v0.8.1
https://github.com/python/cpython
* bpo-40791: Make compare_digest more constant-time. The existing volatile `left`/`right` pointers guarantee that the reads will all occur, but does not guarantee that they will be _used_. So a compiler can still short-circuit the loop, saving e.g. the overhead of doing the xors and especially the overhead of the data dependency between `result` and the reads. That would change performance depending on where the first unequal byte occurs. This change removes that optimization. (This is change #1 from https://bugs.python.org/issue40791 .)
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bpo-40791: Make compare_digest more constant-time. (GH-20444)
File | Mode | Size |
---|---|---|
darwin | ||
libffi_osx | ||
_ctypes.c | -rw-r--r-- | 185.1 KB |
_ctypes_test.c | -rw-r--r-- | 21.6 KB |
_ctypes_test.h | -rw-r--r-- | 82 bytes |
callbacks.c | -rw-r--r-- | 18.1 KB |
callproc.c | -rw-r--r-- | 58.5 KB |
cfield.c | -rw-r--r-- | 42.2 KB |
ctypes.h | -rw-r--r-- | 13.1 KB |
ctypes_dlfcn.h | -rw-r--r-- | 459 bytes |
malloc_closure.c | -rw-r--r-- | 3.2 KB |
stgdict.c | -rw-r--r-- | 31.3 KB |
Computing file changes ...