- 09 Mar, 2016 12 commits
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Takashi Iwai authored
commit 6236d8bb upstream. The X32 ABI takes the same alignment like x86-64, and this may result in the incompatible struct size from ia32. Unfortunately, we hit this in some control ABI: struct snd_ctl_elem_value differs between them due to the position of 64bit variable array. This ends up with the unknown ioctl (ENOTTY) error. The fix is to add the compat entries for the new aligned struct. Reported-and-tested-by:
Steven Newbury <steve@snewbury.org.uk> Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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David Woodhouse authored
commit be629c62 upstream. When a directory is deleted, we don't take too much care about killing off all the dirents that belong to it — on the basis that on remount, the scan will conclude that the directory is dead anyway. This doesn't work though, when the deleted directory contained a child directory which was moved *out*. In the early stages of the fs build we can then end up with an apparent hard link, with the child directory appearing both in its true location, and as a child of the original directory which are this stage of the mount process we don't *yet* know is defunct. To resolve this, take out the early special-casing of the "directories shall not have hard links" rule in jffs2_build_inode_pass1(), and let the normal nlink processing happen for directories as well as other inodes. Then later in the build process we can set ic->pino_nlink to the parent inode#, as is required for directories during normal operaton, instead of the nlink. And complain only *then* about hard links which are still in evidence even after killing off all the unreachable paths. Reported-by:
Liu Song <liu.song11@zte.com.cn> Signed-off-by:
David Woodhouse <David.Woodhouse@intel.com> Signed-off-by:
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David Woodhouse authored
commit 49e91e70 upstream. With this fix, all code paths should now be obtaining the page lock before f->sem. Reported-by:
Szabó Tamás <sztomi89@gmail.com> Tested-by:
Thomas Betker <thomas.betker@rohde-schwarz.com> Signed-off-by:
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Thomas Betker authored
commit 157078f6 upstream. This reverts commit 5ffd3412 ("jffs2: Fix lock acquisition order bug in jffs2_write_begin"). The commit modified jffs2_write_begin() to remove a deadlock with jffs2_garbage_collect_live(), but this introduced new deadlocks found by multiple users. page_lock() actually has to be called before mutex_lock(&c->alloc_sem) or mutex_lock(&f->sem) because jffs2_write_end() and jffs2_readpage() are called with the page locked, and they acquire c->alloc_sem and f->sem, resp. In other words, the lock order in jffs2_write_begin() was correct, and it is the jffs2_garbage_collect_live() path that has to be changed. Revert the commit to get rid of the new deadlocks, and to clear the way for a better fix of the original deadlock. Reported-by:
Deng Chao <deng.chao1@zte.com.cn> Reported-by:
Ming Liu <liu.ming50@gmail.com> Reported-by:
wangzaiwei <wangzaiwei@top-vision.cn> Signed-off-by:
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Todd E Brandt authored
commit 92f9e179 upstream. Pause/unpause graph tracing around do_suspend_lowlevel as it has inconsistent call/return info after it jumps to the wakeup vector. The graph trace buffer will otherwise become misaligned and may eventually crash and hang on suspend. To reproduce the issue and test the fix: Run a function_graph trace over suspend/resume and set the graph function to suspend_devices_and_enter. This consistently hangs the system without this fix. Signed-off-by:
Todd Brandt <todd.e.brandt@linux.intel.com> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
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Harvey Hunt authored
commit 4ee34ea3 upstream. The id buffer in ata_device is a DMA target, but it isn't explicitly cacheline aligned. Due to this, adjacent fields can be overwritten with stale data from memory on non coherent architectures. As a result, the kernel is sometimes unable to communicate with an ATA device. Fix this by ensuring that the id buffer is cacheline aligned. This issue is similar to that fixed by Commit 84bda12a ("libata: align ap->sector_buf"). Signed-off-by:
Harvey Hunt <harvey.hunt@imgtec.com> Cc: linux-kernel@vger.kernel.org Signed-off-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
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Arnd Bergmann authored
