fault in L1 guest w/ L2 guests running. Commit 9b132fbe (Add rcu user eqs exception hooks for async page fault) adds rcu_irq_enter/exit() to kvm_async_pf_task_wait() to exit cpu idle eqs when needed, to protect the code that needs use rcu. However, we need to call the pair even if the function calls schedule(), as seen from the above backtrace. This patch fixes it by informing the RCU subsystem exit/enter the irq towards/away from idle for both n.halted and !n.halted. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by:
Wanpeng Li <wanpeng.li@hotmail.com> Reviewed-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com> Signed-off-by:
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Banajit Goswami authored
commit b1cd2e34 upstream. Multiple frontend dailinks may be connected to a backend dailink at the same time. When one of frontend dailinks is closed, the associated backend dailink should not be closed if it is connected to other active frontend dailinks. Change ensures that backend dailink is closed only after all connected frontend dailinks are closed. Signed-off-by:
Gopikrishnaiah Anandan <agopik@codeaurora.org> Signed-off-by:
Banajit Goswami <bgoswami@codeaurora.org> Signed-off-by:
Patrick Lai <plai@codeaurora.org> Signed-off-by:
Mark Brown <broonie@kernel.org> Signed-off-by:
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Jean Delvare authored
commit 5694785c upstream. As I was staring at the si_init_golden_registers code, I noticed that the Pitcairn initialization silently falls through the Cape Verde initialization, and the Oland initialization falls through the Hainan initialization. However there is no comment stating that this is intentional, and the radeon driver doesn't have any such fallthrough, so I suspect this is not supposed to happen. Signed-off-by:
Jean Delvare <jdelvare@suse.de> Fixes: 62a37553 ("drm/amdgpu: add si implementation v10") Cc: Ken Wang <Qingqing.Wang@amd.com> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: "Marek Olšák" <maraeo@gmail.com> Cc: "Christian König" <christian.koenig@amd.com> Cc: Flora Cui <Flora.Cui@amd.com> Reviewed-by:
Marek Olšák <marek.olsak@amd.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
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Sergei A. Trusov authored
commit 3f3c3714 upstream. Sony VAIO VPCL14M1R needs the quirk to make the speaker working properly. Tested-by:
Dmitriy <mexx400@yandex.ru> Signed-off-by:
Sergei A. Trusov <sergei.a.trusov@ya.ru> Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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Dima Zavin authored
commit 89affbf5 upstream. In codepaths that use the begin/retry interface for reading mems_allowed_seq with irqs disabled, there exists a race condition that stalls the patch process after only modifying a subset of the static_branch call sites. This problem manifested itself as a deadlock in the slub allocator, inside get_any_partial. The loop reads mems_allowed_seq value (via read_mems_allowed_begin), performs the defrag operation, and then verifies the consistency of mem_allowed via the read_mems_allowed_retry and the cookie returned by xxx_begin. The issue here is that both begin and retry first check if cpusets are enabled via cpusets_enabled() static branch. This branch can be rewritted dynamically (via cpuset_inc) if a new cpuset is created. The x86 jump label code fully synchronizes across all CPUs for every entry it rewrites. If it rewrites only one of the callsites (specifically the one in read_mems_allowed_retry) and then waits for the smp_call_function(do_sync_core) to complete while a CPU is inside the begin/retry section with IRQs off and the mems_allowed value is changed, we can hang. This is because begin() will always return 0 (since it wasn't patched yet) while retry() will test the 0 against the actual value of the seq counter. The fix is to use two different static keys: one for begin (pre_enable_key) and one for retry (enable_key). In cpuset_inc(), we first bump the pre_enable key to ensure that cpuset_mems_allowed_begin() always return a valid seqcount if are enabling cpusets. Similarly, when disabling cpusets via cpuset_dec(), we first ensure that callers of cpuset_mems_allowed_retry() will start ignoring the seqcount value before we let cpuset_mems_allowed_begin() return 0. The relevant stack traces of the two stuck threads: CPU: 1 PID: 1415 Comm: mkdir Tainted: G L 4.9.36-00104-g540c51286237 #4 Hardware name: Default string Default string/Hardware, BIOS 4.29.1-20170526215256 05/26/2017 task: ffff8817f9c28000 task.stack: ffffc9000ffa4000 RIP: smp_call_function_many+0x1f9/0x260 Call Trace: smp_call_function+0x3b/0x70 on_each_cpu+0x2f/0x90 text_poke_bp+0x87/0xd0 arch_jump_label_transform+0x93/0x100 __jump_label_update+0x77/0x90 jump_label_update+0xaa/0xc0 static_key_slow_inc+0x9e/0xb0 cpuset_css_online+0x70/0x2e0 online_css+0x2c/0xa0 cgroup_apply_control_enable+0x27f/0x3d0 cgroup_mkdir+0x2b7/0x420 kernfs_iop_mkdir+0x5a/0x80 vfs_mkdir+0xf6/0x1a0 SyS_mkdir+0xb7/0xe0 entry_SYSCALL_64_fastpath+0x18/0xad ... CPU: 2 PID: 1 Comm: init Tainted: G L 4.9.36-00104-g540c51286237 #4 Hardware name: Default string Default string/Hardware, BIOS 4.29.1-20170526215256 05/26/2017 task: ffff8818087c0000 task.stack: ffffc90000030000 RIP: int3+0x39/0x70 Call Trace: <#DB> ? ___slab_alloc+0x28b/0x5a0 <EOE> ? copy_process.part.40+0xf7/0x1de0 __slab_alloc.isra.80+0x54/0x90 copy_process.part.40+0xf7/0x1de0 copy_process.part.40+0xf7/0x1de0 kmem_cache_alloc_node+0x8a/0x280 copy_process.part.40+0xf7/0x1de0 _do_fork+0xe7/0x6c0 _raw_spin_unlock_irq+0x2d/0x60 trace_hardirqs_on_caller+0x136/0x1d0 entry_SYSCALL_64_fastpath+0x5/0xad do_syscall_64+0x27/0x350 SyS_clone+0x19/0x20 do_syscall_64+0x60/0x350 entry_SYSCALL64_slow_path+0x25/0x25 Link: http://lkml.kernel.org/r/20170731040113.14197-1-dmitriyz@waymo.com Fixes: 46e700ab ("mm, page_alloc: remove unnecessary taking of a seqlock when cpusets are disabled") Signed-off-by:
Dima Zavin <dmitriyz@waymo.com> Reported-by:
Cliff Spradlin <cspradlin@waymo.com> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Christopher Lameter <cl@linux.com> Cc: Li Zefan <lizefan@huawei.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Mel Gorman authored
commit 3ea27719 upstream. Nadav Amit identified a theoritical race between page reclaim and mprotect due to TLB flushes being batched outside of the PTL being held. He described the race as follows: CPU0 CPU1 ---- ---- user accesses memory using RW PTE [PTE now cached in TLB] try_to_unmap_one() ==> ptep_get_and_clear() ==> set_tlb_ubc_flush_pending() mprotect(addr, PROT_READ) ==> change_pte_range() ==> [ PTE non-present - no flush ] user writes using cached RW PTE ... try_to_unmap_flush() The same type of race exists for reads when protecting for PROT_NONE and also exists for operations that can leave an old TLB entry behind such as munmap, mremap and madvise. For some operations like mprotect, it's not necessarily a data integrity issue but it is a correctness issue as there is a window where an mprotect that limits access still allows access. For munmap, it's potentially a data integrity issue although the race is massive as an munmap, mmap and return to userspace must all complete between the window when reclaim drops the PTL and flushes the TLB. However, it's theoritically possible so handle this issue by flushing the mm if reclaim is potentially currently batching TLB flushes. Other instances where a flush is required for a present pte should be ok as either the page lock is held preventing parallel reclaim or a page reference count is elevated preventing a parallel free leading to corruption. In the case of page_mkclean there isn't an obvious path that userspace could take advantage of without using the operations that are guarded by this patch. Other users such as gup as a race with reclaim looks just at PTEs. huge page variants should be ok as they don't race with reclaim. mincore only looks at PTEs. userfault also should be ok as if a parallel reclaim takes place, it will either fault the page back in or read some of the data before the flush occurs triggering a fault. Note that a variant of this patch was acked by Andy Lutomirski but this was for the x86 parts on top of his PCID work which didn't make the 4.13 merge window as expected. His ack is dropped from this version and there will be a follow-on patch on top of PCID that will include his ack. [akpm@linux-foundation.org: tweak comments] [akpm@linux-foundation.org: fix spello] Link: http://lkml.kernel.org/r/20170717155523.emckq2esjro6hf3z@suse.deReported-by:
Nadav Amit <nadav.amit@gmail.com> Signed-off-by:
Mel Gorman <mgorman@suse.de> Cc: Andy Lutomirski <luto@kernel.org> Signed-off-by:
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Guenter Roeck authored
commit 773dc118 upstream. HS400-ES devices fail to initialize with the following error messages. mmc1: power class selection to bus width 8 ddr 0 failed mmc1: error -110 whilst initialising MMC card This was seen on Samsung Chromebook Plus. Code analysis points to commit 3d4ef329 ("mmc: core: fix multi-bit bus width without high-speed mode"), which attempts to set the bus width for all but HS200 devices unconditionally. However, for HS400-ES, the bus width is already selected. Cc: Anssi Hannula <anssi.hannula@bitwise.fi> Cc: Douglas Anderson <dianders@chromium.org> Cc: Brian Norris <briannorris@chromium.org> Fixes: 3d4ef329 ("mmc: core: fix multi-bit bus width ...") Signed-off-by:
