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perf header: Use a max number of command line args

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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 <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Arnaldo Carvalho de Melo 2026-04-08 14:32:00 -03:00 committed by Namhyung Kim
parent c89f35def8
commit fc32ae6df8
1 changed files with 6 additions and 0 deletions
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6
tools/perf/util/header.c
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@ -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);