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Diffstat (limited to 'doc/news.rst')
| -rw-r--r-- | doc/news.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/doc/news.rst b/doc/news.rst index 9ddca58bd..8a52f288d 100644 --- a/doc/news.rst +++ b/doc/news.rst @@ -38,6 +38,15 @@ Version 1.11.26, Not Yet Released infinite loop or the discarding of an incorrect number of bytes. Reported on mailing list by Falko Strenzke. +* Previously if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK was defined, + the code doing low level loads/stores would use pointer casts to + access larger words out of a (potentially misaligned) byte array, + rather than using byte-at-a-time accesses. However even on platforms + such as x86 where this works, it triggers UBSan errors under Clang. + Instead use memcpy, which the C standard says is usable for such + purposes even with misaligned values. With recent GCC and Clang, the + same code seems to be emitted for either approach. + * Avoid calling memcpy, memset, or memmove with a length of zero to avoid undefined behavior, as calling these functions with an invalid or null pointer, even with a length of zero, is invalid. Often there |