commit 435da5e7092aa54e12044b9401b42c4a9333c74d
author Peter Maydell <peter.maydell@linaro.org> Mon Jun 13 11:22:05 2016 +0100
committer Riku Voipio <riku.voipio@linaro.org> Sun Jun 26 13:17:20 2016 +0300
tree c50efa56bc6ca7d44ab10137be7924576240a16c
parent 213d3e9ea27f7fc55db7272c05255294b52ed3e4

linux-user: Use safe_syscall wrapper for fcntl

Use the safe_syscall wrapper for fcntl. This is straightforward now
that we always use 'struct fcntl64' on the host, as we don't need
to select whether to call the host's fcntl64 or fcntl syscall
(a detail that the libc previously hid for us).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>

linux-user/syscall.c

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 5c0d111..3dfaea9 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -783,6 +783,16 @@
  * the libc function.
  */
 #define safe_ioctl(...) safe_syscall(__NR_ioctl, __VA_ARGS__)
+/* Similarly for fcntl. Note that callers must always:
+ *  pass the F_GETLK64 etc constants rather than the unsuffixed F_GETLK
+ *  use the flock64 struct rather than unsuffixed flock
+ * This will then work and use a 64-bit offset for both 32-bit and 64-bit hosts.
+ */
+#ifdef __NR_fcntl64
+#define safe_fcntl(...) safe_syscall(__NR_fcntl64, __VA_ARGS__)
+#else
+#define safe_fcntl(...) safe_syscall(__NR_fcntl, __VA_ARGS__)
+#endif
 
 static inline int host_to_target_sock_type(int host_type)
 {
@@ -5740,7 +5750,7 @@
         if (ret) {
             return ret;
         }
-        ret = get_errno(fcntl(fd, host_cmd, &fl64));
+        ret = get_errno(safe_fcntl(fd, host_cmd, &fl64));
         if (ret == 0) {
             ret = copy_to_user_flock(arg, &fl64);
         }
@@ -5752,7 +5762,7 @@
         if (ret) {
             return ret;
         }
-        ret = get_errno(fcntl(fd, host_cmd, &fl64));
+        ret = get_errno(safe_fcntl(fd, host_cmd, &fl64));
         break;
 
     case TARGET_F_GETLK64:
@@ -5760,7 +5770,7 @@
         if (ret) {
             return ret;
         }
-        ret = get_errno(fcntl(fd, host_cmd, &fl64));
+        ret = get_errno(safe_fcntl(fd, host_cmd, &fl64));
         if (ret == 0) {
             ret = copy_to_user_flock64(arg, &fl64);
         }
@@ -5771,23 +5781,25 @@
         if (ret) {
             return ret;
         }
-        ret = get_errno(fcntl(fd, host_cmd, &fl64));
+        ret = get_errno(safe_fcntl(fd, host_cmd, &fl64));
         break;
 
     case TARGET_F_GETFL:
-        ret = get_errno(fcntl(fd, host_cmd, arg));
+        ret = get_errno(safe_fcntl(fd, host_cmd, arg));
         if (ret >= 0) {
             ret = host_to_target_bitmask(ret, fcntl_flags_tbl);
         }
         break;
 
     case TARGET_F_SETFL:
-        ret = get_errno(fcntl(fd, host_cmd, target_to_host_bitmask(arg, fcntl_flags_tbl)));
+        ret = get_errno(safe_fcntl(fd, host_cmd,
+                                   target_to_host_bitmask(arg,
+                                                          fcntl_flags_tbl)));
         break;
 
 #ifdef F_GETOWN_EX
     case TARGET_F_GETOWN_EX:
-        ret = get_errno(fcntl(fd, host_cmd, &fox));
+        ret = get_errno(safe_fcntl(fd, host_cmd, &fox));
         if (ret >= 0) {
             if (!lock_user_struct(VERIFY_WRITE, target_fox, arg, 0))
                 return -TARGET_EFAULT;
@@ -5805,7 +5817,7 @@
         fox.type = tswap32(target_fox->type);
         fox.pid = tswap32(target_fox->pid);
         unlock_user_struct(target_fox, arg, 0);
-        ret = get_errno(fcntl(fd, host_cmd, &fox));
+        ret = get_errno(safe_fcntl(fd, host_cmd, &fox));
         break;
 #endif
 
@@ -5815,11 +5827,11 @@
     case TARGET_F_GETSIG:
     case TARGET_F_SETLEASE:
     case TARGET_F_GETLEASE:
-        ret = get_errno(fcntl(fd, host_cmd, arg));
+        ret = get_errno(safe_fcntl(fd, host_cmd, arg));
         break;
 
     default:
-        ret = get_errno(fcntl(fd, cmd, arg));
+        ret = get_errno(safe_fcntl(fd, cmd, arg));
         break;
     }
     return ret;
@@ -10252,7 +10264,7 @@
             if (ret) {
                 break;
             }
-            ret = get_errno(fcntl(arg1, cmd, &fl));
+            ret = get_errno(safe_fcntl(arg1, cmd, &fl));
 	    break;
         default:
             ret = do_fcntl(arg1, arg2, arg3);