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authorMiklos Szeredi <mszeredi@suse.cz>2014-11-20 18:40:00 +0300
committerMiklos Szeredi <mszeredi@suse.cz>2014-11-20 18:40:00 +0300
commit91c77947133f7aef851b625701e182d3f99d14a9 (patch)
tree9ba1e0db29e4b7e6835d32bae45ec45b62371896 /fs
parent521484639ec19a6f1ed56de6993feb255f5f676c (diff)
downloadlinux-91c77947133f7aef851b625701e182d3f99d14a9.tar.xz
ovl: allow filenames with comma
Allow option separator (comma) to be escaped with backslash. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs')
-rw-r--r--fs/overlayfs/super.c48
1 files changed, 45 insertions, 3 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index b92bd1829cf7..eee7a62e1c0e 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -462,11 +462,34 @@ static const match_table_t ovl_tokens = {
{OPT_ERR, NULL}
};
+static char *ovl_next_opt(char **s)
+{
+ char *sbegin = *s;
+ char *p;
+
+ if (sbegin == NULL)
+ return NULL;
+
+ for (p = sbegin; *p; p++) {
+ if (*p == '\\') {
+ p++;
+ if (!*p)
+ break;
+ } else if (*p == ',') {
+ *p = '\0';
+ *s = p + 1;
+ return sbegin;
+ }
+ }
+ *s = NULL;
+ return sbegin;
+}
+
static int ovl_parse_opt(char *opt, struct ovl_config *config)
{
char *p;
- while ((p = strsep(&opt, ",")) != NULL) {
+ while ((p = ovl_next_opt(&opt)) != NULL) {
int token;
substring_t args[MAX_OPT_ARGS];
@@ -554,15 +577,34 @@ out_dput:
goto out_unlock;
}
+static void ovl_unescape(char *s)
+{
+ char *d = s;
+
+ for (;; s++, d++) {
+ if (*s == '\\')
+ s++;
+ *d = *s;
+ if (!*s)
+ break;
+ }
+}
+
static int ovl_mount_dir(const char *name, struct path *path)
{
int err;
+ char *tmp = kstrdup(name, GFP_KERNEL);
+
+ if (!tmp)
+ return -ENOMEM;
- err = kern_path(name, LOOKUP_FOLLOW, path);
+ ovl_unescape(tmp);
+ err = kern_path(tmp, LOOKUP_FOLLOW, path);
if (err) {
- pr_err("overlayfs: failed to resolve '%s': %i\n", name, err);
+ pr_err("overlayfs: failed to resolve '%s': %i\n", tmp, err);
err = -EINVAL;
}
+ kfree(tmp);
return err;
}