[Qemu-devel] [PATCH v6] linux-user: fix to handle variably sized SIOCGSTAMP with new kernels

* [Qemu-devel] [PATCH v6] linux-user: fix to handle variably sized SIOCGSTAMP with new kernels
@ 2019-07-18 13:06 Laurent Vivier
  2019-07-19  7:26 ` Christian Borntraeger
  0 siblings, 1 reply; 2+ messages in thread
From: Laurent Vivier @ 2019-07-18 13:06 UTC (permalink / raw)
  To: qemu-devel
  Cc: Peter Maydell, Daniel P . Berrangé,
	Arnd Bergmann, Gerhard Stenzel, Riku Voipio, Richard Henderson,
	Laurent Vivier, Christian Ehrhardt, Christian Borntraeger

From: 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 convert the old and new type from
the target to the host one.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
---

Notes:
    v6: [lv] fix IOCTLEntry entries (host_cmd and name)
    v5: [lv] define special _OLD values for sh
        define special case for SPARC64
        define ioctl helpers
        define target__kernel_sock_timeval and target__kernel_timespec and
        converters to the host type
        always use SIOCGSTAMP and SIOCGSTAMPNS on the host
    
    v4: [lv] timeval64 and timespec64 are { long long , long }
    
    v3: [lv] redefine TARGET_SIOCGSTAMP_NEW, TARGET_SIOCGSTAMPNS_NEW,
        timeval64 and timespec64 to use 0x89 type and abi_llong[2]
    
    v2: [dpb] implement _NEW and _OLD variants

 linux-user/ioctls.h        |  21 +++++-
 linux-user/syscall.c       | 140 +++++++++++++++++++++++++++++--------
 linux-user/syscall_defs.h  |  30 +++++++-
 linux-user/syscall_types.h |   6 --
 4 files changed, 159 insertions(+), 38 deletions(-)

diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index 5e84dc7c3a77..3281c97ca263 100644
--- a/linux-user/ioctls.h
+++ b/linux-user/ioctls.h
@@ -222,8 +222,25 @@
   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 */
-  IOCTL(SIOCGSTAMP, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timeval)))
-  IOCTL(SIOCGSTAMPNS, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timespec)))
+
+  /*
+   * We can't use IOCTL_SPECIAL() because it will set
+   * host_cmd to XXX_OLD and XXX_NEW and these macros
+   * are not defined with kernel prior to 5.2.
+   * We must set host_cmd to the same value as in target_cmd
+   * otherwise the consistency check in syscall_init()
+   * will trigger an error.
+   * host_cmd is ignored by the do_ioctl_XXX() helpers.
+   * FIXME: create a macro to define this kind of entry
+   */
+  { TARGET_SIOCGSTAMP_OLD, TARGET_SIOCGSTAMP_OLD,
+    "SIOCGSTAMP_OLD", IOC_R, do_ioctl_SIOCGSTAMP },
+  { TARGET_SIOCGSTAMPNS_OLD, TARGET_SIOCGSTAMPNS_OLD,
+    "SIOCGSTAMPNS_OLD", IOC_R, do_ioctl_SIOCGSTAMPNS },
+  { TARGET_SIOCGSTAMP_NEW, TARGET_SIOCGSTAMP_NEW,
+    "SIOCGSTAMP_NEW", IOC_R, do_ioctl_SIOCGSTAMP },
+  { TARGET_SIOCGSTAMPNS_NEW, TARGET_SIOCGSTAMPNS_NEW,
+    "SIOCGSTAMPNS_NEW", IOC_R, do_ioctl_SIOCGSTAMPNS },
 
   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 39a37496fed5..8367cb138dfe 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>
@@ -1126,8 +1127,9 @@ static inline abi_long copy_from_user_timeval(struct timeval *tv,
 {
     struct target_timeval *target_tv;
 
-    if (!lock_user_struct(VERIFY_READ, target_tv, target_tv_addr, 1))
+    if (!lock_user_struct(VERIFY_READ, target_tv, target_tv_addr, 1)) {
         return -TARGET_EFAULT;
+    }
 
     __get_user(tv->tv_sec, &target_tv->tv_sec);
     __get_user(tv->tv_usec, &target_tv->tv_usec);
@@ -1142,8 +1144,26 @@ static inline abi_long copy_to_user_timeval(abi_ulong target_tv_addr,
 {
     struct target_timeval *target_tv;
 
