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Re: [Qemu-devel] [PATCH v2] linux-user: fix to handle variably sized SIO


From: Laurent Vivier
Subject: Re: [Qemu-devel] [PATCH v2] linux-user: fix to handle variably sized SIOCGSTAMP with new kernels
Date: Mon, 17 Jun 2019 16:43:57 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0

Le 17/06/2019 à 15:11, Daniel P. Berrangé a écrit :
> The SIOCGSTAMP symbol was previously defined in the
> asm-generic/sockios.h header file. QEMU sees that header
> indirectly via sys/socket.h
> 
> In linux kernel commit 0768e17073dc527ccd18ed5f96ce85f9985e9115
> the asm-generic/sockios.h header no longer defines SIOCGSTAMP.
> Instead it provides only SIOCGSTAMP_OLD, which only uses a
> 32-bit time_t on 32-bit architectures.
> 
> The linux/sockios.h header then defines SIOCGSTAMP using
> either SIOCGSTAMP_OLD or SIOCGSTAMP_NEW as appropriate. If
> SIOCGSTAMP_NEW is used, then the tv_sec field is 64-bit even
> on 32-bit architectures
> 
> To cope with this we must now define two separate syscalls,
> with corresponding old and new sizes, as well as including
> the new linux/sockios.h header.
> 
> Signed-off-by: Daniel P. Berrangé <address@hidden>
> ---
>  linux-user/ioctls.h        | 15 +++++++++++++++
>  linux-user/syscall.c       |  1 +
>  linux-user/syscall_defs.h  |  5 +++++
>  linux-user/syscall_types.h |  4 ++++
>  4 files changed, 25 insertions(+)
> 
> diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
> index 5e84dc7c3a..5a6d6def7e 100644
> --- a/linux-user/ioctls.h
> +++ b/linux-user/ioctls.h
> @@ -222,8 +222,23 @@
>    IOCTL(SIOCGIWNAME, IOC_W | IOC_R, MK_PTR(MK_STRUCT(STRUCT_char_ifreq)))
>    IOCTL(SIOCSPGRP, IOC_W, MK_PTR(TYPE_INT)) /* pid_t */
>    IOCTL(SIOCGPGRP, IOC_R, MK_PTR(TYPE_INT)) /* pid_t */
> +
> +#ifdef SIOCGSTAMP_OLD
> +  IOCTL(SIOCGSTAMP_OLD, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timeval)))
> +#else
>    IOCTL(SIOCGSTAMP, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timeval)))
> +#endif
> +#ifdef SIOCGSTAMPNS_OLD
> +  IOCTL(SIOCGSTAMPNS_OLD, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timespec)))
> +#else
>    IOCTL(SIOCGSTAMPNS, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timespec)))
> +#endif
> +#ifdef SIOCGSTAMP_NEW
> +  IOCTL(SIOCGSTAMP_NEW, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timeval64)))
> +#endif
> +#ifdef SIOCGSTAMPNS_NEW
> +  IOCTL(SIOCGSTAMPNS_NEW, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timespec64)))
> +#endif
>  
>    IOCTL(RNDGETENTCNT, IOC_R, MK_PTR(TYPE_INT))
>    IOCTL(RNDADDTOENTCNT, IOC_W, MK_PTR(TYPE_INT))
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index b187c1281d..f13e260b02 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -37,6 +37,7 @@
>  #include <sched.h>
>  #include <sys/timex.h>
>  #include <sys/socket.h>
> +#include <linux/sockios.h>
>  #include <sys/un.h>
>  #include <sys/uio.h>
>  #include <poll.h>
> diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
> index 7f141f699c..7830b600e7 100644
> --- a/linux-user/syscall_defs.h
> +++ b/linux-user/syscall_defs.h
> @@ -750,6 +750,11 @@ struct target_pollfd {
>  
>  #define TARGET_SIOCGSTAMP      0x8906          /* Get stamp (timeval) */
>  #define TARGET_SIOCGSTAMPNS    0x8907          /* Get stamp (timespec) */
> +#define TARGET_SIOCGSTAMP_OLD   0x8906          /* Get stamp (timeval) */
> +#define TARGET_SIOCGSTAMPNS_OLD 0x8907          /* Get stamp (timespec) */
> +#define TARGET_SIOCGSTAMP_NEW   TARGET_IOC(TARGET_IOC_READ, 's', 6, 
> sizeof(long long) + sizeof(long)) /* Get stamp (timeval64) */
> +#define TARGET_SIOCGSTAMPNS_NEW TARGET_IOC(TARGET_IOC_READ, 's', 7, 
> sizeof(long long) + sizeof(long)) /* Get stamp (timespec64) */
kernel defines:

#define SIOCGSTAMP_NEW   _IOR(SOCK_IOC_TYPE, 0x06, long long[2])
#define SIOCGSTAMPNS_NEW _IOR(SOCK_IOC_TYPE, 0x07, long long[2])

So it should be TARGET_IOR(0x89, 0x6, abi_llong[2])

Their codes are 0x80108906 and 80108907.

Thanks,
Laurent



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