commit 287e6611 upstream. As reported by Soohoon Lee, the HDIO_GET_32BIT ioctl does not work correctly in compat mode with libata. I have investigated the issue further and found multiple problems that all appeared with the same commit that originally introduced HDIO_GET_32BIT handling in libata back in linux-2.6.8 and presumably also linux-2.4, as the code uses "copy_to_user(arg, &val, 1)" to copy a 'long' variable containing either 0 or 1 to user space. The problems with this are: * On big-endian machines, this will always write a zero because it stores the wrong byte into user space. * In compat mode, the upper three bytes of the variable are updated by the compat_hdio_ioctl() function, but they now contain uninitialized stack data. * The hdparm tool calling this ioctl uses a 'static long' variable to store the result. This means at least the upper bytes are initialized to zero, but calling another ioctl like HDIO_GET_MULTCOUNT would fill them with data that remains stale when the low byte is overwritten. Fortunately libata doesn't implement any of the affected ioctl commands, so this would only happen when we query both an IDE and an ATA device in the same command such as "hdparm -N -c /dev/hda /dev/sda" * The libata code for unknown reasons started using ATA_IOC_GET_IO32 and ATA_IOC_SET_IO32 as aliases for HDIO_GET_32BIT and HDIO_SET_32BIT, while the ioctl commands that were added later use the normal HDIO_* names. This is harmless but rather confusing. This addresses all four issues by changing the code to use put_user() on an 'unsigned long' variable in HDIO_GET_32BIT, like the IDE subsystem does, and by clarifying the names of the ioctl commands. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Reported-by:
Soohoon Lee <Soohoon.Lee@f5.com> Tested-by:
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Timothy Pearson authored
commit 2d02b8bd upstream. During DRAM initialization on certain ASpeed devices, an incorrect bit (bit 10) was checked in the "SDRAM Bus Width Status" register to determine DRAM width. Query bit 6 instead in accordance with the Aspeed AST2050 datasheet v1.05. Signed-off-by:
Timothy Pearson <tpearson@raptorengineeringinc.com> Signed-off-by:
Dave Airlie <airlied@redhat.com> Signed-off-by:
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Andy Lutomirski authored
commit 3d44d51b upstream. This doesn't seem to fix a regression -- I don't think the CLAC was ever there. I double-checked in a debugger: entries through the int80 gate do not automatically clear AC. Stable maintainers: I can provide a backport to 4.3 and earlier if needed. This needs to be backported all the way to 3.10. Reported-by:
Brian Gerst <brgerst@gmail.com> Signed-off-by:
Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 63bcff2a ("x86, smap: Add STAC and CLAC instructions to control user space access") Link: http://lkml.kernel.org/r/b02b7e71ae54074be01fc171cbd4b72517055c0e.1456345086.git.luto@kernel.orgSigned-off-by:
Ingo Molnar <mingo@kernel.org> [ kamal: backport to 3.10 through 3.19-stable: file rename; context ] Signed-off-by:
Kamal Mostafa <kamal@canonical.com> Signed-off-by:
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Pavel Shilovsky authored
commit 6cc3b242 upstream. For interim responses we only need to parse a header and update a number credits. Now it is done for all SMB2+ command except SMB2_READ which is wrong. Fix this by adding such processing. Signed-off-by:
Pavel Shilovsky <pshilovsky@samba.org> Tested-by:
Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by:
Steve French <smfrench@gmail.com> Signed-off-by:
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Borislav Petkov authored
commit 12e26969 upstream. I get the splat below when modprobing/rmmoding EDAC drivers. It happens because bus->name is invalid after bus_unregister() has run. The Code: section below corresponds to: .loc 1 1108 0 movq 672(%rbx), %rax # mci_1(D)->bus, mci_1(D)->bus .loc 1 1109 0 popq %rbx # .loc 1 1108 0 movq (%rax), %rdi # _7->name, jmp kfree # and %rax has some funky stuff 2030203020312030 which looks a lot like something walked over it. Fix that by saving the name ptr before doing stuff to string it points to. general protection fault: 0000 [#1] SMP Modules linked in: ... CPU: 4 PID: 10318 Comm: modprobe Tainted: G I EN 3.12.51-11-default+ #48 Hardware name: HP ProLiant DL380 G7, BIOS P67 05/05/2011 task: ffff880311320280 ti: ffff88030da3e000 task.ti: ffff88030da3e000 RIP: 0010:[<ffffffffa019da92>] [<ffffffffa019da92>] edac_unregister_sysfs+0x22/0x30 [edac_core] RSP: 0018:ffff88030da3fe28 EFLAGS: 00010292 RAX: 2030203020312030 RBX: ffff880311b4e000 RCX: 000000000000095c RDX: 0000000000000001 RSI: ffff880327bb9600 RDI: 0000000000000286 RBP: ffff880311b4e750 R08: 0000000000000000 R09: ffffffff81296110 R10: 0000000000000400 R11: 0000000000000000 R12: ffff88030ba1ac68 R13: 0000000000000001 R14: 00000000011b02f0 R15: 0000000000000000 FS: 00007fc9bf8f5700(0000) GS:ffff8801a7c40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000403c90 CR3: 000000019ebdf000 CR4: 00000000000007e0 Stack: Call Trace: i7core_unregister_mci.isra.9 i7core_remove pci_device_remove __device_release_driver driver_detach bus_remove_driver pci_unregister_driver i7core_exit SyS_delete_module system_call_fastpath 0x7fc9bf426536 Code: 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 53 48 89 fb e8 52 2a 1f e1 48 8b bb a0 02 00 00 e8 46 59 1f e1 48 8b 83 a0 02 00 00 5b <48> 8b 38 e9 26 9a fe e0 66 0f 1f 44 00 00 66 66 66 66 90 48 8b RIP [<ffffffffa019da92>] edac_unregister_sysfs+0x22/0x30 [edac_core] RSP <ffff88030da3fe28> Signed-off-by:
Borislav Petkov <bp@suse.de> Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Fixes: 7a623c03 ("edac: rewrite the sysfs code to use struct device") Signed-off-by:
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Jeff Layton authored
