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Alexander Lobakin 7357ad7d1f stddef: make __struct_group() UAPI C++-friendly 
[ Upstream commit 724c6ce38b ]

For the most part of the C++ history, it couldn't have type
declarations inside anonymous unions for different reasons. At the
same time, __struct_group() relies on the latters, so when the @TAG
argument is not empty, C++ code doesn't want to build (even under
`extern "C"`):

../linux/include/uapi/linux/pkt_cls.h:25:24: error:
'struct tc_u32_sel::<unnamed union>::tc_u32_sel_hdr,' invalid;
an anonymous union may only have public non-static data members
[-fpermissive]

The safest way to fix this without trying to switch standards (which
is impossible in UAPI anyway) etc., is to disable tag declaration
for that language. This won't break anything since for now it's not
buildable at all.
Use a separate definition for __struct_group() when __cplusplus is
defined to mitigate the error, including the version from tools/.

Fixes: 50d7bd38c3 ("stddef: Introduce struct_group() helper macro")
Reported-by: Christopher Ferris <cferris@google.com>
Closes: https://lore.kernel.org/linux-hardening/Z1HZpe3WE5As8UAz@google.com
Suggested-by: Kees Cook <kees@kernel.org> # __struct_group_tag()
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20241219135734.2130002-1-aleksander.lobakin@intel.com
Signed-off-by: Kees Cook <kees@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-01-02 10:30:51 +01:00
..
asm nds32: Remove the architecture 2022-03-07 13:54:59 +01:00
asm-generic hugetlb_encode.h: fix undefined behaviour (34 << 26) 2022-10-03 14:02:55 -07:00
linux tools: move alignment-related macros to new <linux/align.h> 2024-08-29 17:30:57 +02:00
nolibc tools/nolibc/stdlib: fix memory error in realloc() 2024-06-12 11:02:56 +02:00
tools tools include: add dis-asm-compat.h to handle version differences 2022-08-01 15:29:49 -03:00
trace/events tools/lib/lockdep: Remove private kernel headers 2017-06-05 09:28:14 +02:00
uapi stddef: make __struct_group() UAPI C++-friendly 2025-01-02 10:30:51 +01:00
vdso tools headers: Synchronize linux/bits.h with the kernel sources 2020-04-14 11:40:05 -03:00