Re: [PATCH 06/12] audit: Use timespec64 to represent audit timestamps

From: Paul Moore <paul@paul-moore.com>
To: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
	tglx@linutronix.de, viro@zeniv.linux.org.uk,
	gregkh@linuxfoundation.org, andreas.dilger@intel.com,
	arnd@arndb.de, bfields@fieldses.org, clm@fb.com,
	davem@davemloft.net, dsterba@suse.com, dushistov@mail.ru,
	Eric Paris <eparis@redhat.com>,
	jaegeuk@kernel.org, jbacik@fb.com, jlayton@poochiereds.net,
	john.stultz@linaro.org, jsimmons@infradead.org, mingo@redhat.com,
	oleg.drokin@intel.com, rostedt@goodmis.org, yuchao0@huawei.com,
	ceph-devel@vger.kernel.org, devel@driverdev.osuosl.org,
	linux-audit@redhat.com, linux-btrfs@vger.kernel.org,
	linux-cifs@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-fsdevel@vger.kernel.org, linux-mtd@lists.infradead.org,
	linux-security-module@vger.kernel.org,
	lustre-devel@lists.lustre.org, netdev@vger.kernel.org,
	samba-technical@lists.samba.org, y2038@lists.linaro.org
Subject: Re: [PATCH 06/12] audit: Use timespec64 to represent audit timestamps
Date: Sat, 8 Apr 2017 08:40:17 -0400	[thread overview]
Message-ID: <CAHC9VhTYWeKL+BAb6F3tfwzs7OKUEA8ANM=V05sfoiahNNX=9w@mail.gmail.com> (raw)
In-Reply-To: <1491613030-11599-7-git-send-email-deepa.kernel@gmail.com>

On Fri, Apr 7, 2017 at 8:57 PM, Deepa Dinamani <deepa.kernel@gmail.com> wrote:
> 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@gmail.com>
> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
> Acked-by: Paul Moore <paul@paul-moore.com>
> Acked-by: Richard Guy Briggs <rgb@redhat.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(-)

I have no problem merging this patch into audit/next for v4.12, would
you prefer me to do that so at least this patch is merged?

It would probably make life a small bit easier for us in the audit
world too as it would reduce the potential merge conflict.  However,
that's a relatively small thing to worry about.

> diff --git a/include/linux/audit.h b/include/linux/audit.h
> index 6fdfefc..f830508 100644
> --- a/include/linux/audit.h
> +++ b/include/linux/audit.h
> @@ -332,7 +332,7 @@ 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)
> @@ -511,7 +511,7 @@ 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 2f4964c..fcbf377 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -1625,10 +1625,10 @@ 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();
>         }
>  }
> @@ -1652,7 +1652,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
>                                      int type)
>  {
>         struct audit_buffer *ab;
> -       struct timespec t;
> +       struct timespec64 t;
>         unsigned int uninitialized_var(serial);
>
>         if (audit_initialized != AUDIT_INITIALIZED)
> @@ -1705,8 +1705,8 @@ 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 0f1cf6d..cdf96f4 100644
> --- a/kernel/audit.h
> +++ b/kernel/audit.h
> @@ -112,7 +112,7 @@ 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 e59ffc7..a2d9217 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -1532,7 +1532,7 @@ 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;
> @@ -1941,13 +1941,13 @@ 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;
> --
> 2.7.4
>

-- 
paul moore
www.paul-moore.com