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* syscalls.cc (rename): Drop handling paths > 32757 chars, emit EINVAL 

instead, thus simplifying code allocating and filling pfri.  Drop size
	and use constant expression in NtSetInformationFile call.  Add comments.
	Drop redundant test for fs_serial_number and change comment accordingly.
This commit is contained in:
Corinna Vinschen 2013-01-11 12:34:41 +00:00
parent 2880becf0c
commit 7142197465
2 changed files with 28 additions and 22 deletions
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7
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,10 @@
2013-01-11 Corinna Vinschen <corinna@vinschen.de>
* syscalls.cc (rename): Drop handling paths > 32757 chars, emit EINVAL
instead, thus simplifying code allocating and filling pfri. Drop size
and use constant expression in NtSetInformationFile call. Add comments.
Drop redundant test for fs_serial_number and change comment accordingly.
2013-01-11 Thomas Wolff <towo@towo.net>
* fhandler.h (class dev_console): Flag for expanded control sequence.

43
winsup/cygwin/syscalls.cc
View File

@ -1,7 +1,7 @@
/* syscalls.cc: syscalls
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Red Hat, Inc.
2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Red Hat, Inc.
This file is part of Cygwin.
@ -2035,7 +2035,6 @@ rename (const char *oldpath, const char *newpath)
HANDLE old_trans = NULL, trans = NULL;
OBJECT_ATTRIBUTES attr;
IO_STATUS_BLOCK io;
ULONG size;
FILE_STANDARD_INFORMATION ofsi;
PFILE_RENAME_INFORMATION pfri;
@ -2407,14 +2406,13 @@ retry:
/* SUSv3: If the old argument and the new argument resolve to the same
existing file, rename() shall return successfully and perform no
other action.
The test tries to be as quick as possible. First it tests for identical
volume serial numbers because that information is available anyway.
Then it tests if oldpath has more than 1 hardlink, then it opens newpath
The test tries to be as quick as possible. Due to the above cross device
check we already know both files are on the same device. So it just
tests if oldpath has more than 1 hardlink, then it opens newpath
and tests for identical file ids. If so, oldpath and newpath refer to
the same file. */
if ((removepc || dstpc->exists ())
&& !oldpc.isdir ()
&& dstpc->fs_serial_number () == oldpc.fs_serial_number ()
&& NT_SUCCESS (NtQueryInformationFile (fh, &io, &ofsi, sizeof ofsi,
FileStandardInformation))
&& ofsi.NumberOfLinks > 1
@ -2440,6 +2438,18 @@ retry:
}
NtClose (nfh);
}
/* Create FILE_RENAME_INFORMATION struct. Using a tmp_pathbuf area allows
for paths of up to 32757 chars. This test is just for paranoia's sake. */
if (dstpc->get_nt_native_path ()->Length > NT_MAX_PATH * sizeof (WCHAR)
- sizeof (FILE_RENAME_INFORMATION))
{
debug_printf ("target filename too long");
set_errno (EINVAL);
goto out;
}
pfri = (PFILE_RENAME_INFORMATION) tp.w_get ();
pfri->ReplaceIfExists = TRUE;
pfri->RootDirectory = NULL;
if (oldpc.fs_is_nfs ())
{
/* Workaround depressing NFS bug. FILE_RENAME_INFORMATION.FileName
@ -2477,30 +2487,18 @@ retry:
while ((oldp = wcschr (++oldp, L'\\')) != NULL)
newp = wcpcpy (newp, L"..\\");
newp = wcpcpy (newp, dstp);
size = sizeof (FILE_RENAME_INFORMATION)
+ (newp - newdst) * sizeof (WCHAR);
if (size > NT_MAX_PATH * sizeof (WCHAR)) /* Hopefully very seldom. */
pfri = (PFILE_RENAME_INFORMATION) alloca (size);
else
pfri = (PFILE_RENAME_INFORMATION) tp.w_get ();
pfri->FileNameLength = (newp - newdst) * sizeof (WCHAR);
memcpy (&pfri->FileName, newdst, pfri->FileNameLength);
}
else
{
size = sizeof (FILE_RENAME_INFORMATION)
+ dstpc->get_nt_native_path ()->Length;
if (size > NT_MAX_PATH * sizeof (WCHAR)) /* Hopefully very seldom. */
pfri = (PFILE_RENAME_INFORMATION) alloca (size);
else
pfri = (PFILE_RENAME_INFORMATION) tp.w_get ();
pfri->FileNameLength = dstpc->get_nt_native_path ()->Length;
memcpy (&pfri->FileName, dstpc->get_nt_native_path ()->Buffer,
pfri->FileNameLength);
}
pfri->ReplaceIfExists = TRUE;
pfri->RootDirectory = NULL;
status = NtSetInformationFile (fh, &io, pfri, size, FileRenameInformation);
status = NtSetInformationFile (fh, &io, pfri,
sizeof *pfri + pfri->FileNameLength,
FileRenameInformation);
/* This happens if the access rights don't allow deleting the destination.
Even if the handle to the original file is opened with BACKUP
and/or RECOVERY, these flags don't apply to the destination of the
@ -2537,7 +2535,8 @@ retry:
}
}
if (NT_SUCCESS (status = unlink_nt (*dstpc)))
status = NtSetInformationFile (fh, &io, pfri, size,
status = NtSetInformationFile (fh, &io, pfri,
sizeof *pfri + pfri->FileNameLength,
FileRenameInformation);
}
if (NT_SUCCESS (status))