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grub/grub-core/osdep/windows/hostdisk.c
Colin Watson 62daa27056 util: Detect more I/O errors 
Many of GRUB's utilities don't check anywhere near all the possible
write errors.  For example, if grub-install runs out of space when
copying a file, it won't notice.  There were missing checks for the
return values of write, fflush, fsync, and close (or the equivalents on
other OSes), all of which must be checked.

I tried to be consistent with the existing logging practices of the
various hostdisk implementations, but they weren't entirely consistent
to start with so I used my judgement.  The result at least looks
reasonable on GNU/Linux when I provoke a write error:

  Installing for x86_64-efi platform.
  grub-install: error: cannot copy `/usr/lib/grub/x86_64-efi-signed/grubx64.efi.signed' to `/boot/efi/EFI/debian/grubx64.efi': No space left on device.

There are more missing checks in other utilities, but this should fix
the most critical ones.

Fixes Debian bug #922741.

Signed-off-by: Colin Watson <cjwatson@ubuntu.com>
Reviewed-by: Steve McIntyre <93sam@debian.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2019-03-05 10:23:47 +01:00

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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2004,2006,2007,2008,2009,2010,2011,2012,2013 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config-util.h>
#include <grub/disk.h>
#include <grub/partition.h>
#include <grub/msdos_partition.h>
#include <grub/types.h>
#include <grub/err.h>
#include <grub/emu/misc.h>
#include <grub/emu/hostdisk.h>
#include <grub/emu/getroot.h>
#include <grub/misc.h>
#include <grub/i18n.h>
#include <grub/list.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include <grub/util/windows.h>
#include <grub/charset.h>
#include <windows.h>
#include <winioctl.h>
#include <wincrypt.h>
#ifdef __CYGWIN__
#include <sys/cygwin.h>
#endif
#if SIZEOF_TCHAR == 1
LPTSTR
grub_util_utf8_to_tchar (const char *in)
{
return xstrdup (in);
}
char *
grub_util_tchar_to_utf8 (LPCTSTR in)
{
return xstrdup (in);
}
#elif SIZEOF_TCHAR == 2
LPTSTR
grub_util_utf8_to_tchar (const char *in)
{
LPTSTR ret;
size_t ssz = strlen (in);
size_t tsz = 2 * (GRUB_MAX_UTF16_PER_UTF8 * ssz + 1);
ret = xmalloc (tsz);
tsz = grub_utf8_to_utf16 (ret, tsz,
(const grub_uint8_t *) in, ssz, NULL);
ret[tsz] = 0;
return ret;
}
char *
grub_util_tchar_to_utf8 (LPCTSTR in)
{
size_t ssz;
for (ssz = 0; in[ssz]; ssz++);
size_t tsz = GRUB_MAX_UTF8_PER_UTF16 * ssz + 1;
grub_uint8_t *ret = xmalloc (tsz);
*grub_utf16_to_utf8 (ret, in, ssz) = '\0';
return (char *) ret;
}
#else
#error "Unsupported TCHAR size"
#endif
static LPTSTR
grub_util_get_windows_path_real (const char *path)
{
LPTSTR fpa;
LPTSTR tpath;
size_t alloc, len;
tpath = grub_util_utf8_to_tchar (path);
alloc = PATH_MAX;
while (1)
{
fpa = xmalloc (alloc * sizeof (fpa[0]));
len = GetFullPathName (tpath, alloc, fpa, NULL);
if (len >= alloc)
{
free (fpa);
alloc = 2 * (len + 2);
continue;
}
if (len == 0)
{
free (fpa);
return tpath;
}
free (tpath);
return fpa;
}
}
#ifdef __CYGWIN__
LPTSTR
grub_util_get_windows_path (const char *path)
{
LPTSTR winpath;
/* Workaround cygwin bugs with //?/. */
if ((path[0] == '\\' || path[0] == '/')
&& (path[1] == '\\' || path[1] == '/')
&& (path[2] == '?' || path[2] == '.')