Guenter Roeck <linux@roeck-us.net> Reviewed-by:
Douglas Anderson <dianders@chromium.org> Reviewed-by:
Shawn Lin <shawn.lin@rock-chip.com> Tested-by:
Heiko Stuebner <heiko@sntech.de> Signed-off-by:
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Sakari Ailus authored
commit e44bb0cb upstream. The function to obtain a fwnode related to a struct device is useful for drivers that use the fwnode property API: it allows not being aware of the underlying firmware implementation. Signed-off-by:
Sakari Ailus <sakari.ailus@linux.intel.com> Reviewed-by:
Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Chris Metcalf <cmetcalf@mellanox.com> Signed-off-by:
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Ludovic Desroches authored
commit 7a1e3f14 upstream. When the device is non removable, the card detect signal is often used for another purpose i.e. muxed to another SoC peripheral or used as a GPIO. It could lead to wrong behaviors depending the default value of this signal if not muxed to the SDHCI controller. Fixes: bb5f8ea4 ("mmc: sdhci-of-at91: introduce driver for the Atmel SDMMC") Signed-off-by:
Ludovic Desroches <ludovic.desroches@microchip.com> Acked-by:
Adrian Hunter <adrian.hunter@intel.com> Signed-off-by:
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Trond Myklebust authored
commit fd40559c upstream. The verifier is allocated on the stack, but the EXCHANGE_ID RPC call was changed to be asynchronous by commit 8d89bd70. If we interrrupt the call to rpc_wait_for_completion_task(), we can therefore end up transmitting random stack contents in lieu of the verifier. Fixes: 8d89bd70 ("NFS setup async exchange_id") Signed-off-by:
Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by:
Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by:
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Arend Van Spriel authored
commit 5f5d0314 upstream. Due to a bugfix in wireless tree and the commit mentioned below a merge was needed which went haywire. So the submitted change resulted in the function brcmf_sdiod_sgtable_alloc() being called twice during the probe thus leaking the memory of the first call. Fixes: 4d792895 ("brcmfmac: switch to new platform data") Reported-by:
Stefan Wahren <stefan.wahren@i2se.com> Tested-by:
Hante Meuleman <hante.meuleman@broadcom.com> Signed-off-by:
Arend van Spriel <arend.vanspriel@broadcom.com> Signed-off-by:
Kalle Valo <kvalo@codeaurora.org> Signed-off-by:
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Emmanuel Grumbach authored
commit 0b0f934e upstream. iwlagn_check_ratid_empty takes the tid as a parameter, but it doesn't check that it is not IWL_TID_NON_QOS. Since IWL_TID_NON_QOS = 8 and iwl_priv::tid_data is an array with 8 entries, accessing iwl_priv::tid_data[IWL_TID_NON_QOS] is a bad idea. This happened in iwlagn_rx_reply_tx. Since iwlagn_check_ratid_empty is relevant only to check whether we can open A-MPDU, this flow is irrelevant if tid is IWL_TID_NON_QOS. Call iwlagn_check_ratid_empty only inside the if (tid != IWL_TID_NON_QOS) a few lines earlier in the function. Reported-by:
Seraphime Kirkovski <kirkseraph@gmail.com> Tested-by:
Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by:
Luca Coelho <luciano.coelho@intel.com> Signed-off-by:
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Tejun Heo authored
commit 5c0338c6 upstream. The combination of WQ_UNBOUND and max_active == 1 used to imply ordered execution. After NUMA affinity 4c16bd32 ("workqueue: implement NUMA affinity for unbound workqueues"), this is no longer true due to per-node worker pools. While the right way to create an ordered workqueue is alloc_ordered_workqueue(), the documentation has been misleading for a long time and people do use WQ_UNBOUND and max_active == 1 for ordered workqueues which can lead to subtle bugs which are very difficult to trigger. It's unlikely that we'd see noticeable performance impact by enforcing ordering on WQ_UNBOUND / max_active == 1 workqueues. Let's automatically set __WQ_ORDERED for those workqueues. Signed-off-by:
Tejun Heo <tj@kernel.org> Reported-by:
Christoph Hellwig <hch@infradead.org> Reported-by:
Alexei Potashnik <alexei@purestorage.com> Fixes: 4c16bd32 ("workqueue: implement NUMA affinity for unbound workqueues") Signed-off-by:
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Dan Carpenter authored
