- 02 Nov, 2017 1 commit
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Dave Airlie authored
Merge tag 'drm-intel-fixes-2017-11-01' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes Fixes for Stable: - Fix KBL Blank Screen (Jani) - Fix FIFO Underrun on SNB (Maarten) Other fixes: - Fix GPU Hang on i915gm (Chris) - Fix gem_tiled_pread_pwrite IGT case (Chris) - Cancel modeset retry work during modeset clean-up (Manasi) * tag 'drm-intel-fixes-2017-11-01' of git://anongit.freedesktop.org/drm/drm-intel: drm/i915: Check incoming alignment for unfenced buffers (on i915gm) drm/i915: Hold rcu_read_lock when iterating over the radixtree (vma idr) drm/i915: Hold rcu_read_lock when iterating over the radixtree (objects) drm/i915/edp: read edp display control registers unconditionally drm/i915: Do not rely on wm preservation for ILK watermarks drm/i915: Cancel the modeset retry work during modeset cleanup
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- 01 Nov, 2017 2 commits
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Chris Wilson authored
In case the object has changed tiling between calls to execbuf, we need to check if the existing offset inside the GTT matches the new tiling constraint. We even need to do this for "unfenced" tiled objects, where the 3D commands use an implied fence and so the object still needs to match the physical fence restrictions on alignment (only required for gen2 and early gen3). In commit 2889caa9 ("drm/i915: Eliminate lots of iterations over the execobjects array"), the idea was to remove the second guessing and only set the NEEDS_MAP flag when required. However, the entire check for an unusable offset for fencing was removed and not just the secondary check. I.e. /* avoid costly ping-pong once a batch bo ended up non-mappable */ if (entry->flags & __EXEC_OBJECT_NEEDS_MAP && !i915_vma_is_map_and_fenceable(vma)) return !only_mappable_for_reloc(entry->flags); was entirely removed as the ping-pong between execbuf passes was fixed, but its primary purpose in forcing unaligned unfenced access to be rebound was forgotten. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103502 Fixes: 2889caa9 ("drm/i915: Eliminate lots of iterations over the execobjects array") Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171031103607.17836-1-chris@chris-wilson.co.ukReviewed-by:
Joonas Lahtinen <joonas.lahtinen@linux.intel.com> (cherry picked from commit 1d033beb) Signed-off-by:
Rodrigo Vivi <rodrigo.vivi@intel.com>
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git://github.com/skeggsb/linuxDave Airlie authored
single nouveau regression fix. * 'linux-4.14' of git://github.com/skeggsb/linux: drm/nouveau/kms/nv50: use the correct state for base channel notifier setup
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- 31 Oct, 2017 1 commit
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Ben Skeggs authored
Fixes: 857263 ("drm/nouveau: Handle drm_atomic_helper_swap_state failure") Signed-off-by:Ben Skeggs <bskeggs@redhat.com> Tested-by:
Lyude Paul <lyude@redhat.com> Reviewed by: Lyude Paul <lyude@redhat.com>
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- 30 Oct, 2017 5 commits
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Chris Wilson authored
Kasan spotted [IGT] gem_tiled_pread_pwrite: exiting, ret=0 ================================================================== BUG: KASAN: use-after-free in __i915_gem_object_reset_page_iter+0x15c/0x170 [i915] Read of size 8 at addr ffff8801359da310 by task kworker/3:2/182 CPU: 3 PID: 182 Comm: kworker/3:2 Tainted: G U 4.14.0-rc6-CI-Custom_3340+ #1 Hardware name: Intel Corp. Geminilake/GLK RVP1 DDR4 (05), BIOS GELKRVPA.X64.0062.B30.1708222146 08/22/2017 Workqueue: events __i915_gem_free_work [i915] Call Trace: dump_stack+0x68/0xa0 print_address_description+0x78/0x290 ? __i915_gem_object_reset_page_iter+0x15c/0x170 [i915] kasan_report+0x23d/0x350 __asan_report_load8_noabort+0x19/0x20 __i915_gem_object_reset_page_iter+0x15c/0x170 [i915] ? i915_gem_object_truncate+0x100/0x100 [i915] ? lock_acquire+0x380/0x380 __i915_gem_object_put_pages+0x30d/0x530 [i915] __i915_gem_free_objects+0x551/0xbd0 [i915] ? lock_acquire+0x13e/0x380 __i915_gem_free_work+0x4e/0x70 [i915] process_one_work+0x6f6/0x1590 ? pwq_dec_nr_in_flight+0x2b0/0x2b0 worker_thread+0xe6/0xe90 ? pci_mmcfg_check_reserved+0x110/0x110 kthread+0x309/0x410 ? process_one_work+0x1590/0x1590 ? kthread_create_on_node+0xb0/0xb0 ret_from_fork+0x27/0x40 Allocated by task 1801: save_stack_trace+0x1b/0x20 kasan_kmalloc+0xee/0x190 kasan_slab_alloc+0x12/0x20 kmem_cache_alloc+0xdc/0x2e0 radix_tree_node_alloc.constprop.12+0x48/0x330 __radix_tree_create+0x274/0x480 __radix_tree_insert+0xa2/0x610 i915_gem_object_get_sg+0x224/0x670 [i915] i915_gem_object_get_page+0xb5/0x1c0 [i915] i915_gem_pread_ioctl+0x822/0xf60 [i915] drm_ioctl_kernel+0x13f/0x1c0 drm_ioctl+0x6cf/0x980 do_vfs_ioctl+0x184/0xf30 SyS_ioctl+0x41/0x70 entry_SYSCALL_64_fastpath+0x1c/0xb1 Freed by task 37: save_stack_trace+0x1b/0x20 kasan_slab_free+0xaf/0x190 kmem_cache_free+0xbf/0x340 radix_tree_node_rcu_free+0x79/0x90 rcu_process_callbacks+0x46d/0xf40 __do_softirq+0x21c/0x8d3 The buggy address belongs to the object at ffff8801359da0f0 which belongs to the cache radix_tree_node of size 576 The buggy address is located 544 bytes inside of 576-byte region [ffff8801359da0f0, ffff8801359da330) The buggy address belongs to the page: page:ffffea0004d67600 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 flags: 0x8000000000008100(slab|head) raw: 8000000000008100 0000000000000000 0000000000000000 0000000100110011 raw: ffffea0004b52920 ffffea0004b38020 ffff88015b416a80 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801359da200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801359da280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801359da300: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ^ ffff8801359da380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801359da400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== Disabling lock debugging due to kernel taint which looks like the slab containing the radixtree iter was freed as we traversed the tree, taking the rcu read lock across the loop should prevent that (deferring all the frees until the end). Reported-by:Tomi Sarvela <tomi.p.sarvela@intel.com> Fixes: d1b48c1e ("drm/i915: Replace execbuf vma ht with an idr") Signed-off-by:
Matthew Auld <matthew.william.auld@gmail.com> (cherry picked from commit 547da76b) Signed-off-by:
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Chris Wilson authored
Kasan spotted [IGT] gem_tiled_pread_pwrite: exiting, ret=0 ================================================================== BUG: KASAN: use-after-free in __i915_gem_object_reset_page_iter+0x15c/0x170 [i915] Read of size 8 at addr ffff8801359da310 by task kworker/3:2/182 CPU: 3 PID: 182 Comm: kworker/3:2 Tainted: G U 4.14.0-rc6-CI-Custom_3340+ #1 Hardware name: Intel Corp. Geminilake/GLK RVP1 DDR4 (05), BIOS GELKRVPA.X64.0062.B30.1708222146 08/22/2017 Workqueue: events __i915_gem_free_work [i915] Call Trace: dump_stack+0x68/0xa0 print_address_description+0x78/0x290 ? __i915_gem_object_reset_page_iter+0x15c/0x170 [i915] kasan_report+0x23d/0x350 __asan_report_load8_noabort+0x19/0x20 __i915_gem_object_reset_page_iter+0x15c/0x170 [i915] ? i915_gem_object_truncate+0x100/0x100 [i915] ? lock_acquire+0x380/0x380 __i915_gem_object_put_pages+0x30d/0x530 [i915] __i915_gem_free_objects+0x551/0xbd0 [i915] ? lock_acquire+0x13e/0x380 __i915_gem_free_work+0x4e/0x70 [i915] process_one_work+0x6f6/0x1590 ? pwq_dec_nr_in_flight+0x2b0/0x2b0 worker_thread+0xe6/0xe90 ? pci_mmcfg_check_reserved+0x110/0x110 kthread+0x309/0x410 ? process_one_work+0x1590/0x1590 ? kthread_create_on_node+0xb0/0xb0 ret_from_fork+0x27/0x40 Allocated by task 1801: save_stack_trace+0x1b/0x20 kasan_kmalloc+0xee/0x190 kasan_slab_alloc+0x12/0x20 kmem_cache_alloc+0xdc/0x2e0 radix_tree_node_alloc.constprop.12+0x48/0x330 __radix_tree_create+0x274/0x480 __radix_tree_insert+0xa2/0x610 i915_gem_object_get_sg+0x224/0x670 [i915] i915_gem_object_get_page+0xb5/0x1c0 [i915] i915_gem_pread_ioctl+0x822/0xf60 [i915] drm_ioctl_kernel+0x13f/0x1c0 drm_ioctl+0x6cf/0x980 do_vfs_ioctl+0x184/0xf30 SyS_ioctl+0x41/0x70 entry_SYSCALL_64_fastpath+0x1c/0xb1 Freed by task 37: save_stack_trace+0x1b/0x20 kasan_slab_free+0xaf/0x190 kmem_cache_free+0xbf/0x340 radix_tree_node_rcu_free+0x79/0x90 rcu_process_callbacks+0x46d/0xf40 __do_softirq+0x21c/0x8d3 The buggy address belongs to the object at ffff8801359da0f0 which belongs to the cache radix_tree_node of size 576 The buggy address is located 544 bytes inside of 576-byte region [ffff8801359da0f0, ffff8801359da330) The buggy address belongs to the page: page:ffffea0004d67600 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 flags: 0x8000000000008100(slab|head) raw: 8000000000008100 0000000000000000 0000000000000000 0000000100110011 raw: ffffea0004b52920 ffffea0004b38020 ffff88015b416a80 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801359da200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801359da280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801359da300: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ^ ffff8801359da380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801359da400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== Disabling lock debugging due to kernel taint which looks like the slab containing the radixtree iter was freed as we traversed the tree, taking the rcu read lock across the loop should prevent that (deferring all the frees until the end). Reported-by: -
Jani Nikula authored
Per my reading of the eDP spec, DP_DPCD_DISPLAY_CONTROL_CAPABLE bit in DP_EDP_CONFIGURATION_CAP should be set if the eDP display control registers starting at offset DP_EDP_DPCD_REV are "enabled". Currently we check the bit before reading the registers, and DP_EDP_DPCD_REV is the only way to detect eDP revision. Turns out there are (likely buggy) displays that require eDP 1.4+ features, such as supported link rates and link rate select, but do not have the bit set. Read the display control registers unconditionally. They are supposed to read zero anyway if they are not supported, so there should be no harm in this. This fixes the referenced bug by enabling the eDP version check, and thus reading of the supported link rates. The panel in question has 0 in DP_MAX_LINK_RATE which is only supported in eDP 1.4+. Without the supported link rates method we default to RBR which is insufficient for the panel native mode. As a curiosity, the panel also has a bogus value of 0x12 in DP_EDP_DPCD_REV, but that passes our check for >= DP_EDP_14 (which is 0x03). Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103400Reported-and-tested-by:
Nicolas P. <issun.artiste@gmail.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: stable@vger.kernel.org Reviewed-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by:
Manasi Navare <manasi.d.navare@intel.com> Signed-off-by:
Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171026142932.17737-1-jani.nikula@intel.com (cherry picked from commit 0501a3b0) Signed-off-by:
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Maarten Lankhorst authored
The original intent was to preserve watermarks as much as possible in intel_pipe_wm.raw_wm, and put the validated ones in intel_pipe_wm.wm. It seems this approach is insufficient and we don't always preserve the raw watermarks, so just use the atomic iterator we're already using to get a const pointer to all bound planes on the crtc. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102373Signed-off-by:
Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: stable@vger.kernel.org #v4.8+ Acked-by:
Matt Roper <matthew.d.roper@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171019151341.4579-1-maarten.lankhorst@linux.intel.com (cherry picked from commit 28283f4f) Signed-off-by:
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Manasi Navare authored
During modeset cleanup on driver unload we may have a pending hotplug work. This needs to be canceled early during the teardown so that it does not fire after we have freed the connector. We do this after drm_kms_helper_poll_fini(dev) since this might trigger modeset retry work due to link retrain and before intel_fbdev_fini() since this work requires the lock from fbdev. If this is not done we may see something like: DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock)) ------------[ cut here ]------------ WARNING: CPU: 4 PID: 5010 at kernel/locking/mutex-debug.c:103 mutex_destroy+0x4e/0x60 Modules linked in: i915(-) snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec snd_hwdep snd_hda_core snd_pcm vgem ax88179_178 +a usbnet mii x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel e1000e ptp pps_core prime_numbers i2c_hid +[last unloaded: snd_hda_intel] CPU: 4 PID: 5010 Comm: drv_module_relo Tainted: G U 4.14.0-rc3-CI-CI_DRM_3186+ #1 Hardware name: Intel Corporation CoffeeLake Client Platform/CoffeeLake S UDIMM RVP, BIOS CNLSFWX1.R00.X104.A03.1709140524 09/14/2017 task: ffff8803c827aa40 task.stack: ffffc90000520000 RIP: 0010:mutex_destroy+0x4e/0x60 RSP: 0018:ffffc90000523d58 EFLAGS: 00010292 RAX: 000000000000002a RBX: ffff88044fbef648 RCX: 0000000000000000 RDX: 0000000080000001 RSI: 0000000000000001 RDI: ffffffff810f0cf0 RBP: ffffc90000523d60 R08: 0000000000000001 R09: 0000000000000001 R10: 000000000f21cb81 R11: 0000000000000000 R12: ffff88044f71efc8 R13: ffffffffa02b3d20 R14: ffffffffa02b3d90 R15: ffff880459b29308 FS: 00007f5df4d6e8c0(0000) GS:ffff88045d300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ec51f00a18 CR3: 0000000451782006 CR4: 00000000003606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: drm_fb_helper_fini+0xd9/0x130 intel_fbdev_destroy+0x12/0x60 [i915] intel_fbdev_fini+0x28/0x30 [i915] intel_modeset_cleanup+0x45/0xa0 [i915] i915_driver_unload+0x92/0x180 [i915] i915_pci_remove+0x19/0x30 [i915] i915_driver_unload+0x92/0x180 [i915] i915_pci_remove+0x19/0x30 [i915] pci_device_remove+0x39/0xb0 device_release_driver_internal+0x15d/0x220 driver_detach+0x40/0x80 bus_remove_driver+0x58/0xd0 driver_unregister+0x2c/0x40 pci_unregister_driver+0x36/0xb0 i915_exit+0x1a/0x8b [i915] SyS_delete_module+0x18c/0x1e0 entry_SYSCALL_64_fastpath+0x1c/0xb1 RIP: 0033:0x7f5df3286287 RSP: 002b:00007fff8e107cc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000b0 RAX: ffffffffffffffda RBX: ffffffff81493a03 RCX: 00007f5df3286287 RDX: 0000000000000001 RSI: 0000000000000800 RDI: 0000564c7be02e48 RBP: ffffc90000523f88 R08: 0000000000000000 R09: 0000000000000080 R10: 00007f5df4d6e8c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff8e107eb0 R14: 0000000000000000 R15: 0000000000000000 Or a GPF like: general protection fault: 0000 [#1] PREEMPT SMP Modules linked in: i915(-) snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec snd_hwdep snd_hda_core snd_pcm vgem ax88179_178 +a usbnet mii x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel e1000e ptp pps_core prime_numbers i2c_hid +[last unloaded: snd_hda_intel] CPU: 0 PID: 82 Comm: kworker/0:1 Tainted: G U W 4.14.0-rc3-CI-CI_DRM_3186+ #1 Hardware name: Intel Corporation CoffeeLake Client Platform/CoffeeLake S UDIMM RVP, BIOS CNLSFWX1.R00.X104.A03.1709140524 09/14/2017 Workqueue: events intel_dp_modeset_retry_work_fn [i915] task: ffff88045a5caa40 task.stack: ffffc90000378000 RIP: 0010:drm_setup_crtcs+0x143/0xbf0 RSP: 0018:ffffc9000037bd20 EFLAGS: 00010202 RAX: 6b6b6b6b6b6b6b6b RBX: 0000000000000002 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000780 RDI: 00000000ffffffff RBP: ffffc9000037bdb8 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000780 R11: 0000000000000000 R12: 0000000000000002 R13: ffff88044fbef4e8 R14: 0000000000000780 R15: 0000000000000438 FS: 0000000000000000(0000) GS:ffff88045d200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ec51ee5168 CR3: 000000044c89d003 CR4: 00000000003606f0 Call Trace: drm_fb_helper_hotplug_event.part.18+0x7e/0xc0 drm_fb_helper_hotplug_event+0x1a/0x20 intel_fbdev_output_poll_changed+0x1a/0x20 [i915] drm_kms_helper_hotplug_event+0x27/0x30 intel_dp_modeset_retry_work_fn+0x77/0x80 [i915] process_one_work+0x233/0x660 worker_thread+0x206/0x3b0 kthread+0x152/0x190 ? process_one_work+0x660/0x660 ? kthread_create_on_node+0x40/0x40 ret_from_fork+0x27/0x40 Code: 06 00 00 45 8b 45 20 31 db 45 31 e4 45 85 c0 0f 8e 91 06 00 00 44 8b 75 94 44 8b 7d 90 49 8b 45 28 49 63 d4 44 89 f6 41 83 c4 01 <48> 8b 04 d0 44 +89 fa 48 8b 38 48 8b 87 a8 01 00 00 ff 50 20 01 RIP: drm_setup_crtcs+0x143/0xbf0 RSP: ffffc9000037bd20 ---[ end trace 08901ff1a77d30c7 ]--- v2: * Rename it to intel_hpd_poll_fini() and call drm_kms_helper_fini() inside it as the first step before cancel work (Chris Wilson) * Add GPF trace in commit message and make the function static (Maarten Lankhorst) Suggested-by:
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- 29 Oct, 2017 29 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds authored
