From e58ccbdf1c7d259cbac06105b194b06be849f961 Mon Sep 17 00:00:00 2001 From: Daniel Axtens Date: Wed, 21 Jul 2021 14:00:28 +1000 Subject: 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 Reviewed-by: Nayna Jain Tested-by: Nayna Jain Signed-off-by: Vasant Hegde --- libstb/secvar/backend/edk2-compat-process.c | 3 + libstb/secvar/test/data/KEKeslcorrupt.h | 161 +++++++++++++++++++++++++++ libstb/secvar/test/secvar-test-edk2-compat.c | 18 +++ 3 files changed, 182 insertions(+) create mode 100644 libstb/secvar/test/data/KEKeslcorrupt.h 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[] = { +0xe4 ,0x07 ,0x09 ,0x0e ,0x0e ,0x22 ,0x2e ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 +,0xd3 ,0x05 ,0x00 ,0x00 ,0x00 ,0x02 ,0xf1 ,0x0e ,0x9d ,0xd2 ,0xaf ,0x4a ,0xdf ,0x68 ,0xee ,0x49 +,0x8a ,0xa9 ,0x34 ,0x7d ,0x37 ,0x56 ,0x65 ,0xa7 ,0x30 ,0x82 ,0x05 ,0xb7 ,0x06 ,0x09 ,0x2a ,0x86 +,0x48 ,0x86 ,0xf7 ,0x0d ,0x01 ,0x07 ,0x02 ,0xa0 ,0x82 ,0x05 ,0xa8 ,0x30 ,0x82 ,0x05 ,0xa4 ,0x02 +,0x01 ,0x01 ,0x31 ,0x0f ,0x30 ,0x0d ,0x06 ,0x09 ,0x60 ,0x86 ,0x48 ,0x01 ,0x65 ,0x03 ,0x04 ,0x02 +,0x01 ,0x05 ,0x00 ,0x30 ,0x0b ,0x06 ,0x09 ,0x2a ,0x86 ,0x48 ,0x86 ,0xf7 ,0x0d ,0x01 ,0x07 ,0x01 +,0xa0 ,0x82 ,0x03 ,0xca ,0x30 ,0x82 ,0x03 ,0xc6 ,0x30 ,0x82 ,0x02 ,0xae ,0xa0 ,0x03 ,0x02 ,0x01 +,0x02 ,0x02 ,0x09 ,0x00 ,0xda ,0xf3 ,0xf9 ,0x20 ,0x41 ,0x00 ,0xa8 ,0xeb ,0x30 ,0x0d ,0x06 ,0x09 +,0x2a ,0x86 ,0x48 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"./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); -- cgit v1.1