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[PATCH 10/12] net: sctp: avoid incorrect time_t use

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  [PATCH 10/12] net: sctp: avoid incorrect time_t use Arnd Bergmann <arnd@arndb.de> - 2015-09-30 13:30 +0200
    Re: [PATCH 10/12] net: sctp: avoid incorrect time_t use Neil Horman <nhorman@tuxdriver.com> - 2015-09-30 16:00 +0200
      Re: [PATCH 10/12] net: sctp: avoid incorrect time_t use Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> - 2015-09-30 16:20 +0200
        Re: [PATCH 10/12] net: sctp: avoid incorrect time_t use Neil Horman <nhorman@tuxdriver.com> - 2015-09-30 16:20 +0200
    Re: [PATCH 10/12] net: sctp: avoid incorrect time_t use Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> - 2015-09-30 16:30 +0200

#1236185 — [PATCH 10/12] net: sctp: avoid incorrect time_t use

We want to avoid using time_t in the kernel because of the y2038
overflow problem. The use in sctp is not for storing seconds at
all, but instead uses microseconds and is passed as 32-bit
on all machines.

This patch changes the type to u32, which better fits the use.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: linux-sctp@vger.kernel.org
---
 net/sctp/sm_make_chunk.c | 2 +-
 net/sctp/sm_statefuns.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 7954c52e1794..763e06a55155 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -2494,7 +2494,7 @@ static int sctp_process_param(struct sctp_association *asoc,
 	__u16 sat;
 	int retval = 1;
 	sctp_scope_t scope;
-	time_t stale;
+	u32 stale;
 	struct sctp_af *af;
 	union sctp_addr_param *addr_param;
 	struct sctp_transport *t;
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index d7eaa7354cf7..6f46aa16cb76 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -2306,7 +2306,7 @@ static sctp_disposition_t sctp_sf_do_5_2_6_stale(struct net *net,
 						 sctp_cmd_seq_t *commands)
 {
 	struct sctp_chunk *chunk = arg;
-	time_t stale;
+	u32 stale;
 	sctp_cookie_preserve_param_t bht;
 	sctp_errhdr_t *err;
 	struct sctp_chunk *reply;
-- 
2.1.0.rc2

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#1236312

On Wed, Sep 30, 2015 at 01:26:40PM +0200, Arnd Bergmann wrote:
> We want to avoid using time_t in the kernel because of the y2038
> overflow problem. The use in sctp is not for storing seconds at
> all, but instead uses microseconds and is passed as 32-bit
> on all machines.
> 
> This patch changes the type to u32, which better fits the use.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Cc: Vlad Yasevich <vyasevich@gmail.com>
> Cc: Neil Horman <nhorman@tuxdriver.com>
> Cc: linux-sctp@vger.kernel.org
> ---
>  net/sctp/sm_make_chunk.c | 2 +-
>  net/sctp/sm_statefuns.c  | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index 7954c52e1794..763e06a55155 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -2494,7 +2494,7 @@ static int sctp_process_param(struct sctp_association *asoc,
>  	__u16 sat;
>  	int retval = 1;
>  	sctp_scope_t scope;
> -	time_t stale;
> +	u32 stale;
>  	struct sctp_af *af;
>  	union sctp_addr_param *addr_param;
>  	struct sctp_transport *t;
> diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> index d7eaa7354cf7..6f46aa16cb76 100644
> --- a/net/sctp/sm_statefuns.c
> +++ b/net/sctp/sm_statefuns.c
> @@ -2306,7 +2306,7 @@ static sctp_disposition_t sctp_sf_do_5_2_6_stale(struct net *net,
>  						 sctp_cmd_seq_t *commands)
>  {
>  	struct sctp_chunk *chunk = arg;
> -	time_t stale;
> +	u32 stale;
>  	sctp_cookie_preserve_param_t bht;
>  	sctp_errhdr_t *err;
>  	struct sctp_chunk *reply;
> -- 
> 2.1.0.rc2
> 
> 

Assignments to this variable use ntohl, won't this change risk overflow?

Neil

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#1236350

On Wed, Sep 30, 2015 at 09:57:31AM -0400, Neil Horman wrote:
> On Wed, Sep 30, 2015 at 01:26:40PM +0200, Arnd Bergmann wrote:
> > We want to avoid using time_t in the kernel because of the y2038
> > overflow problem. The use in sctp is not for storing seconds at
> > all, but instead uses microseconds and is passed as 32-bit
> > on all machines.
> > 
> > This patch changes the type to u32, which better fits the use.
> > 
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > Cc: Vlad Yasevich <vyasevich@gmail.com>
> > Cc: Neil Horman <nhorman@tuxdriver.com>
> > Cc: linux-sctp@vger.kernel.org
> > ---
> >  net/sctp/sm_make_chunk.c | 2 +-
> >  net/sctp/sm_statefuns.c  | 2 +-
> >  2 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> > index 7954c52e1794..763e06a55155 100644
> > --- a/net/sctp/sm_make_chunk.c
> > +++ b/net/sctp/sm_make_chunk.c
> > @@ -2494,7 +2494,7 @@ static int sctp_process_param(struct sctp_association *asoc,
> >  	__u16 sat;
> >  	int retval = 1;
> >  	sctp_scope_t scope;
> > -	time_t stale;
> > +	u32 stale;
> >  	struct sctp_af *af;
> >  	union sctp_addr_param *addr_param;
> >  	struct sctp_transport *t;
> > diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> > index d7eaa7354cf7..6f46aa16cb76 100644
> > --- a/net/sctp/sm_statefuns.c
> > +++ b/net/sctp/sm_statefuns.c
> > @@ -2306,7 +2306,7 @@ static sctp_disposition_t sctp_sf_do_5_2_6_stale(struct net *net,
> >  						 sctp_cmd_seq_t *commands)
> >  {
> >  	struct sctp_chunk *chunk = arg;
> > -	time_t stale;
> > +	u32 stale;
> >  	sctp_cookie_preserve_param_t bht;
> >  	sctp_errhdr_t *err;
> >  	struct sctp_chunk *reply;
> > -- 
> > 2.1.0.rc2
> > 
> > 
> 
> Assignments to this variable use ntohl, won't this change risk overflow?
> 
> Neil

