- 05 Dec, 2018 40 commits
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Ilya Dryomov authored
commit f1d10e04 upstream. Allow for extending ceph_x_authorize_reply in the future. Signed-off-by:
Ilya Dryomov <idryomov@gmail.com> Reviewed-by:
Sage Weil <sage@redhat.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Todd Kjos authored
commit 7bada55a upstream. Malicious code can attempt to free buffers using the BC_FREE_BUFFER ioctl to binder. There are protections against a user freeing a buffer while in use by the kernel, however there was a window where BC_FREE_BUFFER could be used to free a recently allocated buffer that was not completely initialized. This resulted in a use-after-free detected by KASAN with a malicious test program. This window is closed by setting the buffer's allow_user_free attribute to 0 when the buffer is allocated or when the user has previously freed it instead of waiting for the caller to set it. The problem was that when the struct buffer was recycled, allow_user_free was stale and set to 1 allowing a free to go through. Signed-off-by:
Todd Kjos <tkjos@google.com> Acked-by:
Arve Hjønnevåg <arve@android.com> Cc: stable <stable@vger.kernel.org> # 4.14 Signed-off-by:
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YueHaibing authored
commit 6484a677 upstream. gcc '-Wunused-but-set-variable' warning: drivers/misc/mic/scif/scif_rma.c: In function 'scif_create_remote_lookup': drivers/misc/mic/scif/scif_rma.c:373:25: warning: variable 'vmalloc_num_pages' set but not used [-Wunused-but-set-variable] 'vmalloc_num_pages' should be used to determine if the address is within the vmalloc range. Fixes: ba612aa8 ("misc: mic: SCIF memory registration and unregistration") Signed-off-by:
YueHaibing <yuehaibing@huawei.com> Cc: stable <stable@vger.kernel.org> Signed-off-by:
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Dexuan Cui authored
commit eceb0596 upstream. This is a longstanding issue: if the vmbus upper-layer drivers try to consume too many GPADLs, the host may return with an error 0xC0000044 (STATUS_QUOTA_EXCEEDED), but currently we forget to check the creation_status, and hence we can pass an invalid GPADL handle into the OPEN_CHANNEL message, and get an error code 0xc0000225 in open_info->response.open_result.status, and finally we hang in vmbus_open() -> "goto error_free_info" -> vmbus_teardown_gpadl(). With this patch, we can exit gracefully on STATUS_QUOTA_EXCEEDED. Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: K. Y. Srinivasan <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by:
Dexuan Cui <decui@microsoft.com> Signed-off-by:
K. Y. Srinivasan <kys@microsoft.com> Signed-off-by:
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Yu Zhao authored
commit c1cb20d4 upstream. We changed the key of swap cache tree from swp_entry_t.val to swp_offset. We need to do so in shmem_replace_page() as well. Hugh said: "shmem_replace_page() has been wrong since the day I wrote it: good enough to work on swap "type" 0, which is all most people ever use (especially those few who need shmem_replace_page() at all), but broken once there are any non-0 swp_type bits set in the higher order bits" Link: http://lkml.kernel.org/r/20181121215442.138545-1-yuzhao@google.com Fixes: f6ab1f7f ("mm, swap: use offset of swap entry as key of swap cache") Signed-off-by:
Yu Zhao <yuzhao@google.com> Reviewed-by:
Matthew Wilcox <willy@infradead.org> Acked-by:
Hugh Dickins <hughd@google.com> Cc: <stable@vger.kernel.org> [4.9+] Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Luis Chamberlain authored
commit 5618cf03 upstream. We free the misc device string twice on rmmod; fix this. Without this we cannot remove the module without crashing. Link: http://lkml.kernel.org/r/20181124050500.5257-1-mcgrof@kernel.orgSigned-off-by:
Luis Chamberlain <mcgrof@kernel.org> Reported-by:
Randy Dunlap <rdunlap@infradead.org> Reviewed-by:
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Martin Kelly authored
