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Clear Asan finding in VMAC under 32-bit inline ASM (GH #860) 

This one has been nagging us for a while. Tested OK under i686 and x86_64.
pull/867/head
Jeffrey Walton 2019-07-05 03:38:03 -04:00
parent 6bead34bd9
commit f7986129df
No known key found for this signature in database
GPG Key ID: B36AB348921B1838
2 changed files with 12 additions and 13 deletions
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21
vmac.cpp
View File

@ -184,23 +184,21 @@ __attribute__ ((noinline)) // Intel Compiler 9.1 workaround
#endif
VMAC_Base::VHASH_Update_SSE2(const word64 *data, size_t blocksRemainingInWord64, int tagPart)
{
CRYPTOPP_ASSERT(IsAlignedOn(m_polyState(),GetAlignmentOf<word64>()));
CRYPTOPP_ASSERT(IsAlignedOn(m_nhKey(),GetAlignmentOf<word64>()));
const word64 *nhK = m_nhKey();
word64 *polyS = (word64*)(void*)m_polyState();
word32 L1KeyLength = m_L1KeyLength;
// These are used in the ASM, but some analysis engines cnnot determine it.
CRYPTOPP_UNUSED(data); CRYPTOPP_UNUSED(tagPart); CRYPTOPP_UNUSED(L1KeyLength);
// These are used in the ASM, but some analysis services miss it.
CRYPTOPP_UNUSED(data); CRYPTOPP_UNUSED(tagPart);
CRYPTOPP_UNUSED(L1KeyLength);
CRYPTOPP_UNUSED(blocksRemainingInWord64);
#ifdef __GNUC__
word32 temp;
__asm__ __volatile__
(
AS2( mov %%ebx, %0)
AS2( mov %1, %%ebx)
AS1( push %%ebx)
AS2( mov %0, %%ebx)
INTEL_NOPREFIX
#else
#if defined(__INTEL_COMPILER)
@ -419,10 +417,11 @@ VMAC_Base::VHASH_Update_SSE2(const word64 *data, size_t blocksRemainingInWord64,
AS_POP_IF86( bp)
AS1( emms)
#ifdef __GNUC__
AS1( pop %%ebx)
ATT_PREFIX
AS2( mov %0, %%ebx)
: "=m" (temp)
: "m" (L1KeyLength), "c" (blocksRemainingInWord64), "S" (data), "D" (nhK+tagPart*2), "d" (m_isFirstBlock), "a" (polyS+tagPart*4)
:
: "m" (L1KeyLength), "c" (blocksRemainingInWord64), "S" (data),
"D" (nhK+tagPart*2), "d" (m_isFirstBlock), "a" (polyS+tagPart*4)
: "memory", "cc"
);
#endif

4
vmac.h
View File

@ -52,10 +52,10 @@ protected:
void VHASH_Update_Template(const word64 *data, size_t blockRemainingInWord128);
void VHASH_Update(const word64 *data, size_t blocksRemainingInWord128);
CRYPTOPP_BLOCK_1(polyState, word64, 4*(m_is128+1))
CRYPTOPP_BLOCK_1(polyState, word64, (m_is128 ? 8 : 4))
CRYPTOPP_BLOCK_2(nhKey, word64, m_L1KeyLength/sizeof(word64) + 2*m_is128)
CRYPTOPP_BLOCK_3(data, byte, m_L1KeyLength)
CRYPTOPP_BLOCK_4(l3Key, word64, 2*(m_is128+1))
CRYPTOPP_BLOCK_4(l3Key, word64, (m_is128 ? 4 : 2))
CRYPTOPP_BLOCK_5(nonce, byte, IVSize())
CRYPTOPP_BLOCK_6(pad, byte, IVSize())
CRYPTOPP_BLOCKS_END(6)