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-rw-r--r--crypto/Makefile5
-rw-r--r--crypto/memneq.c79
2 files changed, 54 insertions, 30 deletions
diff --git a/crypto/Makefile b/crypto/Makefile
index 989c510da8cc..b29402a7b9b5 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -2,11 +2,6 @@
# Cryptographic API
#
-# memneq MUST be built with -Os or -O0 to prevent early-return optimizations
-# that will defeat memneq's actual purpose to prevent timing attacks.
-CFLAGS_REMOVE_memneq.o := -O1 -O2 -O3
-CFLAGS_memneq.o := -Os
-
obj-$(CONFIG_CRYPTO) += crypto.o
crypto-y := api.o cipher.o compress.o memneq.o
diff --git a/crypto/memneq.c b/crypto/memneq.c
index cd0162221c14..570f6f3401ce 100644
--- a/crypto/memneq.c
+++ b/crypto/memneq.c
@@ -72,6 +72,7 @@ __crypto_memneq_generic(const void *a, const void *b, size_t size)
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
while (size >= sizeof(unsigned long)) {
neq |= *(unsigned long *)a ^ *(unsigned long *)b;
+ OPTIMIZER_HIDE_VAR(neq);
a += sizeof(unsigned long);
b += sizeof(unsigned long);
size -= sizeof(unsigned long);
@@ -79,6 +80,7 @@ __crypto_memneq_generic(const void *a, const void *b, size_t size)
#endif /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */
while (size > 0) {
neq |= *(unsigned char *)a ^ *(unsigned char *)b;
+ OPTIMIZER_HIDE_VAR(neq);
a += 1;
b += 1;
size -= 1;
@@ -89,33 +91,60 @@ __crypto_memneq_generic(const void *a, const void *b, size_t size)
/* Loop-free fast-path for frequently used 16-byte size */
static inline unsigned long __crypto_memneq_16(const void *a, const void *b)
{
+ unsigned long neq = 0;
+
#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
- if (sizeof(unsigned long) == 8)
- return ((*(unsigned long *)(a) ^ *(unsigned long *)(b))
- | (*(unsigned long *)(a+8) ^ *(unsigned long *)(b+8)));
- else if (sizeof(unsigned int) == 4)
- return ((*(unsigned int *)(a) ^ *(unsigned int *)(b))
- | (*(unsigned int *)(a+4) ^ *(unsigned int *)(b+4))
- | (*(unsigned int *)(a+8) ^ *(unsigned int *)(b+8))
- | (*(unsigned int *)(a+12) ^ *(unsigned int *)(b+12)));
- else
+ if (sizeof(unsigned long) == 8) {
+ neq |= *(unsigned long *)(a) ^ *(unsigned long *)(b);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned long *)(a+8) ^ *(unsigned long *)(b+8);
+ OPTIMIZER_HIDE_VAR(neq);
+ } else if (sizeof(unsigned int) == 4) {
+ neq |= *(unsigned int *)(a) ^ *(unsigned int *)(b);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned int *)(a+4) ^ *(unsigned int *)(b+4);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned int *)(a+8) ^ *(unsigned int *)(b+8);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned int *)(a+12) ^ *(unsigned int *)(b+12);
+ OPTIMIZER_HIDE_VAR(neq);
+ } else {
#endif /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */
- return ((*(unsigned char *)(a) ^ *(unsigned char *)(b))
- | (*(unsigned char *)(a+1) ^ *(unsigned char *)(b+1))
- | (*(unsigned char *)(a+2) ^ *(unsigned char *)(b+2))
- | (*(unsigned char *)(a+3) ^ *(unsigned char *)(b+3))
- | (*(unsigned char *)(a+4) ^ *(unsigned char *)(b+4))
- | (*(unsigned char *)(a+5) ^ *(unsigned char *)(b+5))
- | (*(unsigned char *)(a+6) ^ *(unsigned char *)(b+6))
- | (*(unsigned char *)(a+7) ^ *(unsigned char *)(b+7))
- | (*(unsigned char *)(a+8) ^ *(unsigned char *)(b+8))
- | (*(unsigned char *)(a+9) ^ *(unsigned char *)(b+9))
- | (*(unsigned char *)(a+10) ^ *(unsigned char *)(b+10))
- | (*(unsigned char *)(a+11) ^ *(unsigned char *)(b+11))
- | (*(unsigned char *)(a+12) ^ *(unsigned char *)(b+12))
- | (*(unsigned char *)(a+13) ^ *(unsigned char *)(b+13))
- | (*(unsigned char *)(a+14) ^ *(unsigned char *)(b+14))
- | (*(unsigned char *)(a+15) ^ *(unsigned char *)(b+15)));
+ neq |= *(unsigned char *)(a) ^ *(unsigned char *)(b);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+1) ^ *(unsigned char *)(b+1);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+2) ^ *(unsigned char *)(b+2);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+3) ^ *(unsigned char *)(b+3);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+4) ^ *(unsigned char *)(b+4);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+5) ^ *(unsigned char *)(b+5);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+6) ^ *(unsigned char *)(b+6);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+7) ^ *(unsigned char *)(b+7);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+8) ^ *(unsigned char *)(b+8);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+9) ^ *(unsigned char *)(b+9);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+10) ^ *(unsigned char *)(b+10);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+11) ^ *(unsigned char *)(b+11);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+12) ^ *(unsigned char *)(b+12);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+13) ^ *(unsigned char *)(b+13);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+14) ^ *(unsigned char *)(b+14);
+ OPTIMIZER_HIDE_VAR(neq);
+ neq |= *(unsigned char *)(a+15) ^ *(unsigned char *)(b+15);
+ OPTIMIZER_HIDE_VAR(neq);
+ }
+
+ return neq;
}
/* Compare two areas of memory without leaking timing information,