Pull networking fixes from David Miller: 1) Fix route leak in xfrm_bundle_create(). 2) In mac80211, validate user rate mask before configuring it. From Johannes Berg. 3) Properly enforce memory limits in fair queueing code, from Toke Hoiland-Jorgensen. 4) Fix lockdep splat in inet_csk_route_req(), from Eric Dumazet. 5) Fix TSO header allocation and management in mvpp2 driver, from Yan Markman. 6) Don't take socket lock in BH handler in strparser code, from Tom Herbert. 7) Don't show sockets from other namespaces in AF_UNIX code, from Andrei Vagin. 8) Fix double free in error path of tap_open(), from Girish Moodalbail. 9) Fix TX map failure path in igb and ixgbe, from Jean-Philippe Brucker and Alexander Duyck. 10) Fix DCB mode programming in stmmac driver, from Jose Abreu. 11) Fix err_count handling in various tunnels (ipip, ip6_gre). From Xin Long. 12) Properly align SKB head before building SKB in tuntap, from Jason Wang. 13) Avoid matching qdiscs with a zero handle during lookups, from Cong Wang. 14) Fix various endianness bugs in sctp, from Xin Long. 15) Fix tc filter callback races and add selftests which trigger the problem, from Cong Wang. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (73 commits) selftests: Introduce a new test case to tc testsuite selftests: Introduce a new script to generate tc batch file net_sched: fix call_rcu() race on act_sample module removal net_sched: add rtnl assertion to tcf_exts_destroy() net_sched: use tcf_queue_work() in tcindex filter net_sched: use tcf_queue_work() in rsvp filter net_sched: use tcf_queue_work() in route filter net_sched: use tcf_queue_work() in u32 filter net_sched: use tcf_queue_work() in matchall filter net_sched: use tcf_queue_work() in fw filter net_sched: use tcf_queue_work() in flower filter net_sched: use tcf_queue_work() in flow filter net_sched: use tcf_queue_work() in cgroup filter net_sched: use tcf_queue_work() in bpf filter net_sched: use tcf_queue_work() in basic filter net_sched: introduce a workqueue for RCU callbacks of tc filter sctp: fix some type cast warnings introduced since very beginning sctp: fix a type cast warnings that causes a_rwnd gets the wrong value sctp: fix some type cast warnings introduced by transport rhashtable sctp: fix some type cast warnings introduced by stream reconf ... -
David S. Miller authored
Cong Wang says: ==================== net_sched: fix races with RCU callbacks Recently, the RCU callbacks used in TC filters and TC actions keep drawing my attention, they introduce at least 4 race condition bugs: 1. A simple one fixed by Daniel: commit c78e1746 Author: Daniel Borkmann <daniel@iogearbox.net> Date: Wed May 20 17:13:33 2015 +0200 net: sched: fix call_rcu() race on classifier module unloads 2. A very nasty one fixed by me: commit 1697c4bb Author: Cong Wang <xiyou.wangcong@gmail.com> Date: Mon Sep 11 16:33:32 2017 -0700 net_sched: carefully handle tcf_block_put() 3. Two more bugs found by Chris: https://patchwork.ozlabs.org/patch/826696/ https://patchwork.ozlabs.org/patch/826695/ Usually RCU callbacks are simple, however for TC filters and actions, they are complex because at least TC actions could be destroyed together with the TC filter in one callback. And RCU callbacks are invoked in BH context, without locking they are parallel too. All of these contribute to the cause of these nasty bugs. Alternatively, we could also: a) Introduce a spinlock to serialize these RCU callbacks. But as I said in commit 1697c4bb ("net_sched: carefully handle tcf_block_put()"), it is very hard to do because of tcf_chain_dump(). Potentially we need to do a lot of work to make it possible (if not impossible). b) Just get rid of these RCU callbacks, because they are not necessary at all, callers of these call_rcu() are all on slow paths and holding RTNL lock, so blocking is allowed in their contexts. However, David and Eric dislike adding synchronize_rcu() here. As suggested by Paul, we could defer the work to a workqueue and gain the permission of holding RTNL again without any performance impact, however, in tcf_block_put() we could have a deadlock when flushing workqueue while hodling RTNL lock, the trick here is to defer the work itself in workqueue and make it queued after all other works so that we keep the same ordering to avoid any use-after-free. Please see the first patch for details. Patch 1 introduces the infrastructure, patch 2~12 move each tc filter to the new tc filter workqueue, patch 13 adds an assertion to catch potential bugs like this, patch 14 closes another rcu callback race, patch 15 and patch 16 add new test cases. ==================== Reported-by:
Chris Mi <chrism@mellanox.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Jiri Pirko <jiri@resnulli.us> Cc: John Fastabend <john.fastabend@gmail.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Signed-off-by:
Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Chris Mi authored
In this patchset, we fixed a tc bug. This patch adds the test case that reproduces the bug. To run this test case, user should specify an existing NIC device: # sudo ./tdc.py -d enp4s0f0 This test case belongs to category "flower". If user doesn't specify a NIC device, the test cases belong to "flower" will not be run. In this test case, we create 1M filters and all filters share the same action. When destroying all filters, kernel should not panic. It takes about 18s to run it. Acked-by:
Jamal Hadi Salim <jhs@mojatatu.com> Acked-by:
Lucas Bates <lucasb@mojatatu.com> Signed-off-by:
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Chris Mi authored
# ./tdc_batch.py -h usage: tdc_batch.py [-h] [-n NUMBER] [-o] [-s] [-p] device file TC batch file generator positional arguments: device device name file batch file name optional arguments: -h, --help show this help message and exit -n NUMBER, --number NUMBER how many lines in batch file -o, --skip_sw skip_sw (offload), by default skip_hw -s, --share_action all filters share the same action -p, --prio all filters have different prio Acked-by: -
Cong Wang authored
Similar to commit c78e1746 ("net: sched: fix call_rcu() race on classifier module unloads"), we need to wait for flying RCU callback tcf_sample_cleanup_rcu(). Cc: Yotam Gigi <yotamg@mellanox.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Jiri Pirko <jiri@resnulli.us> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Signed-off-by:
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Cong Wang authored
After previous patches, it is now safe to claim that tcf_exts_destroy() is always called with RTNL lock. Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Jiri Pirko <jiri@resnulli.us> Cc: John Fastabend <john.fastabend@gmail.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Signed-off-by:
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Cong Wang authored
Defer the tcf_exts_destroy() in RCU callback to tc filter workqueue and get RTNL lock. Reported-by:
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Cong Wang authored
Defer the tcf_exts_destroy() in RCU callback to tc filter workqueue and get RTNL lock. Reported-by:
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Cong Wang authored
Defer the tcf_exts_destroy() in RCU callback to tc filter workqueue and get RTNL lock. Reported-by:
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Cong Wang authored
Defer the tcf_exts_destroy() in RCU callback to tc filter workqueue and get RTNL lock. Reported-by:
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Cong Wang authored
Defer the tcf_exts_destroy() in RCU callback to tc filter workqueue and get RTNL lock. Reported-by:
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Cong Wang authored
Defer the tcf_exts_destroy() in RCU callback to tc filter workqueue and get RTNL lock. Reported-by:
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Cong Wang authored
Defer the tcf_exts_destroy() in RCU callback to tc filter workqueue and get RTNL lock. Reported-by:
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Cong Wang authored
Defer the tcf_exts_destroy() in RCU callback to tc filter workqueue and get RTNL lock. Reported-by:
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Cong Wang authored
Defer the tcf_exts_destroy() in RCU callback to tc filter workqueue and get RTNL lock. Reported-by:
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Cong Wang authored
Defer the tcf_exts_destroy() in RCU callback to tc filter workqueue and get RTNL lock. Reported-by:
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Cong Wang authored
Defer the tcf_exts_destroy() in RCU callback to tc filter workqueue and get RTNL lock. Reported-by:
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Cong Wang authored
This patch introduces a dedicated workqueue for tc filters so that each tc filter's RCU callback could defer their action destroy work to this workqueue. The helper tcf_queue_work() is introduced for them to use. Because we hold RTNL lock when calling tcf_block_put(), we can not simply flush works inside it, therefore we have to defer it again to this workqueue and make sure all flying RCU callbacks have already queued their work before this one, in other words, to ensure this is the last one to execute to prevent any use-after-free. On the other hand, this makes tcf_block_put() ugly and harder to understand. Since David and Eric strongly dislike adding synchronize_rcu(), this is probably the only solution that could make everyone happy. Please also see the code comments below. Reported-by:
