* [PATCH AUTOSEL 6.1 16/24] verify_pefile: relax wrapper length check
[not found] <20230401014242.3356780-1-sashal@kernel.org>
@ 2023-04-01 1:42 ` Sasha Levin
2023-04-01 1:42 ` [PATCH AUTOSEL 6.1 17/24] asymmetric_keys: log on fatal failures in PE/pkcs7 Sasha Levin
1 sibling, 0 replies; 2+ messages in thread
From: Sasha Levin @ 2023-04-01 1:42 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Robbie Harwood, David Howells, Jarkko Sakkinen, Eric Biederman,
Herbert Xu, keyrings, linux-crypto, kexec, Sasha Levin, davem
From: Robbie Harwood <rharwood@redhat.com>
[ Upstream commit 4fc5c74dde69a7eda172514aaeb5a7df3600adb3 ]
The PE Format Specification (section "The Attribute Certificate Table
(Image Only)") states that `dwLength` is to be rounded up to 8-byte
alignment when used for traversal. Therefore, the field is not required
to be an 8-byte multiple in the first place.
Accordingly, pesign has not performed this alignment since version
0.110. This causes kexec failure on pesign'd binaries with "PEFILE:
Signature wrapper len wrong". Update the comment and relax the check.
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jarkko Sakkinen <jarkko@kernel.org>
cc: Eric Biederman <ebiederm@xmission.com>
cc: Herbert Xu <herbert@gondor.apana.org.au>
cc: keyrings@vger.kernel.org
cc: linux-crypto@vger.kernel.org
cc: kexec@lists.infradead.org
Link: https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#the-attribute-certificate-table-image-only
Link: https://github.com/rhboot/pesign
Link: https://lore.kernel.org/r/20230220171254.592347-2-rharwood@redhat.com/ # v2
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
crypto/asymmetric_keys/verify_pefile.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/crypto/asymmetric_keys/verify_pefile.c b/crypto/asymmetric_keys/verify_pefile.c
index 7553ab18db898..fe1bb374239d7 100644
--- a/crypto/asymmetric_keys/verify_pefile.c
+++ b/crypto/asymmetric_keys/verify_pefile.c
@@ -135,11 +135,15 @@ static int pefile_strip_sig_wrapper(const void *pebuf,
pr_debug("sig wrapper = { %x, %x, %x }\n",
wrapper.length, wrapper.revision, wrapper.cert_type);
- /* Both pesign and sbsign round up the length of certificate table
- * (in optional header data directories) to 8 byte alignment.
+ /* sbsign rounds up the length of certificate table (in optional
+ * header data directories) to 8 byte alignment. However, the PE
+ * specification states that while entries are 8-byte aligned, this is
+ * not included in their length, and as a result, pesign has not
+ * rounded up since 0.110.
*/
- if (round_up(wrapper.length, 8) != ctx->sig_len) {
- pr_debug("Signature wrapper len wrong\n");
+ if (wrapper.length > ctx->sig_len) {
+ pr_debug("Signature wrapper bigger than sig len (%x > %x)\n",
+ ctx->sig_len, wrapper.length);
return -ELIBBAD;
}
if (wrapper.revision != WIN_CERT_REVISION_2_0) {
--
2.39.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH AUTOSEL 6.1 17/24] asymmetric_keys: log on fatal failures in PE/pkcs7
[not found] <20230401014242.3356780-1-sashal@kernel.org>
2023-04-01 1:42 ` [PATCH AUTOSEL 6.1 16/24] verify_pefile: relax wrapper length check Sasha Levin
@ 2023-04-01 1:42 ` Sasha Levin
1 sibling, 0 replies; 2+ messages in thread
From: Sasha Levin @ 2023-04-01 1:42 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Robbie Harwood, David Howells, Jarkko Sakkinen, Eric Biederman,
Herbert Xu, keyrings, linux-crypto, kexec, Sasha Levin, davem
From: Robbie Harwood <rharwood@redhat.com>
[ Upstream commit 3584c1dbfffdabf8e3dc1dd25748bb38dd01cd43 ]
These particular errors can be encountered while trying to kexec when
secureboot lockdown is in place. Without this change, even with a
signed debug build, one still needs to reboot the machine to add the
appropriate dyndbg parameters (since lockdown blocks debugfs).
Accordingly, upgrade all pr_debug() before fatal error into pr_warn().
