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mdbx-backport: avoid 4-byte aligned (i.e. unaligned) access to 64-bit integers.

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Historically, the page header provides 4-byte data alignment.
Therefore, unfortunately, the meta page data is also aligned on a 4-byte boundary, but contains 64-bit values.

This commit eliminates potentially unsafe access (SPARC, MIPS, etc) to these 64-bit values aligned on a 4-byte boundary.
Thus, a build with the `-fsanitize=undefined` now passes the tests both with CLANG 11 and GCC 10.

Change-Id: Ie441103e53ed96fd40507d8c0be0689e3fee69f5
This commit is contained in:
Leonid Yuriev
2020-12-01 20:23:23 +03:00
parent adc7208169
commit e766df658c
3 changed files with 106 additions and 76 deletions
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ChangeLog.md
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@@ -23,6 +23,7 @@ Fixes:
- Fixed missing cleanup (null assigned) in the C++ commit/abort (https://github.com/erthink/libmdbx/pull/143).
- Fixed `mdbx_realloc()` for case of nullptr and `MDBX_AVOID_CRT=ON` for Windows.
- Fixed the possibility to use invalid and renewed (closed & re-opened, dropped & re-created) DBI-handles (https://github.com/erthink/libmdbx/issues/146).
- Fixed 4-byte aligned access to 64-bit integers.
## v0.9.2 scheduled at 2020-11-27