commit 7f3697e2 upstream. Dmitry reported that he was able to reproduce the WARN_ON_ONCE that fires in locks_free_lock_context when the flc_posix list isn't empty. The problem turns out to be that we're basically rebuilding the file_lock from scratch in fcntl_setlk when we discover that the setlk has raced with a close. If the l_whence field is SEEK_CUR or SEEK_END, then we may end up with fl_start and fl_end values that differ from when the lock was initially set, if the file position or length of the file has changed in the interim. Fix this by just reusing the same lock request structure, and simply override fl_type value with F_UNLCK as appropriate. That ensures that we really are unlocking the lock that was initially set. While we're there, make sure that we do pop a WARN_ON_ONCE if the removal ever fails. Also return -EBADF in this event, since that's what we would have returned if the close had happened earlier. Cc: Alexander Viro <viro@zeniv.linux.org.uk> Fixes: c293621b (stale POSIX lock handling) Reported-by:
Dmitry Vyukov <dvyukov@google.com> Signed-off-by:
Jeff Layton <jeff.layton@primarydata.com> Acked-by:
"J. Bruce Fields" <bfields@fieldses.org> Signed-off-by:
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- 03 Mar, 2016 28 commits
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Greg Kroah-Hartman authored
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Konrad Rzeszutek Wilk authored
commit 4d8c8bd6 upstream. Occasionaly PV guests would crash with: pciback 0000:00:00.1: Xen PCI mapped GSI0 to IRQ16 BUG: unable to handle kernel paging request at 0000000d1a8c0be0 .. snip.. <ffffffff8139ce1b>] find_next_bit+0xb/0x10 [<ffffffff81387f22>] cpumask_next_and+0x22/0x40 [<ffffffff813c1ef8>] pci_device_probe+0xb8/0x120 [<ffffffff81529097>] ? driver_sysfs_add+0x77/0xa0 [<ffffffff815293e4>] driver_probe_device+0x1a4/0x2d0 [<ffffffff813c1ddd>] ? pci_match_device+0xdd/0x110 [<ffffffff81529657>] __device_attach_driver+0xa7/0xb0 [<ffffffff815295b0>] ? __driver_attach+0xa0/0xa0 [<ffffffff81527622>] bus_for_each_drv+0x62/0x90 [<ffffffff8152978d>] __device_attach+0xbd/0x110 [<ffffffff815297fb>] device_attach+0xb/0x10 [<ffffffff813b75ac>] pci_bus_add_device+0x3c/0x70 [<ffffffff813b7618>] pci_bus_add_devices+0x38/0x80 [<ffffffff813dc34e>] pcifront_scan_root+0x13e/0x1a0 [<ffffffff817a0692>] pcifront_backend_changed+0x262/0x60b [<ffffffff814644c6>] ? xenbus_gather+0xd6/0x160 [<ffffffff8120900f>] ? put_object+0x2f/0x50 [<ffffffff81465c1d>] xenbus_otherend_changed+0x9d/0xa0 [<ffffffff814678ee>] backend_changed+0xe/0x10 [<ffffffff81463a28>] xenwatch_thread+0xc8/0x190 [<ffffffff810f22f0>] ? woken_wake_function+0x10/0x10 which was the result of two things: When we call pci_scan_root_bus we would pass in 'sd' (sysdata) pointer which was an 'pcifront_sd' structure. However in the pci_device_add it expects that the 'sd' is 'struct sysdata' and sets the dev->node to what is in sd->node (offset 4): set_dev_node(&dev->dev, pcibus_to_node(bus)); __pcibus_to_node(const struct pci_bus *bus) { const struct pci_sysdata *sd = bus->sysdata; return sd->node; } However our structure was pcifront_sd which had nothing at that offset: struct pcifront_sd { int domain; /* 0 4 */ /* XXX 4 bytes hole, try to pack */ struct pcifront_device * pdev; /* 8 8 */ } That is an hole - filled with garbage as we used kmalloc instead of kzalloc (the second problem). This patch fixes the issue by: 1) Use kzalloc to initialize to a well known state. 2) Put 'struct pci_sysdata' at the start of 'pcifront_sd'. That way access to the 'node' will access the right offset. Signed-off-by:
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by:
Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by:
David Vrabel <david.vrabel@citrix.com> Signed-off-by:
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Al Viro authored
commit c80567c8 upstream. ... into returning a positive to path_openat(), which would interpret that as "symlink had been encountered" and proceed to corrupt memory, etc. It can only happen due to a bug in some ->open() instance or in some LSM hook, etc., so we report any such event *and* make sure it doesn't trick us into further unpleasantness. Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Simon Guinot authored
commit 59ceeaaf upstream. In __request_region, if a conflict with a BUSY and MUXED resource is detected, then the caller goes to sleep and waits for the resource to be released. A pointer on the conflicting resource is kept. At wake-up this pointer is used as a parent to retry to request the region. A first problem is that this pointer might well be invalid (if for example the conflicting resource have already been freed). Another problem is that the next call to __request_region() fails to detect a remaining conflict. The previously conflicting resource is passed as a parameter and __request_region() will look for a conflict among the children of this resource and not at the resource itself. It is likely to succeed anyway, even if there is still a conflict. Instead, the parent of the conflicting resource should be passed to __request_region(). As a fix, this patch doesn't update the parent resource pointer in the case we have to wait for a muxed region right after. Reported-and-tested-by:
Vincent Pelletier <plr.vincent@gmail.com> Signed-off-by:
Simon Guinot <simon.guinot@sequanux.org> Tested-by:
Vincent Donnefort <vdonnefort@gmail.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Stefan Hajnoczi authored
