Re: [PATCH 2/3] socket: Rename SO_RCVTIMEO/ SO_SNDTIMEO with _OLD suffixes
On Tue, Jan 8, 2019 at 12:04 PM Arnd Bergmann wrote:
>
> On Tue, Jan 8, 2019 at 6:24 AM Deepa Dinamani wrote:
> >
> > SO_RCVTIMEO and SO_SNDTIMEO socket options use struct timeval
> > as the time format. struct timeval is not y2038 safe.
> > The subsequent patches in the series add support for new socket
> > timeout options with _NEW suffix that are y2038 safe.
> > Rename the existing options with _OLD suffix forms so that the
> > right option is enabled for userspace applications according
> > to the architecture and time_t definition of libc.
> >
> > Signed-off-by: Deepa Dinamani
>
> Looks good overall. A few minor concerns:
>
> The description above makes it sound like there is a bug with y2038-safety
> in this particular interface, which I think is just not what you meant,
> as the change is only needed for compatiblity with new C libraries
> that work around the y2038 problem in general by changing their
> timeval definition.
Right, there is y2038 safety issue, just the libc part that needs to be handled.
I will fix the commit text.
> > diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
> > index 76976d6e50f9..c98ad9777ad9 100644
> > --- a/fs/dlm/lowcomms.c
> > +++ b/fs/dlm/lowcomms.c
> > @@ -1089,12 +1089,12 @@ static void sctp_connect_to_sock(struct connection
> > *con)
> > * since O_NONBLOCK argument in connect() function does not work
> > here,
> > * then, we should restore the default value of this attribute.
> > */
> > - kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (char *),
> > + kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO_OLD, (char *),
> > sizeof(tv));
> > result = sock->ops->connect(sock, (struct sockaddr *),
> > addr_len,
> >0);
> > memset(, 0, sizeof(tv));
> > - kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (char *),
> > + kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO_OLD, (char *),
> > sizeof(tv));
> >
> > if (result == -EINPROGRESS)
>
> It took me a bit to realize there that this is safe as well even if
> we don't use SO_SNDTIMEO_NEW, for the same reason.
Correct.
> > --- a/net/compat.c
> > +++ b/net/compat.c
> > @@ -378,7 +378,7 @@ static int compat_sock_setsockopt(struct socket *sock,
> > int level, int optname,
> > return do_set_attach_filter(sock, level, optname,
> > optval, optlen);
> > if (!COMPAT_USE_64BIT_TIME &&
> > - (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
> > + (optname == SO_RCVTIMEO_OLD || optname == SO_SNDTIMEO_OLD))
> > return do_set_sock_timeout(sock, level, optname, optval,
> > optlen);
> >
> > return sock_setsockopt(sock, level, optname, optval, optlen);
> > @@ -450,7 +450,7 @@ static int compat_sock_getsockopt(struct socket *sock,
> > int level, int optname,
> > char __user *optval, int __user *optlen)
> > {
> > if (!COMPAT_USE_64BIT_TIME &&
> > - (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
> > + (optname == SO_RCVTIMEO_OLD || optname == SO_SNDTIMEO_OLD))
> > return do_get_sock_timeout(sock, level, optname, optval,
> > optlen);
> > return sock_getsockopt(sock, level, optname, optval, optlen);
> > }
>
> I looked at the original code and noticed that it's horrible, which of course
> is not your fault, but I wonder if we should just fix it now to avoid that
> get_fs()/set_fs() hack, since that code mostly implements what you
> also have in your patch 3 (which is done more nicely).
I did think of getting rid of set_fs()/ get_fs() here.
But, I wasn't sure as the maintainers seemed to prefer to leave to the
old code as is in the other series for timestamps.
> I'll follow up with a patch to demonstrate what I mean here. Your third
> patch will then just have to add another code path so we can handle
> all of old_timespec32 (for existing 32-bit user space), __kernel_old_timespec
> (for sparc64) and __kernel_sock_timeval (for everything else).
Cool, I will rebase on top of your patch.
Thanks,
Deepa
Re: [PATCH 2/3] socket: Rename SO_RCVTIMEO/ SO_SNDTIMEO with _OLD suffixes
On Tue, Jan 8, 2019 at 6:24 AM Deepa Dinamani wrote:
>
> SO_RCVTIMEO and SO_SNDTIMEO socket options use struct timeval
> as the time format. struct timeval is not y2038 safe.
> The subsequent patches in the series add support for new socket
> timeout options with _NEW suffix that are y2038 safe.
> Rename the existing options with _OLD suffix forms so that the
> right option is enabled for userspace applications according
> to the architecture and time_t definition of libc.
