File 0040-linux-user-skip-0-flag-from-proc-se.patch of Package qemu

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File 0040-linux-user-skip-0-flag-from-proc-se.patch of Package qemu (Revision aaedfb3216f884a4a543fff885c3a882)

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From c591019f7c3d6d1ca45a8773313aeb5ffac686c2 Mon Sep 17 00:00:00 2001
From: Andreas Schwab <schwab@suse.de>
Date: Mon, 26 Sep 2016 10:08:59 +0200
Subject: [PATCH] linux-user: skip -0 flag from /proc/self/cmdline
MIME-Version: 1.0
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This removes the "-0 argv0" flag from /proc/self/cmdline that was passed in
by the qemu-ARCH-binfmt wrapper.

Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 linux-user/syscall.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 856e75d..9be99d6 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7014,7 +7014,7 @@ int host_to_target_waitstatus(int status)
 static int open_self_cmdline(void *cpu_env, int fd)
 {
     int fd_orig = -1;
-    bool word_skipped = false;
+    int skip_words = 3;
 
     fd_orig = open("/proc/self/cmdline", O_RDONLY);
     if (fd_orig < 0) {
@@ -7036,19 +7036,29 @@ static int open_self_cmdline(void *cpu_env, int fd)
             break;
         }
 
-        if (!word_skipped) {
+        while (skip_words) {
             /* Skip the first string, which is the path to qemu-*-static
                instead of the actual command. */
-            cp_buf = memchr(buf, 0, nb_read);
+            char *p = cp_buf;
+            cp_buf = memchr(p, 0, nb_read);
             if (cp_buf) {
                 /* Null byte found, skip one string */
                 cp_buf++;
-                nb_read -= cp_buf - buf;
-                word_skipped = true;
+                nb_read -= cp_buf - p;
+                skip_words--;
+                if (skip_words == 2) {
+                    /* Check for presence of -0 flag.  */
+                    if (nb_read > 0 && cp_buf[0] != '-' ||
+                        nb_read > 1 && cp_buf[1] != '0') {
+                        skip_words = 0;
+                    }
+                }
+            } else {
+                break;
             }
         }
 
-        if (word_skipped) {
+        if (skip_words == 0) {
             if (write(fd, cp_buf, nb_read) != nb_read) {
                 int e = errno;
                 close(fd_orig);

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File 0040-linux-user-skip-0-flag-from-proc-se.patch of Package qemu (Revision aaedfb3216f884a4a543fff885c3a882)

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