commit fe5192ac upstream. Currently, we enable the device before we enable the device trigger. At high frequencies, this can cause interrupts that don't yet have a poll function associated with them and are thus treated as spurious. At high frequencies with level interrupts, this can even cause an interrupt storm of repeated spurious interrupts (~100,000 on my Beagleboard with the LSM9DS1 magnetometer). If these repeat too much, the interrupt will get disabled and the device will stop functioning. To prevent these problems, enable the device prior to enabling the device trigger, and disable the divec prior to disabling the trigger. This means there's no window of time during which the device creates interrupts but we have no trigger to answer them. Fixes: 90efe055 ("iio: st_sensors: harden interrupt handling") Signed-off-by:
Martin Kelly <martin@martingkelly.com> Tested-by:
Denis Ciocca <denis.ciocca@st.com> Cc: <Stable@vger.kernel.org> Signed-off-by:
Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by:
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Felipe Balbi authored
commit 38317f5c upstream. This reverts commit ffb80fc6. Turns out that commit is wrong. Host controllers are allowed to use Clear Feature HALT as means to sync data toggle between host and periperal. Cc: <stable@vger.kernel.org> Signed-off-by:
Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by:
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Michael Niewöhner authored
commit effd14f6 upstream. Cherry G230 Stream 2.0 (G85-231) and 3.0 (G85-232) need this quirk to function correctly. This fixes a but where double pressing numlock locks up the device completely with need to replug the keyboard. Signed-off-by:
Michael Niewöhner <linux@mniewoehner.de> Tested-by:
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Kai-Heng Feng authored
commit a84a1bcc upstream. There are two new Realtek card readers require ums-realtek to work correctly. Add the new IDs to support them. Signed-off-by:
Kai-Heng Feng <kai.heng.feng@canonical.com> Acked-by:
Alan Stern <stern@rowland.harvard.edu> Cc: stable <stable@vger.kernel.org> Signed-off-by:
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Larry Finger authored
commit 8561fb31 upstream. With Androidx86 8.1, wificond returns "failed to get nl80211_sta_info_tx_failed" and wificondControl returns "Invalid signal poll result from wificond". The fix is to OR sinfo->filled with BIT_ULL(NL80211_STA_INFO_TX_FAILED). This missing bit is apparently not needed with NetworkManager, but it does no harm in that case. Reported-and-Tested-by:
youling257 <youling257@gmail.com> Cc: linux-wireless@vger.kernel.org Cc: youling257 <youling257@gmail.com> Signed-off-by:
Larry Finger <Larry.Finger@lwfinger.net> Cc: stable <stable@vger.kernel.org> Signed-off-by:
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Ben Wolsieffer authored
commit 5a96b2d3 upstream. The compatibility ioctl wrapper for VCHIQ_IOC_AWAIT_COMPLETION assumes that the native ioctl always uses a message buffer and decrements msgbufcount. Certain message types do not use a message buffer and in this case msgbufcount is not decremented, and completion->header for the message is NULL. Because the wrapper unconditionally decrements msgbufcount, the calling process may assume that a message buffer has been used even when it has not. This results in a memory leak in the userspace code that interfaces with this driver. When msgbufcount is decremented, the userspace code assumes that the buffer can be freed though the reference in completion->header, which cannot happen when the reference is NULL. This patch causes the wrapper to only decrement msgbufcount when the native ioctl decrements it. Note that we cannot simply copy the native ioctl's value of msgbufcount, because the wrapper only retrieves messages from the native ioctl one at a time, while userspace may request multiple messages. See https://github.com/raspberrypi/linux/pull/2703 for more discussion of this patch. Fixes: 5569a126 ("staging: vchiq_arm: Add compatibility wrappers for ioctls") Signed-off-by:
Ben Wolsieffer <benwolsieffer@gmail.com> Acked-by:
Stefan Wahren <stefan.wahren@i2se.com> Cc: stable <stable@vger.kernel.org> Signed-off-by:
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Josef Bacik authored
We want to release the unused reservation we have since it refills the delayed refs reserve, which will make everything go smoother when running the delayed refs if we're short on our reservation. CC: stable@vger.kernel.org # 4.4+ Reviewed-by:
Omar Sandoval <osandov@fb.com> Reviewed-by:
Liu Bo <bo.liu@linux.alibaba.com> Reviewed-by:
Nikolay Borisov <nborisov@suse.com> Signed-off-by:
Josef Bacik <josef@toxicpanda.com> Signed-off-by:
David Sterba <dsterba@suse.com> Signed-off-by:
Sasha Levin <sashal@kernel.org>
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Richard Genoud authored
commit 77e75fda upstream. of_dma_controller_free() was not called on module onloading. This lead to a soft lockup: watchdog: BUG: soft lockup - CPU#0 stuck for 23s! Modules linked in: at_hdmac [last unloaded: at_hdmac] when of_dma_request_slave_channel() tried to call ofdma->of_dma_xlate(). Cc: stable@vger.kernel.org Fixes: bbe89c8e ("at_hdmac: move to generic DMA binding") Acked-by:
Ludovic Desroches <ludovic.desroches@microchip.com> Signed-off-by:
Richard Genoud <richard.genoud@gmail.com> Signed-off-by:
Vinod Koul <vkoul@kernel.org> Signed-off-by:
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Richard Genoud authored
commit 98f5f932 upstream. The leak was found when opening/closing a serial port a great number of time, increasing kmalloc-32 in slabinfo. Each time the port was opened, dma_request_slave_channel() was called. Then, in at_dma_xlate(), atslave was allocated with devm_kzalloc() and never freed. (Well, it was free at module unload, but that's not what we want). So, here, kzalloc is more suited for the job since it has to be freed in atc_free_chan_resources(). Cc: stable@vger.kernel.org Fixes: bbe89c8e ("at_hdmac: move to generic DMA binding") Reported-by:
Mario Forner <m.forner@be4energy.com> Suggested-by:
Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-by:
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Heiko Stuebner authored
commit 672e60b7 upstream. The Coreboot version on veyron ChromeOS devices seems to ignore memory@0 nodes when updating the available memory and instead inserts another memory node without the address. This leads to 4GB systems only ever be using 2GB as the memory@0 node takes precedence. So remove the @0 for veyron devices. Fixes: 0b639b81 ("ARM: dts: rockchip: Add missing unit name to memory nodes in rk3288 boards") Cc: stable@vger.kernel.org Reported-by:
Heikki Lindholm <holin@iki.fi> Signed-off-by:
Heiko Stuebner <heiko@sntech.de> Signed-off-by:
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Pan Bian authored
commit ecebf55d upstream. The function ext2_xattr_set calls brelse(bh) to drop the reference count of bh. After that, bh may be freed. However, following brelse(bh), it reads bh->b_data via macro HDR(bh). This may result in a use-after-free bug. This patch moves brelse(bh) after reading field. CC: stable@vger.kernel.org Signed-off-by:
Pan Bian <bianpan2016@163.com> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Anisse Astier authored
commit 8cd65271 upstream. MSI Cubi N 8GL (MS-B171) needs the same fixup as its older model, the MS-B120, in order for the headset mic to be properly detected. They both use a single 3-way jack for both mic and headset with an ALC283 codec, with the same pins used. Cc: stable@vger.kernel.org Signed-off-by:
Anisse Astier <anisse@astier.eu> Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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Kailang Yang authored
commit 1078bef0 upstream. This patch will enable ALC300. [ It's almost equivalent with other ALC269-compatible ones, and apparently has no loopback mixer -- tiwai ] Signed-off-by:
Kailang Yang <kailang@realtek.com> Cc: <stable@vger.kernel.org> Signed-off-by:
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Takashi Iwai authored
commit 9a20332a upstream. Some spurious calls of snd_free_pages() have been overlooked and remain in the error paths of sparc cs4231 driver code. Since runtime->dma_area is managed by the PCM core helper, we shouldn't release manually. Drop the superfluous calls. Reviewed-by:
Takashi Sakamoto <o-takashi@sakamocchi.jp> Cc: <stable@vger.kernel.org> Signed-off-by:
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Takashi Iwai authored
