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* ntdll.h (STATUS_END_OF_FILE): Define.

Browse Source 
* path.cc (symlink_info::check_shortcut): Use NT function to get file
	size.  Reintroduce checking file size before reading it.  Eliminiate
	close_it label.
	(symlink_info::check_sysfile): Check for EOF condition.
This commit is contained in:
Corinna Vinschen 2007-10-13 11:06:43 +00:00
parent 8cca1e6c93
commit fc7290fd39
3 changed files with 42 additions and 19 deletions
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8
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,11 @@
2007-10-12 Corinna Vinschen <corinna@vinschen.de>
* ntdll.h (STATUS_END_OF_FILE): Define.
* path.cc (symlink_info::check_shortcut): Use NT function to get file
size. Reintroduce checking file size before reading it. Eliminiate
close_it label.
(symlink_info::check_sysfile): Check for EOF condition.
2007-10-11 Corinna Vinschen <corinna@vinschen.de>
* path.cc (basename): Return pointer into the path argument itself.

1
winsup/cygwin/ntdll.h
View File

@ -17,6 +17,7 @@
#define STATUS_INVALID_PARAMETER ((NTSTATUS) 0xc000000d)
#define STATUS_NO_SUCH_FILE ((NTSTATUS) 0xc000000f)
#define STATUS_INVALID_DEVICE_REQUEST ((NTSTATUS) 0xc0000010)
#define STATUS_END_OF_FILE ((NTSTATUS) 0xc0000011)
#define STATUS_NO_MEDIA_IN_DEVICE ((NTSTATUS) 0xc0000013)
#define STATUS_ACCESS_DENIED ((NTSTATUS) 0xc0000022)
#define STATUS_BUFFER_TOO_SMALL ((NTSTATUS) 0xc0000023)

52
winsup/cygwin/path.cc
View File

@ -3158,19 +3158,30 @@ symlink_info::check_shortcut (HANDLE h)
char *buf, *cp;
unsigned short len;
int res = 0;
DWORD size;
NTSTATUS status;
IO_STATUS_BLOCK io;
FILE_STANDARD_INFORMATION fsi;
size = GetFileSize (h, NULL);
buf = (char *) alloca (size + 1);
if (!NT_SUCCESS (NtReadFile (h, NULL, NULL, NULL,
&io, buf, size, NULL, NULL)))
status = NtQueryInformationFile (h, &io, &fsi, sizeof fsi,
FileStandardInformation);
if (!NT_SUCCESS (status))
{
set_error (EIO);
goto close_it;
return 0;
}
if (fsi.EndOfFile.QuadPart <= sizeof (win_shortcut_hdr)
|| fsi.EndOfFile.QuadPart > 4 * 65536)
return 0;
buf = (char *) alloca (fsi.EndOfFile.LowPart + 1);
if (!NT_SUCCESS (NtReadFile (h, NULL, NULL, NULL,
&io, buf, fsi.EndOfFile.LowPart, NULL, NULL)))
{
set_error (EIO);
return 0;
}
file_header = (win_shortcut_hdr *) buf;
if (io.Information != size || !cmp_shortcut_header (file_header))
if (io.Information != fsi.EndOfFile.LowPart
|| !cmp_shortcut_header (file_header))
goto file_not_symlink;
cp = buf + sizeof (win_shortcut_hdr);
if (file_header->flags & WSH_FLAG_IDLIST) /* Skip ITEMIDLIST */
@ -3185,7 +3196,7 @@ symlink_info::check_shortcut (HANDLE h)
{
/* Has appended full path? If so, use it instead of description. */
unsigned short relpath_len = *(unsigned short *) (cp + len);
if (cp + len + 2 + relpath_len < buf + size)
if (cp + len + 2 + relpath_len < buf + fsi.EndOfFile.LowPart)
{
cp += len + 2 + relpath_len;
len = *(unsigned short *) cp;
@ -3198,15 +3209,13 @@ symlink_info::check_shortcut (HANDLE h)
}
if (res) /* It's a symlink. */
pflags = PATH_SYMLINK | PATH_LNK;
goto close_it;
return res;
file_not_symlink:
/* Not a symlink, see if executable. */
if (!(pflags & PATH_ALL_EXEC) && has_exec_chars ((const char *) &file_header, io.Information))
pflags |= PATH_EXEC;
close_it:
return res;
return 0;
}
int
@ -3214,14 +3223,17 @@ symlink_info::check_sysfile (HANDLE h)
{
char cookie_buf[sizeof (SYMLINK_COOKIE) - 1];
char srcbuf[SYMLINK_MAX + 2];
NTSTATUS status;
IO_STATUS_BLOCK io;
int res = 0;
if (!NT_SUCCESS (NtReadFile (h, NULL, NULL, NULL, &io,
cookie_buf, sizeof (cookie_buf), NULL, NULL)))
status = NtReadFile (h, NULL, NULL, NULL, &io, cookie_buf,
sizeof (cookie_buf), NULL, NULL);
if (!NT_SUCCESS (status))
{
debug_printf ("ReadFile1 failed");
set_error (EIO);
if (status != STATUS_END_OF_FILE)
set_error (EIO);
}
else if (io.Information == sizeof (cookie_buf)
&& memcmp (cookie_buf, SYMLINK_COOKIE, sizeof (cookie_buf)) == 0)
@ -3229,16 +3241,18 @@ symlink_info::check_sysfile (HANDLE h)
/* It's a symlink. */
pflags = PATH_SYMLINK;
if (!NT_SUCCESS (NtReadFile (h, NULL, NULL, NULL, &io,
srcbuf, SYMLINK_MAX + 2, NULL, NULL)))
status = NtReadFile (h, NULL, NULL, NULL, &io, srcbuf,
SYMLINK_MAX + 2, NULL, NULL);
if (!NT_SUCCESS (status))
{
debug_printf ("ReadFile2 failed");
set_error (EIO);
if (status != STATUS_END_OF_FILE)
set_error (EIO);
}
else if (io.Information > SYMLINK_MAX + 1)
{
debug_printf ("symlink string too long");
set_error (EIO);
}
else
res = posixify (srcbuf);