Sargun Dhillon 96ae522795 bpf: Add bpf_probe_write_user BPF helper to be called in tracers ... This allows user memory to be written to during the course of a kprobe. It shouldn't be used to implement any kind of security mechanism because of TOC-TOU attacks, but rather to debug, divert, and manipulate execution of semi-cooperative processes. Although it uses probe_kernel_write, we limit the address space the probe can write into by checking the space with access_ok. We do this as opposed to calling copy_to_user directly, in order to avoid sleeping. In addition we ensure the threads's current fs / segment is USER_DS and the thread isn't exiting nor a kernel thread. Given this feature is meant for experiments, and it has a risk of crashing the system, and running programs, we print a warning on when a proglet that attempts to use this helper is installed, along with the pid and process name. Signed-off-by: Sargun Dhillon <sargun@sargun.me> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-07-25 18:07:48 -07:00
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blktrace.c	blktrace: add missed mask name	2016-05-10 08:41:36 -06:00
bpf_trace.c	bpf: Add bpf_probe_write_user BPF helper to be called in tracers	2016-07-25 18:07:48 -07:00
ftrace.c	Three more changes.	2016-05-22 19:40:39 -07:00
Kconfig	tracing: Add 'hist' event trigger command	2016-04-19 12:16:14 -04:00
Makefile	tracing: Add 'hist' event trigger command	2016-04-19 12:16:14 -04:00
power-traces.c	cpufreq: schedutil: New governor based on scheduler utilization data	2016-04-02 01:09:12 +02:00
ring_buffer_benchmark.c	ring_buffer: Remove unneeded smp_wmb() before wakeup of reader benchmark	2015-11-03 16:19:02 -05:00
ring_buffer.c	ring-buffer: Prevent overflow of size in ring_buffer_resize()	2016-05-13 16:44:20 -04:00
rpm-traces.c
trace_benchmark.c	tracing: Only benchmark the time tracepoints take if tracing is on	2015-11-02 13:34:58 -05:00
trace_benchmark.h	tracing: Add tracepoint benchmark tracepoint	2014-05-29 22:49:54 -04:00
trace_branch.c	tracing: Remove {start,stop}_branch_trace	2015-10-21 10:10:09 -04:00
trace_clock.c	tracing: Export tracing clock functions	2015-05-12 15:56:57 -04:00
trace_entries.h	tracing: %pF is only for function pointers	2015-03-25 08:57:22 -04:00
trace_event_perf.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2016-05-17 16:26:30 -07:00
trace_events_filter_test.h
trace_events_filter.c	tracing: Use temp buffer when filtering events	2016-05-03 17:59:24 -04:00
trace_events_hist.c	tracing: Add check for NULL event field when creating hist field	2016-04-26 09:40:29 -04:00
trace_events_trigger.c	tracing: Add support for named triggers	2016-04-19 18:56:00 -04:00
trace_events.c	This includes two new updates for the ftrace infrastructure.	2016-05-18 18:55:19 -07:00
trace_export.c	tracing: ftrace_event_is_function() can return boolean	2015-11-02 14:28:05 -05:00
trace_functions_graph.c	arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections	2016-03-25 16:37:42 -07:00
trace_functions.c	tracing: Make tracer_flags use the right set_flag callback	2016-03-08 11:19:08 -05:00
trace_irqsoff.c	tracing: Remove redundant reset per-CPU buff in irqsoff tracer	2016-03-18 16:39:11 -04:00
trace_kdb.c	tracing: Move trace_flags from global to a trace_array field	2015-09-30 15:22:55 -04:00
trace_kprobe.c	perf: split perf_trace_buf_prepare into alloc and update parts	2016-04-07 21:04:26 -04:00
trace_mmiotrace.c	kernel/...: convert pr_warning to pr_warn	2016-03-22 15:36:02 -07:00
trace_nop.c	tracing: Fix typoes in code comment and printk in trace_nop.c	2016-03-08 11:23:57 -05:00
trace_output.c	tracing: Record and show NMI state	2016-03-22 18:04:10 -04:00
trace_output.h	tracing: Turn seq_print_user_ip() into a static function	2015-09-28 10:16:12 -04:00
trace_printk.c	tracing: Handle NULL formats in hold_module_trace_bprintk_format()	2016-06-20 09:46:12 -04:00
trace_probe.c	kernel/...: convert pr_warning to pr_warn	2016-03-22 15:36:02 -07:00
trace_probe.h	kernel/trace_probe: is_good_name can be boolean	2015-09-22 13:11:30 -04:00
trace_sched_switch.c	sched/core: Fix trace_sched_switch()	2015-10-06 17:08:15 +02:00
trace_sched_wakeup.c	Most of the changes are clean ups and small fixes. Some of them have	2015-11-06 13:30:20 -08:00
trace_selftest_dynamic.c
trace_selftest.c	Seems that Peter Zijlstra added a new check that is making old	2014-10-12 07:28:55 -04:00
trace_seq.c	tracing: use %*pb[l] to print bitmaps including cpumasks and nodemasks	2015-02-13 21:21:37 -08:00
trace_stack.c	tracing, kasan: Silence Kasan warning in check_stack of stack_tracer	2016-02-19 12:36:44 -05:00
trace_stat.c	kernel/...: convert pr_warning to pr_warn	2016-03-22 15:36:02 -07:00
trace_stat.h
trace_syscalls.c	perf: split perf_trace_buf_prepare into alloc and update parts	2016-04-07 21:04:26 -04:00
trace_uprobe.c	perf: split perf_trace_buf_prepare into alloc and update parts	2016-04-07 21:04:26 -04:00
trace.c	tracing: Use temp buffer when filtering events	2016-05-03 17:59:24 -04:00
trace.h	tracing: Use temp buffer when filtering events	2016-05-03 17:59:24 -04:00
tracing_map.c	tracing: Handle tracing_map_alloc_elts() error path correctly	2016-04-26 09:40:30 -04:00
tracing_map.h	tracing: Update some tracing_map constants and comments	2016-04-19 12:16:06 -04:00