Blame 0001-VBoxServiceAutoMount-Change-Linux-mount-code-to-use-.patch

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From 369dd2ee3c82c4417fee04aeec933c74fd198e78 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Tue, 23 Jan 2018 15:09:20 +0100
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Subject: [PATCH resend] VBoxServiceAutoMount: Change Linux mount code to use
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 an options string
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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 .../common/VBoxService/VBoxServiceAutoMount.cpp    | 62 +++-------------------
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 1 file changed, 8 insertions(+), 54 deletions(-)
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diff --git a/src/VBox/Additions/common/VBoxService/VBoxServiceAutoMount.cpp b/src/VBox/Additions/common/VBoxService/VBoxServiceAutoMount.cpp
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--- ./src/VBox/Additions/common/VBoxService/VBoxServiceAutoMount.cpp.orig	2019-04-16 11:09:11.000000000 +0100
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+++ ./src/VBox/Additions/common/VBoxService/VBoxServiceAutoMount.cpp	2019-04-26 17:10:47.178485356 +0100
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@@ -40,6 +40,7 @@
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 #include <iprt/ctype.h>
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 #include <iprt/dir.h>
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 #include <iprt/mem.h>
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+#include <iprt/param.h>
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 #include <iprt/path.h>
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 #include <iprt/semaphore.h>
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 #include <iprt/sort.h>
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@@ -114,6 +115,9 @@ RT_C_DECLS_END
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 # define VBOXSERVICE_AUTOMOUNT_MIQF             SHFL_MIQF_PATH
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 #endif
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+#ifndef MAX_MNTOPT_STR
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+#define MAX_MNTOPT_STR PAGE_SIZE
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+#endif
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 /*********************************************************************************************************************************
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 *   Structures and Typedefs                                                                                                      *
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@@ -400,13 +399,13 @@ static int vbsvcAutoMountSharedFolderOld
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     int rc = vbsvcAutoMountPrepareMountPointOld(pszMountPoint, pszShareName, &Opts);
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     if (RT_SUCCESS(rc))
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     {
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+        char szOptBuf[MAX_MNTOPT_STR] = { '\0', };
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+        RTStrPrintf(szOptBuf, sizeof(szOptBuf), "uid=%d,gid=%d,dmode=%0o,fmode=%0o,dmask=%0o,fmask=%0o",
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+                    Opts.uid, Opts.gid, Opts.dmode, Opts.fmode, Opts.dmask, Opts.fmask);
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 # ifdef RT_OS_SOLARIS
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         int fFlags = 0;
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         if (Opts.ronly)
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             fFlags |= MS_RDONLY;
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-        char szOptBuf[MAX_MNTOPT_STR] = { '\0', };
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-        RTStrPrintf(szOptBuf, sizeof(szOptBuf), "uid=%d,gid=%d,dmode=%0o,fmode=%0o,dmask=%0o,fmask=%0o",
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-                    Opts.uid, Opts.gid, Opts.dmode, Opts.fmode, Opts.dmask, Opts.fmask);
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         int r = mount(pszShareName,
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                       pszMountPoint,
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                       fFlags | MS_OPTIONSTR,
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@@ -423,35 +422,11 @@ static int vbsvcAutoMountSharedFolderOld
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 # else /* RT_OS_LINUX */
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         unsigned long fFlags = MS_NODEV;
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-
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-        /*const char *szOptions = { "rw" }; - ??? */
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-        struct vbsf_mount_info_new mntinf;
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-        RT_ZERO(mntinf);
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-
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-        mntinf.nullchar     = '\0';
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-        mntinf.signature[0] = VBSF_MOUNT_SIGNATURE_BYTE_0;
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-        mntinf.signature[1] = VBSF_MOUNT_SIGNATURE_BYTE_1;
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-        mntinf.signature[2] = VBSF_MOUNT_SIGNATURE_BYTE_2;
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-        mntinf.length       = sizeof(mntinf);
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-
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-        mntinf.uid   = Opts.uid;
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-        mntinf.gid   = Opts.gid;
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-        mntinf.ttl   = Opts.ttl;
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-        mntinf.dmode = Opts.dmode;
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-        mntinf.fmode = Opts.fmode;
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-        mntinf.dmask = Opts.dmask;
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-        mntinf.fmask = Opts.fmask;
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-        mntinf.cMaxIoPages = Opts.cMaxIoPages;
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-        mntinf.szTag[0] = '\0';
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-
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-        strcpy(mntinf.name, pszShareName);
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-        strcpy(mntinf.nls_name, "\0");
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-
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         int r = mount(pszShareName,
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                       pszMountPoint,
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                       "vboxsf",
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                       fFlags,
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-                      &mntinf);
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+                      szOptBuf);
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         if (r == 0)
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         {
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             VGSvcVerbose(0, "vbsvcAutoMountWorker: Shared folder '%s' was mounted to '%s'\n", pszShareName, pszMountPoint);
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@@ -484,34 +459,6 @@ static int vbsvcAutoMountSharedFolderOld
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         }
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         else /* r == -1, we got some error in errno.  */
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         {
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-            if (errno == EPROTO)
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-            {
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-                VGSvcVerbose(3, "vbsvcAutoMountWorker: Messed up share name, re-trying ...\n");
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-
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-                /** @todo r=bird: What on earth is going on here?????  Why can't you
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-                 *        strcpy(mntinf.name, pszShareName) to fix it again? */
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-
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-                /* Sometimes the mount utility messes up the share name.  Try to
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-                 * un-mangle it again. */
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-                char szCWD[RTPATH_MAX];
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-                size_t cchCWD;
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-                if (!getcwd(szCWD, sizeof(szCWD)))
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-                {
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-                    VGSvcError("vbsvcAutoMountWorker: Failed to get the current working directory\n");
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-                    szCWD[0] = '\0';
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-                }
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-                cchCWD = strlen(szCWD);
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-                if (!strncmp(pszMountPoint, szCWD, cchCWD))
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-                {
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-                    while (pszMountPoint[cchCWD] == '/')
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-                        ++cchCWD;
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-                    /* We checked before that we have enough space */
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-                    strcpy(mntinf.name, pszMountPoint + cchCWD);
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-                }
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-                r = mount(mntinf.name, pszMountPoint, "vboxsf", fFlags, &mntinf);
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-            }
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-            if (r == -1) /* Was there some error from one of the tries above? */
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-            {
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                 switch (errno)
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                 {
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                     /* If we get EINVAL here, the system already has mounted the Shared Folder to another
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@@ -530,7 +477,6 @@ static int vbsvcAutoMountSharedFolderOld
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                         rc = RTErrConvertFromErrno(errno);
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                         break;
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                 }
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-            }
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         }
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 # endif
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     }
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@@ -1464,51 +1410,21 @@ static int vbsvcAutomounterMountIt(PVBSV
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     }
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 #  if defined(RT_OS_LINUX)
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-    /*
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-     * Linux a bit more work...
