Daniel Thompson c270cc75cd tracing: kdb: Fix kernel panic during ftdump ... Currently kdb's ftdump command unconditionally crashes due to a null pointer de-reference whenever the command is run. This in turn causes the kernel to panic. The abridged stacktrace (gathered with ARCH=arm) is: --- cut here --- [<c09535ac>] (panic) from [<c02132dc>] (die+0x264/0x440) [<c02132dc>] (die) from [<c0952eb8>] (__do_kernel_fault.part.11+0x74/0x84) [<c0952eb8>] (__do_kernel_fault.part.11) from [<c021f954>] (do_page_fault+0x1d0/0x3c4) [<c021f954>] (do_page_fault) from [<c020846c>] (do_DataAbort+0x48/0xac) [<c020846c>] (do_DataAbort) from [<c0213c58>] (__dabt_svc+0x38/0x60) Exception stack(0xc0deba88 to 0xc0debad0) ba80: e8c29180 00000001 e9854304 e9854300 c0f567d8 c0df2580 baa0: 00000000 00000000 00000000 c0f117b8 c0e3a3c0 c0debb0c 00000000 c0debad0 bac0: 0000672e c02f4d60 60000193 ffffffff [<c0213c58>] (__dabt_svc) from [<c02f4d60>] (kdb_ftdump+0x1e4/0x3d8) [<c02f4d60>] (kdb_ftdump) from [<c02ce328>] (kdb_parse+0x2b8/0x698) [<c02ce328>] (kdb_parse) from [<c02ceef0>] (kdb_main_loop+0x52c/0x784) [<c02ceef0>] (kdb_main_loop) from [<c02d1b0c>] (kdb_stub+0x238/0x490) --- cut here --- The NULL deref occurs due to the initialized use of struct trace_iter's buffer_iter member. This is a regression, albeit a fairly elderly one. It was introduced by commit 6d158a813e ("tracing: Remove NR_CPUS array from trace_iterator"). This patch solves this by providing a collection of ring_buffer_iter(s) and using this to initialize buffer_iter. Note that static allocation is used solely because the trace_iter itself is also static allocated. Static allocation also means that we have to NULL-ify the pointer during cleanup to avoid use-after-free problems. Link: http://lkml.kernel.org/r/1415277716-19419-2-git-send-email-daniel.thompson@linaro.org Cc: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>		2014-11-13 21:24:24 -05:00
..
blktrace.c	Most of the changes were largely clean ups, and some documentation.	2014-04-03 10:26:31 -07:00
ftrace.c	ftrace: Have the control_ops get a trampoline	2014-11-13 19:40:56 -05:00
Kconfig	tracing: Remove function_trace_stop and HAVE_FUNCTION_TRACE_MCOUNT_TEST	2014-07-18 13:58:12 -04:00
Makefile	tracing: Move the trace_seq_* functions into its own trace_seq.c file	2014-07-01 07:13:35 -04:00
power-traces.c	PM / tracing: remove deprecated power trace API	2013-01-26 00:39:12 +01:00
ring_buffer_benchmark.c	sched, cleanup, treewide: Remove set_current_state(TASK_RUNNING) after schedule()	2014-09-19 12:35:17 +02:00
ring_buffer.c	ring-buffer: Fix infinite spin in reading buffer	2014-10-02 16:51:18 -04:00
rpm-traces.c	PM / Runtime: Introduce trace points for tracing rpm_* functions	2011-09-27 22:53:27 +02:00
trace_benchmark.c	tracing: Only calculate stats of tracepoint benchmarks for 2^32 times	2014-06-06 00:41:38 -04:00
trace_benchmark.h	tracing: Add tracepoint benchmark tracepoint	2014-05-29 22:49:54 -04:00
trace_branch.c	tracing: Update event filters for multibuffer	2013-11-05 16:50:20 -05:00
