- 01 Oct, 2013 21 commits
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David Herrmann authored
commit 101b96f3 upstream. DRM_IOCTL_MODE_GETFB is used to retrieve information about a given framebuffer ID. It is a read-only helper and was thus declassified for unprivileged access in: commit a14b1b42 Author: Mandeep Singh Baines <mandeep.baines@gmail.com> Date: Fri Jan 20 12:11:16 2012 -0800 drm: remove master fd restriction on mode setting getters However, alongside width, height and stride information, DRM_IOCTL_MODE_GETFB also passes back a handle to the underlying buffer of the framebuffer. This handle allows users to mmap() it and read or write into it. Obviously, this should be restricted to DRM-Master. With the current setup, *any* process with access to /dev/dri/card0 (which means any process with access to hardware-accelerated rendering) can access the current screen framebuffer and modify it ad libitum. For backwards-compatibility reasons we want to keep the DRM_IOCTL_MODE_GETFB call unprivileged. Besides, it provides quite useful information regarding screen setup. So we simply test whether the caller is the current DRM-Master and if not, we return 0 as handle, which is always invalid. A following DRM_IOCTL_GEM_CLOSE on this handle will fail with EINVAL, but we accept this. Users shouldn't test for errors during GEM_CLOSE, anyway. And it is still better as a failing MODE_GETFB call. v2: add capable(CAP_SYS_ADMIN) check for compatibility with i-g-t Signed-off-by:
David Herrmann <dh.herrmann@gmail.com> Reviewed-by:
Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:
Dave Airlie <airlied@redhat.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Daniel Vetter authored
commit 17e1df07 upstream. My g33 here seems to be shockingly good at hitting them all. This time around kms_flip/flip-vs-panning-vs-hang blows up: intel_crtc_wait_for_pending_flips correctly checks for gpu hangs and if a gpu hang is pending aborts the wait for outstanding flips so that the setcrtc call will succeed and release the crtc mutex. And the gpu hang handler needs that lock in intel_display_handle_reset to be able to complete outstanding flips. The problem is that we can race in two ways: - Waiters on the dev_priv->pending_flip_queue aren't woken up after we've the reset as pending, but before we actually start the reset work. This means that the waiter doesn't notice the pending reset and hence will keep on hogging the locks. Like with dev->struct_mutex and the ring->irq_queue wait queues we there need to wake up everyone that potentially holds a lock which the reset handler needs. - intel_display_handle_reset was called _after_ we've already signalled the completion of the reset work. Which means a waiter could sneak in, grab the lock and never release it (since the pageflips won't ever get released). Similar to resetting the gem state all the reset work must complete before we update the reset counter. Contrary to the gem reset we don't need to have a second explicit wake up call since that will have happened already when completing the pageflips. We also don't have any issues that the completion happens while the reset state is still pending - wait_for_pending_flips is only there to ensure we display the right frame. After a gpu hang&reset events such guarantees are out the window anyway. This is in contrast to the gem code where too-early wake-up would result in unnecessary restarting of ioctls. Also, since we've gotten these various deadlocks and ordering constraints wrong so often throw copious amounts of comments at the code. This deadlock regression has been introduced in the commit which added the pageflip reset logic to the gpu hang work: commit 96a02917 Author: Ville Syrjälä <ville.syrjala@linux.intel.com> Date: Mon Feb 18 19:08:49 2013 +0200 drm/i915: Finish page flips and update primary planes after a GPU reset v2: - Add comments to explain how the wake_up serves as memory barriers for the atomic_t reset counter. - Improve the comments a bit as suggested by Chris Wilson. - Extract the wake_up calls before/after the reset into a little i915_error_wake_up and unconditionally wake up the pending_flip_queue waiters, again as suggested by Chris Wilson. v3: Throw copious amounts of comments at i915_error_wake_up as suggested by Chris Wilson. Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by:
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Daniel Vetter authored