-    if (!lock_user_struct(VERIFY_WRITE, target_tv, target_tv_addr, 0))
+    if (!lock_user_struct(VERIFY_WRITE, target_tv, target_tv_addr, 0)) {
+        return -TARGET_EFAULT;
+    }
+
+    __put_user(tv->tv_sec, &target_tv->tv_sec);
+    __put_user(tv->tv_usec, &target_tv->tv_usec);
+
+    unlock_user_struct(target_tv, target_tv_addr, 1);
+
+    return 0;
+}
+
+static inline abi_long copy_to_user_timeval64(abi_ulong target_tv_addr,
+                                             const struct timeval *tv)
+{
+    struct target__kernel_sock_timeval *target_tv;
+
+    if (!lock_user_struct(VERIFY_WRITE, target_tv, target_tv_addr, 0)) {
         return -TARGET_EFAULT;
+    }
 
     __put_user(tv->tv_sec, &target_tv->tv_sec);
     __put_user(tv->tv_usec, &target_tv->tv_usec);
@@ -1153,6 +1173,48 @@ static inline abi_long copy_to_user_timeval(abi_ulong target_tv_addr,
     return 0;
 }
 
+static inline abi_long target_to_host_timespec(struct timespec *host_ts,
+                                               abi_ulong target_addr)
+{
+    struct target_timespec *target_ts;
+
+    if (!lock_user_struct(VERIFY_READ, target_ts, target_addr, 1)) {
+        return -TARGET_EFAULT;
+    }
+    __get_user(host_ts->tv_sec, &target_ts->tv_sec);
+    __get_user(host_ts->tv_nsec, &target_ts->tv_nsec);
+    unlock_user_struct(target_ts, target_addr, 0);
+    return 0;
+}
+
+static inline abi_long host_to_target_timespec(abi_ulong target_addr,
+                                               struct timespec *host_ts)
+{
+    struct target_timespec *target_ts;
+
+    if (!lock_user_struct(VERIFY_WRITE, target_ts, target_addr, 0)) {
+        return -TARGET_EFAULT;
+    }
+    __put_user(host_ts->tv_sec, &target_ts->tv_sec);
+    __put_user(host_ts->tv_nsec, &target_ts->tv_nsec);
+    unlock_user_struct(target_ts, target_addr, 1);
+    return 0;
+}
+
+static inline abi_long host_to_target_timespec64(abi_ulong target_addr,
+                                                 struct timespec *host_ts)
+{
+    struct target__kernel_timespec *target_ts;
+
+    if (!lock_user_struct(VERIFY_WRITE, target_ts, target_addr, 0)) {
+        return -TARGET_EFAULT;
+    }
+    __put_user(host_ts->tv_sec, &target_ts->tv_sec);
+    __put_user(host_ts->tv_nsec, &target_ts->tv_nsec);
+    unlock_user_struct(target_ts, target_addr, 1);
+    return 0;
+}
+
 static inline abi_long copy_from_user_timezone(struct timezone *tz,
                                                abi_ulong target_tz_addr)
 {
@@ -4899,6 +4961,54 @@ static abi_long do_ioctl_kdsigaccept(const IOCTLEntry *ie, uint8_t *buf_temp,
     return get_errno(safe_ioctl(fd, ie->host_cmd, sig));
 }
 
+static abi_long do_ioctl_SIOCGSTAMP(const IOCTLEntry *ie, uint8_t *buf_temp,
+                                    int fd, int cmd, abi_long arg)
+{
+    struct timeval tv;
+    abi_long ret;
+
+    ret = get_errno(safe_ioctl(fd, SIOCGSTAMP, &tv));
+    if (is_error(ret)) {
+        return ret;
+    }
+
+    if (cmd == (int)TARGET_SIOCGSTAMP_OLD) {
+        if (copy_to_user_timeval(arg, &tv)) {
+            return -TARGET_EFAULT;
+        }
+    } else {
+        if (copy_to_user_timeval64(arg, &tv)) {
+            return -TARGET_EFAULT;
+        }
+    }
+
+    return ret;
+}
+
+static abi_long do_ioctl_SIOCGSTAMPNS(const IOCTLEntry *ie, uint8_t *buf_temp,
+                                      int fd, int cmd, abi_long arg)
+{
+    struct timespec ts;
+    abi_long ret;
+
+    ret = get_errno(safe_ioctl(fd, SIOCGSTAMPNS, &ts));
+    if (is_error(ret)) {
+        return ret;
+    }
+
+    if (cmd == (int)TARGET_SIOCGSTAMPNS_OLD) {
+        if (host_to_target_timespec(arg, &ts)) {
+            return -TARGET_EFAULT;
+        }
+    } else{
+        if (host_to_target_timespec64(arg, &ts)) {
+            return -TARGET_EFAULT;
+        }
+    }
+
+    return ret;
+}
+
 #ifdef TIOCGPTPEER
 static abi_long do_ioctl_tiocgptpeer(const IOCTLEntry *ie, uint8_t *buf_temp,
                                      int fd, int cmd, abi_long arg)
@@ -6271,32 +6381,6 @@ static inline abi_long target_ftruncate64(void *cpu_env, abi_long arg1,
 }
 #endif
 
