[reactos] 01/01: [USETUP] When opening the target file for dropping readonly mode only use required access. This avoids the open failing on certain file systems where GENERIC_WRITE access would be denied for a readonly file. This is an addendum to 82f44a2.

[Pierre Schweitzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=cc8ccc6eb88702bfa4716…

commit cc8ccc6eb88702bfa471617a1cbb5c9adb349115
Author: Pierre Schweitzer <pierre(a)reactos.org>
AuthorDate: Sat Jan 6 12:11:02 2018 +0100

    [USETUP] When opening the target file for dropping readonly mode only use required
access.
    This avoids the open failing on certain file systems where GENERIC_WRITE access would
be denied
    for a readonly file.
    This is an addendum to 82f44a2.
    
    CORE-14158
---
 base/setup/usetup/filesup.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/base/setup/usetup/filesup.c b/base/setup/usetup/filesup.c
index 65a372a337..4238557bbe 100644
--- a/base/setup/usetup/filesup.c
+++ b/base/setup/usetup/filesup.c
@@ -355,9 +355,9 @@ SetupCopyFile(
         {
             FILE_BASIC_INFORMATION FileBasicInfo;
 
-            /* Reattempt to open it */
+            /* Reattempt to open it with limited access */
             Status = NtCreateFile(&FileHandleDest,
-                                  GENERIC_WRITE | SYNCHRONIZE,
+                                  FILE_WRITE_ATTRIBUTES | SYNCHRONIZE,
                                   &ObjectAttributes,
                                   &IoStatusBlock,
                                   NULL,
@@ -369,10 +369,7 @@ SetupCopyFile(
                                   FILE_SYNCHRONOUS_IO_NONALERT,
                                   NULL,
                                   0);
-            /* Fail for real if we cannot open it that way
-             * XXX: actually, we should try to refine access rights
-             * to only have write_attributes, should be enough
-             */
+            /* Fail for real if we cannot open it that way */
             if (!NT_SUCCESS(Status))
             {
                 DPRINT1("NtCreateFile failed: %x, %wZ\n", Status,
&FileName);