secvar/backend: fix an integer underflow bug

[ Upstream commit 0c265ace91b9d9ee08e09392a7d4a78a1301a3ab ]

If a declared size is smaller than uuid size, we end up allocating
with an allocation of a 'negative' number, which is a huge 64 bit
number.

This will probably then fail with an OPAL_NO_MEM, but it will be
better to catch it and return OPAL_PARAMETER instead.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Nayna Jain <nayna@linux.ibm.com>
Tested-by: Nayna Jain <nayna@linux.ibm.com>
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>

3 files changed, 182 insertions, 0 deletions

diff --git a/libstb/secvar/backend/edk2-compat-process.c b/libstb/secvar/backend/edk2-compat-process.c
index 99fe106..c5113b7 100644
--- a/libstb/secvar/backend/edk2-compat-process.c
+++ b/libstb/secvar/backend/edk2-compat-process.c
@@ -123,6 +123,9 @@ static int get_esl_cert(const char *buf, const size_t buflen, char **cert)
 
 	assert(cert != NULL);
 
+	if (le32_to_cpu(list->SignatureSize) <= sizeof(uuid_t))
+		return OPAL_PARAMETER;
+
 	size = le32_to_cpu(list->SignatureSize) - sizeof(uuid_t);
 
 	prlog(PR_DEBUG,"size of signature list size is %u\n",
diff --git a/libstb/secvar/test/data/KEKeslcorrupt.h b/libstb/secvar/test/data/KEKeslcorrupt.h
new file mode 100644
index 0000000..ba5cdf8
--- /dev/null
+++ b/libstb/secvar/test/data/KEKeslcorrupt.h
@@ -0,0 +1,161 @@
+unsigned char KEKeslcorrupt_auth[]  = {
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+,0x78 ,0x5b ,0x06 ,0xc1 ,0xeb ,0xbe ,0x4e ,0xd7  ,0xd9 ,0xe9 ,0x57 ,0x1f ,0xc4 ,0xf4 ,0xe5 ,0x78
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+,0xa4 ,0x81 ,0xf8 ,0x7d ,0x09 ,0x0e ,0xa6 ,0x6a  ,0xe1 ,0xf7 ,0xcb ,0xe9 ,0x63 ,0xd6 ,0xd6 ,0x58
+,0x28 ,0x10 ,0xf2 ,0xb9 ,0xcf ,0xd7 ,0x85 ,0x95  ,0x0b ,0x24 ,0x51 ,0xe8 ,0x5a ,0x08 ,0x74 ,0xbc
+,0x42 ,0x9b ,0xd6 ,0x84 ,0xcd ,0x5e ,0xe5 ,0x61  ,0x83 ,0x7c ,0x5f ,0x0e ,0x3a ,0x9d ,0x3d ,0x6d
+,0x84 ,0xe2 ,0xc0 ,0x26 ,0x64 ,0x35 ,0x80 ,0x6c  ,0xb1 ,0x37 ,0x72 ,0x38 ,0x00 ,0xa0 ,0x90 ,0x51
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+,0xed ,0x08 ,0xba ,0xde ,0x42 ,0x90 ,0x00 ,0xb7  ,0x19 ,0x81 ,0x91 ,0xd0 ,0x18 ,0xcb ,0x03 ,0xe6
