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Date: Thu, 9 Jun 2016 19:59:43 -0400
From: Richard Guy Briggs <rgb@...hat.com>
To: Steve Grubb <sgrubb@...hat.com>
Cc: linux-audit@...hat.com, Arnd Bergmann <arnd@...db.de>,
y2038@...ts.linaro.org, linux-kernel@...r.kernel.org,
Al Viro <viro@...iv.linux.org.uk>,
linux-fsdevel@...r.kernel.org,
Thomas Gleixner <tglx@...utronix.de>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Deepa Dinamani <deepa.kernel@...il.com>
Subject: Re: [PATCH 17/21] audit: Use timespec64 to represent audit timestamps
On 16/06/09, Steve Grubb wrote:
> On Wednesday, June 08, 2016 10:05:01 PM 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.
>
> Have you tested this with ausearch or any audit utilities? As an aside, a time
> stamp that is up to 1024 characters long is terribly wasteful considering how
> many events we get.
Steve,
I don't expect the size of the time stamp text to change since the
format isn't being changed and I don't expect the date stamp text length
to change until Y10K, but you never know what will happen in 8
millenia... (Who knows, maybe that damn Linux server in my basement
will still be running then...)
Isn't the maximum message length MAX_AUDIT_MESSAGE_LENGTH (8970 octets)?
> -Steve
>
> > 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;
>
> --
> Linux-audit mailing list
> Linux-audit@...hat.com
> https://www.redhat.com/mailman/listinfo/linux-audit
- RGB
--
Richard Guy Briggs <rgb@...hat.com>
Kernel Security Engineering, Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635
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