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perf trace: Warn when trying to resolve kernel addresses with kptr_restrict=1

tip:perf/urgent tip-bot for Arnaldo Carvalho de Melo 1 participant 1 message May 20, 2016 perf events

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Commit-ID:  caf8a0d0499792ac1b3f5b0b84e5890df0039cb6
Gitweb:     http://git.kernel.org/tip/caf8a0d0499792ac1b3f5b0b84e5890df0039cb6
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Tue, 17 May 2016 11:56:24 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Fri, 20 May 2016 11:43:54 -0300

perf trace: Warn when trying to resolve kernel addresses with kptr_restrict=1

Hook into the libtraceevent plugin kernel symbol resolver to warn the user that that can't happen with kptr_restrict=1.

Cc Adrian Hunter <[email protected]>
Cc David Ahern <[email protected]>
Cc Jiri Olsa <[email protected]>
Cc Milian Wolff <[email protected]>
Cc Namhyung Kim <[email protected]>
Cc Wang Nan <[email protected]>
Link http://lkml.kernel.org/n/[email protected] open here
Signed-off-by Arnaldo Carvalho de Melo <[email protected]>
---
 tools/perf/builtin-trace.c | 20 +++++++++++++++++++-
 tools/perf/util/machine.c  |  1 +
 tools/perf/util/machine.h  |  1 +
 3 files changed, 21 insertions(+), 1 deletion(-)
tools/perf/builtin-trace.c +19 -1
index 6e5c325..e488ac7 100644
@@ -1160,6 +1160,24 @@ static int trace__tool_process(struct perf_tool *tool,
 	return trace__process_event(trace, machine, event, sample);
 }
 
+static char *trace__machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp)
+{
+	struct machine *machine = vmachine;
+
+	if (machine->kptr_restrict_warned)
+		return NULL;
+
+	if (symbol_conf.kptr_restrict) {
+		pr_warning("Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
+			   "Check /proc/sys/kernel/kptr_restrict.\n\n"
+			   "Kernel samples will not be resolved.\n");
+		machine->kptr_restrict_warned = true;
+		return NULL;
+	}
+
+	return machine__resolve_kernel_addr(vmachine, addrp, modp);
+}
+
 static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
 {
 	int err = symbol__init(NULL);

@@ -1171,7 +1189,7 @@ static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
 	if (trace->host == NULL)
 		return -ENOMEM;
 
-	if (trace_event__register_resolver(trace->host, machine__resolve_kernel_addr) < 0)
+	if (trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr) < 0)
 		return -errno;
 
 	err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
tools/perf/util/machine.c +1 -0
index b277984..bdc33ce 100644
@@ -43,6 +43,7 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
 
 	machine->symbol_filter = NULL;
 	machine->id_hdr_size = 0;
+	machine->kptr_restrict_warned = false;
 	machine->comm_exec = false;
 	machine->kernel_start = 0;
tools/perf/util/machine.h +1 -0
index 83f4679..41ac9cf 100644
@@ -28,6 +28,7 @@ struct machine {
 	pid_t		  pid;
 	u16		  id_hdr_size;
 	bool		  comm_exec;
+	bool		  kptr_restrict_warned;
 	char		  *root_dir;
 	struct rb_root	  threads;
 	pthread_rwlock_t  threads_lock;