&& (path[3] == '\\' || path[3] == '/'))
return grub_util_get_windows_path_real (path);
winpath = xmalloc (sizeof (winpath[0]) * PATH_MAX);
memset (winpath, 0, sizeof (winpath[0]) * PATH_MAX);
if (cygwin_conv_path ((sizeof (winpath[0]) == 1 ? CCP_POSIX_TO_WIN_A
: CCP_POSIX_TO_WIN_W) | CCP_ABSOLUTE, path, winpath,
sizeof (winpath[0]) * PATH_MAX))
grub_util_error ("%s", _("cygwin_conv_path() failed"));
return winpath;
}
#else
LPTSTR
grub_util_get_windows_path (const char *path)
{
return grub_util_get_windows_path_real (path);
}
#endif
grub_uint64_t
grub_util_get_fd_size (grub_util_fd_t hd, const char *name_in,
unsigned *log_secsize)
{
grub_int64_t size = -1LL;
int log_sector_size = 9;
LPTSTR name = grub_util_get_windows_path (name_in);
if (log_secsize)
*log_secsize = log_sector_size;
if (((name[0] == '/') || (name[0] == '\\')) &&
((name[1] == '/') || (name[1] == '\\')) &&
((name[2] == '.') || (name[2] == '?')) &&
((name[3] == '/') || (name[3] == '\\')))
{
DWORD nr;
DISK_GEOMETRY g;
if (! DeviceIoControl (hd, IOCTL_DISK_GET_DRIVE_GEOMETRY,
0, 0, &g, sizeof (g), &nr, 0))
goto fail;
size = g.Cylinders.QuadPart;
size *= g.TracksPerCylinder * g.SectorsPerTrack * g.BytesPerSector;
for (log_sector_size = 0;
(1 << log_sector_size) < g.BytesPerSector;
log_sector_size++);
}
else
{
ULARGE_INTEGER s;
s.LowPart = GetFileSize (hd, &s.HighPart);
size = s.QuadPart;
}
fail:
if (log_secsize)
*log_secsize = log_sector_size;
free (name);
return size;
}
void
grub_hostdisk_flush_initial_buffer (const char *os_dev __attribute__ ((unused)))
{
}
int
grub_util_fd_seek (grub_util_fd_t fd, grub_uint64_t off)
{
LARGE_INTEGER offset;
offset.QuadPart = off;
if (!SetFilePointerEx (fd, offset, NULL, FILE_BEGIN))
return -1;
return 0;
}
grub_util_fd_t
grub_util_fd_open (const char *os_dev, int flags)
{
DWORD flg = 0, crt;
LPTSTR dev = grub_util_get_windows_path (os_dev);
grub_util_fd_t ret;
if (flags & GRUB_UTIL_FD_O_WRONLY)
flg |= GENERIC_WRITE;
if (flags & GRUB_UTIL_FD_O_RDONLY)
flg |= GENERIC_READ;
if (flags & GRUB_UTIL_FD_O_CREATTRUNC)
crt = CREATE_ALWAYS;
else
crt = OPEN_EXISTING;
ret = CreateFile (dev, flg, FILE_SHARE_READ | FILE_SHARE_WRITE,
0, crt, 0, 0);
free (dev);
return ret;
}
ssize_t
grub_util_fd_read (grub_util_fd_t fd, char *buf, size_t len)
{
DWORD real_read;
if (!ReadFile(fd, buf, len, &real_read, NULL))
{
grub_util_info ("read err %x", (int) GetLastError ());
return -1;
}
grub_util_info ("successful read");
return real_read;
}
ssize_t
grub_util_fd_write (grub_util_fd_t fd, const char *buf, size_t len)
{
DWORD real_read;
if (!WriteFile(fd, buf, len, &real_read, NULL))
{
grub_util_info ("write err %x", (int) GetLastError ());
return -1;
}
grub_util_info ("successful write");
return real_read;
}
static int allow_fd_syncs = 1;
int
grub_util_fd_sync (grub_util_fd_t fd)
{
if (allow_fd_syncs)
{
if (!FlushFileBuffers (fd))
{
grub_util_info ("flush err %x", (int) GetLastError ());
return -1;
}
}
return 0;
}
void
grub_util_disable_fd_syncs (void)
{
allow_fd_syncs = 0;
}
int
grub_util_fd_close (grub_util_fd_t fd)
{
if (!CloseHandle (fd))
{
grub_util_info ("close err %x", (int) GetLastError ());
return -1;
}
return 0;
}
const char *
grub_util_fd_strerror (void)
{
DWORD err = GetLastError ();
LPTSTR tstr = NULL;
