[PATCH v3 04/11] bpftool: Ensure task comm is always NUL-terminated

Yafang Shao
2024-06-21T02:31:20Z

Let's explicitly ensure the destination string is NUL-terminated. This way,
it won't be affected by changes to the source string.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Reviewed-by: Quentin Monnet <qmo@kernel.org>
---
tools/bpf/bpftool/pids.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/tools/bpf/bpftool/pids.c b/tools/bpf/bpftool/pids.c
index 9b898571b49e..23f488cf1740 100644
--- a/tools/bpf/bpftool/pids.c
+++ b/tools/bpf/bpftool/pids.c
@@ -54,6 +54,7 @@ static void add_ref(struct hashmap *map, struct pid_iter_entry *e)
ref = &refs->refs[refs->ref_cnt];
ref->pid = e->pid;
memcpy(ref->comm, e->comm, sizeof(ref->comm));
+ ref->comm[sizeof(ref->comm) - 1] = '\0';
refs->ref_cnt++;

return;
@@ -77,6 +78,7 @@ static void add_ref(struct hashmap *map, struct pid_iter_entry *e)
ref = &refs->refs[0];
ref->pid = e->pid;
memcpy(ref->comm, e->comm, sizeof(ref->comm));
+ ref->comm[sizeof(ref->comm) - 1] = '\0';
refs->ref_cnt = 1;
refs->has_bpf_cookie = e->has_bpf_cookie;
refs->bpf_cookie = e->bpf_cookie;
--
2.39.1