Commit-ID: caf8a0d0499792ac1b3f5b0b84e5890df0039cb6
Gitweb: http://git.kernel.org/tip/caf8a0d0499792ac1b3f5b0b84e5890df0039cb6
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Tue, 17 May 2016 11:56:24 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
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 <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Milian Wolff <milian.wolff@xxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-9gc412xx1gl0lvqj1d1xwlyb@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
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(-)
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 6e5c325..e488ac7 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -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,
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index b277984..bdc33ce 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -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;
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 83f4679..41ac9cf 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -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;
--
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