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| author | YingChi Long <me@inclyc.cn> | 2022-11-18 01:55:35 +0100 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-11-22 17:13:03 +0100 |
| commit | 55228db2697c09abddcb9487c3d9fa5854a932cd (patch) | |
| tree | f2ecca183f3ea77f6863389458636c9068841be0 /LICENSES | |
| parent | selftests/vm/pkeys: Add a regression test for setting PKRU through ptrace (diff) | |
| download | linux-55228db2697c09abddcb9487c3d9fa5854a932cd.tar.xz linux-55228db2697c09abddcb9487c3d9fa5854a932cd.zip | |
x86/fpu: Use _Alignof to avoid undefined behavior in TYPE_ALIGN
WG14 N2350 specifies that it is an undefined behavior to have type
definitions within offsetof", see
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2350.htm
This specification is also part of C23.
Therefore, replace the TYPE_ALIGN macro with the _Alignof builtin to
avoid undefined behavior. (_Alignof itself is C11 and the kernel is
built with -gnu11).
ISO C11 _Alignof is subtly different from the GNU C extension
__alignof__. Latter is the preferred alignment and _Alignof the
minimal alignment. For long long on x86 these are 8 and 4
respectively.
The macro TYPE_ALIGN's behavior matches _Alignof rather than
__alignof__.
[ bp: Massage commit message. ]
Signed-off-by: YingChi Long <me@inclyc.cn>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20220925153151.2467884-1-me@inclyc.cn
Diffstat (limited to 'LICENSES')
0 files changed, 0 insertions, 0 deletions