/* * Copyright © 2016 Collabora Ltd. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #ifndef __DRM_DEBUGFS_CRC_H__ #define __DRM_DEBUGFS_CRC_H__ #define DRM_MAX_CRC_NR 10 /** * struct drm_crtc_crc_entry - entry describing a frame's content * @has_frame_counter: whether the source was able to provide a frame number * @frame: number of the frame this CRC is about, if @has_frame_counter is true * @crc: array of values that characterize the frame */ struct drm_crtc_crc_entry { bool has_frame_counter; uint32_t frame; uint32_t crcs[DRM_MAX_CRC_NR]; }; #define DRM_CRC_ENTRIES_NR 128 /** * struct drm_crtc_crc - data supporting CRC capture on a given CRTC * @lock: protects the fields in this struct * @source: name of the currently configured source of CRCs * @opened: whether userspace has opened the data file for reading * @entries: array of entries, with size of %DRM_CRC_ENTRIES_NR * @head: head of circular queue * @tail: tail of circular queue * @values_cnt: number of CRC values per entry, up to %DRM_MAX_CRC_NR * @wq: workqueue used to synchronize reading and writing */ struct drm_crtc_crc { spinlock_t lock; const char *source; bool opened; struct drm_crtc_crc_entry *entries; int head, tail; size_t values_cnt; wait_queue_head_t wq; }; #if defined(CONFIG_DEBUG_FS) int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame, uint32_t frame, uint32_t *crcs); #else static inline int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame, uint32_t frame, uint32_t *crcs) { return -EINVAL; } #endif /* defined(CONFIG_DEBUG_FS) */ #endif /* __DRM_DEBUGFS_CRC_H__ */ 8c8d3fb6499e3dfaeb0949241ab588'>root/net/dns_resolver
diff options
context:
space:
mode:
authorPeter Zijlstra <peterz@infradead.org>2017-01-26 16:39:55 +0100
committerIngo Molnar <mingo@kernel.org>2017-01-30 11:41:25 +0100
commita76a82a3e38c8d3fb6499e3dfaeb0949241ab588 (patch)
treeb5bc906278fe1ac66d75de984d26bf59b43b3ed8 /net/dns_resolver
parent566cf877a1fcb6d6dc0126b076aad062054c2637 (diff)
perf/core: Fix use-after-free bug
Dmitry reported a KASAN use-after-free on event->group_leader. It turns out there's a hole in perf_remove_from_context() due to event_function_call() not calling its function when the task associated with the event is already dead. In this case the event will have been detached from the task, but the grouping will have been retained, such that group operations might still work properly while there are live child events etc. This does however mean that we can miss a perf_group_detach() call when the group decomposes, this in turn can then lead to use-after-free. Fix it by explicitly doing the group detach if its still required. Reported-by: Dmitry Vyukov <dvyukov@google.com> Tested-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org # v4.5+ Cc: syzkaller <syzkaller@googlegroups.com> Fixes: 63b6da39bb38 ("perf: Fix perf_event_exit_task() race") Link: http://lkml.kernel.org/r/20170126153955.GD6515@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/dns_resolver')