- 16 May, 2016 34 commits
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Takashi Iwai authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 50fd4987 upstream. We've got a regression report that the recording on Mac with a cirrus codec doesn't work any longer. This turned out to be the missing power up to D0 by power_save_node enablement. After analyzing the traces, we found out that the culprit is that the codec advertises the "actual" power state of a few nodes to be D0 while the "target" power state is D3. This inconsistency is usually OK, as it implies the power transition. But in the case of cirrus codec, this seems to be stuck to D3 while it's not actually D0. This patch addresses the issue by checking the power state difference more strictly. It sends the power-state change verb unless both the target and the actual power states show the given value. We may introduce yet another flag indicating the possible broken hardware power state, but it's anyway safer to set the proper power state even in a transition (at least it's harmless as long as the target state is same). So this simpler change was applied now. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=116171Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Kamal Mostafa <kamal@canonical.com>
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Tony Luck authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit ff15e95c upstream. In commit: eb1af3b7 ("Fix computation of channel address") I switched the "sck_way" variable from holding the log2 value read from the h/w to instead be the actual number. Unfortunately it is needed in log2 form when used to shift the address. Tested-by:
Patrick Geary <patrickg@supermicro.com> Signed-off-by:
Tony Luck <tony.luck@intel.com> Acked-by:
Mauro Carvalho Chehab <mchehab@osg.samsung.com> Cc: Aristeu Rozanski <arozansk@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-edac@vger.kernel.org Fixes: eb1af3b7 ("Fix computation of channel address") Signed-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
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Jan Beulich authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 103f6112 upstream. Huge pages are not normally available to PV guests. Not suppressing hugetlbfs use results in an endless loop of page faults when user mode code tries to access a hugetlbfs mapped area (since the hypervisor denies such PTEs to be created, but error indications can't be propagated out of xen_set_pte_at(), just like for various of its siblings), and - once killed in an oops like this: kernel BUG at .../fs/hugetlbfs/inode.c:428! invalid opcode: 0000 [#1] SMP ... RIP: e030:[<ffffffff811c333b>] [<ffffffff811c333b>] remove_inode_hugepages+0x25b/0x320 ... Call Trace: [<ffffffff811c3415>] hugetlbfs_evict_inode+0x15/0x40 [<ffffffff81167b3d>] evict+0xbd/0x1b0 [<ffffffff8116514a>] __dentry_kill+0x19a/0x1f0 [<ffffffff81165b0e>] dput+0x1fe/0x220 [<ffffffff81150535>] __fput+0x155/0x200 [<ffffffff81079fc0>] task_work_run+0x60/0xa0 [<ffffffff81063510>] do_exit+0x160/0x400 [<ffffffff810637eb>] do_group_exit+0x3b/0xa0 [<ffffffff8106e8bd>] get_signal+0x1ed/0x470 [<ffffffff8100f854>] do_signal+0x14/0x110 [<ffffffff810030e9>] prepare_exit_to_usermode+0xe9/0xf0 [<ffffffff814178a5>] retint_user+0x8/0x13 This is CVE-2016-3961 / XSA-174. Reported-by:
Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by:
Jan Beulich <jbeulich@suse.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Juergen Gross <JGross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Luis R. Rodriguez <mcgrof@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Toshi Kani <toshi.kani@hp.com> Cc: xen-devel <xen-devel@lists.xenproject.org> Link: http://lkml.kernel.org/r/57188ED802000078000E431C@prv-mh.provo.novell.comSigned-off-by:
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Peter Zijlstra authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 2f5177f0 upstream. The CPU controller hasn't kept up with the various changes in the whole cgroup initialization / destruction sequence, and commit: 2e91fa7f ("cgroup: keep zombies associated with their original cgroups") caused it to explode. The reason for this is that zombies do not inhibit css_offline() from being called, but do stall css_released(). Now we tear down the cfs_rq structures on css_offline() but zombies can run after that, leading to use-after-free issues. The solution is to move the tear-down to css_released(), which guarantees nobody (including no zombies) is still using our cgroup. Furthermore, a few simple cleanups are possible too. There doesn't appear to be any point to us using css_online() (anymore?) so fold that in css_alloc(). And since cgroup code guarantees an RCU grace period between css_released() and css_free() we can forgo using call_rcu() and free the stuff immediately. Suggested-by:
Tejun Heo <tj@kernel.org> Reported-by:
Kazuki Yamaguchi <k@rhe.jp> Reported-by:
Niklas Cassel <niklas.cassel@axis.com> Tested-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by:
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Robert Jarzmik authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 6bab1c6a upstream. The current number of requestor lines is limited to 31. This was an error of a previous commit, as this number is platform dependent, and is actually : - for pxa25x: 40 requestor lines - for pxa27x: 75 requestor lines - for pxa3xx: 100 requestor lines The previous testing did not reveal the faulty constant as on pxa[23]xx platforms, only camera, MSL and USB are above requestor 32, and in these only the camera has a driver using dma. Fixes: e87ffbdf ("dmaengine: pxa_dma: fix the no-requestor case") Signed-off-by:
Robert Jarzmik <robert.jarzmik@free.fr> Acked-by:
Vinod Koul <vinod.koul@intel.com> Signed-off-by:
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Andy Shevchenko authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 4f4bc0ab upstream. There is a typo in documentation regarding to descriptor empty bit (DESCE) which is set to 1 when descriptor is empty. Thus, status register at the end of a transfer usually returns all DESCE bits set and thus it will never be zero. Moreover, there are 2 bits (CDESC) that encode current descriptor, on which interrupt has been asserted. In case when we have few descriptors programmed we might have non-zero value. Remove DESCE and CDESC bits from DMA channel status register (HSU_CH_SR) when reading it. Fixes: 2b49e0c5 ("dmaengine: append hsu DMA driver") Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by:
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Andy Shevchenko authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 3fe6409c upstream. The commit 89500520 ("dmaengine: dw: apply both HS interfaces and remove slave_id usage") cleaned up the code to avoid usage of depricated slave_id member of generic slave configuration. Meanwhile it broke the master selection by removing important call to dwc_set_masters() in ->device_alloc_chan_resources() which copied masters from custom slave configuration to the internal channel structure. Everything works until now since there is no customized connection of DesignWare DMA IP to the bus, i.e. one bus and one or more masters are in use. The configurations where 2 masters are connected to the different masters are not working anymore. We are expecting one user of such configuration and need to select masters properly. Besides that it is obviously a performance regression since only one master is in use in multi-master configuration. Select masters in accordance with what user asked for. Keep this patch in a form more suitable for back porting. We are safe to take necessary data in ->device_alloc_chan_resources() because we don't support generic slave configuration embedded into custom one, and thus the only way to provide such is to use the parameter to a filter function which is called exactly before channel resource allocation. While here, replase BUG_ON to less noisy dev_warn() and prevent channel allocation in case of error. Fixes: 89500520 ("dmaengine: dw: apply both HS interfaces and remove slave_id usage") Signed-off-by:
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Seth Forshee authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 87243deb upstream. Starting with 4.1 the tracing subsystem has its own filesystem which is automounted in the tracing subdirectory of debugfs. Prior to this debugfs could be bind mounted in a cloned mount namespace, but if tracefs has been mounted under debugfs this now fails because there is a locked child mount. This creates a regression for container software which bind mounts debugfs to satisfy the assumption of some userspace software. In other pseudo filesystems such as proc and sysfs we're already creating mountpoints like this in such a way that no dirents can be created in the directories, allowing them to be exceptions to some MNT_LOCKED tests. In fact we're already do this for the tracefs mountpoint in sysfs. Do the same in debugfs_create_automount(), since the intention here is clearly to create a mountpoint. This fixes the regression, as locked child mounts on permanently empty directories do not cause a bind mount to fail. Signed-off-by:
Seth Forshee <seth.forshee@canonical.com> Acked-by:
Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by:
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Rui Salvaterra authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 3e26a691 upstream. Based on Sergey's test patch [1], this fixes zram with lz4 compression on big endian cpus. Note that the 64-bit preprocessor test is not a cleanup, it's part of the fix, since those identifiers are bogus (for example, __ppc64__ isn't defined anywhere else in the kernel, which means we'd fall into the 32-bit definitions on ppc64). Tested on ppc64 with no regression on x86_64. [1] http://marc.info/?l=linux-kernel&m=145994470805853&w=4Suggested-by:
Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by:
Rui Salvaterra <rsalvaterra@gmail.com> Reviewed-by:
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Ahmed Samy authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 6545b60b upstream. Commit 9567366f ("dm cache metadata: fix READ_LOCK macros and cleanup WRITE_LOCK macros") uses down_write() instead of down_read() in cmd_read_lock(), yet up_read() is used to release the lock in READ_UNLOCK(). Fix it. Fixes: 9567366f ("dm cache metadata: fix READ_LOCK macros and cleanup WRITE_LOCK macros") Signed-off-by:
Ahmed Samy <f.fallen45@gmail.com> Signed-off-by:
Mike Snitzer <snitzer@redhat.com> Signed-off-by:
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Mike Snitzer authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 9567366f upstream. The READ_LOCK macro was incorrectly returning -EINVAL if dm_bm_is_read_only() was true -- it will always be true once the cache metadata transitions to read-only by dm_cache_metadata_set_read_only(). Wrap READ_LOCK and WRITE_LOCK multi-statement macros in do {} while(0). Also, all accesses of the 'cmd' argument passed to these related macros are now encapsulated in parenthesis. A follow-up patch can be developed to eliminate the use of macros in favor of pure C code. Avoiding that now given that this needs to apply to stable@. Reported-by:
Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
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Lars-Peter Clausen authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 38740a5b upstream. When using asynchronous read or write operations on the USB endpoints the issuer of the IO request is notified by calling the ki_complete() callback of the submitted kiocb when the URB has been completed. Calling this ki_complete() callback will free kiocb. Make sure that the structure is no longer accessed beyond that point, otherwise undefined behaviour might occur. Fixes: 2e4c7553 ("usb: gadget: f_fs: add aio support") Signed-off-by:
Lars-Peter Clausen <lars@metafoo.de> Signed-off-by:
Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by:
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Robert Dobrowolski authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit e86103a7 upstream. On BXT platform Host Controller and Device Controller figure as same PCI device but with different device function. HCD should not pass data to Device Controller but only to Host Controllers. Checking if companion device is Host Controller, otherwise skip. Signed-off-by:
Robert Dobrowolski <robert.dobrowolski@linux.intel.com> Acked-by:
Alan Stern <stern@rowland.harvard.edu> Signed-off-by:
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Mathias Nyman authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 98d74f9c upstream. PCI hotpluggable xhci controllers such as some Alpine Ridge solutions will remove the xhci controller from the PCI bus when the last USB device is disconnected. Add a flag to indicate that the host is being removed to avoid queueing configure_endpoint commands for the dropped endpoints. For PCI hotplugged controllers this will prevent 5 second command timeouts For static xhci controllers the configure_endpoint command is not needed in the removal case as everything will be returned, freed, and the controller is reset. For now the flag is only set for PCI connected host controllers. Signed-off-by:
Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by:
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Lu Baolu authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 71504062 upstream. This patch fixes some wild pointers produced by xhci_mem_cleanup. These wild pointers will cause system crash if xhci_mem_cleanup() is called twice. Reported-and-tested-by:
Pengcheng Li <lpc.li@hisilicon.com> Signed-off-by:
Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by:
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Mathias Nyman authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 671ffdff upstream. Give USB3 devices a better chance to enumerate at USB 3 speeds if they are connected to a suspended host. Solves an issue with NEC uPD720200 host hanging when partially enumerating a USB3 device as USB2 after host controller runtime resume. Tested-by:
Mike Murdoch <main.haarp@gmail.com> Signed-off-by:
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Rafal Redzimski authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 0d46faca upstream. Broxton B0 also requires XHCI_PME_STUCK_QUIRK. Adding PCI device ID for Broxton B and adding to quirk. Signed-off-by:
Rafal Redzimski <rafal.f.redzimski@intel.com> Signed-off-by:
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Jerome Marchand authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 8d4a2ec1 upstream. Changes since V1: fixed the description and added KASan warning. In assoc_array_insert_into_terminal_node(), we call the compare_object() method on all non-empty slots, even when they're not leaves, passing a pointer to an unexpected structure to compare_object(). Currently it causes an out-of-bound read access in keyring_compare_object detected by KASan (see below). The issue is easily reproduced with keyutils testsuite. Only call compare_object() when the slot is a leave. KASan warning: ================================================================== BUG: KASAN: slab-out-of-bounds in keyring_compare_object+0x213/0x240 at addr ffff880060a6f838 Read of size 8 by task keyctl/1655 ============================================================================= BUG kmalloc-192 (Not tainted): kasan: bad access detected ----------------------------------------------------------------------------- Disabling lock debugging due to kernel taint INFO: Allocated in assoc_array_insert+0xfd0/0x3a60 age=69 cpu=1 pid=1647 ___slab_alloc+0x563/0x5c0 __slab_alloc+0x51/0x90 kmem_cache_alloc_trace+0x263/0x300 assoc_array_insert+0xfd0/0x3a60 __key_link_begin+0xfc/0x270 key_create_or_update+0x459/0xaf0 SyS_add_key+0x1ba/0x350 entry_SYSCALL_64_fastpath+0x12/0x76 INFO: Slab 0xffffea0001829b80 objects=16 used=8 fp=0xffff880060a6f550 flags=0x3fff8000004080 INFO: Object 0xffff880060a6f740 @offset=5952 fp=0xffff880060a6e5d1 Bytes b4 ffff880060a6f730: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object ffff880060a6f740: d1 e5 a6 60 00 88 ff ff 0e 00 00 00 00 00 00 00 ...`............ Object ffff880060a6f750: 02 cf 8e 60 00 88 ff ff 02 c0 8e 60 00 88 ff ff ...`.......`.... Object ffff880060a6f760: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object ffff880060a6f770: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object ffff880060a6f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object ffff880060a6f790: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object ffff880060a6f7a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object ffff880060a6f7b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object ffff880060a6f7c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object ffff880060a6f7d0: 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object ffff880060a6f7e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object ffff880060a6f7f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ CPU: 0 PID: 1655 Comm: keyctl Tainted: G B 4.5.0-rc4-kasan+ #291 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 0000000000000000 000000001b2800b4 ffff880060a179e0 ffffffff81b60491 ffff88006c802900 