commit e1a7bfe3 upstream. The procedure for adding a user control element has some window opened for race against the concurrent removal of a user element. This was caught by syzkaller, hitting a KASAN use-after-free error. This patch addresses the bug by wrapping the whole procedure to add a user control element with the card->controls_rwsem, instead of only around the increment of card->user_ctl_count. This required a slight code refactoring, too. The function snd_ctl_add() is split to two parts: a core function to add the control element and a part calling it. The former is called from the function for adding a user control element inside the controls_rwsem. One change to be noted is that snd_ctl_notify() for adding a control element gets called inside the controls_rwsem as well while it was called outside the rwsem. But this should be OK, as snd_ctl_notify() takes another (finer) rwlock instead of rwsem, and the call of snd_ctl_notify() inside rwsem is already done in another code path. Reported-by: syzbot+dc09047bce3820621ba2@syzkaller.appspotmail.com Cc: <stable@vger.kernel.org> Signed-off-by:
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Takashi Iwai authored
commit 7194eda1 upstream. The function snd_ac97_put_spsa() gets the bit shift value from the associated private_value, but it extracts too much; the current code extracts 8 bit values in bits 8-15, but this is a combination of two nibbles (bits 8-11 and bits 12-15) for left and right shifts. Due to the incorrect bits extraction, the actual shift may go beyond the 32bit value, as spotted recently by UBSAN check: UBSAN: Undefined behaviour in sound/pci/ac97/ac97_codec.c:836:7 shift exponent 68 is too large for 32-bit type 'int' This patch fixes the shift value extraction by masking the properly with 0x0f instead of 0xff. Reported-and-tested-by:
Meelis Roos <mroos@linux.ee> Cc: <stable@vger.kernel.org> Signed-off-by:
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Takashi Iwai authored
commit 7b691541 upstream. Some spurious calls of snd_free_pages() have been overlooked and remain in the error paths of wss driver code. Since runtime->dma_area is managed by the PCM core helper, we shouldn't release manually. Drop the superfluous calls. Reviewed-by:
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Maximilian Heyne authored
commit 41e817bc upstream. commit e2592217 ("fs: simplify the generic_write_sync prototype") reworked callers of generic_write_sync(), and ended up dropping the error return for the directio path. Prior to that commit, in dio_complete(), an error would be bubbled up the stack, but after that commit, errors passed on to dio_complete were eaten up. This was reported on the list earlier, and a fix was proposed in https://lore.kernel.org/lkml/20160921141539.GA17898@infradead.org/, but never followed up with. We recently hit this bug in our testing where fencing io errors, which were previously erroring out with EIO, were being returned as success operations after this commit. The fix proposed on the list earlier was a little short -- it would have still called generic_write_sync() in case `ret` already contained an error. This fix ensures generic_write_sync() is only called when there's no pending error in the write. Additionally, transferred is replaced with ret to bring this code in line with other callers. Fixes: e2592217 ("fs: simplify the generic_write_sync prototype") Reported-by:
Ravi Nankani <rnankani@amazon.com> Signed-off-by:
Maximilian Heyne <mheyne@amazon.de> Reviewed-by:
Christoph Hellwig <hch@lst.de> CC: Torsten Mehlan <tomeh@amazon.de> CC: Uwe Dannowski <uwed@amazon.de> CC: Amit Shah <aams@amazon.de> CC: David Woodhouse <dwmw@amazon.co.uk> CC: stable@vger.kernel.org Signed-off-by:
Jens Axboe <axboe@kernel.dk> Signed-off-by:
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Jiri Olsa authored
commit 67266c10 upstream. Currently we check the branch tracing only by checking for the PERF_COUNT_HW_BRANCH_INSTRUCTIONS event of PERF_TYPE_HARDWARE type. But we can define the same event with the PERF_TYPE_RAW type. Changing the intel_pmu_has_bts() code to check on event's final hw config value, so both HW types are covered. Adding unlikely to intel_pmu_has_bts() condition calls, because it was used in the original code in intel_bts_constraints. Signed-off-by:
Jiri Olsa <jolsa@kernel.org> Acked-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: <stable@vger.kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Link: http://lkml.kernel.org/r/20181121101612.16272-2-jolsa@kernel.orgSigned-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
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Jiri Olsa authored
