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authorDaniel Axtens <dja@axtens.net>2021-07-21 14:00:28 +1000
committerVasant Hegde <hegdevasant@linux.vnet.ibm.com>2021-07-22 12:10:28 +0530
commit1590ee210247480db7eb29c76971f4e2006b6d86 (patch)
treedd67e2069cbc229219c3ea94c589265ff4d082b5
parentdfa6c9c7ae178174a0cb48150a96032f657f0609 (diff)
downloadskiboot-1590ee210247480db7eb29c76971f4e2006b6d86.zip
skiboot-1590ee210247480db7eb29c76971f4e2006b6d86.tar.gz
skiboot-1590ee210247480db7eb29c76971f4e2006b6d86.tar.bz2
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>
-rw-r--r--libstb/secvar/backend/edk2-compat-process.c3
-rw-r--r--libstb/secvar/test/data/KEKeslcorrupt.h161
-rw-r--r--libstb/secvar/test/secvar-test-edk2-compat.c18
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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+,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
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+,0xf7 ,0xca ,0xca ,0xf1 ,0x04 ,0x90 ,0x4d ,0x6b ,0x57 ,0xc1 ,0xe5 ,0x85 ,0xfd ,0x87 ,0x09 ,0xe5
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+,0xa4 ,0xfc ,0xaa ,0x40 ,0x02 ,0x7c ,0x57 ,0xd9 ,0x73 ,0xc6 ,0xc0 ,0x59 ,0xcb ,0x47 ,0x71 ,0x07
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+,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);