ffff880060a6f740 ffff880060a17a10 ffffffff815e2969 ffff88006c802900 ffffea0001829b80 ffff880060a6f740 ffff880060a6e650 Call Trace: [<ffffffff81b60491>] dump_stack+0x85/0xc4 [<ffffffff815e2969>] print_trailer+0xf9/0x150 [<ffffffff815e9454>] object_err+0x34/0x40 [<ffffffff815ebe50>] kasan_report_error+0x230/0x550 [<ffffffff819949be>] ? keyring_get_key_chunk+0x13e/0x210 [<ffffffff815ec62d>] __asan_report_load_n_noabort+0x5d/0x70 [<ffffffff81994cc3>] ? keyring_compare_object+0x213/0x240 [<ffffffff81994cc3>] keyring_compare_object+0x213/0x240 [<ffffffff81bc238c>] assoc_array_insert+0x86c/0x3a60 [<ffffffff81bc1b20>] ? assoc_array_cancel_edit+0x70/0x70 [<ffffffff8199797d>] ? __key_link_begin+0x20d/0x270 [<ffffffff8199786c>] __key_link_begin+0xfc/0x270 [<ffffffff81993389>] key_create_or_update+0x459/0xaf0 [<ffffffff8128ce0d>] ? trace_hardirqs_on+0xd/0x10 [<ffffffff81992f30>] ? key_type_lookup+0xc0/0xc0 [<ffffffff8199e19d>] ? lookup_user_key+0x13d/0xcd0 [<ffffffff81534763>] ? memdup_user+0x53/0x80 [<ffffffff819983ea>] SyS_add_key+0x1ba/0x350 [<ffffffff81998230>] ? key_get_type_from_user.constprop.6+0xa0/0xa0 [<ffffffff828bcf4e>] ? retint_user+0x18/0x23 [<ffffffff8128cc7e>] ? trace_hardirqs_on_caller+0x3fe/0x580 [<ffffffff81004017>] ? trace_hardirqs_on_thunk+0x17/0x19 [<ffffffff828bc432>] entry_SYSCALL_64_fastpath+0x12/0x76 Memory state around the buggy address: ffff880060a6f700: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff880060a6f780: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc >ffff880060a6f800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff880060a6f880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff880060a6f900: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 ================================================================== Signed-off-by:
Jerome Marchand <jmarchan@redhat.com> Signed-off-by:
David Howells <dhowells@redhat.com> Signed-off-by:
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Lokesh Vutla authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 3ca4a238 upstream. Commit 127500cc ("ARM: OMAP2+: Only write the sysconfig on idle when necessary") talks about verification of sysconfig cache value before updating it, only during idle path. But the patch is adding the verification in the enable path. So, adding the check in a proper place as per the commit description. Not keeping this check during enable path as there is a chance of losing context and it is safe to do on idle as the context of the register will never be lost while the device is active. Signed-off-by:
Lokesh Vutla <lokeshvutla@ti.com> Acked-by:
Tero Kristo <t-kristo@ti.com> Cc: Jon Hunter <jonathanh@nvidia.com> Fixes: commit 127500cc "ARM: OMAP2+: Only write the sysconfig on idle when necessary" [paul@pwsan.com: appears to have been caused by my own mismerge of the originally posted patch] Signed-off-by:
Paul Walmsley <paul@pwsan.com> Signed-off-by:
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Nishanth Menon authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 456e8d53 upstream. The following commits: commit 3fa60975 ("ARM: omap2: restore OMAP4 barrier behaviour") commit f746929f ("Revert "ARM: OMAP4: remove dead kconfig option OMAP4_ERRATA_I688"") and commit ea827ad5 ("ARM: DRA7: Provide proper IO map table") came in around the same time, unfortunately this seem to have missed initializing the barrier for DRA7 platforms - omap5_map_io was reused for dra7 till it was split out by the last patch. barrier_init needs to be hence carried forward as it is valid for DRA7 family of processors as they are for OMAP5. Fixes: ea827ad5 ("ARM: DRA7: Provide proper IO map table") Reported-by:
Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reported-by:
Tomi Valkeinen <tomi.valkeinen@ti.com> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by:
Nishanth Menon <nm@ti.com> Reviewed-by:
Tony Lindgren <tony@atomide.com> Signed-off-by:
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Patrick Uiterwijk authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit 199831c7 upstream. The USB2 port for Armada 38x is defined to be at 58000, not at 50000. Fixes: 2d0a7add ("ARM: Kirkwood: Add support for many Synology NAS devices") Signed-off-by:
Patrick Uiterwijk <patrick@puiterwijk.org> Acked-by:
Imre Kaloz <kaloz@openwrt.org> Signed-off-by:
Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by:
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Lokesh Vutla authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit cfe1580a upstream. commit 55ee7017 ("arm: omap2: board-generic: use omap4_local_timer_init for AM437x") makes synctimer32k as the clocksource on AM43xx. By default the synctimer32k is clocked by 32K RTC OSC on AM43xx. But this 32K RTC OSC is not available on epos boards which makes it fail to boot. Synctimer32k can also be clocked by a peripheral PLL, so making this as clock parent for synctimer3k on epos boards. Fixes: 55ee7017 ("arm: omap2: board-generic: use omap4_local_timer_init for AM437x") Reported-by:
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David Matlack authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit fc5b7f3b upstream. An interrupt handler that uses the fpu can kill a KVM VM, if it runs under the following conditions: - the guest's xcr0 register is loaded on the cpu - the guest's fpu context is not loaded - the host is using eagerfpu Note that the guest's xcr0 register and fpu context are not loaded as part of the atomic world switch into "guest mode". They are loaded by KVM while the cpu is still in "host mode". Usage of the fpu in interrupt context is gated by irq_fpu_usable(). The interrupt handler will look something like this: if (irq_fpu_usable()) { kernel_fpu_begin(); [... code that uses the fpu ...] kernel_fpu_end(); } As long as the guest's fpu is not loaded and the host is using eager fpu, irq_fpu_usable() returns true (interrupted_kernel_fpu_idle() returns true). The interrupt handler proceeds to use the fpu with the guest's xcr0 live. kernel_fpu_begin() saves the current fpu context. If this uses XSAVE[OPT], it may leave the xsave area in an undesirable state. According to the SDM, during XSAVE bit i of XSTATE_BV is not modified if bit i is 0 in xcr0. So it's possible that XSTATE_BV[i] == 1 and xcr0[i] == 0 following an XSAVE. kernel_fpu_end() restores the fpu context. Now if any bit i in XSTATE_BV == 1 while xcr0[i] == 0, XRSTOR generates a #GP. The fault is trapped and SIGSEGV is delivered to the current process. Only pre-4.2 kernels appear to be vulnerable to this sequence of events. Commit 653f52c3 ("kvm,x86: load guest FPU context more eagerly") from 4.2 forces the guest's fpu to always be loaded on eagerfpu hosts. This patch fixes the bug by keeping the host's xcr0 loaded outside of the interrupts-disabled region where KVM switches into guest mode. Suggested-by:
Andy Lutomirski <luto@amacapital.net> Signed-off-by:
David Matlack <dmatlack@google.com> [Move load after goto cancel_injection. - Paolo] Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
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Tony Luck authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit a3125494 upstream. When we loop over all queued machine check error records to pass them to the registered notifiers we use llist_for_each_entry(). But the loop calls gen_pool_free() for the entry in the body of the loop - and then the iterator looks at node->next after the free. Use llist_for_each_entry_safe() instead. Signed-off-by:
Borislav Petkov <bp@suse.de> Cc: Gong Chen <gong.chen@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-edac <linux-edac@vger.kernel.org> Link: http://lkml.kernel.org/r/0205920@agluck-desk.sc.intel.com Link: http://lkml.kernel.org/r/1459929916-12852-4-git-send-email-bp@alien8.deSigned-off-by:
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Ming Lei authored
BugLink: http://bugs.launchpad.net/bugs/1578798 commit a7297a6a upstream. Starting from commit e36f6204(block: split bios to max possible length), block core starts to split bio in the middle of bvec. Unfortunately loop dio/aio doesn't consider this situation, and always treat 'iter.iov_offset' as zero. Then filesystem corruption is observed. This patch figures out the offset of the base bvevc via 'bio->bi_iter.bi_bvec_done' and fixes the issue by passing the offset to iov iterator. Fixes: e36f6204 (block: split bios to max possible length) Cc: Keith Busch <keith.busch@intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
Ming Lei <ming.lei@canonical.com> Signed-off-by:
Jens Axboe <axboe@fb.com> Signed-off-by:
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Tom St Denis authored
