Re: [PATCH v2 17/24] audit: Use timespec64 to represent audit timestamps

Richard Guy Briggs
2016-06-20T15:16:42Z

On 2016-06-19 17:27, Deepa Dinamani 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>
> Cc: Paul Moore <paul@paul-moore.com>
> Cc: Eric Paris <eparis@redhat.com>
> Cc: linux-audit@redhat.com
> 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(-)
>
> 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 fb1a3df..591c726 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -1527,7 +1527,7 @@ 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;
> @@ -1936,13 +1936,13 @@ 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
>
> --
> Linux-audit mailing list
> Linux-audit@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-audit

- RGB

--
Richard Guy Briggs <rgb@redhat.com>
Kernel Security Engineering, Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635
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