static char *last;
char *ret, *ptr;
free (last);
last = 0;
FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, err, 0, (void *) &tstr,
0, NULL);
if (!tstr)
return "unknown error";
ret = grub_util_tchar_to_utf8 (tstr);
LocalFree (tstr);
last = ret;
for (ptr = ret + strlen (ret) - 1;
ptr >= ret && (*ptr == '\n' || *ptr == '\r');
ptr--);
ptr[1] = '\0';
return ret;
}
char *
grub_canonicalize_file_name (const char *path)
{
char *ret;
LPTSTR windows_path;
ret = xmalloc (PATH_MAX);
windows_path = grub_util_get_windows_path (path);
if (!windows_path)
return NULL;
ret = grub_util_tchar_to_utf8 (windows_path);
free (windows_path);
return ret;
}
void
grub_util_mkdir (const char *dir)
{
LPTSTR windows_name;
windows_name = grub_util_get_windows_path (dir);
CreateDirectory (windows_name, NULL);
free (windows_name);
}
int
grub_util_rename (const char *from, const char *to)
{
LPTSTR windows_from, windows_to;
int ret;
windows_from = grub_util_get_windows_path (from);
windows_to = grub_util_get_windows_path (to);
ret = !MoveFile (windows_from, windows_to);
free (windows_from);
free (windows_to);
return ret;
}
struct grub_util_fd_dir
{
WIN32_FIND_DATA fd;
HANDLE hnd;
int is_end;
char *last;
};
grub_util_fd_dir_t
grub_util_fd_opendir (const char *name)
{
struct grub_util_fd_dir *ret;
LPTSTR name_windows;
LPTSTR pattern;
ssize_t l;
name_windows = grub_util_get_windows_path (name);
for (l = 0; name_windows[l]; l++);
for (l--; l >= 0 && (name_windows[l] == '\\' || name_windows[l] == '/'); l--);
l++;
pattern = xmalloc ((l + 3) * sizeof (pattern[0]));
memcpy (pattern, name_windows, l * sizeof (pattern[0]));
pattern[l] = '\\';
pattern[l + 1] = '*';
pattern[l + 2] = '\0';
ret = xmalloc (sizeof (*ret));
memset (ret, 0, sizeof (*ret));
ret->hnd = FindFirstFile (pattern, &ret->fd);
free (name_windows);
free (pattern);
if (ret->hnd == INVALID_HANDLE_VALUE)
{
DWORD err = GetLastError ();
if (err == ERROR_FILE_NOT_FOUND)
{
ret->is_end = 1;
return ret;
}
return NULL;
}
return ret;
}
void
grub_util_fd_closedir (grub_util_fd_dir_t dirp)
{
if (dirp->hnd != INVALID_HANDLE_VALUE)
CloseHandle (dirp->hnd);
free (dirp->last);
free (dirp);
}
grub_util_fd_dirent_t
grub_util_fd_readdir (grub_util_fd_dir_t dirp)
{
char *ret;
free (dirp->last);
dirp->last = NULL;
if (dirp->is_end)
return NULL;
ret = grub_util_tchar_to_utf8 (dirp->fd.cFileName);
dirp->last = ret;
if (!FindNextFile (dirp->hnd, &dirp->fd))
dirp->is_end = 1;
return (grub_util_fd_dirent_t) ret;
}
int
grub_util_unlink (const char *name)
{
LPTSTR name_windows;
int ret;
name_windows = grub_util_get_windows_path (name);
ret = !DeleteFile (name_windows);
free (name_windows);
return ret;
}
int
grub_util_rmdir (const char *name)
{
LPTSTR name_windows;
int ret;
name_windows = grub_util_get_windows_path (name);
ret = !RemoveDirectory (name_windows);
free (name_windows);
return ret;
}
#ifndef __CYGWIN__
static char *
get_temp_name (void)
{
TCHAR rt[1024];
TCHAR *ptr;
HCRYPTPROV hCryptProv;
grub_uint8_t rnd[5];
int i;
GetTempPath (ARRAY_SIZE (rt) - 100, rt);
if (!CryptAcquireContext (&hCryptProv,
NULL,
MS_DEF_PROV,
PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT)
|| !CryptGenRandom (hCryptProv, 5, rnd))
grub_util_error ("%s", _("couldn't retrieve random data"));