commit ed6101bb upstream. Moving branch tracing setup to Intel core object into separate intel_pmu_bts_config function, because it's Intel specific. Suggested-by:
Peter Zijlstra <peterz@infradead.org> Signed-off-by:
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Sebastian Andrzej Siewior authored
commit 68239654 upstream. The sequence fpu->initialized = 1; /* step A */ preempt_disable(); /* step B */ fpu__restore(fpu); preempt_enable(); in __fpu__restore_sig() is racy in regard to a context switch. For 32bit frames, __fpu__restore_sig() prepares the FPU state within fpu->state. To ensure that a context switch (switch_fpu_prepare() in particular) does not modify fpu->state it uses fpu__drop() which sets fpu->initialized to 0. After fpu->initialized is cleared, the CPU's FPU state is not saved to fpu->state during a context switch. The new state is loaded via fpu__restore(). It gets loaded into fpu->state from userland and ensured it is sane. fpu->initialized is then set to 1 in order to avoid fpu__initialize() doing anything (overwrite the new state) which is part of fpu__restore(). A context switch between step A and B above would save CPU's current FPU registers to fpu->state and overwrite the newly prepared state. This looks like a tiny race window but the Kernel Test Robot reported this back in 2016 while we had lazy FPU support. Borislav Petkov made the link between that report and another patch that has been posted. Since the removal of the lazy FPU support, this race goes unnoticed because the warning has been removed. Disable bottom halves around the restore sequence to avoid the race. BH need to be disabled because BH is allowed to run (even with preemption disabled) and might invoke kernel_fpu_begin() by doing IPsec. [ bp: massage commit message a bit. ] Signed-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
Borislav Petkov <bp@suse.de> Acked-by:
Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Jason A. Donenfeld" <Jason@zx2c4.com> Cc: kvm ML <kvm@vger.kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Rik van Riel <riel@surriel.com> Cc: stable@vger.kernel.org Cc: x86-ml <x86@kernel.org> Link: http://lkml.kernel.org/r/20181120102635.ddv3fvavxajjlfqk@linutronix.de Link: https://lkml.kernel.org/r/20160226074940.GA28911@pd.tnicSigned-off-by:
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Borislav Petkov authored
commit 60c8144a upstream. Currently, the code sets up the thresholding interrupt vector and only then goes about initializing the thresholding banks. Which is wrong, because an early thresholding interrupt would cause a NULL pointer dereference when accessing those banks and prevent the machine from booting. Therefore, set the thresholding interrupt vector only *after* having initialized the banks successfully. Fixes: 18807ddb ("x86/mce/AMD: Reset Threshold Limit after logging error") Reported-by:
Rafał Miłecki <rafal@milecki.pl> Reported-by:
John Clemens <clemej@gmail.com> Signed-off-by:
John Clemens <john@deater.net> Cc: Aravind Gopalakrishnan <aravindksg.lkml@gmail.com> Cc: linux-edac@vger.kernel.org Cc: stable@vger.kernel.org Cc: Tony Luck <tony.luck@intel.com> Cc: x86@kernel.org Cc: Yazen Ghannam <Yazen.Ghannam@amd.com> Link: https://lkml.kernel.org/r/20181127101700.2964-1-zajec5@gmail.com Link: https://bugzilla.kernel.org/show_bug.cgi?id=201291Signed-off-by:
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Christoph Muellner authored
commit c1d91f86 upstream. This patch fixes the wrong polarity setting for the PCIe host driver's pre-reset pin for rk3399-puma-haikou. Without this patch link training will most likely fail. Fixes: 60fd9f72 ("arm64: dts: rockchip: add Haikou baseboard with RK3399-Q7 SoM") Cc: stable@vger.kernel.org Signed-off-by:
Christoph Muellner <christoph.muellner@theobroma-systems.com> Signed-off-by:
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Hou Zhiqiang authored
commit c6fd6fe9 upstream. The order of parameters is not correct when invoking the outbound window disable routine. Fix it. Fixes: 4a2745d7 ("PCI: layerscape: Disable outbound windows configured by bootloader") Signed-off-by:
Hou Zhiqiang <Zhiqiang.Hou@nxp.com> [lorenzo.pieralisi@arm.com: commit log] Signed-off-by:
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: stable@vger.kernel.org Signed-off-by:
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Pan Bian authored
