[reactos] 01/01: [FASTFAT] On file overwrite, deny it if file as HIDDEN/SYSTEM flag and caller doesn't set them.

[Pierre Schweitzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=f3fecf92c1033a747b0482...

commit f3fecf92c1033a747b04828de974444c1013dc8f
Author: Pierre Schweitzer [e-mail]
AuthorDate: Mon Jan 1 12:12:08 2018 +0100

[FASTFAT] On file overwrite, deny it if file as HIDDEN/SYSTEM flag and caller doesn't set them.

CORE-14158
---
 drivers/filesystems/fastfat/create.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/filesystems/fastfat/create.c b/drivers/filesystems/fastfat/create.c
index 20a4bc0d04..89ac5e07c4 100644
--- a/drivers/filesystems/fastfat/create.c
+++ b/drivers/filesystems/fastfat/create.c
@@ -728,6 +728,8 @@ VfatCreateFile(
         return Status;
     }

+    Attributes = Stack->Parameters.Create.FileAttributes & ~FILE_ATTRIBUTE_NORMAL;
+
     /* If the file open failed then create the required file */
     if (!NT_SUCCESS (Status))
     {
@@ -736,7 +738,6 @@ VfatCreateFile(
             RequestedDisposition == FILE_OVERWRITE_IF ||
             RequestedDisposition == FILE_SUPERSEDE)
         {
-            Attributes = Stack->Parameters.Create.FileAttributes & ~FILE_ATTRIBUTE_NORMAL;
             if (!BooleanFlagOn(RequestedOptions, FILE_DIRECTORY_FILE))
             {
                 if (TrailingBackslash)
@@ -908,9 +909,17 @@ VfatCreateFile(
             RequestedDisposition == FILE_OVERWRITE_IF ||
             RequestedDisposition == FILE_SUPERSEDE)
         {
+            if ((BooleanFlagOn(*pFcb->Attributes, FILE_ATTRIBUTE_HIDDEN) && !BooleanFlagOn(Attributes, FILE_ATTRIBUTE_HIDDEN)) ||
+                (BooleanFlagOn(*pFcb->Attributes, FILE_ATTRIBUTE_SYSTEM) && !BooleanFlagOn(Attributes, FILE_ATTRIBUTE_SYSTEM)))
+            {
+                VfatCloseFile(DeviceExt, FileObject);
+                vfatAddToStat(DeviceExt, Fat.FailedCreates, 1);
+                return STATUS_ACCESS_DENIED;
+            }
+
             if (!vfatFCBIsDirectory(pFcb))
             {
-                *pFcb->Attributes = Stack->Parameters.Create.FileAttributes & ~FILE_ATTRIBUTE_NORMAL;
+                *pFcb->Attributes = Attributes & ~FILE_ATTRIBUTE_NORMAL;
                 *pFcb->Attributes |= FILE_ATTRIBUTE_ARCHIVE;
                 VfatUpdateEntry(pFcb, vfatVolumeIsFatX(DeviceExt));
             }