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mingw: refuse paths containing reserved names
There are a couple of reserved names that cannot be file names on Windows, such as `AUX`, `NUL`, etc. For an almost complete list, see https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file If one would try to create a directory named `NUL`, it would actually "succeed", i.e. the call would return success, but nothing would be created. Worse, even adding a file extension to the reserved name does not make it a valid file name. To understand the rationale behind that behavior, see https://devblogs.microsoft.com/oldnewthing/20031022-00/?p=42073 Let's just disallow them all. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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parent
98d9b23e90
commit
4dc42c6c18
3 changed files with 110 additions and 18 deletions
102
compat/mingw.c
102
compat/mingw.c
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@ -393,7 +393,7 @@ int mingw_mkdir(const char *path, int mode)
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int ret;
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wchar_t wpath[MAX_PATH];
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if (!is_valid_win32_path(path)) {
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if (!is_valid_win32_path(path, 0)) {
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errno = EINVAL;
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return -1;
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}
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@ -479,7 +479,7 @@ int mingw_open (const char *filename, int oflags, ...)
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mode = va_arg(args, int);
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va_end(args);
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if (!is_valid_win32_path(filename)) {
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if (!is_valid_win32_path(filename, !create)) {
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errno = create ? EINVAL : ENOENT;
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return -1;
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}
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@ -550,14 +550,13 @@ FILE *mingw_fopen (const char *filename, const char *otype)
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int hide = needs_hiding(filename);
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FILE *file;
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wchar_t wfilename[MAX_PATH], wotype[4];
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if (!is_valid_win32_path(filename)) {
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if (filename && !strcmp(filename, "/dev/null"))
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wcscpy(wfilename, L"nul");
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else if (!is_valid_win32_path(filename, 1)) {
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int create = otype && strchr(otype, 'w');
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errno = create ? EINVAL : ENOENT;
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return NULL;
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}
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if (filename && !strcmp(filename, "/dev/null"))
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wcscpy(wfilename, L"nul");
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else if (xutftowcs_path(wfilename, filename) < 0)
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} else if (xutftowcs_path(wfilename, filename) < 0)
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return NULL;
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if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
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@ -580,14 +579,13 @@ FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
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int hide = needs_hiding(filename);
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FILE *file;
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wchar_t wfilename[MAX_PATH], wotype[4];
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if (!is_valid_win32_path(filename)) {
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if (filename && !strcmp(filename, "/dev/null"))
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wcscpy(wfilename, L"nul");
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else if (!is_valid_win32_path(filename, 1)) {
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int create = otype && strchr(otype, 'w');
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errno = create ? EINVAL : ENOENT;
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return NULL;
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}
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if (filename && !strcmp(filename, "/dev/null"))
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wcscpy(wfilename, L"nul");
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else if (xutftowcs_path(wfilename, filename) < 0)
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} else if (xutftowcs_path(wfilename, filename) < 0)
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return NULL;
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if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
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@ -2412,14 +2410,16 @@ static void setup_windows_environment(void)
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}
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}
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int is_valid_win32_path(const char *path)
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int is_valid_win32_path(const char *path, int allow_literal_nul)
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{
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const char *p = path;
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int preceding_space_or_period = 0, i = 0, periods = 0;
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if (!protect_ntfs)
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return 1;
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skip_dos_drive_prefix((char **)&path);
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goto segment_start;
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for (;;) {
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char c = *(path++);
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@ -2434,7 +2434,83 @@ int is_valid_win32_path(const char *path)
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return 1;
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i = periods = preceding_space_or_period = 0;
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segment_start:
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switch (*path) {
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case 'a': case 'A': /* AUX */
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if (((c = path[++i]) != 'u' && c != 'U') ||
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((c = path[++i]) != 'x' && c != 'X')) {
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not_a_reserved_name:
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path += i;
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continue;
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}
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break;
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case 'c': case 'C': /* COM<N>, CON, CONIN$, CONOUT$ */
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if ((c = path[++i]) != 'o' && c != 'O')
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goto not_a_reserved_name;
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c = path[++i];
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if (c == 'm' || c == 'M') { /* COM<N> */
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if (!isdigit(path[++i]))
