[PATCH 02/13] perf header: Bump up the max number of command line args allowed

Arnaldo Carvalho de Melo
2026-04-10T22:09:25Z

We need to do some upper limit validation, bump up the arbitrary limit
as per suggestion of Sashiko about command line wildcard expansion
ending up with more than 32768 args.

Link: https://sashiko.dev/#/patchset/20260408172846.96360-1-acme%40kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/header.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index a2796b72adc4d908..22c44b6f0b098f95 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2795,8 +2795,11 @@ 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
+/*
+ * Some arbitrary max for the number of command line arguments,
+ * Wildcards can expand and end up with tons of command line args.
+ */
+#define MAX_CMDLINE_NR 1048576

static int process_cmdline(struct feat_fd *ff, void *data __maybe_unused)
{
--
2.53.0