trusted-keys: check hex2bin result
For each hex2bin call in trusted keys, check that the ascii hex string is
valid. On failure, return -EINVAL.
Changelog v1:
- hex2bin now returns an int
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index 0c33e2e..0964fc2 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -779,7 +779,10 @@
opt->pcrinfo_len = strlen(args[0].from) / 2;
if (opt->pcrinfo_len > MAX_PCRINFO_SIZE)
return -EINVAL;
- hex2bin(opt->pcrinfo, args[0].from, opt->pcrinfo_len);
+ res = hex2bin(opt->pcrinfo, args[0].from,
+ opt->pcrinfo_len);
+ if (res < 0)
+ return -EINVAL;
break;
case Opt_keyhandle:
res = strict_strtoul(args[0].from, 16, &handle);
@@ -791,12 +794,18 @@
case Opt_keyauth:
if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE)
return -EINVAL;
- hex2bin(opt->keyauth, args[0].from, SHA1_DIGEST_SIZE);
+ res = hex2bin(opt->keyauth, args[0].from,
+ SHA1_DIGEST_SIZE);
+ if (res < 0)
+ return -EINVAL;
break;
case Opt_blobauth:
if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE)
return -EINVAL;
- hex2bin(opt->blobauth, args[0].from, SHA1_DIGEST_SIZE);
+ res = hex2bin(opt->blobauth, args[0].from,
+ SHA1_DIGEST_SIZE);
+ if (res < 0)
+ return -EINVAL;
break;
case Opt_migratable:
if (*args[0].from == '0')
@@ -860,7 +869,9 @@
p->blob_len = strlen(c) / 2;
if (p->blob_len > MAX_BLOB_SIZE)
return -EINVAL;
- hex2bin(p->blob, c, p->blob_len);
+ ret = hex2bin(p->blob, c, p->blob_len);
+ if (ret < 0)
+ return -EINVAL;
ret = getoptions(datablob, p, o);
if (ret < 0)
return ret;