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goto not_a_reserved_name;
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} else if (c == 'n' || c == 'N') { /* CON */
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c = path[i + 1];
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if ((c == 'i' || c == 'I') &&
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((c = path[i + 2]) == 'n' ||
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c == 'N') &&
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path[i + 3] == '$')
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i += 3; /* CONIN$ */
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else if ((c == 'o' || c == 'O') &&
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((c = path[i + 2]) == 'u' ||
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c == 'U') &&
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((c = path[i + 3]) == 't' ||
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c == 'T') &&
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path[i + 4] == '$')
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i += 4; /* CONOUT$ */
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} else
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goto not_a_reserved_name;
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break;
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case 'l': case 'L': /* LPT<N> */
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if (((c = path[++i]) != 'p' && c != 'P') ||
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((c = path[++i]) != 't' && c != 'T') ||
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!isdigit(path[++i]))
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goto not_a_reserved_name;
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break;
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case 'n': case 'N': /* NUL */
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if (((c = path[++i]) != 'u' && c != 'U') ||
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((c = path[++i]) != 'l' && c != 'L') ||
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(allow_literal_nul &&
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!path[i + 1] && p == path))
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goto not_a_reserved_name;
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break;
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case 'p': case 'P': /* PRN */
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if (((c = path[++i]) != 'r' && c != 'R') ||
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((c = path[++i]) != 'n' && c != 'N'))
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goto not_a_reserved_name;
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break;
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default:
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continue;
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}
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/*
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* So far, this looks like a reserved name. Let's see
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* whether it actually is one: trailing spaces, a file
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* extension, or an NTFS Alternate Data Stream do not
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* matter, the name is still reserved if any of those
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* follow immediately after the actual name.
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*/
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i++;
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if (path[i] == ' ') {
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preceding_space_or_period = 1;
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while (path[++i] == ' ')
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; /* skip all spaces */
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}
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c = path[i];
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if (c && c != '.' && c != ':' && c != '/' && c != '\\')
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goto not_a_reserved_name;
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/* contains reserved name */
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return 0;
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case '.':
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periods++;
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/* fallthru */
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@ -461,10 +461,17 @@ char *mingw_query_user_email(void);
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*
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* - contain any of the reserved characters, e.g. `:`, `;`, `*`, etc
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*
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* - correspond to reserved names (such as `AUX`, `PRN`, etc)
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*
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* The `allow_literal_nul` parameter controls whether the path `NUL` should
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* be considered valid (this makes sense e.g. before opening files, as it is
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* perfectly legitimate to open `NUL` on Windows, just as it is to open
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* `/dev/null` on Unix/Linux).
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*
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* Returns 1 upon success, otherwise 0.
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*/
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int is_valid_win32_path(const char *path);
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#define is_valid_path(path) is_valid_win32_path(path)
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int is_valid_win32_path(const char *path, int allow_literal_nul);
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#define is_valid_path(path) is_valid_win32_path(path, 0)
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/**
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* Converts UTF-8 encoded string to UTF-16LE.
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@ -470,6 +470,9 @@ test_expect_success MINGW 'is_valid_path() on Windows' '
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"win32 x" \
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../hello.txt \
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C:\\git \
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comm \
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conout.c \
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lptN \
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\
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--not \
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"win32 " \
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@ -477,7 +480,13 @@ test_expect_success MINGW 'is_valid_path() on Windows' '
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"win32." \
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"win32 . ." \
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.../hello.txt \
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colon:test
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colon:test \
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"AUX.c" \
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"abc/conOut\$ .xyz/test" \
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lpt8 \
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"lpt*" \
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Nul \
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"PRN./abc"
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'
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test_done
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