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jarkko Sakkinen <jarkko@kernel.org>
cc: Eric Biederman <ebiederm@xmission.com>
cc: Herbert Xu <herbert@gondor.apana.org.au>
cc: keyrings@vger.kernel.org
cc: linux-crypto@vger.kernel.org
cc: kexec@lists.infradead.org
Link: https://lore.kernel.org/r/20230220171254.592347-3-rharwood@redhat.com/ # v2
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
crypto/asymmetric_keys/pkcs7_verify.c | 10 +++++-----
crypto/asymmetric_keys/verify_pefile.c | 24 ++++++++++++------------
2 files changed, 17 insertions(+), 17 deletions(-)
diff --git a/crypto/asymmetric_keys/pkcs7_verify.c b/crypto/asymmetric_keys/pkcs7_verify.c
index f6321c785714c..3da32813e4412 100644
--- a/crypto/asymmetric_keys/pkcs7_verify.c
+++ b/crypto/asymmetric_keys/pkcs7_verify.c
@@ -79,16 +79,16 @@ static int pkcs7_digest(struct pkcs7_message *pkcs7,
}
if (sinfo->msgdigest_len != sig->digest_size) {
- pr_debug("Sig %u: Invalid digest size (%u)\n",
- sinfo->index, sinfo->msgdigest_len);
+ pr_warn("Sig %u: Invalid digest size (%u)\n",
+ sinfo->index, sinfo->msgdigest_len);
ret = -EBADMSG;
goto error;
}
if (memcmp(sig->digest, sinfo->msgdigest,
sinfo->msgdigest_len) != 0) {
- pr_debug("Sig %u: Message digest doesn't match\n",
- sinfo->index);
+ pr_warn("Sig %u: Message digest doesn't match\n",
+ sinfo->index);
ret = -EKEYREJECTED;
goto error;
}
@@ -478,7 +478,7 @@ int pkcs7_supply_detached_data(struct pkcs7_message *pkcs7,
const void *data, size_t datalen)
{
if (pkcs7->data) {
- pr_debug("Data already supplied\n");
+ pr_warn("Data already supplied\n");
return -EINVAL;
}
pkcs7->data = data;
diff --git a/crypto/asymmetric_keys/verify_pefile.c b/crypto/asymmetric_keys/verify_pefile.c
index fe1bb374239d7..22beaf2213a22 100644
--- a/crypto/asymmetric_keys/verify_pefile.c
+++ b/crypto/asymmetric_keys/verify_pefile.c
@@ -74,7 +74,7 @@ static int pefile_parse_binary(const void *pebuf, unsigned int pelen,
break;
default:
- pr_debug("Unknown PEOPT magic = %04hx\n", pe32->magic);
+ pr_warn("Unknown PEOPT magic = %04hx\n", pe32->magic);
return -ELIBBAD;
}
@@ -95,7 +95,7 @@ static int pefile_parse_binary(const void *pebuf, unsigned int pelen,
ctx->certs_size = ddir->certs.size;
if (!ddir->certs.virtual_address || !ddir->certs.size) {
- pr_debug("Unsigned PE binary\n");
+ pr_warn("Unsigned PE binary\n");
return -ENODATA;
}
@@ -127,7 +127,7 @@ static int pefile_strip_sig_wrapper(const void *pebuf,
unsigned len;
if (ctx->sig_len < sizeof(wrapper)) {
- pr_debug("Signature wrapper too short\n");
+ pr_warn("Signature wrapper too short\n");
return -ELIBBAD;
}
@@ -142,16 +142,16 @@ static int pefile_strip_sig_wrapper(const void *pebuf,
* rounded up since 0.110.
*/
if (wrapper.length > ctx->sig_len) {
- pr_debug("Signature wrapper bigger than sig len (%x > %x)\n",
- ctx->sig_len, wrapper.length);
+ pr_warn("Signature wrapper bigger than sig len (%x > %x)\n",
+ ctx->sig_len, wrapper.length);
return -ELIBBAD;
}
if (wrapper.revision != WIN_CERT_REVISION_2_0) {
- pr_debug("Signature is not revision 2.0\n");
+ pr_warn("Signature is not revision 2.0\n");
return -ENOTSUPP;
}
if (wrapper.cert_type != WIN_CERT_TYPE_PKCS_SIGNED_DATA) {
- pr_debug("Signature certificate type is not PKCS\n");
+ pr_warn("Signature certificate type is not PKCS\n");
return -ENOTSUPP;
}
@@ -164,7 +164,7 @@ static int pefile_strip_sig_wrapper(const void *pebuf,
ctx->sig_offset += sizeof(wrapper);
ctx->sig_len -= sizeof(wrapper);
if (ctx->sig_len < 4) {
- pr_debug("Signature data missing\n");
+ pr_warn("Signature data missing\n");
return -EKEYREJECTED;
}
@@ -198,7 +198,7 @@ static int pefile_strip_sig_wrapper(const void *pebuf,
return 0;
}
not_pkcs7:
- pr_debug("Signature data not PKCS#7\n");
+ pr_warn("Signature data not PKCS#7\n");
return -ELIBBAD;
}
@@ -341,8 +341,8 @@ static int pefile_digest_pe(const void *pebuf, unsigned int pelen,
digest_size = crypto_shash_digestsize(tfm);
if (digest_size != ctx->digest_len) {
- pr_debug("Digest size mismatch (%zx != %x)\n",
- digest_size, ctx->digest_len);
+ pr_warn("Digest size mismatch (%zx != %x)\n",
+ digest_size, ctx->digest_len);
ret = -EBADMSG;
goto error_no_desc;
}
@@ -373,7 +373,7 @@ static int pefile_digest_pe(const void *pebuf, unsigned int pelen,
* PKCS#7 certificate.
*/
if (memcmp(digest, ctx->digest, ctx->digest_len) != 0) {
- pr_debug("Digest mismatch\n");
+ pr_warn("Digest mismatch\n");
ret = -EKEYREJECTED;
} else {
pr_debug("The digests match!\n");
--
2.39.2
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2023-04-01 1:42 ` [PATCH AUTOSEL 6.1 16/24] verify_pefile: relax wrapper length check Sasha Levin
2023-04-01 1:42 ` [PATCH AUTOSEL 6.1 17/24] asymmetric_keys: log on fatal failures in PE/pkcs7 Sasha Levin
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