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Alexander Lobakin 23681bc4b5 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 10:32:03 +01:00
..
asm-generic syscalls: fix compat_sys_io_pgetevents_time64 usage 2024-07-05 09:34:04 +02:00
drm drm/amdgpu: handle gfx12 in amdgpu_display_verify_sizes 2024-09-12 11:11:43 +02:00
linux stddef: make __struct_group() UAPI C++-friendly 2025-01-02 10:32:03 +01:00
misc Revert "misc: fastrpc: Restrict untrusted app to attach to privileged PD" 2024-08-29 17:33:10 +02:00
mtd This pull request contains updates for UBI and UBIFS 2022-10-14 18:23:23 -07:00
rdma RDMA/bnxt_re: Adds MSN table capability for Gen P7 adapters 2024-06-12 11:12:10 +02:00
scsi scsi: mpi3mr: Avoid memcpy field-spanning write WARNING 2024-05-17 12:02:11 +02:00
sound ASoC: SOF: topology: Add a token for dropping widget name in kcontrol name 2023-08-15 13:25:56 +01:00
video License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
xen xen: irqfd: Use _IOW instead of the internal _IOC() macro 2023-11-20 11:59:12 +01:00
Kbuild kbuild: re-implement Makefile.headersinst without recursion 2019-06-15 19:57:02 +09:00