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exec: use strnlen() in __set_task_comm

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

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260401152039.724811-3-thorsten.blum@linux.dev
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Thorsten Blum
2026-04-01 17:20:40 +02:00
committed by Kees Cook
parent 4ced4cf5c9
commit 10cd6758e0
1 changed files with 1 additions and 1 deletions
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2
fs/exec.c
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@@ -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);