+,0xf5 ,0xf9 ,0x31 ,0x2b ,0x56 ,0xc3 ,0x21 ,0x39  ,0x4d ,0x9a ,0x63 ,0x0a ,0xb7 ,0x1c ,0xa9 ,0xdc
+,0xce ,0xa9 ,0xc4 ,0xe0 ,0x0a ,0xa4 ,0x53 ,0x8f  ,0x78 ,0xd1 ,0xc0 ,0x3f ,0xc2 ,0x8e ,0x8a ,0x37
+,0x52 ,0x42 ,0x60 ,0x97 ,0xb3 ,0x53 ,0xaa ,0xa4  ,0x4f ,0x98 ,0x7e ,0xa5 ,0x2a ,0xe1 ,0x52 ,0xfa
+,0x9f ,0xc1 ,0x32 ,0xf7 ,0x15 ,0x12 ,0x62 ,0x6b  ,0x5a ,0x4d ,0xfe ,0x22 ,0x8d ,0x88 ,0x87 ,0xfd
+,0x83 ,0x2f ,0xaa ,0x1a ,0xb8 ,0xad ,0x3d ,0x4f  ,0xdc ,0xe0 ,0x39 ,0x8b ,0x88 ,0xed ,0xc6 ,0xf5
+,0xee ,0x32 ,0xea ,0xd6 ,0x25 ,0xcf ,0x91 ,0x66  ,0x77 ,0x4c ,0xa1 ,0x0c ,0x6a ,0x7b ,0x6e ,0xb2
+,0x72 ,0xa8 ,0xf4 ,0xc7 ,0xeb ,0xa4 ,0x91 ,0xda  ,0x5d ,0x14 ,0xf9 ,0x9e ,0xe9 ,0x02 ,0x03 ,0x01
+,0x00 ,0x01 ,0xa3 ,0x53 ,0x30 ,0x51 ,0x30 ,0x1d  ,0x06 ,0x03 ,0x55 ,0x1d ,0x0e ,0x04 ,0x16 ,0x04
+,0x14 ,0x78 ,0x48 ,0xa9 ,0x71 ,0x20 ,0x25 ,0xcf  ,0x26 ,0xe8 ,0x18 ,0x91 ,0x75 ,0xd6 ,0xad ,0xb1
+,0x5f ,0x7f ,0x6b ,0x7f ,0x6d ,0x30 ,0x1f ,0x06  ,0x03 ,0x55 ,0x1d ,0x23 ,0x04 ,0x18 ,0x30 ,0x16
+,0x80 ,0x14 ,0x78 ,0x48 ,0xa9 ,0x71 ,0x20 ,0x25  ,0xcf ,0x26 ,0xe8 ,0x18 ,0x91 ,0x75 ,0xd6 ,0xad
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+,0x0d ,0x01 ,0x01 ,0x0b ,0x05 ,0x00 ,0x03 ,0x82  ,0x01 ,0x01 ,0x00 ,0x7a ,0xc8 ,0xc9 ,0x0e ,0x45
+,0x1c ,0xa6 ,0xce ,0xd5 ,0xdb ,0x9c ,0x5d ,0x95  ,0x8b ,0x8b ,0xbc ,0x90 ,0xca ,0x98 ,0xd1 ,0xe9
+,0x4b ,0xfb ,0xf3 ,0xef ,0x48 ,0xb0 ,0x9e ,0x0d  ,0x95 ,0x0f ,0x3a ,0xa0 ,0xb6 ,0x93 ,0x9f ,0xc6
+,0xf7 ,0xca ,0xca ,0xf1 ,0x04 ,0x90 ,0x4d ,0x6b  ,0x57 ,0xc1 ,0xe5 ,0x85 ,0xfd ,0x87 ,0x09 ,0xe5
+,0xaf ,0x98 ,0x89 ,0x32 ,0x27 ,0x35 ,0x85 ,0xcf  ,0xe1 ,0x1f ,0xaf ,0xc0 ,0x8c ,0x3f ,0x2a ,0xba
+,0xa4 ,0xfc ,0xaa ,0x40 ,0x02 ,0x7c ,0x57 ,0xd9  ,0x73 ,0xc6 ,0xc0 ,0x59 ,0xcb ,0x47 ,0x71 ,0x07
+,0x1a ,0xfe ,0x46 ,0xb1 ,0x81 ,0x14 ,0x6b ,0xa5  ,0xeb ,0xe7 ,0x9c ,0x2b ,0x87 ,0xee ,0x72 ,0x96
+,0xe0 ,0xb0 ,0x11 ,0x86 ,0x33 ,0x95 ,0xdf ,0x6e  ,0x9c ,0x3f ,0x0f ,0xc1 ,0x46 ,0x8c ,0x53 ,0x12
+,0xf1 ,0xd9 ,0xa8 ,0xee ,0x04 ,0xc5 ,0x71 ,0x52  ,0x22 ,0x13 ,0x0f ,0x91 ,0x0c ,0x73 ,0xca ,0x34