>
> Signed-off-by: Deepa Dinamani
Looks good overall. A few minor concerns:
The description above makes it sound like there is a bug with y2038-safety
in this particular interface, which I think is just not what you meant,
as the change is only needed for compatiblity with new C libraries
that work around the y2038 problem in general by changing their
timeval definition.
> diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
> index 76976d6e50f9..c98ad9777ad9 100644
> --- a/fs/dlm/lowcomms.c
> +++ b/fs/dlm/lowcomms.c
> @@ -1089,12 +1089,12 @@ static void sctp_connect_to_sock(struct connection
> *con)
> * since O_NONBLOCK argument in connect() function does not work here,
> * then, we should restore the default value of this attribute.
> */
> - kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (char *),
> + kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO_OLD, (char *),
> sizeof(tv));
> result = sock->ops->connect(sock, (struct sockaddr *), addr_len,
>0);
> memset(, 0, sizeof(tv));
> - kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (char *),
> + kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO_OLD, (char *),
> sizeof(tv));
>
> if (result == -EINPROGRESS)
It took me a bit to realize there that this is safe as well even if
we don't use SO_SNDTIMEO_NEW, for the same reason.
> --- a/net/compat.c
> +++ b/net/compat.c
> @@ -378,7 +378,7 @@ static int compat_sock_setsockopt(struct socket *sock,
> int level, int optname,
> return do_set_attach_filter(sock, level, optname,
> optval, optlen);
> if (!COMPAT_USE_64BIT_TIME &&
> - (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
> + (optname == SO_RCVTIMEO_OLD || optname == SO_SNDTIMEO_OLD))
> return do_set_sock_timeout(sock, level, optname, optval,
> optlen);
>
> return sock_setsockopt(sock, level, optname, optval, optlen);
> @@ -450,7 +450,7 @@ static int compat_sock_getsockopt(struct socket *sock,
> int level, int optname,
> char __user *optval, int __user *optlen)
> {
> if (!COMPAT_USE_64BIT_TIME &&
> - (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
> + (optname == SO_RCVTIMEO_OLD || optname == SO_SNDTIMEO_OLD))
> return do_get_sock_timeout(sock, level, optname, optval,
> optlen);
> return sock_getsockopt(sock, level, optname, optval, optlen);
> }
I looked at the original code and noticed that it's horrible, which of course
is not your fault, but I wonder if we should just fix it now to avoid that
get_fs()/set_fs() hack, since that code mostly implements what you
also have in your patch 3 (which is done more nicely).
I'll follow up with a patch to demonstrate what I mean here. Your third
patch will then just have to add another code path so we can handle
all of old_timespec32 (for existing 32-bit user space), __kernel_old_timespec
(for sparc64) and __kernel_sock_timeval (for everything else).
Arnd
[PATCH 2/3] socket: Rename SO_RCVTIMEO/ SO_SNDTIMEO with _OLD suffixes
SO_RCVTIMEO and SO_SNDTIMEO socket options use struct timeval as the time format. struct timeval is not y2038 safe. The subsequent patches in the series add support for new socket timeout options with _NEW suffix that are y2038 safe. Rename the existing options with _OLD suffix forms so that the right option is enabled for userspace applications according to the architecture and time_t definition of libc. Signed-off-by: Deepa Dinamani Cc: ccaul...@redhat.com Cc: del...@gmx.de Cc: pau...@samba.org Cc: r...@linux-mips.org Cc: r...@twiddle.net Cc: cluster-de...@redhat.com Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-al...@vger.kernel.org Cc: linux-a...@vger.kernel.org Cc: linux-m...@vger.kernel.org Cc: linux-par...@vger.kernel.org Cc: sparcli...