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* fhandler.cc (rootdir): Drop useless post-increment. Take volume

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mount points into account.
	(check_posix_perm): Allocate space for root directory big enough.
This commit is contained in:
Corinna Vinschen
2006-12-10 12:56:50 +00:00
parent 8af19fdb25
commit 30cf835f7e
2 changed files with 62 additions and 2 deletions
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6
winsup/cygwin/ChangeLog
View File

@@ -1,3 +1,9 @@
2006-12-10 Corinna Vinschen <corinna@vinschen.de>
* fhandler.cc (rootdir): Drop useless post-increment. Take volume
mount points into account.
(check_posix_perm): Allocate space for root directory big enough.
2006-12-09 Corinna Vinschen <corinna@vinschen.de>
* syscalls.cc (try_to_bin): Add comment that this is not possibly

58
winsup/cygwin/fhandler.cc
View File

@@ -1221,7 +1221,7 @@ rootdir (const char *full_path, char *root_path)
if (full_path[1] == ':')
{
*rootp++ = *full_path++;
*rootp++ = *full_path;
*rootp++ = ':';
}
else if (full_path[0] == '\\' && full_path[1] == '\\')
@@ -1239,6 +1239,60 @@ rootdir (const char *full_path, char *root_path)
*rootp++ = '\\';
*rootp = '\0';
/* This also determines whether reparse points are available. */
if (!wincap.has_guid_volumes ())
return root_path;
PREPARSE_DATA_BUFFER rp = (PREPARSE_DATA_BUFFER)
alloca (MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
char *test_path = (char *) alloca (CYG_MAX_PATH);
strcpy (test_path, full_path);
/* This determines the minimum length of the path we test for mount points.
If we're below this value, it's the root dir of the path itself. */
char *min_c = test_path + (rootp - root_path);
char *c = min_c;
while (*c)
++c;
while (c > min_c)
{
*c = '\0';
# define MOUNTPT_ATTR (FILE_ATTRIBUTE_DIRECTORY \
| FILE_ATTRIBUTE_REPARSE_POINT)
DWORD attr = GetFileAttributes (test_path);
if (attr != INVALID_FILE_ATTRIBUTES
&& (attr & MOUNTPT_ATTR) == MOUNTPT_ATTR)
{
HANDLE h = CreateFile (test_path, GENERIC_READ, FILE_SHARE_READ,
&sec_none_nih, OPEN_EXISTING,
FILE_FLAG_OPEN_REPARSE_POINT
| FILE_FLAG_BACKUP_SEMANTICS, NULL);
if (h != INVALID_HANDLE_VALUE)
{
DWORD size;
BOOL ret = DeviceIoControl (h, FSCTL_GET_REPARSE_POINT, NULL,
0, (LPVOID) rp,
MAXIMUM_REPARSE_DATA_BUFFER_SIZE,
&size, NULL);
CloseHandle (h);
if (ret
&& rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT
&& !rp->SymbolicLinkReparseBuffer.PrintNameLength)
{
memcpy (root_path, test_path, len = c - test_path);
strcpy (root_path + len, "\\");
CloseHandle (h);
break;
}
}
}
while (--c > min_c && *c != '\\')
;
}
return root_path;
}
@@ -1739,7 +1793,7 @@ check_posix_perm (const char *fname, int v)
if (!allow_ntsec)
return 0;
char *root = rootdir (fname, (char *)alloca (strlen (fname)));
char *root = rootdir (fname, (char *)alloca (strlen (fname) + 2));
if (!allow_smbntsec
&& ((root[0] == '\\' && root[1] == '\\')