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David S. Miller authored
Xin Long says: ==================== sctp: a bunch of fixes for some sparse warnings As Eric noticed, when running 'make C=2 M=net/sctp/', a plenty of warnings or errors checked by sparse appear. They are all problems about Endian and type cast. Most of them are just warnings by which no issues could be caused while some might be bugs. This patchset fixes them with four patches basically according to how they are introduced. ==================== Signed-off-by: -
Xin Long authored
These warnings were found by running 'make C=2 M=net/sctp/'. They are there since very beginning. Note after this patch, there still one warning left in sctp_outq_flush(): sctp_chunk_fail(chunk, SCTP_ERROR_INV_STRM) Since it has been moved to sctp_stream_outq_migrate on net-next, to avoid the extra job when merging net-next to net, I will post the fix for it after the merging is done. Reported-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
Xin Long <lucien.xin@gmail.com> Signed-off-by:
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Xin Long authored
These warnings were found by running 'make C=2 M=net/sctp/'. Commit d4d6fb57 ("sctp: Try not to change a_rwnd when faking a SACK from SHUTDOWN.") expected to use the peers old rwnd and add our flight size to the a_rwnd. But with the wrong Endian, it may not work as well as expected. So fix it by converting to the right value. Fixes: d4d6fb57 ("sctp: Try not to change a_rwnd when faking a SACK from SHUTDOWN.") Reported-by:
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Xin Long authored
These warnings were found by running 'make C=2 M=net/sctp/'. They are introduced by not aware of Endian for the port when coding transport rhashtable patches. Fixes: 7fda702f ("sctp: use new rhlist interface on sctp transport rhashtable") Reported-by:
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Xin Long authored
These warnings were found by running 'make C=2 M=net/sctp/'. They are introduced by not aware of Endian when coding stream reconf patches. Since commit c0d8bab6 ("sctp: add get and set sockopt for reconf_enable") enabled stream reconf feature for users, the Fixes tag below would use it. Fixes: c0d8bab6 ("sctp: add get and set sockopt for reconf_enable") Reported-by:
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Cong Wang authored
Davide found the following script triggers a NULL pointer dereference: ip l a name eth0 type dummy tc q a dev eth0 parent :1 handle 1: htb This is because for a freshly created netdevice noop_qdisc is attached and when passing 'parent :1', kernel actually tries to match the major handle which is 0 and noop_qdisc has handle 0 so is matched by mistake. Commit 69012ae4 tries to fix a similar bug but still misses this case. Handle 0 is not a valid one, should be just skipped. In fact, kernel uses it as TC_H_UNSPEC. Fixes: 69012ae4 ("net: sched: fix handling of singleton qdiscs with qdisc_hash") Fixes: 59cc1f61 ("net: sched:convert qdisc linked list to hashtable") Reported-by:
Davide Caratti <dcaratti@redhat.com> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Eric Dumazet <edumazet@google.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by:
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Xin Long authored
Now when migrating sock to another one in sctp_sock_migrate(), it only resets owner sk for the data in receive queues, not the chunks on out queues. It would cause that data chunks length on the sock is not consistent with sk sk_wmem_alloc. When closing the sock or freeing these chunks, the old sk would never be freed, and the new sock may crash due to the overflow sk_wmem_alloc. syzbot found this issue with this series: r0 = socket$inet_sctp() sendto$inet(r0) listen(r0) accept4(r0) close(r0) Although listen() should have returned error when one TCP-style socket is in connecting (I may fix this one in another patch), it could also be reproduced by peeling off an assoc. This issue is there since very beginning. This patch is to reset owner sk for the chunks on out queues so that sk sk_wmem_alloc has correct value after accept one sock or peeloff an assoc to one sock. Note that when resetting owner sk for chunks on outqueue, it has to sctp_clear_owner_w/skb_orphan chunks before changing assoc->base.sk first and then sctp_set_owner_w them after changing assoc->base.sk, due to that sctp_wfree and it's callees are using assoc->base.sk. Reported-by:
