Shu Wang 87509592ec ftrace: Fix kmemleak in unregister_ftrace_graph ... commit 2b0b8499ae upstream. The trampoline allocated by function tracer was overwriten by function_graph tracer, and caused a memory leak. The save_global_trampoline should have saved the previous trampoline in register_ftrace_graph() and restored it in unregister_ftrace_graph(). But as it is implemented, save_global_trampoline was only used in unregister_ftrace_graph as default value 0, and it overwrote the previous trampoline's value. Causing the previous allocated trampoline to be lost. kmmeleak backtrace: kmemleak_vmalloc+0x77/0xc0 __vmalloc_node_range+0x1b5/0x2c0 module_alloc+0x7c/0xd0 arch_ftrace_update_trampoline+0xb5/0x290 ftrace_startup+0x78/0x210 register_ftrace_function+0x8b/0xd0 function_trace_init+0x4f/0x80 tracing_set_tracer+0xe6/0x170 tracing_set_trace_write+0x90/0xd0 __vfs_write+0x37/0x170 vfs_write+0xb2/0x1b0 SyS_write+0x55/0xc0 do_syscall_64+0x67/0x180 return_from_SYSCALL_64+0x0/0x6a [ Looking further into this, I found that this was left over from when the function and function graph tracers shared the same ftrace_ops. But in commit 5f151b2401 ("ftrace: Fix function_profiler and function tracer together"), the two were separated, and the save_global_trampoline no longer was necessary (and it may have been broken back then too). -- Steven Rostedt ] Link: http://lkml.kernel.org/r/20170912021454.5976-1-shuwang@redhat.com Fixes: 5f151b2401 ("ftrace: Fix function_profiler and function tracer together") Signed-off-by: Shu Wang <shuwang@redhat.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2017-10-12 11:27:33 +02:00
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blktrace.c
bpf_trace.c
ftrace.c	ftrace: Fix kmemleak in unregister_ftrace_graph	2017-10-12 11:27:33 +02:00
Kconfig
Makefile
power-traces.c
ring_buffer_benchmark.c
ring_buffer.c	ring-buffer: Have ring_buffer_iter_empty() return true when empty	2017-04-27 09:09:31 +02:00
rpm-traces.c
trace_benchmark.c
trace_benchmark.h
trace_branch.c
trace_clock.c
trace_entries.h
trace_event_perf.c
trace_events_filter_test.h
trace_events_filter.c	tracing: Fix freeing of filter in create_filter() when set_str is false	2017-08-30 10:19:24 +02:00
trace_events_trigger.c
trace_events.c
trace_export.c
trace_functions_graph.c	fgraph: Handle a case where a tracer ignores set_graph_notrace	2017-01-09 08:07:50 +01:00
trace_functions.c
trace_irqsoff.c
trace_kdb.c
trace_kprobe.c	tracing/kprobes: Allow to create probe with a module name starting with a digit	2017-07-15 11:57:45 +02:00
trace_mmiotrace.c
trace_nop.c
trace_output.c
trace_output.h
trace_printk.c
trace_probe.c
trace_probe.h
trace_sched_switch.c
trace_sched_wakeup.c
trace_selftest_dynamic.c
trace_selftest.c	ftrace: Fix selftest goto location on error	2017-09-27 11:00:16 +02:00
trace_seq.c
trace_stack.c
trace_stat.c
trace_stat.h
trace_syscalls.c
trace_uprobe.c
trace.c	tracing: Erase irqsoff trace with empty write	2017-10-05 09:41:44 +02:00
trace.h