Steven Rostedt (VMware) b220c049d5 tracing: Check length before giving out the filter buffer ... When filters are used by trace events, a page is allocated on each CPU and used to copy the trace event fields to this page before writing to the ring buffer. The reason to use the filter and not write directly into the ring buffer is because a filter may discard the event and there's more overhead on discarding from the ring buffer than the extra copy. The problem here is that there is no check against the size being allocated when using this page. If an event asks for more than a page size while being filtered, it will get only a page, leading to the caller writing more that what was allocated. Check the length of the request, and if it is more than PAGE_SIZE minus the header default back to allocating from the ring buffer directly. The ring buffer may reject the event if its too big anyway, but it wont overflow. Link: https://lore.kernel.org/ath10k/1612839593-2308-1-git-send-email-wgong@codeaurora.org/ Cc: stable@vger.kernel.org Fixes: 0fc1b09ff1 ("tracing: Use temp buffer when filtering events") Reported-by: Wen Gong <wgong@codeaurora.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>		2021-02-11 14:23:37 -05:00
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blktrace.c	Tracing updates for 5.11	2020-12-17 13:22:17 -08:00
bpf_trace.c	Tracing updates for 5.11	2020-12-17 13:22:17 -08:00
bpf_trace.h	bpf: Use dedicated bpf_trace_printk event instead of trace_printk()	2020-07-13 16:55:49 -07:00
fgraph.c	fgraph: Initialize tracing_graph_pause at task creation	2021-01-29 15:07:32 -05:00
ftrace_internal.h	x86/ftrace: Have ftrace trampolines turn read-only at the end of system boot up	2020-05-12 18:24:34 -04:00
ftrace.c	Tracing updates for 5.11	2020-12-17 13:22:17 -08:00
Kconfig	tracing/kprobes: Do the notrace functions check without kprobes on ftrace	2021-01-11 16:09:53 -05:00
kprobe_event_gen_test.c	tracing: Add kprobe event command generation test module	2020-01-30 09:46:28 -05:00
Makefile	ftrace: Add recording of functions that caused recursion	2020-11-06 08:42:26 -05:00
power-traces.c
preemptirq_delay_test.c	tracing: Wait for preempt irq delay thread to execute	2020-05-11 17:00:34 -04:00
ring_buffer_benchmark.c	sched,tracing: Convert to sched_set_fifo()	2020-07-29 11:43:53 +02:00
ring_buffer.c	Tracing updates for 5.11	2020-12-17 13:22:17 -08:00
rpm-traces.c
synth_event_gen_test.c	tracing: Remove the useless value assignment in test_create_synth_event()	2020-11-13 12:19:52 -05:00
trace_benchmark.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_benchmark.h
trace_boot.c	tracing: Disable ftrace selftests when any tracer is running	2020-12-14 12:05:03 -05:00
trace_branch.c	tracing: Make struct ring_buffer less ambiguous	2020-01-13 13:19:38 -05:00
trace_clock.c
trace_dynevent.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_dynevent.h	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_entries.h	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_event_perf.c	ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs	2020-11-13 12:14:55 -05:00
trace_events_filter_test.h
trace_events_filter.c	tracing: Clean up after filter logic rewriting	2020-11-16 12:32:34 -05:00
trace_events_hist.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_events_inject.c	tracing: Initialize val to zero in parse_entry of inject code	2020-01-02 19:04:57 -05:00
trace_events_synth.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_events_trigger.c	tracing: Fix event trigger to accept redundant spaces	2020-06-23 21:51:40 -04:00
trace_events.c	tracing: Do not count ftrace events in top level enable output	2021-02-05 15:40:04 -05:00
trace_export.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_functions_graph.c	fgraph: Make overruns 4 bytes in graph stack structure	2020-11-10 20:39:36 -05:00
trace_functions.c	ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs	2020-11-13 12:14:55 -05:00
trace_hwlat.c	Tracing updates for 5.11	2020-12-17 13:22:17 -08:00
trace_irqsoff.c	tracing: Use pause-on-trace with the latency tracers	2021-01-29 15:35:33 -05:00
trace_kdb.c	tracing: Rename trace_buffer to array_buffer	2020-01-13 13:19:38 -05:00
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c	tracing/kprobe: Fix to support kretprobe events on unloaded modules	2021-01-29 15:39:48 -05:00
trace_mmiotrace.c	tracing: Make struct ring_buffer less ambiguous	2020-01-13 13:19:38 -05:00
trace_nop.c
trace_output.c	ftrace: Add recording of functions that caused recursion	2020-11-06 08:42:26 -05:00
trace_output.h	ftrace: Add recording of functions that caused recursion	2020-11-06 08:42:26 -05:00
trace_preemptirq.c	lockdep: fix order in trace_hardirqs_off_caller()	2020-09-14 10:08:07 +02:00
trace_printk.c	Updates for tracing and bootconfig:	2020-10-15 15:51:28 -07:00
trace_probe_tmpl.h
trace_probe.c	tracing/probe: Fix memleak in fetch_op_data operations	2020-06-16 21:21:02 -04:00
trace_probe.h	tracing: Move is_good_name() from trace_probe.h to trace.h	2020-10-15 12:01:13 -04:00
trace_recursion_record.c	ftrace: Add recording of functions that caused recursion	2020-11-06 08:42:26 -05:00
trace_sched_switch.c	tracing: Fix sched switch start/stop refcount racy updates	2020-01-30 09:46:10 -05:00
trace_sched_wakeup.c	ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs	2020-11-13 12:14:55 -05:00
trace_selftest_dynamic.c
trace_selftest.c	tracing: Disable ftrace selftests when any tracer is running	2020-12-14 12:05:03 -05:00
trace_seq.c	tracing: Remove unused TRACE_SEQ_BUF_USED	2020-01-21 18:39:54 -05:00
trace_stack.c	ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs	2020-11-13 12:14:55 -05:00
trace_stat.c	tracing: make tracing_init_dentry() returns an integer instead of a d_entry pointer	2020-09-18 22:17:14 -04:00
trace_stat.h	tracing: Use generic type for comparator function	2019-11-14 13:15:11 -05:00
trace_synth.h	tracing: Add support for dynamic strings to synthetic events	2020-10-05 19:32:18 -04:00
trace_syscalls.c	Tracing updates:	2020-02-06 07:12:11 +00:00
trace_uprobe.c	tracing/uprobes: Support perf-style return probe	2020-09-21 21:06:03 -04:00
trace.c	tracing: Check length before giving out the filter buffer	2021-02-11 14:23:37 -05:00
trace.h	tracing: Disable ftrace selftests when any tracer is running	2020-12-14 12:05:03 -05:00
tracing_map.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
tracing_map.h	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00