[PATCH 3/6] auditsc: Replace memcpy() with __get_task_comm()

Yafang Shao
2024-06-02T02:38:36Z

Using __get_task_comm() to read the task comm ensures that the name is
always NUL-terminated, regardless of the source string. This approach also
facilitates future extensions to the task comm.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Eric Paris <eparis@redhat.com>
---
kernel/auditsc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 6f0d6fb6523f..0459a141dc86 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2730,7 +2730,7 @@ void __audit_ptrace(struct task_struct *t)
context->target_uid = task_uid(t);
context->target_sessionid = audit_get_sessionid(t);
security_task_getsecid_obj(t, &context->target_sid);
- memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
+ __get_task_comm(context->target_comm, TASK_COMM_LEN, t);
}

/**
@@ -2757,7 +2757,7 @@ int audit_signal_info_syscall(struct task_struct *t)
ctx->target_uid = t_uid;
ctx->target_sessionid = audit_get_sessionid(t);
security_task_getsecid_obj(t, &ctx->target_sid);
- memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
+ __get_task_comm(ctx->target_comm, TASK_COMM_LEN, t);
return 0;
}

@@ -2778,7 +2778,7 @@ int audit_signal_info_syscall(struct task_struct *t)
axp->target_uid[axp->pid_count] = t_uid;
axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
security_task_getsecid_obj(t, &axp->target_sid[axp->pid_count]);
- memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
+ __get_task_comm(axp->target_comm[axp->pid_count], TASK_COMM_LEN, t);
axp->pid_count++;

return 0;
--
2.39.1