Dmitry Vyukov <dvyukov@google.com> Signed-off-by:
Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by:
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David S. Miller authored
John Fastabend says: ==================== net: sockmap fixes Last two fixes (as far as I know) for sockmap code this round. First, we are using the qdisc cb structure when making the data end calculation. This is really just wrong so, store it with the other metadata in the correct tcp_skb_cb sturct to avoid breaking things. Next, with recent work to attach multiple programs to a cgroup a specific enumeration of return codes was agreed upon. However, I wrote the sk_skb program types before seeing this work and used a different convention. Patch 2 in the series aligns the return codes to avoid breaking with this infrastructure and also aligns with other programming conventions to avoid being the odd duck out forcing programs to remember SK_SKB programs are different. Pusing to net because its a user visible change. With this SK_SKB program return codes are the same as other cgroup program types. ==================== Signed-off-by: -
John Fastabend authored
Recent additions to support multiple programs in cgroups impose a strict requirement, "all yes is yes, any no is no". To enforce this the infrastructure requires the 'no' return code, SK_DROP in this case, to be 0. To apply these rules to SK_SKB program types the sk_actions return codes need to be adjusted. This fix adds SK_PASS and makes 'SK_DROP = 0'. Finally, remove SK_ABORTED to remove any chance that the API may allow aborted program flows to be passed up the stack. This would be incorrect behavior and allow programs to break existing policies. Signed-off-by:
John Fastabend <john.fastabend@gmail.com> Acked-by:
Alexei Starovoitov <ast@kernel.org> Signed-off-by:
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John Fastabend authored
SK_SKB program types use bpf_compute_data to store the end of the packet data. However, bpf_compute_data assumes the cb is stored in the qdisc layer format. But, for SK_SKB this is the wrong layer of the stack for this type. It happens to work (sort of!) because in most cases nothing happens to be overwritten today. This is very fragile and error prone. Fortunately, we have another hole in tcp_skb_cb we can use so lets put the data_end value there. Note, SK_SKB program types do not use data_meta, they are failed by sk_skb_is_valid_access(). Signed-off-by:
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- 28 Oct, 2017 2 commits
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Linus Torvalds authored
Merge tag 'kbuild-fixes-v4.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kbuild fixes from Masahiro Yamada: - fix O= building on dash - remove unused dependency in Makefile - fix default of a choice in Kconfig - fix typos and documentation style - fix command options unrecognized by sparse * tag 'kbuild-fixes-v4.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: kbuild: clang: fix build failures with sparse check kbuild doc: a bundle of fixes on makefiles.txt Makefile: kselftest: fix grammar typo kbuild: Fix optimization level choice default kbuild: drop unused symverfile in Makefile.modpost kbuild: revert $(realpath ...) to $(shell cd ... && /bin/pwd)
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git://git.kernel.org/pub/scm/linux/kernel/git/dtor/inputLinus Torvalds authored
Pull input fixes from Dmitry Torokhov: - fix gtco tablet driver, tightening parsing of HID descriptors - add ACPI ID added to Elan driver to be able to handle touchpads found in Lenovo Ideapad 320/520 - fix the Symaptics RMI4 driver to adjust handling of buttons * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: synaptics-rmi4 - limit the range of what GPIOs are buttons Input: gtco - fix potential out-of-bound access Input: elan_i2c - add ELAN0611 to the ACPI table
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