commit b7052cd7 upstream. The qword_get() function NUL-terminates its output buffer. If the input string is in hex format \xXXXX... and the same length as the output buffer, there is an off-by-one: int qword_get(char **bpp, char *dest, int bufsize) { ... while (len < bufsize) { ... *dest++ = (h << 4) | l; len++; } ... *dest = '\0'; return len; } This patch ensures the NUL terminator doesn't fall outside the output buffer. Signed-off-by:
Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by:
J. Bruce Fields <bfields@redhat.com> Signed-off-by:
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Steven Rostedt (Red Hat) authored
commit d045437a upstream. The ftrace:function event is only displayed for parsing the function tracer data. It is not used to enable function tracing, and does not include an "enable" file in its event directory. Originally, this event was kept separate from other events because it did not have a ->reg parameter. But perf added a "reg" parameter for its use which caused issues, because it made the event available to functions where it was not compatible for. Commit 9b63776f "tracing: Do not enable function event with enable" added a TRACE_EVENT_FL_IGNORE_ENABLE flag that prevented the function event from being enabled by normal trace events. But this commit missed keeping the function event from being displayed by the "available_events" directory, which is used to show what events can be enabled by set_event. One documented way to enable all events is to: cat available_events > set_event But because the function event is displayed in the available_events, this now causes an INVALID error: cat: write error: Invalid argument Reported-by:
Chunyu Hu <chuhu@redhat.com> Fixes: 9b63776f "tracing: Do not enable function event with enable" Signed-off-by:
Steven Rostedt <rostedt@goodmis.org> Signed-off-by:
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Christian Borntraeger authored
commit d7444794 upstream. In async_pf we try to allocate with NOWAIT to get an element quickly or fail. This code also handle failures gracefully. Lets silence potential page allocation failures under load. qemu-system-s39: page allocation failure: order:0,mode:0x2200000 [...] Call Trace: ([<00000000001146b8>] show_trace+0xf8/0x148) [<000000000011476a>] show_stack+0x62/0xe8 [<00000000004a36b8>] dump_stack+0x70/0x98 [<0000000000272c3a>] warn_alloc_failed+0xd2/0x148 [<000000000027709e>] __alloc_pages_nodemask+0x94e/0xb38 [<00000000002cd36a>] new_slab+0x382/0x400 [<00000000002cf7ac>] ___slab_alloc.constprop.30+0x2dc/0x378 [<00000000002d03d0>] kmem_cache_alloc+0x160/0x1d0 [<0000000000133db4>] kvm_setup_async_pf+0x6c/0x198 [<000000000013dee8>] kvm_arch_vcpu_ioctl_run+0xd48/0xd58 [<000000000012fcaa>] kvm_vcpu_ioctl+0x372/0x690 [<00000000002f66f6>] do_vfs_ioctl+0x3be/0x510 [<00000000002f68ec>] SyS_ioctl+0xa4/0xb8 [<0000000000781c5e>] system_call+0xd6/0x264 [<000003ffa24fa06a>] 0x3ffa24fa06a Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by:
Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
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Christoph Hellwig authored
commit 50ab8ec7 upstream. See http: //www.infradead.org/rpr.html X-Evolution-Source: 1451162204.2173.11@leira.trondhjem.org Content-Transfer-Encoding: 8bit Mime-Version: 1.0 We support OFFSET_MAX just fine, so don't round down below it. Also switch to using min_t to make the helper more readable. Signed-off-by:
Christoph Hellwig <hch@lst.de> Fixes: 433c9237 ("NFS: Clean up nfs_size_to_loff_t()") Signed-off-by:
Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by:
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Sebastian Andrzej Siewior authored
commit 4ae2182b upstream. A Root Port's AER structure (rpc) contains a queue of events. aer_irq() enqueues AER status information and schedules aer_isr() to dequeue and process it. When we remove a device, aer_remove() waits for the queue to be empty, then frees the rpc struct. But aer_isr() references the rpc struct after dequeueing and possibly emptying the queue, which can cause a use-after-free error as in the following scenario with two threads, aer_isr() on the left and a concurrent aer_remove() on the right: Thread A Thread B -------- -------- aer_irq(): rpc->prod_idx++ aer_remove(): wait_event(rpc->prod_idx == rpc->cons_idx) # now blocked until queue becomes empty aer_isr(): # ... rpc->cons_idx++ # unblocked because queue is now empty ... kfree(rpc) mutex_unlock(&rpc->rpc_mutex) To prevent this problem, use flush_work() to wait until the last scheduled instance of aer_isr() has completed before freeing the rpc struct in aer_remove(). I reproduced this use-after-free by flashing a device FPGA and re-enumerating the bus to find the new device. With SLUB debug, this crashes with 0x6b bytes (POISON_FREE, the use-after-free magic number) in GPR25: pcieport 0000:00:00.0: AER: Multiple Corrected error received: id=0000 Unable to handle kernel paging request for data at address 0x27ef9e3e Workqueue: events aer_isr GPR24: dd6aa000 6b6b6b6b 605f8378 605f8360 d99b12c0 604fc674 606b1704 d99b12c0 NIP [602f5328] pci_walk_bus+0xd4/0x104 [bhelgaas: changelog, stable tag] Signed-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
Bjorn Helgaas <bhelgaas@google.com> Signed-off-by:
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Tejun Heo authored
commit 8eee1d3e upstream. The bulk of ATA host state machine is implemented by ata_sff_hsm_move(). The function is called from either the interrupt handler or, if polling, a work item. Unlike from the interrupt path, the polling path calls the function without holding the host lock and ata_sff_hsm_move() selectively grabs the lock. This is completely broken. If an IRQ triggers while polling is in progress, the two can easily race and end up accessing the hardware and updating state machine state at the same time. This can put the state machine in an illegal state and lead to a crash like the following. kernel BUG at drivers/ata/libata-sff.c:1302! invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN Modules linked in: CPU: 1 PID: 10679 Comm: syz-executor Not tainted 4.5.0-rc1+ #300 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88002bd00000 ti: ffff88002e048000 task.ti: ffff88002e048000 RIP: 0010:[<ffffffff83a83409>] [<ffffffff83a83409>] ata_sff_hsm_move+0x619/0x1c60 ... Call Trace: <IRQ> [<ffffffff83a84c31>] __ata_sff_port_intr+0x1e1/0x3a0 drivers/ata/libata-sff.c:1584 [<ffffffff83a85611>] ata_bmdma_port_intr+0x71/0x400 drivers/ata/libata-sff.c:2877 [< inline >] __ata_sff_interrupt drivers/ata/libata-sff.c:1629 [<ffffffff83a85bf3>] ata_bmdma_interrupt+0x253/0x580 drivers/ata/libata-sff.c:2902 [<ffffffff81479f98>] handle_irq_event_percpu+0x108/0x7e0 kernel/irq/handle.c:157 [<ffffffff8147a717>] handle_irq_event+0xa7/0x140 kernel/irq/handle.c:205 [<ffffffff81484573>] handle_edge_irq+0x1e3/0x8d0 kernel/irq/chip.c:623 [< inline >] generic_handle_irq_desc include/linux/irqdesc.h:146 [<ffffffff811a92bc>] handle_irq+0x10c/0x2a0 arch/x86/kernel/irq_64.c:78 [<ffffffff811a7e4d>] do_IRQ+0x7d/0x1a0 arch/x86/kernel/irq.c:240 [<ffffffff86653d4c>] common_interrupt+0x8c/0x8c arch/x86/entry/entry_64.S:520 <EOI> [< inline >] rcu_lock_acquire include/linux/rcupdate.h:490 [< inline >] rcu_read_lock include/linux/rcupdate.h:874 [<ffffffff8164b4a1>] filemap_map_pages+0x131/0xba0 mm/filemap.c:2145 [< inline >] do_fault_around mm/memory.c:2943 [< inline >] do_read_fault mm/memory.c:2962 [< inline >] do_fault mm/memory.c:3133 [< inline >] handle_pte_fault mm/memory.c:3308 [< inline >] __handle_mm_fault mm/memory.c:3418 [<ffffffff816efb16>] handle_mm_fault+0x2516/0x49a0 mm/memory.c:3447 [<ffffffff8127dc16>] __do_page_fault+0x376/0x960 arch/x86/mm/fault.c:1238 [<ffffffff8127e358>] trace_do_page_fault+0xe8/0x420 arch/x86/mm/fault.c:1331 [<ffffffff8126f514>] do_async_page_fault+0x14/0xd0 arch/x86/kernel/kvm.c:264 [<ffffffff86655578>] async_page_fault+0x28/0x30 arch/x86/entry/entry_64.S:986 Fix it by ensuring that the polling path is holding the host lock before entering ata_sff_hsm_move() so that all hardware accesses and state updates are performed under the host lock. Signed-off-by:
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Tejun Heo authored
commit 041bd12e upstream. This reverts commit 874bbfe6. Workqueue used to implicity guarantee that work items queued without explicit CPU specified are put on the local CPU. Recent changes in timer broke the guarantee and led to vmstat breakage which was fixed by 176bed1d ("vmstat: explicitly schedule per-cpu work on the CPU we need it to run on"). vmstat is the most likely to expose the issue and it's quite possible that there are other similar problems which are a lot more difficult to trigger. As a preventive measure, 874bbfe6 ("workqueue: make sure delayed work run in local cpu") was applied to restore the local CPU guarnatee. Unfortunately, the change exposed a bug in timer code which got fixed by 22b886dd ("timers: Use proper base migration in add_timer_on()"). Due to code restructuring, the commit couldn't be backported beyond certain point and stable kernels which only had 874bbfe6 started crashing. The local CPU guarantee was accidental more than anything else and we want to get rid of it anyway. As, with the vmstat case fixed, 874bbfe6 is causing more problems than it's fixing, it has been decided to take the chance and officially break the guarantee by reverting the commit. A debug feature will be added to force foreign CPU assignment to expose cases relying on the guarantee and fixes for the individual cases will be backported to stable as necessary. Signed-off-by:
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Johannes Berg authored
commit 6736fde9 upstream. The code within wait_event_interruptible() is called with !TASK_RUNNING, so mustn't call any functions that can sleep, like mutex_lock(). Since we re-check the list_empty() in a loop after the wait, it's safe to simply use list_empty() without locking. This bug has existed forever, but was only discovered now because all userspace implementations, including the default 'rfkill' tool, use poll() or select() to get a readable fd before attempting to read. Fixes: c64fb016 ("rfkill: create useful userspace interface") Reported-by:
Johannes Berg <johannes.berg@intel.com> Signed-off-by:
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Oliver Neukum authored
commit e912e685 upstream. This phone needs to be handled by a specialised firmware tool and is reported to crash irrevocably if cdc-acm takes it. Signed-off-by:
Oliver Neukum <oneukum@suse.com> Signed-off-by:
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Ilya Dryomov authored
commit e7a88e82 upstream. The contract between try_read() and try_write() is that when called each processes as much data as possible. When instructed by osd_client to skip a message, try_read() is violating this contract by returning after receiving and discarding a single message instead of checking for more. try_write() then gets a chance to write out more requests, generating more replies/skips for try_read() to handle, forcing the messenger into a starvation loop. Reported-by:
Varada Kari <Varada.Kari@sandisk.com> Signed-off-by:
Ilya Dryomov <idryomov@gmail.com> Tested-by:
Alex Elder <elder@linaro.org> Signed-off-by:
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Mike Marciniszyn authored
commit 09dc9cd6 upstream. The code produces the following trace: [1750924.419007] general protection fault: 0000 [#3] SMP [1750924.420364] Modules linked in: nfnetlink autofs4 rpcsec_gss_krb5 nfsv4 dcdbas rfcomm bnep bluetooth nfsd auth_rpcgss nfs_acl dm_multipath nfs lockd scsi_dh sunrpc fscache radeon ttm drm_kms_helper drm serio_raw parport_pc ppdev i2c_algo_bit lpc_ich ipmi_si ib_mthca ib_qib dca lp parport ib_ipoib mac_hid ib_cm i3000_edac ib_sa ib_uverbs edac_core ib_umad ib_mad ib_core ib_addr tg3 ptp dm_mirror dm_region_hash dm_log psmouse pps_core [1750924.420364] CPU: 1 PID: 8401 Comm: python Tainted: G D 3.13.0-39-generic #66-Ubuntu [1750924.420364] Hardware name: Dell Computer Corporation PowerEdge 860/0XM089, BIOS A04 07/24/2007 [1750924.420364] task: ffff8800366a9800 ti: ffff88007af1c000 task.ti: ffff88007af1c000 [1750924.420364] RIP: 0010:[<ffffffffa0131d51>] [<ffffffffa0131d51>] qib_mcast_qp_free+0x11/0x50 [ib_qib] [1750924.420364] RSP: 0018:ffff88007af1dd70 EFLAGS: 00010246 [1750924.420364] RAX: 0000000000000001 RBX: ffff88007b822688 RCX: 000000000000000f [1750924.420364] RDX: ffff88007b822688 RSI: ffff8800366c15a0 RDI: 6764697200000000 [1750924.420364] RBP: ffff88007af1dd78 R08: 0000000000000001 R09: 0000000000000000 [1750924.420364] R10: 0000000000000011 R11: 0000000000000246 R12: ffff88007baa1d98 [1750924.420364] R13: ffff88003ecab000 R14: ffff88007b822660 R15: 0000000000000000 [1750924.420364] FS: 00007ffff7fd8740(0000) GS:ffff88007fc80000(0000) knlGS:0000000000000000 [1750924.420364] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [1750924.420364] CR2: 00007ffff597c750 CR3: 000000006860b000 CR4: 00000000000007e0 [1750924.420364] Stack: [1750924.420364] ffff88007b822688 ffff88007af1ddf0 ffffffffa0132429 000000007af1de20 [1750924.420364] ffff88007baa1dc8 ffff88007baa0000 ffff88007af1de70 ffffffffa00cb313 [1750924.420364] 00007fffffffde88 0000000000000000 0000000000000008 ffff88003ecab000 [1750924.420364] Call Trace: [1750924.420364] [<ffffffffa0132429>] qib_multicast_detach+0x1e9/0x350 [ib_qib] [1750924.568035] [<ffffffffa00cb313>] ? ib_uverbs_modify_qp+0x323/0x3d0 [ib_uverbs] [1750924.568035] [<ffffffffa0092d61>] ib_detach_mcast+0x31/0x50 [ib_core] [1750924.568035] [<ffffffffa00cc213>] ib_uverbs_detach_mcast+0x93/0x170 [ib_uverbs] [1750924.568035] [<ffffffffa00c61f6>] ib_uverbs_write+0xc6/0x2c0 [ib_uverbs] [1750924.568035] [<ffffffff81312e68>] ? apparmor_file_permission+0x18/0x20 [1750924.568035] [<ffffffff812d4cd3>] ? security_file_permission+0x23/0xa0 [1750924.568035] [<ffffffff811bd214>] vfs_write+0xb4/0x1f0 [1750924.568035] [<ffffffff811bdc49>] SyS_write+0x49/0xa0 [1750924.568035] [<ffffffff8172f7ed>] system_call_fastpath+0x1a/0x1f [1750924.568035] Code: 66 2e 0f 1f 84 00 00 00 00 00 31 c0 5d c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb 48 8b 7f 10 <f0> ff 8f 40 01 00 00 74 0e 48 89 df e8 8e f8 06 e1 5b 5d c3 0f [1750924.568035] RIP [<ffffffffa0131d51>] qib_mcast_qp_free+0x11/0x50 [ib_qib] [1750924.568035] RSP <ffff88007af1dd70> [1750924.650439] ---[ end trace 73d5d4b3f8ad4851 ] The fix is to note the qib_mcast_qp that was found. If none is found, then return EINVAL indicating the error. Reviewed-by:
Dennis Dalessandro <dennis.dalessandro@intel.com> Reported-by:
Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by:
Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by:
Doug Ledford <dledford@redhat.com> Signed-off-by:
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Rasmus Villemoes authored
commit bc3f5d8c upstream. We need to use post-decrement to get the pci_map_page undone also for i==0, and to avoid some very unpleasant behaviour if pci_map_page failed already at i==0. Reviewed-by:
Christian König <christian.koenig@amd.com> Signed-off-by:
Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
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Nicolai Hähnle authored
commit f6ff4f67 upstream. An arbitrary amount of time can pass between spin_unlock and radeon_fence_wait_any, so we need to ensure that nobody frees the fences from under us. Based on the analogous fix for amdgpu. Signed-off-by:
Nicolai Hähnle <nicolai.haehnle@amd.com> Reviewed-by:
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Alex Deucher authored
commit 0eb1c3d4 upstream. Combine the two quirks. bug: https://bugzilla.kernel.org/show_bug.cgi?id=109481Signed-off-by:
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Rob Clark authored
commit 96c5d076 upstream. Signed-off-by:
