[Qemu-devel] [PATCH v2] linux-user: fix to handle variably sized SIOCGSTAMP with new kernels

["Daniel P. Berrangé" <berrange@redhat.com>]

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 <berrange@redhat.com>
---
 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) */
+
 
 /* Networking ioctls */
 #define TARGET_SIOCADDRT       0x890B          /* add routing table entry */
diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h
index b98a23b0f1..de4c5a5b6f 100644
--- a/linux-user/syscall_types.h
+++ b/linux-user/syscall_types.h
@@ -20,6 +20,10 @@ STRUCT(timeval,
 STRUCT(timespec,
        MK_ARRAY(TYPE_LONG, 2))
 
+STRUCT(timeval64, TYPE_LONGLONG, TYPE_LONG)
+
+STRUCT(timespec64, TYPE_LONGLONG, TYPE_LONG)
+
 STRUCT(rtentry,
        TYPE_ULONG, MK_STRUCT(STRUCT_sockaddr), MK_STRUCT(STRUCT_sockaddr), MK_STRUCT(STRUCT_sockaddr),
        TYPE_SHORT, TYPE_SHORT, TYPE_ULONG, TYPE_PTRVOID, TYPE_SHORT, TYPE_PTRVOID,
-- 
2.21.0