trace_clock.c	tracing: Fix wraparound problems in "uptime" trace clock	2014-07-21 09:56:12 -04:00
trace_entries.h	tracing: Add trace_puts() for even faster trace_printk() tracing	2013-03-15 00:35:55 -04:00
trace_event_perf.c	perf: Check permission only for parent tracepoint event	2014-07-28 10:01:38 +02:00
trace_events_filter_test.h	tracing/filter: Add startup tests for events filter	2011-08-19 14:35:59 -04:00
trace_events_filter.c	tracing: Kill "filter_string" arg of replace_preds()	2014-07-16 14:58:53 -04:00
trace_events_trigger.c	tracing: Use rcu_dereference_sched() for trace event triggers	2014-05-02 23:12:42 -04:00
trace_events.c	tracing: Robustify wait loop	2014-10-08 19:51:01 -04:00
trace_export.c	tracing: Fix anonymous unions in struct ftrace_event_call	2014-04-09 20:02:55 -04:00
trace_functions_graph.c	tracing: Convert local function_graph functions to static	2014-07-18 21:16:06 -04:00
trace_functions.c	tracing: Remove mock up poll wait function	2014-04-30 08:40:05 -04:00
trace_irqsoff.c	tracing: Allow irq/preempt tracers to be used by instances	2014-04-21 13:59:29 -04:00
trace_kdb.c	tracing: kdb: Fix kernel panic during ftdump	2014-11-13 21:24:24 -05:00
trace_kprobe.c	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-06-12 19:18:49 -07:00
trace_mmiotrace.c	tracing: Update event filters for multibuffer	2013-11-05 16:50:20 -05:00
trace_nop.c	tracing: Remove mock up poll wait function	2014-04-30 08:40:05 -04:00
trace_output.c	tracing: Add entry->next_cpu to trace_ctxwake_bin()	2014-11-11 12:43:34 -05:00
trace_output.h	tracing: Make trace_seq_putmem_hex() more robust	2014-07-01 07:13:37 -04:00
trace_printk.c	tracing: Add __tracepoint_string() to export string pointers	2013-07-26 13:39:44 -04:00
trace_probe.c	kprobes, ftrace: Use NOKPROBE_SYMBOL macro in ftrace	2014-04-24 10:26:39 +02:00
trace_probe.h	kprobes, ftrace: Use NOKPROBE_SYMBOL macro in ftrace	2014-04-24 10:26:39 +02:00
trace_sched_switch.c	tracing: Move tracing_sched_{switch,wakeup}() into wakeup tracer	2014-11-11 12:43:15 -05:00
trace_sched_wakeup.c	tracing: Move tracing_sched_{switch,wakeup}() into wakeup tracer	2014-11-11 12:43:15 -05:00
trace_selftest_dynamic.c	ftrace: Add self-tests for multiple function trace users	2011-05-18 19:24:51 -04:00
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: Remove trace_seq_reserve()	2014-07-01 07:13:37 -04:00
trace_stack.c	sched: Add helper for task stack page overrun checking	2014-09-19 12:35:23 +02:00
trace_stat.c	trace/trace_stat: use rbtree postorder iteration helper instead of opencoding	2013-11-05 16:01:47 -05:00
trace_stat.h	tracing/stat: Add stat_release() callback	2009-07-10 12:14:05 +02:00
trace_syscalls.c	kernel: trace_syscalls: Replace rcu_assign_pointer() with RCU_INIT_POINTER()	2014-09-10 10:48:47 -04:00
trace_uprobe.c	tracing/uprobes: Kill the dead TRACE_EVENT_FL_USE_CALL_FILTER logic	2014-07-16 14:25:19 -04:00
trace.c	tracing: Fix traceoff_on_warning handling on boot command line	2014-11-13 21:03:41 -05:00
trace.h	tracing: Move tracing_sched_{switch,wakeup}() into wakeup tracer	2014-11-11 12:43:15 -05:00