netdev - [PATCH v3 02/11] auditsc: Replace memcpy() with __get_task

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Date: Fri, 21 Jun 2024 10:29:50 +0800
From: Yafang Shao <laoar.shao@...il.com>
To: torvalds@...ux-foundation.org
Cc: ebiederm@...ssion.com,
	alexei.starovoitov@...il.com,
	rostedt@...dmis.org,
	catalin.marinas@....com,
	akpm@...ux-foundation.org,
	penguin-kernel@...ove.sakura.ne.jp,
	linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	audit@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	selinux@...r.kernel.org,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	Yafang Shao <laoar.shao@...il.com>,
	Paul Moore <paul@...l-moore.com>,
	Eric Paris <eparis@...hat.com>
Subject: [PATCH v3 02/11] auditsc: Replace memcpy() with __get_task_comm()

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@...il.com>
Acked-by: Paul Moore <paul@...l-moore.com>
Cc: Eric Paris <eparis@...hat.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