[PATCH 1/2] exec: use strnlen() in __set_task_comm

Thorsten Blum
2026-04-01T15:21:50Z

Use strnlen() to limit source string scanning to 'TASK_COMM_LEN - 1'
bytes.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
fs/exec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/exec.c b/fs/exec.c
index 9ea3a775d51e..ba12b4c466f6 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1074,7 +1074,7 @@ static int unshare_sighand(struct task_struct *me)
*/
void __set_task_comm(struct task_struct *tsk, const char *buf, bool exec)
{
- size_t len = min(strlen(buf), sizeof(tsk->comm) - 1);
+ size_t len = strnlen(buf, sizeof(tsk->comm) - 1);

trace_task_rename(tsk, buf);
memcpy(tsk->comm, buf, len);