Luis Chamberlain ab2d90e58a blktrace: ensure our debugfs dir exists ... [ Upstream commit b431ef837e ] We make an assumption that a debugfs directory exists, but since this can fail ensure it exists before allowing blktrace setup to complete. Otherwise we end up stuffing blktrace files on the debugfs root directory. In the worst case scenario this *in theory* can create an eventual panic *iff* in the future a similarly named file is created prior on the debugfs root directory. This theoretical crash can happen due to a recursive removal followed by a specific dentry removal. This doesn't fix any known crash, however I have seen the files go into the main debugfs root directory in cases where the debugfs directory was not created due to other internal bugs with blktrace now fixed. blktrace is also completely useless without this directory, so this ensures to userspace we only setup blktrace if the kernel can stuff files where they are supposed to go into. debugfs directory creations typically aren't checked for, and we have maintainers doing sweep removals of these checks, but since we need this check to ensure proper userspace blktrace functionality we make sure to annotate the justification for the check. Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-09-03 11:26:42 +02:00
..
Kconfig	Stop the ad-hoc games with -Wno-maybe-initialized	2020-05-20 08:20:28 +02:00
Makefile	tracing: Add unified dynamic event framework	2018-12-08 20:54:09 -05:00
blktrace.c	blktrace: ensure our debugfs dir exists	2020-09-03 11:26:42 +02:00
bpf_trace.c	bpf: Fix deadlock with rq_lock in bpf_send_signal()	2020-04-17 10:49:57 +02:00
fgraph.c	ftrace: Look up the address of return_to_handler() using helpers	2019-09-18 12:24:47 +10:00
ftrace.c	tracing: Use trace_sched_process_free() instead of exit() for pid tracing	2020-08-21 13:05:27 +02:00
ftrace_internal.h	treewide: Rename rcu_dereference_raw_notrace() to _check()	2019-08-01 14:16:21 -07:00
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	tracing: Use trace_clock_local() for looping in preemptirq_delay_test.c	2018-10-17 15:35:33 -04:00
ring_buffer.c	ring-buffer: Zero out time extend if it is nested and not absolute	2020-06-30 15:37:10 -04:00
ring_buffer_benchmark.c	tracing: Use CONFIG_PREEMPTION	2019-07-31 19:03:35 +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
trace.c	tracing: Move pipe reference to trace array instead of current_tracer	2020-08-21 13:05:27 +02:00
trace.h	tracing: Move pipe reference to trace array instead of current_tracer	2020-08-21 13:05:27 +02:00
trace_benchmark.c	rcu: Rename cond_resched_rcu_qs() to cond_resched_tasks_rcu_qs()	2018-05-15 10:27:29 -07:00
trace_benchmark.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_branch.c	x86/uaccess, ftrace: Fix ftrace_likely_update() vs. SMAP	2019-04-03 11:02:24 +02:00
trace_clock.c	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -04:00
trace_dynevent.c	tracing: Add tracing_check_open_get_tr()	2019-10-12 20:44:07 -04:00
trace_dynevent.h	tracing/dynevent: Pass extra arguments to match operation	2019-08-31 12:19:38 -04:00
trace_entries.h	tracing: Change the function format to display function names by perf	2019-02-11 14:53:43 -05:00
trace_event_perf.c	tracing: Fix race in perf_trace_buf initialization	2019-10-21 19:38:28 -04:00
trace_events.c	tracing: Use trace_sched_process_free() instead of exit() for pid tracing	2020-08-21 13:05:27 +02:00
trace_events_filter.c	tracing: Avoid memory leak in process_system_preds()	2020-01-09 10:20:00 +01:00
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: Fix memory leaks in trace_events_hist.c	2020-05-10 10:31:28 +02:00
trace_events_trigger.c	tracing: Fix event trigger to accept redundant spaces	2020-06-30 15:37:10 -04:00
trace_export.c	tracing: Add trigger file for trace_markers tracefs/ftrace/print	2018-05-29 08:28:53 -04:00
trace_functions.c	tracing: Update stack trace skipping for ORC unwinder	2018-01-23 15:57:00 -05:00
trace_functions_graph.c	fgraph: Remove redundant ftrace_graph_notrace_addr() test	2019-07-30 21:50:03 -04:00
trace_hwlat.c	tracing/hwlat: Honor the tracing_cpumask	2020-08-21 13:05:27 +02:00
trace_irqsoff.c	The biggest change for this release is in the histogram code.	2019-03-11 17:01:32 -07:00
trace_kdb.c	tracing: Silence GCC 9 array bounds warning	2019-05-25 23:04:30 -04:00
trace_kprobe.c	tracing/probe: Fix bpf_task_fd_query() for kprobes and uprobes	2020-06-24 17:50:43 +02:00
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	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
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: Be more clever when dumping hex in __print_hex()	2019-09-17 11:21:28 -04:00
trace_output.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_preemptirq.c	kprobes: Prohibit probing on hardirq tracers	2019-02-13 08:16:40 +01:00
trace_printk.c	tracing: Add locked_down checks to the open calls of files created for tracefs	2019-10-12 20:48:06 -04:00
trace_probe.c	tracing/probe: Fix memleak in fetch_op_data operations	2020-06-24 17:50:51 +02:00
trace_probe.h	tracing/uprobe: Fix to make trace_uprobe_filter alignment safe	2020-02-05 21:22:53 +00:00
trace_probe_tmpl.h	tracing/probe: Support user-space dereference	2019-05-25 23:04:42 -04:00
trace_sched_switch.c	tracing: Fix sched switch start/stop refcount racy updates	2020-02-11 04:35:07 -08:00
trace_sched_wakeup.c	kernel/trace: Fix do not unregister tracepoints when register sched_migrate_task fail	2020-01-14 20:08:22 +01:00
trace_selftest.c	function_graph: Have selftest also emulate tr->reset() as it did with tr->init()	2019-04-21 19:46:56 -04:00
trace_selftest_dynamic.c	ftrace: Mark function tracer test functions noinline/noclone	2018-01-23 15:57:29 -05:00
trace_seq.c	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -04:00
trace_stack.c	tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined	2020-01-14 20:08:22 +01:00
trace_stat.c	tracing: Fix very unlikely race of registering two stat tracers	2020-02-24 08:36:30 +01:00
trace_stat.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00
trace_syscalls.c	syscalls: Remove start and number from syscall_get_arguments() args	2019-04-05 09:26:43 -04:00
trace_uprobe.c	tracing/probe: Fix bpf_task_fd_query() for kprobes and uprobes	2020-06-24 17:50:43 +02:00
tracing_map.c	tracing: Have the histogram compare functions convert to u64 first	2020-01-09 10:20:00 +01:00
tracing_map.h	tracing: Fix SPDX format headers to use C++ style comments	2018-08-16 19:08:06 -04:00