[PROCFS 3/5] cryptodisk: Add crypto disk name and source device names to (proc)/luks_script

[Glenn Washburn]

It can be difficult to determine what device backs a particular (cryptoN)
device because they are automatically generated. This allows users to see
in the grub shell which devices back which crypto devices.

Signed-off-by: Glenn Washburn <development@efficientek.com>
---
 grub-core/disk/cryptodisk.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/grub-core/disk/cryptodisk.c b/grub-core/disk/cryptodisk.c
index bb9e1a946..be97dfab9 100644
--- a/grub-core/disk/cryptodisk.c
+++ b/grub-core/disk/cryptodisk.c
@@ -1211,25 +1211,36 @@ hex (grub_uint8_t val)
 }
 
 /* Open a file named NAME and initialize FILE.  */
+#define STR(s) #s
+#define MAX_ID_PRINT 10000
 static char *
 luks_script_get (grub_size_t *sz)
 {
   grub_cryptodisk_t i;
   grub_size_t size = 0;
   char *ptr, *ret;
+  static char errmsg[] = N_("Can not list more than " STR(MAX_ID_PRINT)
+                           " crypto devices.\n");
 
   *sz = 0;
 
   for (i = cryptodisk_list; i != NULL; i = i->next)
-    if (grub_strcmp (i->modname, "luks") == 0 ||
-       grub_strcmp (i->modname, "luks2") == 0)
+    if (i->id >= MAX_ID_PRINT)
+      {
+       *sz = sizeof (errmsg);
+       return errmsg;
+      }
+    else if (grub_strcmp (i->modname, "luks") == 0 ||
+            grub_strcmp (i->modname, "luks2") == 0)
       {
        size += grub_strlen (i->modname);
        size += sizeof ("_mount");
+       size += sizeof ("crypto");
+       size += grub_strlen (i->source);
        size += grub_strlen (i->uuid);
        size += grub_strlen (i->cipher->cipher->name);
-       /* mode + mode_iv + spaces + offset + sector size + ??? + '\n' */
-       size += 5 + 8 + 5 + 20 + 4 + 16 + 1;
+       /* spaces + maxidlen + mode + mode_iv + offset + sector size + ??? + 
'\n' */
+       size += 7 + sizeof (STR(MAX_ID_PRINT)) + 5 + 8 + 20 + 4 + 16 + 1;
        if (i->essiv_hash)
          size += grub_strlen (i->essiv_hash->name);
        size += i->keysize * 2;
@@ -1249,6 +1260,9 @@ luks_script_get (grub_size_t *sz)
        const char *iptr;
        ptr = grub_stpcpy (ptr, i->modname);
        ptr = grub_stpcpy (ptr, "_mount ");
+       ptr += grub_snprintf (ptr, 8 + sizeof (STR(MAX_ID_PRINT)), "crypto%lu 
", i->id);
+       ptr = grub_stpcpy (ptr, i->source);
+       *ptr++ = ' ';
        ptr = grub_stpcpy (ptr, i->uuid);
        *ptr++ = ' ';
        ptr += grub_snprintf (ptr, 21, "%" PRIuGRUB_UINT64_T " ",
-- 
2.27.0