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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-10-20 12:39:03 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-10-21 23:07:36 -0200 |
| commit | 3a531260a14631ae8d231279b8738884bf808e7b (patch) | |
| tree | a44858fb4663a75dc385f899da87989952cd190f /tools | |
| parent | ef8ff74ed8dd9d4b3ba8cb9f2fc927a27c697a8b (diff) | |
| download | lwn-3a531260a14631ae8d231279b8738884bf808e7b.tar.gz lwn-3a531260a14631ae8d231279b8738884bf808e7b.zip | |
perf trace: Validate syscall id before growing syscall table
In some cases the ID for a syscall read thru the raw_syscalls tracepoint
is bogus, still needs to be investigated why, but to make the tool more
robust first try to resolve the ID to a name via libaudit and if it
fails, don't grow the table.
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-0lsokw3xor7c4ijo45u6bauh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/builtin-trace.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index dec8ced61fb0..83c6515e425d 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -56,6 +56,10 @@ static int trace__read_syscall_info(struct trace *trace, int id) { char tp_name[128]; struct syscall *sc; + const char *name = audit_syscall_to_name(id, trace->audit_machine); + + if (name == NULL) + return -1; if (id > trace->syscalls.max) { struct syscall *nsyscalls = realloc(trace->syscalls.table, (id + 1) * sizeof(*sc)); @@ -75,11 +79,8 @@ static int trace__read_syscall_info(struct trace *trace, int id) } sc = trace->syscalls.table + id; - sc->name = audit_syscall_to_name(id, trace->audit_machine); - if (sc->name == NULL) - return -1; - - sc->fmt = syscall_fmt__find(sc->name); + sc->name = name; + sc->fmt = syscall_fmt__find(sc->name); snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name); sc->tp_format = event_format__new("syscalls", tp_name); |