linux-kernel - [PATCH] audit: get comm using lock to avoid race in string printing

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Date:	Sat, 15 Mar 2014 19:29:15 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	linux-audit@...hat.com, linux-kernel@...r.kernel.org
Cc:	Richard Guy Briggs <rgb@...hat.com>, eparis@...hat.com,
	sgrubb@...hat.com
Subject: [PATCH] audit: get comm using lock to avoid race in string printing

---
 kernel/audit.c   |    5 ++---
 kernel/auditsc.c |    9 +++++----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 9239e5e..5b600c8 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1883,7 +1883,7 @@ EXPORT_SYMBOL(audit_log_task_context);
 void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
 {
 	const struct cred *cred;
-	char name[sizeof(tsk->comm)];
+	char comm[sizeof(tsk->comm)];
 	struct mm_struct *mm = tsk->mm;
 	char *tty;
 
@@ -1917,9 +1917,8 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
 			 from_kgid(&init_user_ns, cred->fsgid),
 			 tty, audit_get_sessionid(tsk));
 
-	get_task_comm(name, tsk);
 	audit_log_format(ab, " comm=");
-	audit_log_untrustedstring(ab, name);
+	audit_log_untrustedstring(ab, get_task_comm(name, tsk));
 
 	if (mm) {
 		down_read(&mm->mmap_sem);
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 8fffca8..b789e0c 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2289,7 +2289,7 @@ void __audit_ptrace(struct task_struct *t)
 	context->target_uid = task_uid(t);
 	context->target_sessionid = audit_get_sessionid(t);
 	security_task_getsecid(t, &context->target_sid);
-	memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
+	get_task_comm(context->target_comm, t);
 }
 
 /**
@@ -2328,7 +2328,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
 		ctx->target_uid = t_uid;
 		ctx->target_sessionid = audit_get_sessionid(t);
 		security_task_getsecid(t, &ctx->target_sid);
-		memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
+		get_task_comm(ctx->target_comm, t);
 		return 0;
 	}
 
@@ -2349,7 +2349,7 @@ int __audit_signal_info(int sig, 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(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], t);
 	axp->pid_count++;
 
 	return 0;
@@ -2435,6 +2435,7 @@ static void audit_log_task(struct audit_buffer *ab)
 	kgid_t gid;
 	unsigned int sessionid;
 	struct mm_struct *mm = current->mm;
+	char comm[sizeof(current->comm)];
 
 	auid = audit_get_loginuid(current);
 	sessionid = audit_get_sessionid(current);
@@ -2447,7 +2448,7 @@ static void audit_log_task(struct audit_buffer *ab)
 			 sessionid);
 	audit_log_task_context(ab);
 	audit_log_format(ab, " pid=%d comm=", task_pid_nr(current));
-	audit_log_untrustedstring(ab, current->comm);
+	audit_log_untrustedstring(ab, get_task_comm(comm, current);
 	if (mm) {
 		down_read(&mm->mmap_sem);
 		if (mm->exe_file)
-- 
1.7.1

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