commit 59a5e266 upstream. My static checker complains that "devno" can be negative, meaning that we read before the start of the loop. I've looked at the code, and I think the warning is right. This come from /proc so it's root only or it would be quite a quite a serious bug. The call tree looks like this: proc_scsi_write() <- gets id and channel from simple_strtoul() -> scsi_add_single_device() <- calls shost->transportt->user_scan() -> ata_scsi_user_scan() -> ata_find_dev() Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
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Tejun Heo authored
commit 3c745417 upstream. While refactoring, f7b2814b ("cgroup: factor out cgroup_{apply|finalize}_control() from cgroup_subtree_control_write()") broke error return value from the function. The return value from the last operation is always overridden to zero. Fix it. Signed-off-by:
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Tejun Heo authored
commit 7af608e4 upstream. On subsystem registration, css_populate_dir() is not called on the new root css, so the interface files for the subsystem on cgrp_dfl_root aren't created on registration. This is a residue from the days when cgrp_dfl_root was used only as the parking spot for unused subsystems, which no longer is true as it's used as the root for cgroup2. This is often fine as later operations tend to create them as a part of mount (cgroup1) or subtree_control operations (cgroup2); however, it's not difficult to mount cgroup2 with the controller interface files missing as Waiman found out. Fix it by invoking css_populate_dir() on the root css on subsys registration. Signed-off-by:
Waiman Long <longman@redhat.com> Signed-off-by:
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John David Anglin authored
commit 13d57093 upstream. In testing James' patch to drivers/parisc/pdc_stable.c, I hit the BUG statement in flush_cache_range() during a system shutdown: kernel BUG at arch/parisc/kernel/cache.c:595! CPU: 2 PID: 6532 Comm: kworker/2:0 Not tainted 4.13.0-rc2+ #1 Workqueue: events free_ioctx IAOQ[0]: flush_cache_range+0x144/0x148 IAOQ[1]: flush_cache_page+0x0/0x1a8 RP(r2): flush_cache_range+0xec/0x148 Backtrace: [<00000000402910ac>] unmap_page_range+0x84/0x880 [<00000000402918f4>] unmap_single_vma+0x4c/0x60 [<0000000040291a18>] zap_page_range_single+0x110/0x160 [<0000000040291c34>] unmap_mapping_range+0x174/0x1a8 [<000000004026ccd8>] truncate_pagecache+0x50/0xa8 [<000000004026cd84>] truncate_setsize+0x54/0x70 [<000000004033d534>] put_aio_ring_file+0x44/0xb0 [<000000004033d5d8>] aio_free_ring+0x38/0x140 [<000000004033d714>] free_ioctx+0x34/0xa8 [<00000000401b0028>] process_one_work+0x1b8/0x4d0 [<00000000401b04f4>] worker_thread+0x1b4/0x648 [<00000000401b9128>] kthread+0x1b0/0x208 [<0000000040150020>] end_fault_vector+0x20/0x28 [<0000000040639518>] nf_ip_reroute+0x50/0xa8 [<0000000040638ed0>] nf_ip_route+0x10/0x78 [<0000000040638c90>] xfrm4_mode_tunnel_input+0x180/0x1f8 CPU: 2 PID: 6532 Comm: kworker/2:0 Not tainted 4.13.0-rc2+ #1 Workqueue: events free_ioctx Backtrace: [<0000000040163bf0>] show_stack+0x20/0x38 [<0000000040688480>] dump_stack+0xa8/0x120 [<0000000040163dc4>] die_if_kernel+0x19c/0x2b0 [<0000000040164d0c>] handle_interruption+0xa24/0xa48 This patch modifies flush_cache_range() to handle non current contexts. In as much as this occurs infrequently, the simplest approach is to flush the entire cache when this happens. Signed-off-by:
John David Anglin <dave.anglin@bell.net> Signed-off-by:
Helge Deller <deller@gmx.de> Signed-off-by:
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- 07 Aug, 2017 3 commits
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Greg Kroah-Hartman authored
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Patrick Lai authored
[ Upstream commit 9f169b9f ] When multiple front-ends are using the same back-end, putting state of a front-end to STOP state upon receiving pause command will result in backend stream getting released by DPCM framework unintentionally. In order to avoid backend to be released when another active front-end stream is present, put the stream state to PAUSED state instead of STOP state. Signed-off-by:
Sasha Levin <alexander.levin@verizon.com> Signed-off-by:
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Jeeja KP authored
[ Upstream commit bc65a326 ] Saved firmware ctx was not never released, so release Firmware ctx in cleanup routine. Signed-off-by:
Jeeja KP <jeeja.kp@intel.com> Acked-by:
Vinod Koul <vinod.koul@intel.com> Signed-off-by:
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