File 0054-linux-user-make-pwrite64-pread64-fd.patch of Package qemu

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File 0054-linux-user-make-pwrite64-pread64-fd.patch of Package qemu (Revision 8fe809d37db57d2ef59cc0885c99b045)

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From: Peter Maydell <peter.maydell@linaro.org>
Date: Tue, 8 Jan 2019 18:49:00 +0000
Subject: linux-user: make pwrite64/pread64(fd, NULL, 0, offset) return 0
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Linux returns success if pwrite64() or pread64() are called with a
zero length NULL buffer, but QEMU was returning -TARGET_EFAULT.

This is the same bug that we fixed in commit 58cfa6c2e6eb51b23cc9
for the write syscall, and long before that in 38d840e6790c29f59
for the read syscall.

Fixes: https://bugs.launchpad.net/qemu/+bug/1810433

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190108184900.9654-1-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
(cherry picked from commit 2bd3f8998e1e7dcd9afc29fab252fb9936f9e956)
[LY: BSC#1121600]
Signed-off-by: Liang Yan <lyan@suse.com>
---
 linux-user/syscall.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index d978c67d6b..4d3b98c6f7 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -9723,8 +9723,15 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_ulong arg1,
             arg4 = arg5;
             arg5 = arg6;
         }
-        if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
-            return -TARGET_EFAULT;
+        if (arg2 == 0 && arg3 == 0) {
+            /* Special-case NULL buffer and zero length, which should succeed */
+            p = 0;
+        } else {
+            p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
+            if (!p) {
+                return -TARGET_EFAULT;
+            }
+        }
         ret = get_errno(pread64(arg1, p, arg3, target_offset64(arg4, arg5)));
         unlock_user(p, arg2, ret);
         return ret;
@@ -9733,8 +9740,15 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_ulong arg1,
             arg4 = arg5;
             arg5 = arg6;
         }
-        if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
-            return -TARGET_EFAULT;
+        if (arg2 == 0 && arg3 == 0) {
+            /* Special-case NULL buffer and zero length, which should succeed */
+            p = 0;
+        } else {
+            p = lock_user(VERIFY_READ, arg2, arg3, 1);
+            if (!p) {
+                return -TARGET_EFAULT;
+            }
+        }
         ret = get_errno(pwrite64(arg1, p, arg3, target_offset64(arg4, arg5)));
         unlock_user(p, arg2, 0);
         return ret;

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File 0054-linux-user-make-pwrite64-pread64-fd.patch of Package qemu (Revision 8fe809d37db57d2ef59cc0885c99b045)

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