BugLink: http://bugs.launchpad.net/bugs/1578305Signed-off-by:
Tom St Denis <tom.stdenis@amd.com> Reviewed-by:
Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 9c97e75f) Signed-off-by:
Tim Gardner <tim.gardner@canonical.com> Acked-by:
Christopher Arges <chris.j.arges@canonical.com> Signed-off-by:
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Ben Hutchings authored
atl2 includes NETIF_F_SG in hw_features even though it has no support for non-linear skbs. This bug was originally harmless since the driver does not claim to implement checksum offload and that used to be a requirement for SG. Now that SG and checksum offload are independent features, if you explicitly enable SG *and* use one of the rare protocols that can use SG without checkusm offload, this potentially leaks sensitive information (before you notice that it just isn't working). Therefore this obscure bug has been designated CVE-2016-2117. Reported-by:
Justin Yackoski <jyackoski@crypto-nite.com> Signed-off-by:
David S. Miller <davem@davemloft.net> (cherry picked from commit f43bfaed) CVE-2016-2117 BugLink: https://bugs.launchpad.net/bugs/1561403Signed-off-by:
Luis Henriques <luis.henriques@canonical.com> Acked-by:
Brad Figg <brad.figg@canonical.com> Acked-by:
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Vladis Dronov authored
The gtco driver expects at least one valid endpoint. If given malicious descriptors that specify 0 for the number of endpoints, it will crash in the probe function. Ensure there is at least one endpoint on the interface before using it. Also let's fix a minor coding style issue. The full correct report of this issue can be found in the public Red Hat Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1283385Reported-by:
Ralf Spenneberg <ralf@spenneberg.net> Signed-off-by:
Vladis Dronov <vdronov@redhat.com> Cc: stable@vger.kernel.org Signed-off-by:
Dmitry Torokhov <dmitry.torokhov@gmail.com> (cherry picked from commit 162f98de) CVE-2016-2187 BugLink: https://bugs.launchpad.net/bugs/1575706Signed-off-by:
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Ned Bass authored
BugLink: http://bugs.launchpad.net/bugs/1574801 Commit 4967a3e introduced a typo that caused the ZPL to store the intended default ACL as an access ACL. Due to caching this problem may not become visible until the filesystem is remounted or the inode is evicted from the cache. Fix the typo and add a regression test. Signed-off-by:
Ned Bass <bass6@llnl.gov> Signed-off-by:
Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by:
Chunwei Chen <tuxoko@gmail.com> Closes #4520 (backport from 98f03691a4c08f38ca4538c468e9523f8e6b24be https://github.com/zfsonlinux/zfs.git) (dropped redundant modifications to zfs tests, we don't have these) Signed-off-by:
Colin Ian King <colin.king@canonical.com> Acked-by:
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Daniel Jurgens authored
BugLink: http://bugs.launchpad.net/bugs/1574697 Maintain the PCI status and provide wrappers for enabling and disabling the PCI device. Performing the actions more than once without doing its opposite results in warning logs. This occurred when EEH hotplugged the device causing a warning for disabling an already disabled device. Fixes: 2ba5fbd6 ('net/mlx4_core: Handle AER flow properly') Signed-off-by:
Daniel Jurgens <danielj@mellanox.com> Signed-off-by:
Yishai Hadas <yishaih@mellanox.com> Signed-off-by:
Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by:
Stefan Bader <stefan.bader@canonical.com> Signed-off-by:
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Daniel Jurgens authored
BugLink: http://bugs.launchpad.net/bugs/1574697 Move resume related activities to a new pci_resume function instead of performing them in mlx4_pci_slot_reset. This change is needed to avoid a hotplug during EEH recovery due to commit f2da4ccf ("powerpc/eeh: More relaxed hotplug criterion"). Fixes: 2ba5fbd6 ('net/mlx4_core: Handle AER flow properly') Signed-off-by:
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Pali Rohár authored
BugLink: http://bugs.launchpad.net/bugs/1574498 This patch adds support for controlling keyboard backlight via standard linux led class interface (::kbd_backlight). It uses ACPI HKEY device with MLCG and MLCS methods. Signed-off-by:
Pali Rohár <pali.rohar@gmail.com> Tested-by:
Fabio D'Urso <fabiodurso@hotmail.it> Acked-by:
