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Fix not checking hashed data size

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R=wfrichar@chromium.org,gauravsh@chromium.org
BUG=chrome-os-partner:2909
TEST=make && make runtests

Review URL: http://codereview.chromium.org/6748009

Change-Id: I3251aa6e6dd62ff4351fdf33ca9182b19a29cbbf
This commit is contained in:
Randall Spangler
2011-03-25 15:20:58 -07:00
parent d583a30a7c
commit ac7c2d9e30
1 changed files with 7 additions and 0 deletions
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7
firmware/lib/vboot_common.c
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@@ -216,6 +216,12 @@ int KeyBlockVerify(const VbKeyBlockHeader* block, uint64_t size,
return VBOOT_KEY_BLOCK_INVALID;
}
/* Make sure advertised signature data sizes are sane. */
if (block->key_block_size < sig->data_size) {
VBDEBUG(("Signature calculated past end of the block\n"));
return VBOOT_KEY_BLOCK_INVALID;
}
VBDEBUG(("Checking key block hash only...\n"));
header_checksum = DigestBuf((const uint8_t*)block, sig->data_size,
SHA512_DIGEST_ALGORITHM);
@@ -249,6 +255,7 @@ int KeyBlockVerify(const VbKeyBlockHeader* block, uint64_t size,
VBDEBUG(("Signature calculated past end of the block\n"));
return VBOOT_KEY_BLOCK_INVALID;
}
VBDEBUG(("Checking key block signature...\n"));
rv = VerifyData((const uint8_t*)block, size, sig, rsa);
RSAPublicKeyFree(rsa);