Rob Clark <robdclark@gmail.com> Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>. Signed-off-by:
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Dmitry V. Levin authored
commit 525fd5a9 upstream. The value returned by sys_personality has type "long int". It is saved to a variable of type "int", which is not a problem yet because the type of task_struct->pesonality is "unsigned int". The problem is the sign extension from "int" to "long int" that happens on return from sys_sparc64_personality. For example, a userspace call personality((unsigned) -EINVAL) will result to any subsequent personality call, including absolutely harmless read-only personality(0xffffffff) call, failing with errno set to EINVAL. Signed-off-by:
Dmitry V. Levin <ldv@altlinux.org> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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Linus Walleij authored
commit 0bcb7efd upstream. commit 4956e109 ("ARM: 6244/1: mmci: add variant data and default MCICLOCK support") added variant data for ARM, U300 and Ux500 variants. The Nomadik NHK8815/8820 variant was erroneously labeled as a U300 variant, and when the proper Nomadik variant was later introduced in commit 34fd4213 ("ARM: 7378/1: mmci: add support for the Nomadik MMCI variant") this was not fixes. Let's say this fixes the latter commit as there was no proper Nomadik support until then. Fixes: 34fd4213 ("ARM: 7378/1: mmci: add support for the Nomadik...") Signed-off-by:
Linus Walleij <linus.walleij@linaro.org> Signed-off-by:
Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by:
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Richard Cochran authored
commit 1b9f2372 upstream. The posix_clock_poll function is supposed to return a bit mask of POLLxxx values. However, in case the hardware has disappeared (due to hot plugging for example) this code returns -ENODEV in a futile attempt to throw an error at the file descriptor level. The kernel's file_operations interface does not accept such error codes from the poll method. Instead, this function aught to return POLLERR. The value -ENODEV does, in fact, contain the POLLERR bit (and almost all the other POLLxxx bits as well), but only by chance. This patch fixes code to return a proper bit mask. Credit goes to Markus Elfring for pointing out the suspicious signed/unsigned mismatch. Reported-by:
Markus Elfring <elfring@users.sourceforge.net> igned-off-by:
Richard Cochran <richardcochran@gmail.com> Cc: John Stultz <john.stultz@linaro.org> Cc: Julia Lawall <julia.lawall@lip6.fr> Link: http://lkml.kernel.org/r/1450819198-17420-1-git-send-email-richardcochran@gmail.comSigned-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Mikulas Patocka authored
commit 385277bf upstream. When there is an error copying a chunk dm-snapshot can incorrectly hold associated bios indefinitely, resulting in hung IO. The function copy_callback sets pe->error if there was error copying the chunk, and then calls complete_exception. complete_exception calls pending_complete on error, otherwise it calls commit_exception with commit_callback (and commit_callback calls complete_exception). The persistent exception store (dm-snap-persistent.c) assumes that calls to prepare_exception and commit_exception are paired. persistent_prepare_exception increases ps->pending_count and persistent_commit_exception decreases it. If there is a copy error, persistent_prepare_exception is called but persistent_commit_exception is not. This results in the variable ps->pending_count never returning to zero and that causes some pending exceptions (and their associated bios) to be held forever. Fix this by unconditionally calling commit_exception regardless of whether the copy was successful. A new "valid" parameter is added to commit_exception -- when the copy fails this parameter is set to zero so that the chunk that failed to copy (and all following chunks) is not recorded in the snapshot store. Also, remove commit_callback now that it is merely a wrapper around pending_complete. Signed-off-by:
Mikulas Patocka <mpatocka@redhat.com> Signed-off-by:
Mike Snitzer <snitzer@redhat.com> Signed-off-by:
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Mauro Carvalho Chehab authored
commit e8beb023 upstream. The tda1004x was updating the properties cache before locking. If the device is not locked, the data at the registers are just random values with no real meaning. This caused the driver to fail with libdvbv5, as such library calls GET_PROPERTY from time to time, in order to return the DVB stats. Tested with a saa7134 card 78: ASUSTeK P7131 Dual, vendor PCI ID: 1043:4862 Signed-off-by:
Mauro Carvalho Chehab <mchehab@osg.samsung.com> Signed-off-by:
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Antonio Ospite authored
