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Merge pull request #3199 from mpg/fix-overflow-benchmark-2.7

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[backport 2.7] Fix arithmetic overflow in benchmark
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Gilles Peskine 2020-04-20 12:02:58 +02:00 committed by GitHub
parent bc8c513ecb 49e7a951da
commit 016e4ac11b
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 12 additions and 1 deletions
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13
programs/test/benchmark.c
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@ -133,6 +133,16 @@ do { \
#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C) && defined(MBEDTLS_MEMORY_DEBUG)
/* How much space to reserve for the title when printing heap usage results.
* Updated manually as the output of the following command:
*
* sed -n 's/.*[T]IME_PUBLIC.*"\(.*\)",/\1/p' programs/test/benchmark.c |
* awk '{print length+2}' | sort -rn | head -n1
*
* This computes the maximum length of a title +2 (because we appends "/s").
* (If the value is too small, the only consequence is poor alignement.) */
#define TITLE_SPACE 11
#define MEMORY_MEASURE_INIT \
size_t max_used, max_blocks, max_bytes; \
size_t prv_used, prv_blocks; \
@ -141,7 +151,8 @@ do { \
#define MEMORY_MEASURE_PRINT( title_len ) \
mbedtls_memory_buffer_alloc_max_get( &max_used, &max_blocks ); \
for( ii = 12 - title_len; ii != 0; ii-- ) mbedtls_printf( " " ); \
ii = TITLE_SPACE > (title_len) ? TITLE_SPACE - (title_len) : 1; \
while( ii-- ) mbedtls_printf( " " ); \
max_used -= prv_used; \
max_blocks -= prv_blocks; \
max_bytes = max_used + MEM_BLOCK_OVERHEAD * max_blocks; \