lib/mbedtls
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Fix gcc -O3 warnings

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman
2024-03-12 16:34:43 +00:00
parent e0ffb1d2e9
commit 4faa34dc86
2 changed files with 14 additions and 0 deletions
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5
library/cmac.c
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@ -224,6 +224,10 @@ int mbedtls_cipher_cmac_update(mbedtls_cipher_context_t *ctx,
block_size = mbedtls_cipher_info_get_block_size(ctx->cipher_info); block_size = mbedtls_cipher_info_get_block_size(ctx->cipher_info);
state = ctx->cmac_ctx->state; state = ctx->cmac_ctx->state;
/* Without the MBEDTLS_ASSUME below, gcc -O3 will generate a warning of the form
* error: writing 16 bytes into a region of size 0 [-Werror=stringop-overflow=] */
MBEDTLS_ASSUME(block_size <= MBEDTLS_CMAC_MAX_BLOCK_SIZE);
/* Is there data still to process from the last call, that's greater in /* Is there data still to process from the last call, that's greater in
* size than a block? */ * size than a block? */
if (cmac_ctx->unprocessed_len > 0 && if (cmac_ctx->unprocessed_len > 0 &&
@ -291,6 +295,7 @@ int mbedtls_cipher_cmac_finish(mbedtls_cipher_context_t *ctx,
cmac_ctx = ctx->cmac_ctx; cmac_ctx = ctx->cmac_ctx;
block_size = mbedtls_cipher_info_get_block_size(ctx->cipher_info); block_size = mbedtls_cipher_info_get_block_size(ctx->cipher_info);
MBEDTLS_ASSUME(block_size <= MBEDTLS_CMAC_MAX_BLOCK_SIZE); // silence GCC warning
state = cmac_ctx->state; state = cmac_ctx->state;
mbedtls_platform_zeroize(K1, sizeof(K1)); mbedtls_platform_zeroize(K1, sizeof(K1));

9
library/gcm.c
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@ -412,8 +412,17 @@ int mbedtls_gcm_starts(mbedtls_gcm_context *ctx,
while (iv_len > 0) { while (iv_len > 0) {
use_len = (iv_len < 16) ? iv_len : 16; use_len = (iv_len < 16) ? iv_len : 16;
#if defined(MBEDTLS_COMPILER_IS_GCC)
#pragma GCC diagnostic push
#pragma GCC diagnostic warning "-Wstringop-overflow=0"
#endif
mbedtls_xor(ctx->y, ctx->y, p, use_len); mbedtls_xor(ctx->y, ctx->y, p, use_len);
#if defined(MBEDTLS_COMPILER_IS_GCC)
#pragma GCC diagnostic pop
#endif
gcm_mult(ctx, ctx->y, ctx->y); gcm_mult(ctx, ctx->y, ctx->y);
iv_len -= use_len; iv_len -= use_len;