commit 122f46ba upstream. Since we've started to clean up pending flips when the gpu hangs in commit 96a02917 Author: Ville Syrjälä <ville.syrjala@linux.intel.com> Date: Mon Feb 18 19:08:49 2013 +0200 drm/i915: Finish page flips and update primary planes after a GPU reset the gpu reset work now also grabs modeset locks. But since work items on our private work queue are not allowed to do that due to the flush_workqueue from the pageflip code this results in a neat deadlock: INFO: task kms_flip:14676 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kms_flip D ffff88019283a5c0 0 14676 13344 0x00000004 ffff88018e62dbf8 0000000000000046 ffff88013bdb12e0 ffff88018e62dfd8 ffff88018e62dfd8 00000000001d3b00 ffff88019283a5c0 ffff88018ec21000 ffff88018f693f00 ffff88018eece000 ffff88018e62dd60 ffff88018eece898 Call Trace: [<ffffffff8138ee7b>] schedule+0x60/0x62 [<ffffffffa046c0dd>] intel_crtc_wait_for_pending_flips+0xb2/0x114 [i915] [<ffffffff81050ff4>] ? finish_wait+0x60/0x60 [<ffffffffa0478041>] intel_crtc_set_config+0x7f3/0x81e [i915] [<ffffffffa031780a>] drm_mode_set_config_internal+0x4f/0xc6 [drm] [<ffffffffa0319cf3>] drm_mode_setcrtc+0x44d/0x4f9 [drm] [<ffffffff810e44da>] ? might_fault+0x38/0x86 [<ffffffffa030d51f>] drm_ioctl+0x2f9/0x447 [drm] [<ffffffff8107a722>] ? trace_hardirqs_off+0xd/0xf [<ffffffffa03198a6>] ? drm_mode_setplane+0x343/0x343 [drm] [<ffffffff8112222f>] ? mntput_no_expire+0x3e/0x13d [<ffffffff81117f33>] vfs_ioctl+0x18/0x34 [<ffffffff81118776>] do_vfs_ioctl+0x396/0x454 [<ffffffff81396b37>] ? sysret_check+0x1b/0x56 [<ffffffff81118886>] SyS_ioctl+0x52/0x7d [<ffffffff81396b12>] system_call_fastpath+0x16/0x1b 2 locks held by kms_flip/14676: #0: (&dev->mode_config.mutex){+.+.+.}, at: [<ffffffffa0316545>] drm_modeset_lock_all+0x22/0x59 [drm] #1: (&crtc->mutex){+.+.+.}, at: [<ffffffffa031656b>] drm_modeset_lock_all+0x48/0x59 [drm] INFO: task kworker/u8:4:175 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u8:4 D ffff88018de9a5c0 0 175 2 0x00000000 Workqueue: i915 i915_error_work_func [i915] ffff88018e37dc30 0000000000000046 ffff8801938ab8a0 ffff88018e37dfd8 ffff88018e37dfd8 00000000001d3b00 ffff88018de9a5c0 ffff88018ec21018 0000000000000246 ffff88018e37dca0 000000005a865a86 ffff88018de9a5c0 Call Trace: [<ffffffff8138ee7b>] schedule+0x60/0x62 [<ffffffff8138f23d>] schedule_preempt_disabled+0x9/0xb [<ffffffff8138d0cd>] mutex_lock_nested+0x205/0x3b1 [<ffffffffa0477094>] ? intel_display_handle_reset+0x7e/0xbd [i915] [<ffffffffa0477094>] ? intel_display_handle_reset+0x7e/0xbd [i915] [<ffffffffa0477094>] intel_display_handle_reset+0x7e/0xbd [i915] [<ffffffffa044e0a2>] i915_error_work_func+0x128/0x147 [i915] [<ffffffff8104a89a>] process_one_work+0x1d4/0x35a [<ffffffff8104a821>] ? process_one_work+0x15b/0x35a [<ffffffff8104b4a5>] worker_thread+0x144/0x1f0 [<ffffffff8104b361>] ? rescuer_thread+0x275/0x275 [<ffffffff8105076d>] kthread+0xac/0xb4 [<ffffffff81059d30>] ? finish_task_switch+0x3b/0xc0 [<ffffffff810506c1>] ? __kthread_parkme+0x60/0x60 [<ffffffff81396a6c>] ret_from_fork+0x7c/0xb0 [<ffffffff810506c1>] ? __kthread_parkme+0x60/0x60 3 locks held by kworker/u8:4/175: #0: (i915){.+.+.+}, at: [<ffffffff8104a821>] process_one_work+0x15b/0x35a #1: ((&dev_priv->gpu_error.work)){+.+.+.}, at: [<ffffffff8104a821>] process_one_work+0x15b/0x35a #2: (&crtc->mutex){+.+.+.}, at: [<ffffffffa0477094>] intel_display_handle_reset+0x7e/0xbd [i915] This blew up while running kms_flip/flip-vs-panning-vs-hang-interruptible on one of my older machines. Unfortunately (despite the proper lockdep annotations for flush_workqueue) lockdep still doesn't detect this correctly, so we need to rely on chance to discover these bugs. Apply the usual bugfix and schedule the reset work on the system workqueue to keep our own driver workqueue free of any modeset lock grabbing. Note that this is not a terribly serious regression since before the offending commit we'd simply have stalled userspace forever due to failing to abort all outstanding pageflips. v2: Add a comment as requested by Chris. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by:
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Alan Stern authored
commit 5f5610f6 upstream. This patch fixes a NULL pointer dereference and a WARN_ON in dummy-hcd. These things were the result of moving to the UDC core framework, and possibly of changes to that framework. Now unloading a gadget driver causes the UDC to be stopped after the gadget driver is unbound, not before. Therefore the "driver" argument to dummy_udc_stop() can be NULL, so we must not try to print the driver's name without checking first. Also, the UDC framework automatically unregisters the gadget when the UDC is deleted. Therefore a sysfs attribute file attached to the gadget must be removed before the UDC is deleted, not after. Signed-off-by:
Alan Stern <stern@rowland.harvard.edu> Signed-off-by:
Felipe Balbi <balbi@ti.com> Signed-off-by:
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Kees Cook authored
commit 297502ab upstream. A HID device could send a malicious output report that would cause the logitech-dj HID driver to leak kernel memory contents to the device, or trigger a NULL dereference during initialization: [ 304.424553] usb 1-1: New USB device found, idVendor=046d, idProduct=c52b ... [ 304.780467] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 [ 304.781409] IP: [<ffffffff815d50aa>] logi_dj_recv_send_report.isra.11+0x1a/0x90 CVE-2013-2895 Signed-off-by:
Kees Cook <keescook@chromium.org> Signed-off-by:
Benjamin Tissoires <benjamin.tissoires@gmail.com> Signed-off-by:
Jiri Kosina <jkosina@suse.cz> Signed-off-by:
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Kees Cook authored
commit 0a9cd0a8 upstream. A HID device could send a malicious output report that would cause the lenovo-tpkbd HID driver to write just beyond the output report allocation during initialization, causing a heap overflow: [ 76.109807] usb 1-1: New USB device found, idVendor=17ef, idProduct=6009 ... [ 80.462540] BUG kmalloc-192 (Tainted: G W ): Redzone overwritten CVE-2013-2894 Signed-off-by:
Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by:
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Kees Cook authored
commit 41df7f6d upstream. A HID device could send a malicious output report that would cause the steelseries HID driver to write beyond the output report allocation during initialization, causing a heap overflow: [ 167.981534] usb 1-1: New USB device found, idVendor=1038, idProduct=1410 ... [ 182.050547] BUG kmalloc-256 (Tainted: G W ): Redzone overwritten CVE-2013-2891 Signed-off-by:
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Benjamin Tissoires authored
commit 0ccdd9e7 upstream. If tpkbd_probe_tp() bails out, the probe() function return an error, but hid_hw_stop() is never called. fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1003998Signed-off-by:
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Kees Cook authored
commit 78214e81 upstream. The zeroplus HID driver was not checking the size of allocated values in fields it used. A HID device could send a malicious output report that would cause the driver to write beyond the output report allocation during initialization, causing a heap overflow: [ 1442.728680] usb 1-1: New USB device found, idVendor=0c12, idProduct=0005 ... [ 1466.243173] BUG kmalloc-192 (Tainted: G W ): Redzone overwritten CVE-2013-2889 Signed-off-by:
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Kees Cook authored
commit 0fb6bd06 upstream. A HID device could send a malicious output report that would cause the lg, lg3, and lg4 HID drivers to write beyond the output report allocation during an event, causing a heap overflow: [ 325.245240] usb 1-1: New USB device found, idVendor=046d, idProduct=c287 ... [ 414.518960] BUG kmalloc-4096 (Not tainted): Redzone overwritten Additionally, while lg2 did correctly validate the report details, it was cleaned up and shortened. CVE-2013-2893 Signed-off-by:
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Benjamin Tissoires authored
commit 8821f5dc upstream. When working on report indexes, always validate that they are in bounds. Without this, a HID device could report a malicious feature report that could trick the driver into a heap overflow: [ 634.885003] usb 1-1: New USB device found, idVendor=0596, idProduct=0500 ... [ 676.469629] BUG kmalloc-192 (Tainted: G W ): Redzone overwritten Note that we need to change the indexes from s8 to s16 as they can be between -1 and 255. CVE-2013-2897 Signed-off-by:
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Benjamin Tissoires authored
commit cc6b54aa upstream. When dealing with usage_index, be sure to properly use unsigned instead of int to avoid overflows. When working on report fields, always validate that their report_counts are in bounds. Without this, a HID device could report a malicious feature report that could trick the driver into a heap overflow: [ 634.885003] usb 1-1: New USB device found, idVendor=0596, idProduct=0500 ... [ 676.469629] BUG kmalloc-192 (Tainted: G W ): Redzone overwritten CVE-2013-2897 Signed-off-by:
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Kees Cook authored
commit 331415ff upstream. Many drivers need to validate the characteristics of their HID report during initialization to avoid misusing the reports. This adds a common helper to perform validation of the report exisitng, the field existing, and the expected number of values within the field. Signed-off-by:
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Daisuke Nishimura authored
commit 6c9a27f5 upstream. There is a small race between copy_process() and cgroup_attach_task() where child->se.parent,cfs_rq points to invalid (old) ones. parent doing fork() | someone moving the parent to another cgroup -------------------------------+--------------------------------------------- copy_process() + dup_task_struct() -> parent->se is copied to child->se. se.parent,cfs_rq of them point to old ones. cgroup_attach_task() + cgroup_task_migrate() -> parent->cgroup is updated. + cpu_cgroup_attach() + sched_move_task() + task_move_group_fair() +- set_task_rq() -> se.parent,cfs_rq of parent are updated. + cgroup_fork() -> parent->cgroup is copied to child->cgroup. (*1) + sched_fork() + task_fork_fair() -> se.parent,cfs_rq of child are accessed while they point to old ones. (*2) In the worst case, this bug can lead to "use-after-free" and cause a panic, because it's new cgroup's refcount that is incremented at (*1), so the old cgroup(and related data) can be freed before (*2). In fact, a panic caused by this bug was originally caught in RHEL6.4. BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff81051e3e>] sched_slice+0x6e/0xa0 [...] Call Trace: [<ffffffff81051f25>] place_entity+0x75/0xa0 [<ffffffff81056a3a>] task_fork_fair+0xaa/0x160 [<ffffffff81063c0b>] sched_fork+0x6b/0x140 [<ffffffff8106c3c2>] copy_process+0x5b2/0x1450 [<ffffffff81063b49>] ? wake_up_new_task+0xd9/0x130 [<ffffffff8106d2f4>] do_fork+0x94/0x460 [<ffffffff81072a9e>] ? sys_wait4+0xae/0x100 [<ffffffff81009598>] sys_clone+0x28/0x30 [<ffffffff8100b393>] stub_clone+0x13/0x20 [<ffffffff8100b072>] ? system_call_fastpath+0x16/0x1b Signed-off-by:
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by:
Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/039601ceae06$733d3130$59b79390$@mxp.nes.nec.co.jpSigned-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
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Stanislaw Gruszka authored
commit 5a8e01f8 upstream. scale_stime() silently assumes that stime < rtime, otherwise when stime == rtime and both values are big enough (operations on them do not fit in 32 bits), the resulting scaling stime can be bigger than rtime. In consequence utime = rtime - stime results in negative value. User space visible symptoms of the bug are overflowed TIME values on ps/top, for example: $ ps aux | grep rcu root 8 0.0 0.0 0 0 ? S 12:42 0:00 [rcuc/0] root 9 0.0 0.0 0 0 ? S 12:42 0:00 [rcub/0] root 10 62422329 0.0 0 0 ? R 12:42 21114581:37 [rcu_preempt] root 11 0.1 0.0 0 0 ? S 12:42 0:02 [rcuop/0] root 12 62422329 0.0 0 0 ? S 12:42 21114581:35 [rcuop/1] root 10 62422329 0.0 0 0 ? R 12:42 21114581:37 [rcu_preempt] or overflowed utime values read directly from /proc/$PID/stat Reference: https://lkml.org/lkml/2013/8/20/259Reported-and-tested-by:
Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by:
Stanislaw Gruszka <sgruszka@redhat.com> Cc: stable@vger.kernel.org Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Borislav Petkov <bp@alien8.de> Link: http://lkml.kernel.org/r/20130904131602.GC2564@redhat.comSigned-off-by:
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John Stultz authored
commit 7bd36014 upstream. Gerlando Falauto reported that when HRTICK is enabled, it is possible to trigger system deadlocks. These were hard to reproduce, as HRTICK has been broken in the past, but seemed to be connected to the timekeeping_seq lock. Since seqlock/seqcount's aren't supported w/ lockdep, I added some extra spinlock based locking and triggered the following lockdep output: [ 15.849182] ntpd/4062 is trying to acquire lock: [ 15.849765] (&(&pool->lock)->rlock){..-...}, at: [<ffffffff810aa9b5>] __queue_work+0x145/0x480 [ 15.850051] [ 15.850051] but task is already holding lock: [ 15.850051] (timekeeper_lock){-.-.-.}, at: [<ffffffff810df6df>] do_adjtimex+0x7f/0x100 <snip> [ 15.850051] Chain exists of: &(&pool->lock)->rlock --> &p->pi_lock --> timekeeper_lock [ 15.850051] Possible unsafe locking scenario: [ 15.850051] [ 15.850051] CPU0 CPU1 [ 15.850051] ---- ---- [ 15.850051] lock(timekeeper_lock); [ 15.850051] lock(&p->pi_lock); [ 15.850051] lock(timekeeper_lock); [ 15.850051] lock(&(&pool->lock)->rlock); [ 15.850051] [ 15.850051] *** DEADLOCK *** The deadlock was introduced by 06c017fd ("timekeeping: Hold timekeepering locks in do_adjtimex and hardpps") in 3.10 This patch avoids this deadlock, by moving the call to schedule_delayed_work() outside of the timekeeper lock critical section. Reported-by:
Gerlando Falauto <gerlando.falauto@keymile.com> Tested-by:
Lin Ming <minggr@gmail.com> Signed-off-by:
John Stultz <john.stultz@linaro.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: http://lkml.kernel.org/r/1378943457-27314-1-git-send-email-john.stultz@linaro.orgSigned-off-by:
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Stanislaw Gruszka authored
commit 6e956da2 upstream. We should not do temperature compensation on devices without EXTERNAL_TX_ALC bit set (called DynamicTxAgcControl on vendor driver). Such devices can have totally bogus TSSI parameters on the EEPROM, but still threaded by us as valid and result doing wrong TX power calculations. This fix inability to connect to AP on slightly longer distance on some Ralink chips/devices. Reported-and-tested-by:
Fabien ADAM <id2ndr@crocobox.org> Signed-off-by:
John W. Linville <linville@tuxdriver.com> Signed-off-by:
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Rafał Miłecki authored
commit 6a391e7b upstream. Some devices (BCM4749, BCM5357, BCM53572) have internal switch that requires initialization. We already have code for this, but because of the typo in code it was never working. This resulted in network not working for some routers and possibility of soft-bricking them. Use correct bit for switch initialization and fix typo in the define. Signed-off-by:
Rafał Miłecki <zajec5@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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Miklos Szeredi authored
commit dfb1d61b upstream. If an error occurs after having called finish_open() then fput() needs to be called on the already opened file. Signed-off-by:
Miklos Szeredi <mszeredi@suse.cz> Cc: Steve French <sfrench@samba.org> Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Fabio Porcedda authored
commit 00928204 upstream. Signed-off-by:
Fabio Porcedda <fabio.porcedda@gmail.com> Acked-by:
Oliver Neukum <oliver@neukum.org> Signed-off-by:
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Rafael J. Wysocki authored
commit 83414515 upstream. Commit 448bd857 (PCI/PM: add PCIe runtime D3cold support) added a piece of code to pci_acpi_wake_dev() causing that function to behave in a special way for devices in D3cold (so that their configuration registers are not accessed before those devices are resumed). However, it didn't take the clearing of the pme_poll flag into account. That has to be done for all devices, even if they are in D3cold, or pci_pme_list_scan() will not know that wakeup has been signaled for the device and will poll its PME Status bit unnecessarily. Fix the problem by moving the clearing of the pme_poll flag in pci_acpi_wake_dev() before the code introduced by commit 448bd857. Reported-and-tested-by:
David E. Box <david.e.box@intel.com> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by:
Bjorn Helgaas <bhelgaas@google.com> Signed-off-by:
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- 27 Sep, 2013 19 commits
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Greg Kroah-Hartman authored
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Miklos Szeredi authored
commit efeb9e60 upstream. Userspace can add names containing a slash character to the directory listing. Don't allow this as it could cause all sorts of trouble. Signed-off-by:
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Maxim Patlasov authored
commit 06a7c3c2 upstream. The way how fuse calls truncate_pagecache() from fuse_change_attributes() is completely wrong. Because, w/o i_mutex held, we never sure whether 'oldsize' and 'attr->size' are valid by the time of execution of truncate_pagecache(inode, oldsize, attr->size). In fact, as soon as we released fc->lock in the middle of fuse_change_attributes(), we completely loose control of actions which may happen with given inode until we reach truncate_pagecache. The list of potentially dangerous actions includes mmap-ed reads and writes, ftruncate(2) and write(2) extending file size. The typical outcome of doing truncate_pagecache() with outdated arguments is data corruption from user point of view. This is (in some sense) acceptable in cases when the issue is triggered by a change of the file on the server (i.e. externally wrt fuse operation), but it is absolutely intolerable in scenarios when a single fuse client modifies a file without any external intervention. A real life case I discovered by fsx-linux looked like this: 1. Shrinking ftruncate(2) comes to fuse_do_setattr(). The latter sends FUSE_SETATTR to the server synchronously, but before getting fc->lock ... 