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authorJunio C Hamano <gitster@pobox.com>2008-01-28 22:44:27 -0800
committerJunio C Hamano <gitster@pobox.com>2008-02-05 00:44:10 -0800
commitd089ebaad5315325d67db30176df1bbd7754fda9 (patch)
tree2c3c9e8d7a66de215e409d223ae69bc2c1e39a04 /setup.c
parent7a2078b4b00fb1c5d7b0bf8155778f79377b8f2f (diff)
downloadgit-d089ebaad5315325d67db30176df1bbd7754fda9.tar.gz
git-d089ebaad5315325d67db30176df1bbd7754fda9.tar.xz
setup: sanitize absolute and funny paths in get_pathspec()
The prefix_path() function called from get_pathspec() is responsible for translating list of user-supplied pathspecs to list of pathspecs that is relative to the root of the work tree. When working inside a subdirectory, the user-supplied pathspecs are taken to be relative to the current subdirectory. Among special path components in pathspecs, we used to accept and interpret only "." ("the directory", meaning a no-op) and ".." ("up one level") at the beginning. Everything else was passed through as-is. For example, if you are in Documentation/ directory of the project, you can name Documentation/howto/maintain-git.txt as: howto/maintain-git.txt ../Documentation/howto/maitain-git.txt ../././Documentation/howto/maitain-git.txt but not as: howto/./maintain-git.txt $(pwd)/howto/maintain-git.txt This patch updates prefix_path() in several ways: - If the pathspec is not absolute, prefix (i.e. the current subdirectory relative to the root of the work tree, with terminating slash, if not empty) and the pathspec is concatenated first and used in the next step. Otherwise, that absolute pathspec is used in the next step. - Then special path components "." (no-op) and ".." (up one level) are interpreted to simplify the path. It is an error to have too many ".." to cause the intermediate result to step outside of the input to this step. - If the original pathspec was not absolute, the result from the previous step is the resulting "sanitized" pathspec. Otherwise, the result from the previous step is still absolute, and it is an error if it does not begin with the directory that corresponds to the root of the work tree. The directory is stripped away from the result and is returned. - In any case, the resulting pathspec in the array get_pathspec() returns omit the ones that caused errors. With this patch, the last two examples also behave as expected. Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'setup.c')
-rw-r--r--setup.c158
1 files changed, 116 insertions, 42 deletions
diff --git a/setup.c b/setup.c
index adede16a4..23c9a11be 100644
--- a/setup.c
+++ b/setup.c
@@ -4,51 +4,118 @@
static int inside_git_dir = -1;
static int inside_work_tree = -1;
-const char *prefix_path(const char *prefix, int len, const char *path)
+static int sanitary_path_copy(char *dst, const char *src)
{
- const char *orig = path;
+ char *dst0 = dst;
+
+ if (*src == '/') {
+ *dst++ = '/';
+ while (*src == '/')
+ src++;
+ }
+
for (;;) {
- char c;
- if (*path != '.')
- break;
- c = path[1];
- /* "." */
- if (!c) {
- path++;
- break;
+ char c = *src;
+
+ /*
+ * A path component that begins with . could be
+ * special:
+ * (1) "." and ends -- ignore and terminate.
+ * (2) "./" -- ignore them, eat slash and continue.
+ * (3) ".." and ends -- strip one and terminate.
+ * (4) "../" -- strip one, eat slash and continue.
+ */
+ if (c == '.') {
+ switch (src[1]) {
+ case '\0':
+ /* (1) */
+ src++;
+ break;
+ case '/':
+ /* (2) */
+ src += 2;
+ while (*src == '/')
+ src++;
+ continue;
+ case '.':
+ switch (src[2]) {
+ case '\0':
+ /* (3) */
+ src += 2;
+ goto up_one;
+ case '/':
+ /* (4) */
+ src += 3;
+ while (*src == '/')
+ src++;
+ goto up_one;
+ }
+ }
}
- /* "./" */
+
+ /* copy up to the next '/', and eat all '/' */
+ while ((c = *src++) != '\0' && c != '/')
+ *dst++ = c;
if (c == '/') {
- path += 2;
- continue;
- }
- if (c != '.')
+ *dst++ = c;
+ while (c == '/')
+ c = *src++;
+ src--;
+ } else if (!c)
break;
- c = path[2];
- if (!c)
- path += 2;
- else if (c == '/')
- path += 3;
- else
- break;
- /* ".." and "../" */
- /* Remove last component of the prefix */
- do {
- if (!len)
- die("'%s' is outside repository", orig);
- len--;
- } while (len && prefix[len-1] != '/');
continue;
+
+ up_one:
+ /*
+ * dst0..dst is prefix portion, and dst[-1] is '/';
+ * go up one level.
+ */
+ dst -= 2; /* go past trailing '/' if any */
+ if (dst < dst0)
+ return -1;
+ while (1) {
+ if (dst <= dst0)
+ break;
+ c = *dst--;
+ if (c == '/') {
+ dst += 2;
+ break;
+ }
+ }
}
- if (len) {
- int speclen = strlen(path);
- char *n = xmalloc(speclen + len + 1);
+ *dst = '\0';
+ return 0;
+}
- memcpy(n, prefix, len);
- memcpy(n + len, path, speclen+1);
- path = n;
+const char *prefix_path(const char *prefix, int len, const char *path)
+{
+ const char *orig = path;
+ char *sanitized = xmalloc(len + strlen(path) + 1);
+ if (*orig == '/')
+ strcpy(sanitized, path);
+ else {
+ if (len)
+ memcpy(sanitized, prefix, len);
+ strcpy(sanitized + len, path);
}
- return path;
+ if (sanitary_path_copy(sanitized, sanitized))
+ goto error_out;
+ if (*orig == '/') {
+ const char *work_tree = get_git_work_tree();
+ size_t len = strlen(work_tree);
+ size_t total = strlen(sanitized) + 1;
+ if (strncmp(sanitized, work_tree, len) ||
+ (sanitized[len] != '\0' && sanitized[len] != '/')) {
+ error_out:
+ error("'%s' is outside repository", orig);
+ free(sanitized);
+ return NULL;
+ }
+ if (sanitized[len] == '/')
+ len++;
+ memmove(sanitized, sanitized + len, total - len);
+ }
+ return sanitized;
}
/*
@@ -114,7 +181,7 @@ void verify_non_filename(const char *prefix, const char *arg)
const char **get_pathspec(const char *prefix, const char **pathspec)
{
const char *entry = *pathspec;
- const char **p;
+ const char **src, **dst;
int prefixlen;
if (!prefix && !entry)
@@ -128,12 +195,19 @@ const char **get_pathspec(const char *prefix, const char **pathspec)
}
/* Otherwise we have to re-write the entries.. */
- p = pathspec;
+ src = pathspec;
+ dst = pathspec;
prefixlen = prefix ? strlen(prefix) : 0;
- do {
- *p = prefix_path(prefix, prefixlen, entry);
- } while ((entry = *++p) != NULL);
- return (const char **) pathspec;
+ while (*src) {
+ const char *p = prefix_path(prefix, prefixlen, *src);
+ if (p)
+ *(dst++) = p;
+ src++;
+ }
+ *dst = NULL;
+ if (!*pathspec)
+ return NULL;
+ return pathspec;
}
/*