But isn't ntohl always 4 bytes long?

Marcelo

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#1236376

On Wed, Sep 30, 2015 at 11:15:20AM -0300, Marcelo Ricardo Leitner wrote:
> On Wed, Sep 30, 2015 at 09:57:31AM -0400, Neil Horman wrote:
> > On Wed, Sep 30, 2015 at 01:26:40PM +0200, Arnd Bergmann wrote:
> > > We want to avoid using time_t in the kernel because of the y2038
> > > overflow problem. The use in sctp is not for storing seconds at
> > > all, but instead uses microseconds and is passed as 32-bit
> > > on all machines.
> > > 
> > > This patch changes the type to u32, which better fits the use.
> > > 
> > > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > > Cc: Vlad Yasevich <vyasevich@gmail.com>
> > > Cc: Neil Horman <nhorman@tuxdriver.com>
> > > Cc: linux-sctp@vger.kernel.org
> > > ---
> > >  net/sctp/sm_make_chunk.c | 2 +-
> > >  net/sctp/sm_statefuns.c  | 2 +-
> > >  2 files changed, 2 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> > > index 7954c52e1794..763e06a55155 100644
> > > --- a/net/sctp/sm_make_chunk.c
> > > +++ b/net/sctp/sm_make_chunk.c
> > > @@ -2494,7 +2494,7 @@ static int sctp_process_param(struct sctp_association *asoc,
> > >  	__u16 sat;
> > >  	int retval = 1;
> > >  	sctp_scope_t scope;
> > > -	time_t stale;
> > > +	u32 stale;
> > >  	struct sctp_af *af;
> > >  	union sctp_addr_param *addr_param;
> > >  	struct sctp_transport *t;
> > > diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> > > index d7eaa7354cf7..6f46aa16cb76 100644
> > > --- a/net/sctp/sm_statefuns.c
> > > +++ b/net/sctp/sm_statefuns.c
> > > @@ -2306,7 +2306,7 @@ static sctp_disposition_t sctp_sf_do_5_2_6_stale(struct net *net,
> > >  						 sctp_cmd_seq_t *commands)
> > >  {
> > >  	struct sctp_chunk *chunk = arg;
> > > -	time_t stale;
> > > +	u32 stale;
> > >  	sctp_cookie_preserve_param_t bht;
> > >  	sctp_errhdr_t *err;
> > >  	struct sctp_chunk *reply;
> > > -- 
> > > 2.1.0.rc2
> > > 
> > > 
> > 
> > Assignments to this variable use ntohl, won't this change risk overflow?
> > 
> > Neil
> 
> But isn't ntohl always 4 bytes long?
> 
Oh, you might be right. I was thinking it was 8, but I'm wrong

Acked-by: Neil Horman <nhorman@tuxdriver.com>

> Marcelo
> 
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#1236399

On Wed, Sep 30, 2015 at 01:26:40PM +0200, Arnd Bergmann wrote:
> We want to avoid using time_t in the kernel because of the y2038
> overflow problem. The use in sctp is not for storing seconds at
> all, but instead uses microseconds and is passed as 32-bit
> on all machines.
> 
> This patch changes the type to u32, which better fits the use.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Cc: Vlad Yasevich <vyasevich@gmail.com>
> Cc: Neil Horman <nhorman@tuxdriver.com>
> Cc: linux-sctp@vger.kernel.org

Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>

> ---
>  net/sctp/sm_make_chunk.c | 2 +-
>  net/sctp/sm_statefuns.c  | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index 7954c52e1794..763e06a55155 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -2494,7 +2494,7 @@ static int sctp_process_param(struct sctp_association *asoc,
>  	__u16 sat;
>  	int retval = 1;
>  	sctp_scope_t scope;
> -	time_t stale;
> +	u32 stale;
>  	struct sctp_af *af;
>  	union sctp_addr_param *addr_param;
>  	struct sctp_transport *t;
> diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> index d7eaa7354cf7..6f46aa16cb76 100644
> --- a/net/sctp/sm_statefuns.c
> +++ b/net/sctp/sm_statefuns.c
> @@ -2306,7 +2306,7 @@ static sctp_disposition_t sctp_sf_do_5_2_6_stale(struct net *net,
>  						 sctp_cmd_seq_t *commands)
>  {
>  	struct sctp_chunk *chunk = arg;
> -	time_t stale;
> +	u32 stale;
>  	sctp_cookie_preserve_param_t bht;
>  	sctp_errhdr_t *err;
>  	struct sctp_chunk *reply;
> -- 
> 2.1.0.rc2
> 
> --
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> the body of a message to majordomo@vger.kernel.org
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