-static inline abi_long target_to_host_timespec(struct timespec *host_ts,
-                                               abi_ulong target_addr)
-{
-    struct target_timespec *target_ts;
-
-    if (!lock_user_struct(VERIFY_READ, target_ts, target_addr, 1))
-        return -TARGET_EFAULT;
-    __get_user(host_ts->tv_sec, &target_ts->tv_sec);
-    __get_user(host_ts->tv_nsec, &target_ts->tv_nsec);
-    unlock_user_struct(target_ts, target_addr, 0);
-    return 0;
-}
-
-static inline abi_long host_to_target_timespec(abi_ulong target_addr,
-                                               struct timespec *host_ts)
-{
-    struct target_timespec *target_ts;
-
-    if (!lock_user_struct(VERIFY_WRITE, target_ts, target_addr, 0))
-        return -TARGET_EFAULT;
-    __put_user(host_ts->tv_sec, &target_ts->tv_sec);
-    __put_user(host_ts->tv_nsec, &target_ts->tv_nsec);
-    unlock_user_struct(target_ts, target_addr, 1);
-    return 0;
-}
-
 static inline abi_long target_to_host_itimerspec(struct itimerspec *host_itspec,
                                                  abi_ulong target_addr)
 {
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index fffa89f2564b..06622703008a 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -209,16 +209,34 @@ struct target_linger {
     abi_int l_linger;       /* How long to linger for       */
 };
 
+#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
+struct target_timeval {
+    abi_long tv_sec;
+    abi_int tv_usec;
+};
+#define target__kernel_sock_timeval target_timeval
+#else
 struct target_timeval {
     abi_long tv_sec;
     abi_long tv_usec;
 };
 
+struct target__kernel_sock_timeval {
+    abi_llong tv_sec;
+    abi_llong tv_usec;
+};
+#endif
+
 struct target_timespec {
     abi_long tv_sec;
     abi_long tv_nsec;
 };
 
+struct target__kernel_timespec {
+    abi_llong tv_sec;
+    abi_llong tv_nsec;
+};
+
 struct target_timezone {
     abi_int tz_minuteswest;
     abi_int tz_dsttime;
@@ -749,8 +767,16 @@ struct target_pollfd {
 #define TARGET_SIOCGPGRP       0x8904
 #endif
 
-#define TARGET_SIOCGSTAMP      0x8906          /* Get stamp (timeval) */
-#define TARGET_SIOCGSTAMPNS    0x8907          /* Get stamp (timespec) */
+#if defined(TARGET_SH4)
+#define TARGET_SIOCGSTAMP_OLD   TARGET_IOR('s', 100, struct target_timeval)
+#define TARGET_SIOCGSTAMPNS_OLD TARGET_IOR('s', 101, struct target_timespec)
+#else
+#define TARGET_SIOCGSTAMP_OLD   0x8906
+#define TARGET_SIOCGSTAMPNS_OLD 0x8907
+#endif
+
+#define TARGET_SIOCGSTAMP_NEW   TARGET_IOR(0x89, 0x06, abi_llong[2])
+#define TARGET_SIOCGSTAMPNS_NEW TARGET_IOR(0x89, 0x07, abi_llong[2])
 
 /* 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 b98a23b0f1b0..4e3698382629 100644
--- a/linux-user/syscall_types.h
+++ b/linux-user/syscall_types.h
@@ -14,12 +14,6 @@ STRUCT(serial_icounter_struct,
 STRUCT(sockaddr,
        TYPE_SHORT, MK_ARRAY(TYPE_CHAR, 14))
 
-STRUCT(timeval,
-       MK_ARRAY(TYPE_LONG, 2))
-
-STRUCT(timespec,
-       MK_ARRAY(TYPE_LONG, 2))
-
 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



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