commit 42a657f5 upstream. The function relocate_block_group calls btrfs_end_transaction to release trans when update_backref_cache returns 1, and then continues the loop body. If btrfs_block_rsv_refill fails this time, it will jump out the loop and the freed trans will be accessed. This may result in a use-after-free bug. The patch assigns NULL to trans after trans is released so that it will not be accessed. Fixes: 0647bf56 ("Btrfs: improve forever loop when doing balance relocation") CC: stable@vger.kernel.org # 4.4+ Reviewed-by:
Qu Wenruo <wqu@suse.com> Signed-off-by:
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Filipe Manana authored
commit f505754f upstream. We were using the path name received from user space without checking that it is null terminated. While btrfs-progs is well behaved and does proper validation and null termination, someone could call the ioctl and pass a non-null terminated patch, leading to buffer overrun problems in the kernel. The ioctl is protected by CAP_SYS_ADMIN. So just set the last byte of the path to a null character, similar to what we do in other ioctls (add/remove/resize device, snapshot creation, etc). CC: stable@vger.kernel.org # 4.4+ Reviewed-by:
Anand Jain <anand.jain@oracle.com> Signed-off-by:
Filipe Manana <fdmanana@suse.com> Reviewed-by:
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Max Filippov authored
commit 38a35a78 upstream. Layout of coprocessor registers in the elf_xtregs_t and xtregs_coprocessor_t may be different due to alignment. Thus it is not always possible to copy data between the xtregs_coprocessor_t structure and the elf_xtregs_t and get correct values for all registers. Use a table of offsets and sizes of individual coprocessor register groups to do coprocessor context copying in the ptrace_getxregs and ptrace_setxregs. This fixes incorrect coprocessor register values reading from the user process by the native gdb on an xtensa core with multiple coprocessors and registers with high alignment requirements. Cc: stable@vger.kernel.org Signed-off-by:
Max Filippov <jcmvbkbc@gmail.com> Signed-off-by:
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Max Filippov authored
commit 03bc996a upstream. Coprocessor context offsets are used by the assembly code that moves coprocessor context between the individual fields of the thread_info::xtregs_cp structure and coprocessor registers. This fixes coprocessor context clobbering on flushing and reloading during normal user code execution and user process debugging in the presence of more than one coprocessor in the core configuration. Cc: stable@vger.kernel.org Signed-off-by:
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Max Filippov authored
commit 2958b666 upstream. coprocessor_flush_all may be called from a context of a thread that is different from the thread being flushed. In that case contents of the cpenable special register may not match ti->cpenable of the target thread, resulting in unhandled coprocessor exception in the kernel context. Set cpenable special register to the ti->cpenable of the target register for the duration of the flush and restore it afterwards. This fixes the following crash caused by coprocessor register inspection in native gdb: (gdb) p/x $w0 Illegal instruction in kernel: sig: 9 [#1] PREEMPT Call Trace: ___might_sleep+0x184/0x1a4 __might_sleep+0x41/0xac exit_signals+0x14/0x218 do_exit+0xc9/0x8b8 die+0x99/0xa0 do_illegal_instruction+0x18/0x6c common_exception+0x77/0x77 coprocessor_flush+0x16/0x3c arch_ptrace+0x46c/0x674 sys_ptrace+0x2ce/0x3b4 system_call+0x54/0x80 common_exception+0x77/0x77 note: gdb[100] exited with preempt_count 1 Killed Cc: stable@vger.kernel.org Signed-off-by:
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Wanpeng Li authored