Henrique de Moraes Holschuh <hmh@hmh.eng.br> Signed-off-by:
Darren Hart <dvhart@linux.intel.com> (cherry picked from commit bb28f3d5) Signed-off-by:
Andy Whitcroft <apw@canonical.com> Signed-off-by:
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Tim Gardner authored
BugLink: http://bugs.launchpad.net/bugs/1499089Signed-off-by:
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Kamal Mostafa authored
Ignore: yes Signed-off-by:
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- 12 May, 2016 4 commits
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Kamal Mostafa authored
Signed-off-by: -
Radim Krčmář authored
MSR 0x2f8 accessed the 124th Variable Range MTRR ever since MTRR support was introduced by 9ba075a6 ("KVM: MTRR support"). 0x2f8 became harmful when 910a6aae ("KVM: MTRR: exactly define the size of variable MTRRs") shrinked the array of VR MTRRs from 256 to 8, which made access to index 124 out of bounds. The surrounding code only WARNs in this situation, thus the guest gained a limited read/write access to struct kvm_arch_vcpu. 0x2f8 is not a valid VR MTRR MSR, because KVM has/advertises only 16 VR MTRR MSRs, 0x200-0x20f. Every VR MTRR is set up using two MSRs, 0x2f8 was treated as a PHYSBASE and 0x2f9 would be its PHYSMASK, but 0x2f9 was not implemented in KVM, therefore 0x2f8 could never do anything useful and getting rid of it is safe. This fixes CVE-2016-3713. Fixes: 910a6aae ("KVM: MTRR: exactly define the size of variable MTRRs") Cc: stable@vger.kernel.org Reported-by:
Radim Krèmáø <rkrcmar@redhat.com> BugLink: http://bugs.launchpad.net/bugs/1581201Acked-by:
Tyler Hicks <tyhicks@canonical.com> Acked-by:
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David Howells authored
This fixes CVE-2016-0758. In the ASN.1 decoder, when the length field of an ASN.1 value is extracted, it isn't validated against the remaining amount of data before being added to the cursor. With a sufficiently large size indicated, the check: datalen - dp < 2 may then fail due to integer overflow. Fix this by checking the length indicated against the amount of remaining data in both places a definite length is determined. Whilst we're at it, make the following changes: (1) Check the maximum size of extended length does not exceed the capacity of the variable it's being stored in (len) rather than the type that variable is assumed to be (size_t). (2) Compare the EOC tag to the symbolic constant ASN1_EOC rather than the integer 0. (3) To reduce confusion, move the initialisation of len outside of: for (len = 0; n > 0; n--) { since it doesn't have anything to do with the loop counter n. Signed-off-by:Mimi Zohar <zohar@linux.vnet.ibm.com> Acked-by:
David Woodhouse <David.Woodhouse@intel.com> Acked-by:
Peter Jones <pjones@redhat.com> Reference: https://lkml.org/lkml/2016/5/12/270 BugLink: http://bugs.launchpad.net/bugs/1581202Acked-by:
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Kamal Mostafa authored
Ignore: yes Signed-off-by:
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- 05 May, 2016 2 commits
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Kamal Mostafa authored
Signed-off-by: -
Jann Horn authored
BugLink: http://bugs.launchpad.net/bugs/1578705 When bpf(BPF_PROG_LOAD, ...) was invoked with a BPF program whose bytecode references a non-map file descriptor as a map file descriptor, the error handling code called fdput() twice instead of once (in __bpf_map_get() and in replace_map_fd_with_map_ptr()). If the file descriptor table of the current task is shared, this causes f_count to be decremented too much, allowing the struct file to be freed while it is still in use (use-after-free). This can be exploited to gain root privileges by an unprivileged user. This bug was introduced in commit 0246e64d ("bpf: handle pseudo BPF_LD_IMM64 insn"), but is only exploitable since commit 1be7f75d ("bpf: enable non-root eBPF programs") because previously, CAP_SYS_ADMIN was required to reach the vulnerable code. (posted publicly according to request by maintainer) Signed-off-by:
Jann Horn <jannh@google.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Acked-by:
Alexei Starovoitov <ast@kernel.org> Acked-by:
Daniel Borkmann <daniel@iogearbox.net> Signed-off-by:
Steve Beattie <steve.beattie@canonical.com> Signed-off-by:
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