Steven Rostedt (VMware) 9a6944fee6 tracing: Add a verifier to check string pointers for trace events ... It is a common mistake for someone writing a trace event to save a pointer to a string in the TP_fast_assign() and then display that string pointer in the TP_printk() with %s. The problem is that those two events may happen a long time apart, where the source of the string may no longer exist. The proper way to handle displaying any string that is not guaranteed to be in the kernel core rodata section, is to copy it into the ring buffer via the __string(), __assign_str() and __get_str() helper macros. Add a check at run time while displaying the TP_printk() of events to make sure that every %s referenced is safe to dereference, and if it is not, trigger a warning and only show the address of the pointer, and the dereferenced string if it can be safely retrieved with a strncpy_from_kernel_nofault() call. In order to not have to copy the parsing of vsnprintf() formats, or even exporting its code, the verifier relies on vsnprintf() being able to modify the va_list that is passed to it, and it remains modified after it is called. This is the case for some architectures like x86_64, but other architectures like x86_32 pass the va_list to vsnprintf() as a value not a reference, and the verifier can not use it to parse the non string arguments. Thus, at boot up, it is checked if vsnprintf() modifies the passed in va_list or not, and a static branch will disable the verifier if it's not compatible. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>		2021-03-18 12:58:27 -04:00
..
blktrace.c	block-5.12-2021-02-27	2021-02-28 11:23:38 -08:00
bpf_trace.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2021-02-16 13:14:06 -08:00
bpf_trace.h	bpf: Use dedicated bpf_trace_printk event instead of trace_printk()	2020-07-13 16:55:49 -07:00
error_report-traces.c	tracing: add error_report_end trace point	2021-02-26 09:41:02 -08:00
fgraph.c	fgraph: Initialize tracing_graph_pause at task creation	2021-01-29 15:07:32 -05:00
ftrace.c	Tracing updates for 5.11	2020-12-17 13:22:17 -08:00
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
Kconfig	tracing: Fix help text of TRACEPOINT_BENCHMARK in Kconfig	2021-03-04 09:45:17 -05:00
kprobe_event_gen_test.c	tracing: Add kprobe event command generation test module	2020-01-30 09:46:28 -05:00
Makefile	tracing: add error_report_end trace point	2021-02-26 09:41:02 -08:00
power-traces.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
preemptirq_delay_test.c	kernel: trace: preemptirq_delay_test: add cpu affinity	2021-02-02 17:02:07 -05:00
ring_buffer.c	ring-buffer: Add verifier for using ring_buffer_event_time_stamp()	2021-03-18 12:58:26 -04:00
ring_buffer_benchmark.c	sched,tracing: Convert to sched_set_fifo()	2020-07-29 11:43:53 +02:00
rpm-traces.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
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.c	tracing: Add a verifier to check string pointers for trace events	2021-03-18 12:58:27 -04:00
trace.h	tracing: Add a verifier to check string pointers for trace events	2021-03-18 12:58:27 -04:00
trace_benchmark.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_benchmark.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_boot.c	tracing: Disable ftrace selftests when any tracer is running	2020-12-14 12:05:03 -05:00
trace_branch.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_clock.c	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -04:00
trace_dynevent.c	tracing/dynevent: Delegate parsing to create function	2021-02-09 12:52:15 -05:00
trace_dynevent.h	tracing/dynevent: Delegate parsing to create function	2021-02-09 12:52:15 -05:00
trace_entries.h	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_event_perf.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_events.c	tracing: Add check of trace event print fmts for dereferencing pointers	2021-03-18 12:58:26 -04:00
trace_events_filter.c	tracing: Clean up after filter logic rewriting	2020-11-16 12:32:34 -05:00
trace_events_filter_test.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_events_hist.c	tracing: Use a no_filter_buffering_ref to stop using the filter buffer	2021-03-18 12:58:26 -04:00
trace_events_inject.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_events_synth.c	tracing: Fix memory leak in __create_synth_event()	2021-03-04 09:45:57 -05:00
trace_events_trigger.c	tracing: Pass buffer of event to trigger operations	2021-03-18 12:58:26 -04:00
trace_export.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_functions.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_functions_graph.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_hwlat.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_irqsoff.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_kdb.c	tracing: Rename trace_buffer to array_buffer	2020-01-13 13:19:38 -05:00
trace_kprobe.c	Modules updates for v5.12	2021-02-23 10:15:33 -08:00
trace_kprobe_selftest.c	selftest/ftrace: Move kprobe selftest function to separate compile unit	2018-07-30 18:41:04 -04:00
trace_kprobe_selftest.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_mmiotrace.c	tracing: Remove definition of DEBUG in trace_mmiotrace.c	2021-02-02 17:02:07 -05:00
trace_nop.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_output.c	tracing: Add a verifier to check string pointers for trace events	2021-03-18 12:58:27 -04:00
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	tracing: Add a verifier to check string pointers for trace events	2021-03-18 12:58:27 -04:00
trace_probe.c	tracing/dynevent: Delegate parsing to create function	2021-02-09 12:52:15 -05:00
trace_probe.h	tracing/dynevent: Delegate parsing to create function	2021-02-09 12:52:15 -05:00
trace_probe_tmpl.h	tracing/probe: Support user-space dereference	2019-05-25 23:04:42 -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	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_selftest.c	tracing: Disable ftrace selftests when any tracer is running	2020-12-14 12:05:03 -05:00
trace_selftest_dynamic.c	ftrace: Mark function tracer test functions noinline/noclone	2018-01-23 15:57:29 -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: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_uprobe.c	tracing/dynevent: Delegate parsing to create function	2021-02-09 12:52:15 -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