2. fuse_dentry_revalidate() is asynchronously called. It sends FUSE_LOOKUP to the server synchronously, then calls fuse_change_attributes(). The latter updates i_size, releases fc->lock, but before comparing oldsize vs attr->size.. 3. fuse_do_setattr() from the first step proceeds by acquiring fc->lock and updating attributes and i_size, but now oldsize is equal to outarg.attr.size because i_size has just been updated (step 2). Hence, fuse_do_setattr() returns w/o calling truncate_pagecache(). 4. As soon as ftruncate(2) completes, the user extends file size by write(2) making a hole in the middle of file, then reads data from the hole either by read(2) or mmap-ed read. The user expects to get zero data from the hole, but gets stale data because truncate_pagecache() is not executed yet. The scenario above illustrates one side of the problem: not truncating the page cache even though we should. Another side corresponds to truncating page cache too late, when the state of inode changed significantly. Theoretically, the following is possible: 1. As in the previous scenario fuse_dentry_revalidate() discovered that i_size changed (due to our own fuse_do_setattr()) and is going to call truncate_pagecache() for some 'new_size' it believes valid right now. But by the time that particular truncate_pagecache() is called ... 2. fuse_do_setattr() returns (either having called truncate_pagecache() or not -- it doesn't matter). 3. The file is extended either by write(2) or ftruncate(2) or fallocate(2). 4. mmap-ed write makes a page in the extended region dirty. The result will be the lost of data user wrote on the fourth step. The patch is a hotfix resolving the issue in a simplistic way: let's skip dangerous i_size update and truncate_pagecache if an operation changing file size is in progress. This simplistic approach looks correct for the cases w/o external changes. And to handle them properly, more sophisticated and intrusive techniques (e.g. NFS-like one) would be required. I'd like to postpone it until the issue is well discussed on the mailing list(s). Changed in v2: - improved patch description to cover both sides of the issue. Signed-off-by:
Maxim Patlasov <mpatlasov@parallels.com> Signed-off-by:
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Anand Avati authored
commit d331a415 upstream. Calls like setxattr and removexattr result in updation of ctime. Therefore invalidate inode attributes to force a refresh. Signed-off-by:
Anand Avati <avati@redhat.com> Reviewed-by:
Brian Foster <bfoster@redhat.com> Signed-off-by:
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Maxim Patlasov authored
commit 4a4ac4eb upstream. The patch fixes a race between ftruncate(2), mmap-ed write and write(2): 1) An user makes a page dirty via mmap-ed write. 2) The user performs shrinking truncate(2) intended to purge the page. 3) Before fuse_do_setattr calls truncate_pagecache, the page goes to writeback. fuse_writepage_locked fills FUSE_WRITE request and releases the original page by end_page_writeback. 4) fuse_do_setattr() completes and successfully returns. Since now, i_mutex is free. 5) Ordinary write(2) extends i_size back to cover the page. Note that fuse_send_write_pages do wait for fuse writeback, but for another page->index. 6) fuse_writepage_locked proceeds by queueing FUSE_WRITE request. fuse_send_writepage is supposed to crop inarg->size of the request, but it doesn't because i_size has already been extended back. Moving end_page_writeback to the end of fuse_writepage_locked fixes the race because now the fact that truncate_pagecache is successfully returned infers that fuse_writepage_locked has already called end_page_writeback. And this, in turn, infers that fuse_flush_writepages has already called fuse_send_writepage, and the latter used valid (shrunk) i_size. write(2) could not extend it because of i_mutex held by ftruncate(2). Signed-off-by:
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Mark Brown authored
commit 08442ce9 upstream. Otherwise any attempt to interact with the hardware will crash. This is what happens when drivers get written blind. Signed-off-by:
Mark Brown <broonie@linaro.org> Signed-off-by:
Mike Turquette <mturquette@linaro.org> Signed-off-by:
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Brian Norris authored
commit 68e80780 upstream. The code for NAND_BUSWIDTH_AUTO is broken. According to Alexander: "I have a problem with attach NAND UBI in 16 bit mode. NAND works fine if I specify NAND_BUSWIDTH_16 option, but not working with NAND_BUSWIDTH_AUTO option. In second case NAND chip is identifyed with ONFI." See his report for the rest of the details: http://lists.infradead.org/pipermail/linux-mtd/2013-July/047515.html Anyway, the problem is that nand_set_defaults() is called twice, we intend it to reset the chip functions to their x16 buswidth verions if the buswidth changed from x8 to x16; however, nand_set_defaults() does exactly nothing if called a second time. Fix this by hacking nand_set_defaults() to reset the buswidth-dependent functions if they were set to the x8 version the first time. Note that this does not do anything to reset from x16 to x8, but that's not the supported use case for NAND_BUSWIDTH_AUTO anyway. Signed-off-by:
Brian Norris <computersforpeace@gmail.com> Reported-by:
Alexander Shiyan <shc_work@mail.ru> Tested-by:
Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by:
David Woodhouse <David.Woodhouse@intel.com> Signed-off-by:
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Grant Likely authored
commit 0640332e upstream. Any calls to dt_alloc() need to be zeroed. This is a temporary fix, but the allocation function itself needs to zero memory before returning it. This is a follow up to patch 9e401275, "of: fdt: fix memory initialization for expanded DT" which fixed one call site but missed another. Signed-off-by:
Grant Likely <grant.likely@linaro.org> Acked-by:
Wladislav Wiebe <wladislav.kw@gmail.com> Signed-off-by:
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Sergei Shtylyov authored
commit f936f9b6 upstream. I'm testing SH-Mobile SDHI driver in DMA mode with a new DMA controller using 'bonnie++' and getting DMA error after which the tmio_mmc_dma.c code falls back to PIO but all commands time out after that. It turned out that the fallback code calls tmio_mmc_enable_dma() with RX/TX channels already freed and pointers to them cleared, so that the function bails out early instead of clearing the DMA bit in the CTL_DMA_ENABLE register. The regression was introduced by commit 162f43e3 (mmc: tmio: fix a deadlock). Moving tmio_mmc_enable_dma() calls to the top of the PIO fallback code in tmio_mmc_start_dma_{rx|tx}() helps. Signed-off-by:
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Acked-by:
Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by:
Chris Ball <cjb@laptop.org> Signed-off-by:
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Josh Durgin authored
commit 17c1cc1d upstream. When a request returns an error, the driver needs to report the entire extent of the request as completed. Writes already did this, since they always set xferred = length, but reads were skipping that step if an error other than -ENOENT occurred. Instead, rbd would end up passing 0 xferred to blk_end_request(), which would always report needing more data. This resulted in an assert failing when more data was required by the block layer, but all the object requests were done: [ 1868.719077] rbd: obj_request read result -108 xferred 0 [ 1868.719077] [ 1868.719518] end_request: I/O error, dev rbd1, sector 0 [ 1868.719739] [ 1868.719739] Assertion failure in rbd_img_obj_callback() at line 1736: [ 1868.719739] [ 1868.719739] rbd_assert(more ^ (which == img_request->obj_request_count)); Without this assert, reads that hit errors would hang forever, since the block layer considered them incomplete. Fixes: http://tracker.ceph.com/issues/5647Signed-off-by:
Josh Durgin <josh.durgin@inktank.com> Reviewed-by:
Alex Elder <alex.elder@linaro.org> Signed-off-by:
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majianpeng authored
commit 494ddd11 upstream. Signed-off-by:
Jianpeng Ma <majianpeng@gmail.com> Reviewed-by:
Sage Weil <sage@inktank.com> Signed-off-by:
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Sage Weil authored
commit 9542cf0b upstream. Fix a typo that used the wrong bitmask for the pg.seed calculation. This is normally unnoticed because in most cases pg_num == pgp_num. It is, however, a bug that is easily corrected. Signed-off-by:
Alex Elder <alex.elder@linary.org> Signed-off-by:
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majianpeng authored
commit 73d9f7ee upstream. For nofail == false request, if __map_request failed, the caller does cleanup work, like releasing the relative pages. It doesn't make any sense to retry this request. Signed-off-by:
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Richard Weinberger authored
commit f75b1b1b upstream. UML needs it's own probe_kernel_read() to handle kernel mode faults correctly. The implementation uses mincore() on the host side to detect whether a page is owned by the UML kernel process. This fixes also a possible crash when sysrq-t is used. Starting with 3.10 sysrq-t calls probe_kernel_read() to read details from the kernel workers. As kernel worker are completely async pointers may turn NULL while reading them. Signed-off-by:
Richard Weinberger <richard@nod.at> Cc: <stian@nixia.no> Cc: <tj@kernel.org> Signed-off-by:
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Alex Deucher authored
commit 118bdbd8 upstream. This LCD monitor (1280x1024 native) has a completely bogus detailed timing (640x350@70hz). User reports that 1280x1024@60 has waves so prefer 1280x1024@75. Manufacturer: MED Model: 7b8 Serial#: 99188 Year: 2005 Week: 5 EDID Version: 1.3 Analog Display Input, Input Voltage Level: 0.700/0.700 V Sync: Separate Max Image Size [cm]: horiz.: 34 vert.: 27 Gamma: 2.50 DPMS capabilities: Off; RGB/Color Display First detailed timing is preferred mode redX: 0.645 redY: 0.348 greenX: 0.280 greenY: 0.605 blueX: 0.142 blueY: 0.071 whiteX: 0.313 whiteY: 0.329 Supported established timings: 720x400@70Hz 640x480@60Hz 640x480@72Hz 640x480@75Hz 800x600@56Hz 800x600@60Hz 800x600@72Hz 800x600@75Hz 1024x768@60Hz 1024x768@70Hz 1024x768@75Hz 1280x1024@75Hz Manufacturer's mask: 0 Supported standard timings: Supported detailed timing: clock: 25.2 MHz Image Size: 337 x 270 mm h_active: 640 h_sync: 688 h_sync_end 784 h_blank_end 800 h_border: 0 v_active: 350 v_sync: 350 v_sync_end 352 v_blanking: 449 v_border: 0 Monitor name: MD30217PG Ranges: V min: 56 V max: 76 Hz, H min: 30 H max: 83 kHz, PixClock max 145 MHz Serial No: 501099188 EDID (in hex): 00ffffffffffff0034a4b80774830100 050f010368221b962a0c55a559479b24 125054afcf00310a0101010101018180 000000000000d60980a0205e63103060 0200510e1100001e000000fc004d4433 3032313750470a202020000000fd0038 4c1e530e000a202020202020000000ff 003530313039393138380a2020200078 Signed-off-by:
Alex Deucher <alexander.deucher@amd.com> Reported-by: friedrich@mailstation.de Signed-off-by:
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Borislav Petkov authored
commit f0a56c48 upstream. It can happen that configurations are running in a single-channel mode even with a dual-channel memory controller, by, say, putting the DIMMs only on the one channel and leaving the other empty. This causes a problem in init_csrows which implicitly assumes that when the second channel is enabled, i.e. channel 1, the struct dimm hierarchy will be present. Which is not. So always allocate two channels unconditionally. This provides for the nice side effect that the data structures are initialized so some day, when memory hotplug is supported, it should just work out of the box when all of a sudden a second channel appears. Reported-and-tested-by:
Roger Leigh <rleigh@debian.org> Signed-off-by:
Borislav Petkov <bp@suse.de> Signed-off-by:
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Jan Kara authored
commit 17b7f7cf upstream. Refuse RW mount of isofs filesystem. So far we just silently changed it to RO mount but when the media is writeable, block layer won't notice this change and thus will think device is used RW and will block eject button of the drive. That is unexpected by users because for non-writeable media eject button works just fine. Userspace mount(8) command handles this just fine and retries mounting with MS_RDONLY set so userspace shouldn't see any regression. Plus any tool mounting isofs is likely confronted with the case of read-only media where block layer already refuses to mount the filesystem without MS_RDONLY set so our behavior shouldn't be anything new for it. Reported-by:
Hui Wang <hui.wang@canonical.com> Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Eric W. Biederman authored
commit aee1c13d upstream. Don't allow mounting the proc filesystem unless the caller has CAP_SYS_ADMIN rights over the pid namespace. The principle here is if you create or have capabilities over it you can mount it, otherwise you get to live with what other people have mounted. Andy pointed out that this is needed to prevent users in a user namespace from remounting proc and specifying different hidepid and gid options on already existing proc mounts. Reported-by:
Andy Lutomirski <luto@amacapital.net> Signed-off-by:
"Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by:
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Libin authored
commit a8f531eb upstream. In collapse_huge_page() there is a race window between releasing the mmap_sem read lock and taking the mmap_sem write lock, so find_vma() may return NULL. So check the return value to avoid NULL pointer dereference. collapse_huge_page khugepaged_alloc_page up_read(&mm->mmap_sem) down_write(&mm->mmap_sem) vma = find_vma(mm, address) Signed-off-by:
Libin <huawei.libin@huawei.com> Acked-by:
Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by:
Wanpeng Li <liwanp@linux.vnet.ibm.com> Reviewed-by:
Michal Hocko <mhocko@suse.cz> 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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