commit dcc7fdbe upstream. v4l2-compliance sends a zeroed struct v4l2_streamparm in v4l2-test-formats.cpp::testParmType(), and this results in a division by 0 in some gspca subdrivers: divide error: 0000 [#1] SMP Modules linked in: gspca_ov534 gspca_main ... CPU: 0 PID: 17201 Comm: v4l2-compliance Not tainted 4.3.0-rc2-ao2 #1 Hardware name: System manufacturer System Product Name/M2N-E SLI, BIOS ASUS M2N-E SLI ACPI BIOS Revision 1301 09/16/2010 task: ffff8800818306c0 ti: ffff880095c4c000 task.ti: ffff880095c4c000 RIP: 0010:[<ffffffffa079bd62>] [<ffffffffa079bd62>] sd_set_streamparm+0x12/0x60 [gspca_ov534] RSP: 0018:ffff880095c4fce8 EFLAGS: 00010296 RAX: 0000000000000000 RBX: ffff8800c9522000 RCX: ffffffffa077a140 RDX: 0000000000000000 RSI: ffff880095e0c100 RDI: ffff8800c9522000 RBP: ffff880095e0c100 R08: ffffffffa077a100 R09: 00000000000000cc R10: ffff880067ec7740 R11: 0000000000000016 R12: ffffffffa07bb400 R13: 0000000000000000 R14: ffff880081b6a800 R15: 0000000000000000 FS: 00007fda0de78740(0000) GS:ffff88012fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000014630f8 CR3: 00000000cf349000 CR4: 00000000000006f0 Stack: ffffffffa07a6431 ffff8800c9522000 ffffffffa077656e 00000000c0cc5616 ffff8800c9522000 ffffffffa07a5e20 ffff880095e0c100 0000000000000000 ffff880067ec7740 ffffffffa077a140 ffff880067ec7740 0000000000000016 Call Trace: [<ffffffffa07a6431>] ? v4l_s_parm+0x21/0x50 [videodev] [<ffffffffa077656e>] ? vidioc_s_parm+0x4e/0x60 [gspca_main] [<ffffffffa07a5e20>] ? __video_do_ioctl+0x280/0x2f0 [videodev] [<ffffffffa07a5ba0>] ? video_ioctl2+0x20/0x20 [videodev] [<ffffffffa07a59b9>] ? video_usercopy+0x319/0x4e0 [videodev] [<ffffffff81182dc1>] ? page_add_new_anon_rmap+0x71/0xa0 [<ffffffff811afb92>] ? mem_cgroup_commit_charge+0x52/0x90 [<ffffffff81179b18>] ? handle_mm_fault+0xc18/0x1680 [<ffffffffa07a15cc>] ? v4l2_ioctl+0xac/0xd0 [videodev] [<ffffffff811c846f>] ? do_vfs_ioctl+0x28f/0x480 [<ffffffff811c86d4>] ? SyS_ioctl+0x74/0x80 [<ffffffff8154a8b6>] ? entry_SYSCALL_64_fastpath+0x16/0x75 Code: c7 93 d9 79 a0 5b 5d e9 f1 f3 9a e0 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 53 31 d2 48 89 fb 48 83 ec 08 8b 46 10 <f7> 76 0c 80 bf ac 0c 00 00 00 88 87 4e 0e 00 00 74 09 80 bf 4f RIP [<ffffffffa079bd62>] sd_set_streamparm+0x12/0x60 [gspca_ov534] RSP <ffff880095c4fce8> ---[ end trace 279710c2c6c72080 ]--- Following what the doc says about a zeroed timeperframe (see http://www.linuxtv.org/downloads/v4l-dvb-apis/vidioc-g-parm.html): ... To reset manually applications can just set this field to zero. fix the issue by resetting the frame rate to a default value in case of an unusable timeperframe. The fix is done in the subdrivers instead of gspca.c because only the subdrivers have notion of a default frame rate to reset the camera to. Signed-off-by:
Antonio Ospite <ao2@ao2.it> Reviewed-by:
Hans de Goede <hdegoede@redhat.com> Signed-off-by:
Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by:
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Malcolm Priestley authored
commit c9d57de6 upstream. When in FE_TUNE_MODE_ONESHOT the frontend must report the actual capabilities so user can take appropriate action. With frontends that can't do auto inversion this is done by dvb-core automatically so CAN_INVERSION_AUTO is valid. However, when in FE_TUNE_MODE_ONESHOT this is not true. So only set FE_CAN_INVERSION_AUTO in modes other than FE_TUNE_MODE_ONESHOT Signed-off-by:
Malcolm Priestley <tvboxspy@gmail.com> Signed-off-by:
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Vegard Nossum authored
commit 9f2dfda2 upstream. An inverted return value check in hostfs_mknod() caused the function to return success after handling it as an error (and cleaning up). It resulted in the following segfault when trying to bind() a named unix socket: Pid: 198, comm: a.out Not tainted 4.4.0-rc4 RIP: 0033:[<0000000061077df6>] RSP: 00000000daae5d60 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 000000006092a460 RCX: 00000000dfc54208 RDX: 0000000061073ef1 RSI: 0000000000000070 RDI: 00000000e027d600 RBP: 00000000daae5de0 R08: 00000000da980ac0 R09: 0000000000000000 R10: 0000000000000003 R11: 00007fb1ae08f72a R12: 0000000000000000 R13: 000000006092a460 R14: 00000000daaa97c0 R15: 00000000daaa9a88 Kernel panic - not syncing: Kernel mode fault at addr 0x40, ip 0x61077df6 CPU: 0 PID: 198 Comm: a.out Not tainted 4.4.0-rc4 #1 Stack: e027d620 dfc54208 0000006f da981398 61bee000 0000c1ed daae5de0 0000006e e027d620 dfcd4208 00000005 6092a460 Call Trace: [<60dedc67>] SyS_bind+0xf7/0x110 [<600587be>] handle_syscall+0x7e/0x80 [<60066ad7>] userspace+0x3e7/0x4e0 [<6006321f>] ? save_registers+0x1f/0x40 [<6006c88e>] ? arch_prctl+0x1be/0x1f0 [<60054985>] fork_handler+0x85/0x90 Let's also get rid of the "cosmic ray protection" while we're at it. Fixes: e9193059 "hostfs: fix races in dentry_name() and inode_name()" Signed-off-by:
Vegard Nossum <vegard.nossum@oracle.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
Richard Weinberger <richard@nod.at> Signed-off-by:
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Vegard Nossum authored
commit 0754fb29 upstream. I was seeing some really weird behaviour where piping UML's output somewhere would cause output to get duplicated: $ ./vmlinux | head -n 40 Checking that ptrace can change system call numbers...Core dump limits : soft - 0 hard - NONE OK Checking syscall emulation patch for ptrace...Core dump limits : soft - 0 hard - NONE OK Checking advanced syscall emulation patch for ptrace...Core dump limits : soft - 0 hard - NONE OK Core dump limits : soft - 0 hard - NONE This is because these tests do a fork() which duplicates the non-empty stdout buffer, then glibc flushes the duplicated buffer as each child exits. A simple workaround is to flush before forking. Signed-off-by:
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