From: Arnaldo Carvalho de Melo Date: Wed, 8 Apr 2026 17:32:00 +0000 (-0300) Subject: perf header: Use a max number of command line args X-Git-Url: http://git.ipfire.org/index.cgi?a=commitdiff_plain;h=fc32ae6df83d78145391bfdaf0e213babad8e93f;p=thirdparty%2Fkernel%2Flinux.git perf header: Use a max number of command line args Sashiko suggests we use some reasonable max number of args to avoid overflows when reading perf.data files, do it. Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim --- diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index a3b7b796639b4..a18f216f77c27 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -2795,6 +2795,9 @@ process_event_desc(struct feat_fd *ff, void *data __maybe_unused) return 0; } +// Some reasonable arbitrary max for the number of command line arguments +#define MAX_CMDLINE_NR 32768 + static int process_cmdline(struct feat_fd *ff, void *data __maybe_unused) { struct perf_env *env = &ff->ph->env; @@ -2804,6 +2807,9 @@ static int process_cmdline(struct feat_fd *ff, void *data __maybe_unused) if (do_read_u32(ff, &nr)) return -1; + if (nr > MAX_CMDLINE_NR) + return -1; + env->nr_cmdline = nr; cmdline = zalloc(ff->size + nr + 1);