commit e97f852f upstream. Reported by syzkaller: BUG: unable to handle kernel NULL pointer dereference at 00000000000001c8 PGD 80000003ec4da067 P4D 80000003ec4da067 PUD 3f7bfa067 PMD 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 7 PID: 5059 Comm: debug Tainted: G OE 4.19.0-rc5 #16 RIP: 0010:__lock_acquire+0x1a6/0x1990 Call Trace: lock_acquire+0xdb/0x210 _raw_spin_lock+0x38/0x70 kvm_ioapic_scan_entry+0x3e/0x110 [kvm] vcpu_enter_guest+0x167e/0x1910 [kvm] kvm_arch_vcpu_ioctl_run+0x35c/0x610 [kvm] kvm_vcpu_ioctl+0x3e9/0x6d0 [kvm] do_vfs_ioctl+0xa5/0x690 ksys_ioctl+0x6d/0x80 __x64_sys_ioctl+0x1a/0x20 do_syscall_64+0x83/0x6e0 entry_SYSCALL_64_after_hwframe+0x49/0xbe The reason is that the testcase writes hyperv synic HV_X64_MSR_SINT6 msr and triggers scan ioapic logic to load synic vectors into EOI exit bitmap. However, irqchip is not initialized by this simple testcase, ioapic/apic objects should not be accessed. This can be triggered by the following program: #define _GNU_SOURCE #include <endian.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/syscall.h> #include <sys/types.h> #include <unistd.h> uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); long res = 0; memcpy((void*)0x20000040, "/dev/kvm", 9); res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000040, 0, 0); if (res != -1) r[0] = res; res = syscall(__NR_ioctl, r[0], 0xae01, 0); if (res != -1) r[1] = res; res = syscall(__NR_ioctl, r[1], 0xae41, 0); if (res != -1) r[2] = res; memcpy( (void*)0x20000080, "\x01\x00\x00\x00\x00\x5b\x61\xbb\x96\x00\x00\x40\x00\x00\x00\x00\x01\x00" "\x08\x00\x00\x00\x00\x00\x0b\x77\xd1\x78\x4d\xd8\x3a\xed\xb1\x5c\x2e\x43" "\xaa\x43\x39\xd6\xff\xf5\xf0\xa8\x98\xf2\x3e\x37\x29\x89\xde\x88\xc6\x33" "\xfc\x2a\xdb\xb7\xe1\x4c\xac\x28\x61\x7b\x9c\xa9\xbc\x0d\xa0\x63\xfe\xfe" "\xe8\x75\xde\xdd\x19\x38\xdc\x34\xf5\xec\x05\xfd\xeb\x5d\xed\x2e\xaf\x22" "\xfa\xab\xb7\xe4\x42\x67\xd0\xaf\x06\x1c\x6a\x35\x67\x10\x55\xcb", 106); syscall(__NR_ioctl, r[2], 0x4008ae89, 0x20000080); syscall(__NR_ioctl, r[2], 0xae80, 0); return 0; } This patch fixes it by bailing out scan ioapic if ioapic is not initialized in kernel. Reported-by:
Wei Wu <ww9210@gmail.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Wei Wu <ww9210@gmail.com> Signed-off-by:
Wanpeng Li <wanpengli@tencent.com> Cc: stable@vger.kernel.org Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
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Liran Alon authored
commit bcbfbd8e upstream. kvm_pv_clock_pairing() allocates local var "struct kvm_clock_pairing clock_pairing" on stack and initializes all it's fields besides padding (clock_pairing.pad[]). Because clock_pairing var is written completely (including padding) to guest memory, failure to init struct padding results in kernel info-leak. Fix the issue by making sure to also init the padding with zeroes. Fixes: 55dd00a7 ("KVM: x86: add KVM_HC_CLOCK_PAIRING hypercall") Reported-by: syzbot+a8ef68d71211ba264f56@syzkaller.appspotmail.com Reviewed-by:
Mark Kanda <mark.kanda@oracle.com> Signed-off-by:
Liran Alon <liran.alon@oracle.com> Cc: stable@vger.kernel.org Signed-off-by:
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Jim Mattson authored
commit fd65d314 upstream. Previously, we only called indirect_branch_prediction_barrier on the logical CPU that freed a vmcb. This function should be called on all logical CPUs that last loaded the vmcb in question. Fixes: 15d45071 ("KVM/x86: Add IBPB support") Reported-by:
Neel Natu <neelnatu@google.com> Signed-off-by:
Jim Mattson <jmattson@google.com> Reviewed-by:
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: stable@vger.kernel.org Signed-off-by:
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Junaid Shahid authored
commit 0e0fee5c upstream. When a guest page table is updated via an emulated write, kvm_mmu_pte_write() is called to update the shadow PTE using the just written guest PTE value. But if two emulated guest PTE writes happened concurrently, it is possible that the guest PTE and the shadow PTE end up being out of sync. Emulated writes do not mark the shadow page as unsync-ed, so this inconsistency will not be resolved even by a guest TLB flush (unless the page was marked as unsync-ed at some other point). This is fixed by re-reading the current value of the guest PTE after the MMU lock has been acquired instead of just using the value that was written prior to calling kvm_mmu_pte_write(). Signed-off-by:
Junaid Shahid <junaids@google.com> Reviewed-by:
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Thomas Gleixner authored
commit 55a97402 upstream Provide the possibility to enable IBPB always in combination with 'prctl' and 'seccomp'. Add the extra command line options and rework the IBPB selection to evaluate the command instead of the mode selected by the STIPB switch case. Signed-off-by:
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