linux-kernel - [PATCH 17/21] audit: Use timespec64 to represent audit timestamps

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Message-Id: <1465448705-25055-18-git-send-email-deepa.kernel@gmail.com>
Date:	Wed,  8 Jun 2016 22:05:01 -0700
From:	Deepa Dinamani <deepa.kernel@...il.com>
To:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	y2038@...ts.linaro.org, Paul Moore <paul@...l-moore.com>,
	Eric Paris <eparis@...hat.com>, linux-audit@...hat.com
Subject: [PATCH 17/21] audit: Use timespec64 to represent audit timestamps

struct timespec is not y2038 safe.
Audit timestamps are recorded in string format into
an audit buffer for a given context.
These mark the entry timestamps for the syscalls.
Use y2038 safe struct timespec64 to represent the times.
The log strings can handle this transition as strings can
hold upto 1024 characters.

Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
Cc: Paul Moore <paul@...l-moore.com>
Cc: Eric Paris <eparis@...hat.com>
Cc: linux-audit@...hat.com
---
 include/linux/audit.h |  4 ++--
 kernel/audit.c        | 10 +++++-----
 kernel/audit.h        |  2 +-
 kernel/auditsc.c      |  6 +++---
 4 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 961a417..2f6a1123 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -335,7 +335,7 @@ static inline void audit_ptrace(struct task_struct *t)
 				/* Private API (for audit.c only) */
 extern unsigned int audit_serial(void);
 extern int auditsc_get_stamp(struct audit_context *ctx,
-			      struct timespec *t, unsigned int *serial);
+			      struct timespec64 *t, unsigned int *serial);
 extern int audit_set_loginuid(kuid_t loginuid);
 
 static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
@@ -510,7 +510,7 @@ static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
 static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 { }
 static inline int auditsc_get_stamp(struct audit_context *ctx,
-			      struct timespec *t, unsigned int *serial)
+			      struct timespec64 *t, unsigned int *serial)
 {
 	return 0;
 }
diff --git a/kernel/audit.c b/kernel/audit.c
index 22bb4f2..6c2f405 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1325,10 +1325,10 @@ unsigned int audit_serial(void)
 }
 
 static inline void audit_get_stamp(struct audit_context *ctx,
-				   struct timespec *t, unsigned int *serial)
+				   struct timespec64 *t, unsigned int *serial)
 {
 	if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
-		*t = CURRENT_TIME;
+		ktime_get_real_ts64(t);
 		*serial = audit_serial();
 	}
 }
@@ -1370,7 +1370,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
 				     int type)
 {
 	struct audit_buffer	*ab	= NULL;
-	struct timespec		t;
+	struct timespec64	t;
 	unsigned int		uninitialized_var(serial);
 	int reserve = 5; /* Allow atomic callers to go up to five
 			    entries over the normal backlog limit */
@@ -1422,8 +1422,8 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
 
 	audit_get_stamp(ab->ctx, &t, &serial);
 
-	audit_log_format(ab, "audit(%lu.%03lu:%u): ",
-			 t.tv_sec, t.tv_nsec/1000000, serial);
+	audit_log_format(ab, "audit(%llu.%03lu:%u): ",
+			 (unsigned long long)t.tv_sec, t.tv_nsec/1000000, serial);
 	return ab;
 }
 
diff --git a/kernel/audit.h b/kernel/audit.h
index cbbe6bb..029d674 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -111,7 +111,7 @@ struct audit_context {
 	enum audit_state    state, current_state;
 	unsigned int	    serial;     /* serial number for record */
 	int		    major;      /* syscall number */
-	struct timespec	    ctime;      /* time of syscall entry */
+	struct timespec64   ctime;      /* time of syscall entry */
 	unsigned long	    argv[4];    /* syscall arguments */
 	long		    return_code;/* syscall return code */
 	u64		    prio;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 62ab53d..ecebb3c 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1523,7 +1523,7 @@ void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
 		return;
 
 	context->serial     = 0;
-	context->ctime      = CURRENT_TIME;
+	ktime_get_real_ts64(&context->ctime);
 	context->in_syscall = 1;
 	context->current_state  = state;
 	context->ppid       = 0;
@@ -1932,13 +1932,13 @@ EXPORT_SYMBOL_GPL(__audit_inode_child);
 /**
  * auditsc_get_stamp - get local copies of audit_context values
  * @ctx: audit_context for the task
- * @t: timespec to store time recorded in the audit_context
+ * @t: timespec64 to store time recorded in the audit_context
  * @serial: serial value that is recorded in the audit_context
  *
  * Also sets the context as auditable.
  */
 int auditsc_get_stamp(struct audit_context *ctx,
-		       struct timespec *t, unsigned int *serial)
+		       struct timespec64 *t, unsigned int *serial)
 {
 	if (!ctx->in_syscall)
 		return 0;
-- 
1.9.1