CryptReleaseContext (hCryptProv, 0);
for (ptr = rt; *ptr; ptr++);
memcpy (ptr, TEXT("\\GRUB."), sizeof (TEXT("\\GRUB.")));
ptr += sizeof ("\\GRUB.") - 1;
for (i = 0; i < 8; i++)
{
grub_size_t b = i * 5;
grub_uint8_t r;
grub_size_t f1 = GRUB_CHAR_BIT - b % GRUB_CHAR_BIT;
grub_size_t f2;
if (f1 > 5)
f1 = 5;
f2 = 5 - f1;
r = (rnd[b / GRUB_CHAR_BIT] >> (b % GRUB_CHAR_BIT)) & ((1 << f1) - 1);
if (f2)
r |= (rnd[b / GRUB_CHAR_BIT + 1] & ((1 << f2) - 1)) << f1;
if (r < 10)
*ptr++ = '0' + r;
else
*ptr++ = 'a' + (r - 10);
}
*ptr = '\0';
return grub_util_tchar_to_utf8 (rt);
}
char *
grub_util_make_temporary_file (void)
{
char *ret = get_temp_name ();
FILE *f;
f = grub_util_fopen (ret, "wb");
if (f)
fclose (f);
return ret;
}
char *
grub_util_make_temporary_dir (void)
{
char *ret = get_temp_name ();
grub_util_mkdir (ret);
return ret;
}
#endif
int
grub_util_is_directory (const char *name)
{
LPTSTR name_windows;
DWORD attr;
name_windows = grub_util_get_windows_path (name);
if (!name_windows)
return 0;
attr = GetFileAttributes (name_windows);
grub_free (name_windows);
return !!(attr & FILE_ATTRIBUTE_DIRECTORY);
}
int
grub_util_is_regular (const char *name)
{
LPTSTR name_windows;
DWORD attr;
name_windows = grub_util_get_windows_path (name);
if (!name_windows)
return 0;
attr = GetFileAttributes (name_windows);
grub_free (name_windows);
return !(attr & FILE_ATTRIBUTE_DIRECTORY)
&& !(attr & FILE_ATTRIBUTE_REPARSE_POINT) && attr;
}
grub_uint32_t
grub_util_get_mtime (const char *path)
{
LPTSTR name_windows;
BOOL b;
WIN32_FILE_ATTRIBUTE_DATA attr;
ULARGE_INTEGER us_ul;
name_windows = grub_util_get_windows_path (path);
if (!name_windows)
return 0;
b = GetFileAttributesEx (name_windows, GetFileExInfoStandard, &attr);
grub_free (name_windows);
if (!b)
return 0;
us_ul.LowPart = attr.ftLastWriteTime.dwLowDateTime;
us_ul.HighPart = attr.ftLastWriteTime.dwHighDateTime;
return (us_ul.QuadPart / 10000000)
- 86400ULL * 365 * (1970 - 1601)
- 86400ULL * ((1970 - 1601) / 4) + 86400ULL * ((1970 - 1601) / 100);
}
#ifdef __MINGW32__
FILE *
grub_util_fopen (const char *path, const char *mode)
{
LPTSTR tpath;
FILE *ret;
tpath = grub_util_get_windows_path (path);
#if SIZEOF_TCHAR == 1
ret = fopen (tpath, tmode);
#else
LPTSTR tmode;
tmode = grub_util_utf8_to_tchar (mode);
ret = _wfopen (tpath, tmode);
free (tmode);
#endif
free (tpath);
return ret;
}
int
grub_util_file_sync (FILE *f)
{
HANDLE hnd;
if (fflush (f) != 0)
{
grub_util_info ("fflush err %x", (int) GetLastError ());
return -1;
}
if (!allow_fd_syncs)
return 0;
hnd = (HANDLE) _get_osfhandle (fileno (f));
if (!FlushFileBuffers (hnd))
{
grub_util_info ("flush err %x", (int) GetLastError ());
return -1;
}
return 0;
}
int
grub_util_is_special_file (const char *name)
{
LPTSTR name_windows;
DWORD attr;
name_windows = grub_util_get_windows_path (name);
if (!name_windows)
return 1;
attr = GetFileAttributes (name_windows);
grub_free (name_windows);
return !!(attr & FILE_ATTRIBUTE_REPARSE_POINT) || !attr;
}
#else
void
grub_util_file_sync (FILE *f)
{
fflush (f);
if (!allow_fd_syncs)
return;
fsync (fileno (f));
}
FILE *
grub_util_fopen (const char *path, const char *mode)
{
return fopen (path, mode);
}
#endif
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