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-     */
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-    struct vbsf_mount_info_new MntInfo;
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-    RT_ZERO(MntInfo);
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-    struct vbsf_mount_opts MntOpts;
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-    RT_ZERO(MntOpts);
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-    MntInfo.nullchar     = '\0';
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-    MntInfo.signature[0] = VBSF_MOUNT_SIGNATURE_BYTE_0;
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-    MntInfo.signature[1] = VBSF_MOUNT_SIGNATURE_BYTE_1;
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-    MntInfo.signature[2] = VBSF_MOUNT_SIGNATURE_BYTE_2;
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-    MntInfo.length       = sizeof(MntInfo);
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-    MntInfo.ttl          = MntOpts.ttl              = -1 /*default*/;
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-    MntInfo.msDirCacheTTL= MntOpts.msDirCacheTTL    = -1 /*default*/;
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-    MntInfo.msInodeTTL   = MntOpts.msInodeTTL       = -1 /*default*/;
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-    MntInfo.cMaxIoPages  = MntOpts.cMaxIoPages      = 0 /*default*/;
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-    MntInfo.cbDirBuf     = MntOpts.cbDirBuf         = 0 /*default*/;
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-    MntInfo.enmCacheMode = MntOpts.enmCacheMode     = kVbsfCacheMode_Default;
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-    MntInfo.uid          = MntOpts.uid   = 0;
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-    MntInfo.gid          = MntOpts.gid   = gidMount;
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-    MntInfo.dmode        = MntOpts.dmode = 0770;
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-    MntInfo.fmode        = MntOpts.fmode = 0770;
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-    MntInfo.dmask        = MntOpts.dmask = 0000;
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-    MntInfo.fmask        = MntOpts.fmask = 0000;
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-    memcpy(MntInfo.szTag, g_szTag, sizeof(g_szTag)); AssertCompile(sizeof(MntInfo.szTag) >= sizeof(g_szTag));
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-    rc = RTStrCopy(MntInfo.name, sizeof(MntInfo.name), pEntry->pszName);
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-    if (RT_FAILURE(rc))
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+    unsigned long fFlags = MS_NODEV;
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+    char szOpts[MAX_MNTOPT_STR] = { '\0', };
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+    ssize_t cchOpts = RTStrPrintf2(szOpts, sizeof(szOpts),
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+                                   "uid=0,gid=%d,dmode=0770,fmode=0770,dmask=0000,fmask=0000", gidMount);
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+    if (cchOpts <= 0)
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     {
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-        VGSvcError("vbsvcAutomounterMountIt: Share name '%s' is too long for the MntInfo.name field!\n", pEntry->pszName);
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-        return rc;
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+        VGSvcError("vbsvcAutomounterMountIt: szOpts overflow! %zd\n", cchOpts);
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+        return VERR_BUFFER_OVERFLOW;
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     }
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-    errno = 0;
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-    unsigned long fFlags = MS_NODEV;
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-    rc = mount(pEntry->pszName, pEntry->pszActualMountPoint, "vboxsf", fFlags, &MntInfo);
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+    rc = mount(pEntry->pszName, pEntry->pszActualMountPoint, "vboxsf", fFlags, szOpts);
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     if (rc == 0)
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     {
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         VGSvcVerbose(0, "vbsvcAutomounterMountIt: Successfully mounted '%s' on '%s'\n",
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                      pEntry->pszName, pEntry->pszActualMountPoint);
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-
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-        errno = 0;
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-        rc = vbsfmount_complete(pEntry->pszName, pEntry->pszActualMountPoint, fFlags, &MntOpts);
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-        if (rc != 0) /* Ignorable. /etc/mtab is probably a link to /proc/mounts. */
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-            VGSvcVerbose(1, "vbsvcAutomounterMountIt: vbsfmount_complete failed: %s (%d/%d)\n",
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-                         rc == 1 ? "open_memstream" : rc == 2 ? "setmntent" : rc == 3 ? "addmntent" : "unknown", rc, errno);
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         return VINF_SUCCESS;
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     }
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     else if (errno == EINVAL)