Replace any '\' char with '\\' in table specification on input.

Device-mapper in kernel uses '\' as escape character so it's better
to double it to avoid any confusion when using existing device names
with '\' in the table specification.

For example:

dmsetup create x --table "0 8 linear /dev/mapper/a\x20b 0"

should pass just fine now without a need to explicitly escape the '\' char
like this:

dmsetup create x --table "0 8 linear /dev/mapper/a\\x20b 0"

1 files changed, 22 insertions, 3 deletions

diff --git a/libdm/ioctl/libdm-iface.c b/libdm/ioctl/libdm-iface.c
index c5734e33..f6795997 100644
--- a/libdm/ioctl/libdm-iface.c
+++ b/libdm/ioctl/libdm-iface.c
@@ -866,7 +866,9 @@ static char *_add_target(struct target *t, char *out, char *end)
 	char *out_sp = out;
 	struct dm_target_spec sp;
 	size_t sp_size = sizeof(struct dm_target_spec);
+	unsigned int backslash_count = 0;
 	int len;
+	char *pt;
 
 	if (strlen(t->type) >= sizeof(sp.target_type)) {
 		log_error("Target type name %s is too long.", t->type);
@@ -880,15 +882,32 @@ static char *_add_target(struct target *t, char *out, char *end)
 	sp.target_type[sizeof(sp.target_type) - 1] = '\0';
 
 	out += sp_size;
-	len = strlen(t->params);
+	pt = t->params;
+
+	while (*pt)
+		if (*pt++ == '\\')
+			backslash_count++;
+	len = strlen(t->params) + backslash_count;
 
 	if ((out >= end) || (out + len + 1) >= end) {
 		log_error("Ran out of memory building ioctl parameter");
 		return NULL;
 	}
 
-	strcpy(out, t->params);
-	out += len + 1;
+	if (backslash_count) {
+		/* replace "\" with "\\" */
+		pt = t->params;
+		do {
+			if (*pt == '\\')
+				*out++ = '\\';
+			*out++ = *pt++;
+		} while (*pt);
+		*out++ = '\0';
+	}
+	else {
+		strcpy(out, t->params);
+		out += len + 1;
+	}
 
 	/* align next block */
 	out = _align(out, ALIGNMENT);