+,0xb1 ,0x36 ,0x5f ,0x8c ,0x2e ,0x0f ,0x3a ,0x04  ,0x42 ,0xfe ,0x45 ,0x82 ,0x29 ,0x56 ,0x5e ,0xe5
+,0x4c ,0xeb ,0x4b ,0xa6 ,0xe5 ,0xe0 ,0x1d ,0x74  ,0xc0 ,0x5a ,0x2f ,0x42 ,0xa5 ,0xf2 ,0x65 ,0xd5
+,0x4d ,0x3b ,0x22 ,0xd2 ,0x96 ,0x42 ,0xcf ,0xbd  ,0xd7 ,0x8b ,0x37 ,0x7a ,0xb6 ,0xd9 ,0xd4 ,0xd7
+,0x45 ,0x47 ,0x3b ,0x3c ,0xb3 ,0xd9 ,0x29 ,0x69  ,0x91 ,0x7d ,0x4c ,0x06 ,0xad ,0x6c ,0xea ,0x62
+,0xf1 ,0xf7 ,0xec ,0x67 ,0xae ,0xd5 ,0x43 ,0xd0  ,0xab ,0xb8 ,0xbf ,0xa4 ,0x28 ,0xd4 ,0x75 ,0xd2
+,0x3f ,0x53 ,0x5d ,0xa8 ,0x09 ,0x46 ,0x89 ,0x7f  ,0x84 ,0x36 ,0xad ,0x78 ,0x41 ,0x03 ,0xf4 ,0xc4
+,0x43 ,0x43 ,0xdc ,0x52 ,0xc6 ,0xff ,0xab ,0xd6  ,0x8c ,0x7f ,0xc0 ,0xab ,0x67 ,0x5b ,0x0b ,0xa9
+,0x6a ,0xd2 ,0x85 ,0x71 ,0x9f ,0xc2 ,0xf1 ,0x96  ,0xd2 ,0x41 ,0xb0 };
+
+unsigned int KEKeslcorrupt_auth_len = 2523;
diff --git a/libstb/secvar/test/secvar-test-edk2-compat.c b/libstb/secvar/test/secvar-test-edk2-compat.c
index a3b1613..4952a4b 100644
--- a/libstb/secvar/test/secvar-test-edk2-compat.c
+++ b/libstb/secvar/test/secvar-test-edk2-compat.c
@@ -13,6 +13,7 @@
 #include "./data/invalidkek.h"
 #include "./data/malformedkek.h"
 #include "./data/trimmedKEK.h"
+#include "./data/KEKeslcorrupt.h"
 #include "./data/db.h"
 #include "./data/dbsigneddata.h"
 #include "./data/OldTSKEK.h"
@@ -272,6 +273,23 @@ int run_test()
 	ASSERT(0 == tmp->data_size);
 	free(data);
 
+	/* KEK with corrupted ESL SignatureSize */
+	printf("KEK with corrupt ESL SignatureSize\n");
+	tmp = new_secvar("KEK", 4, KEKeslcorrupt_auth, KEKeslcorrupt_auth_len, 0);
+	ASSERT(0 == edk2_compat_validate(tmp));
+	list_add_tail(&update_bank, &tmp->link);
+	ASSERT(1 == list_length(&update_bank));
+
+	rc = edk2_compat_process(&variable_bank, &update_bank);
+	/* If we don't catch the error, we get OPAL_NO_MEM instead */
+	ASSERT(OPAL_PARAMETER == rc);
+	ASSERT(5 == list_length(&variable_bank));
+	ASSERT(0 == list_length(&update_bank));
+	tmp = find_secvar("KEK", 4, &variable_bank);
+	ASSERT(NULL != tmp);
+	ASSERT(0 == tmp->data_size);
+
+
 	/* Add valid KEK, .process(), succeeds. */
 	printf("Add KEK");
 	tmp = new_secvar("KEK", 4, KEK_auth, KEK_auth_len, 0);