@vger.kernel.org --- arch/alpha/include/uapi/asm/socket.h | 7 +-- arch/mips/include/uapi/asm/socket.h| 6 -- arch/parisc/include/uapi/asm/socket.h | 6 -- arch/powerpc/include/uapi/asm/socket.h | 4 ++-- arch/sparc/include/uapi/asm/socket.h | 6 -- fs/dlm/lowcomms.c | 4 ++-- include/net/sock.h | 4 ++-- include/uapi/asm-generic/socket.h | 6 -- net/compat.c | 4 ++-- net/core/sock.c| 8 10 files changed, 33 insertions(+), 22 deletions(-) diff --git a/arch/alpha/include/uapi/asm/socket.h b/arch/alpha/include/uapi/asm/socket.h index da08412bd49f..ea3ba981d8a0 100644 --- a/arch/alpha/include/uapi/asm/socket.h +++ b/arch/alpha/include/uapi/asm/socket.h @@ -31,8 +31,8 @@ #define SO_RCVBUFFORCE 0x100b #defineSO_RCVLOWAT 0x1010 #defineSO_SNDLOWAT 0x1011 -#defineSO_RCVTIMEO 0x1012 -#defineSO_SNDTIMEO 0x1013 +#defineSO_RCVTIMEO_OLD 0x1012 +#defineSO_SNDTIMEO_OLD 0x1013 #define SO_ACCEPTCONN 0x1014 #define SO_PROTOCOL0x1028 #define SO_DOMAIN 0x1029 @@ -120,6 +120,9 @@ #if !defined(__KERNEL__) +#defineSO_RCVTIMEO SO_RCVTIMEO_OLD +#defineSO_SNDTIMEO SO_SNDTIMEO_OLD + #if __BITS_PER_LONG == 64 #define SO_TIMESTAMP SO_TIMESTAMP_OLD #define SO_TIMESTAMPNS SO_TIMESTAMPNS_OLD diff --git a/arch/mips/include/uapi/asm/socket.h b/arch/mips/include/uapi/asm/socket.h index 1e48f67f1052..4dde20d64690 100644 --- a/arch/mips/include/uapi/asm/socket.h +++ b/arch/mips/include/uapi/asm/socket.h @@ -39,8 +39,8 @@ #define SO_RCVBUF 0x1002 /* Receive buffer. */ #define SO_SNDLOWAT0x1003 /* send low-water mark */ #define SO_RCVLOWAT0x1004 /* receive low-water mark */ -#define SO_SNDTIMEO0x1005 /* send timeout */ -#define SO_RCVTIMEO0x1006 /* receive timeout */ +#define SO_SNDTIMEO_OLD0x1005 /* send timeout */ +#define SO_RCVTIMEO_OLD0x1006 /* receive timeout */ #define SO_ACCEPTCONN 0x1009 #define SO_PROTOCOL0x1028 /* protocol type */ #define SO_DOMAIN 0x1029 /* domain/socket family */ @@ -130,6 +130,8 @@ #if !defined(__KERNEL__) +#defineSO_RCVTIMEO SO_RCVTIMEO_OLD +#defineSO_SNDTIMEO SO_SNDTIMEO_OLD #if __BITS_PER_LONG == 64 #define SO_TIMESTAMP SO_TIMESTAMP_OLD #define SO_TIMESTAMPNS SO_TIMESTAMPNS_OLD diff --git a/arch/parisc/include/uapi/asm/socket.h b/arch/parisc/include/uapi/asm/socket.h index e8d6cf20f9a4..546937fa0d8b 100644 --- a/arch/parisc/include/uapi/asm/socket.h +++ b/arch/parisc/include/uapi/asm/socket.h @@ -22,8 +22,8 @@ #define SO_RCVBUFFORCE 0x100b #define SO_SNDLOWAT0x1003 #define SO_RCVLOWAT0x1004 -#define SO_SNDTIMEO0x1005 -#define SO_RCVTIMEO0x1006 +#define SO_SNDTIMEO_OLD0x1005 +#define SO_RCVTIMEO_OLD0x1006 #define SO_ERROR 0x1007 #define SO_TYPE0x1008 #define SO_PROTOCOL0x1028 @@ -111,6 +111,8 @@ #if !defined(__KERNEL__) +#defineSO_RCVTIMEO SO_RCVTIMEO_OLD +#defineSO_SNDTIMEO SO_SNDTIMEO_OLD #if __BITS_PER_LONG == 64 #define SO_TIMESTAMP SO_TIMESTAMP_OLD #define SO_TIMESTAMPNS SO_TIMESTAMPNS_OLD diff --git a/arch/powerpc/include/uapi/asm/socket.h b/arch/powerpc/include/uapi/asm/socket.h index 94de465e0920..12aa0c43e775 100644 --- a/arch/powerpc/include/uapi/asm/socket.h +++ b/arch/powerpc/include/uapi/asm/socket.h @@ -11,8 +11,8 @@ #define SO_RCVLOWAT16 #define SO_SNDLOWAT17 -#define SO_RCVTIMEO18 -#define SO_SNDTIMEO19 +#define SO_RCVTIMEO_OLD18 +#define SO_SNDTIMEO_OLD19 #define SO_PASSCRED20 #define SO_PEERCRED21 diff --git a/arch/sparc/include/uapi/asm/socket.h b/arch/sparc/include/uapi/asm/socket.h index fc65bf6b6440..bdc396211627 100644 --- a/arch/sparc/include/uapi/asm/socket.h +++ b/arch/sparc/include/uapi/asm/socket.h @@ -21,8 +21,8 @@ #define SO_BSDCOMPAT0x0400 #define SO_RCVLOWAT 0x0800 #define SO_SNDLOWAT 0x1000 -#define SO_RCVTIMEO 0x2000 -#define SO_SNDTIMEO 0x4000 +#define SO_RCVTIMEO_OLD 0x2000 +#define SO_SNDTIMEO_OLD
