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CVE-2022-48566 Cherry-pick 8bef9ebb1b88cfa4b2a38b93fe4ea22015d8254a #44

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Apr 17, 2024
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CVE-2022-48566 Cherry-pick 8bef9ebb1b88cfa4b2a38b93fe4ea22015d8254a #44

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Security/2020-05-28-06-06-47.bpo-40791.QGZClX.rst
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@@ -0,0 +1 @@
Add ``volatile`` to the accumulator variable in ``hmac.compare_digest``, making constant-time-defeating optimizations less likely.
2 changes: 1 addition & 1 deletion Modules/operator.c
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Expand Up @@ -259,7 +259,7 @@ _tscmp(const unsigned char *a, const unsigned char *b,
volatile const unsigned char *left;
volatile const unsigned char *right;
Py_ssize_t i;
unsigned char result;
volatile unsigned char result;

/* loop count depends on length of b */
length = len_b;
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