File 0104-linux-user-write-fd-NULL-0-parity-w.patch of Package qemu-testsuite.20749

From: Tony Garnock-Jones <tony.garnock-jones@glasgow.ac.uk>
Date: Sat, 8 Sep 2018 19:22:05 +0100
Subject: linux-user: write(fd, NULL, 0) parity with linux's treatment of same
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Bring linux-user write(2) handling into line with linux for the case
of a 0-byte write with a NULL buffer. Based on a patch originally
written by Zhuowei Zhang.

Addresses https://bugs.launchpad.net/qemu/+bug/1716292.

>From Zhuowei Zhang's patch (https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg08073.html):

    Linux returns success for the special case of calling write with a
    zero-length NULL buffer: compiling and running

    int main() {
       ssize_t ret = write(STDOUT_FILENO, NULL, 0);
       fprintf(stderr, "write returned %ld\n", ret);
       return 0;
    }

    gives "write returned 0" when run directly, but "write returned
    -1" in QEMU.

    This commit checks for this situation and returns success if
    found.

Subsequent discussion raised the following questions (and my answers):

 - Q. Should TARGET_NR_read pass through to safe_read in this
      situation too?
   A. I'm wary of changing unrelated code to the specific problem I'm
      addressing. TARGET_NR_read is already consistent with Linux for
      this case.

 - Q. Do pread64/pwrite64 need to be changed similarly?
   A. Experiment suggests not: both linux and linux-user yield -1 for
      NULL 0-length reads/writes.

Signed-off-by: Tony Garnock-Jones <tonygarnockjones@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180908182205.GB409@mornington.dcs.gla.ac.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
(cherry picked from commit 58cfa6c2e6eb51b23cc98f81d16136b3ca929b31)
[LY: BSC#1121600]
Signed-off-by: Liang Yan <lyan@suse.com>
---
 linux-user/syscall.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index f6452a89c0ddc455d244074a7a63..9d8b06c2f109086873972d9c85a5 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7855,6 +7855,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_ulong arg1,
         }
         break;
     case TARGET_NR_write:
+        if (arg2 == 0 && arg3 == 0) {
+            return get_errno(safe_write(arg1, 0, 0));
+        }
         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
             goto efault;
         if (fd_trans_target_to_host_data(arg1)) {