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linux/include/uapi
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Alexander Lobakin a39ff5bf23 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 10:34:16 +01:00
..
asm-generic net: add SO_DEVMEM_DONTNEED setsockopt to release RX frags 2024-09-11 20:44:32 -07:00
drm drm/xe/ptl: L3bank mask is not available on the media GT 2024-12-14 20:03:44 +01:00
linux stddef: make __struct_group() UAPI C++-friendly 2025-01-02 10:34:16 +01:00
misc Revert "misc: fastrpc: Restrict untrusted app to attach to privileged PD" 2024-08-15 16:59:14 +02:00
mtd ubi: fastmap: Add control in 'UBI_IOCATT' ioctl to reserve PEBs for filling pools 2023-10-28 23:16:00 +02:00
rdma RDMA/nldev: Expose whether RDMA monitoring is supported 2024-09-13 08:29:34 +03:00
regulator uapi: regulator: Fix typo 2024-01-04 13:22:24 +00:00
scsi scsi: mpi3mr: Add ioctl support for HDB 2024-06-26 23:30:09 -04:00
sound ASoC: topology: Bump minimal topology ABI version 2024-10-10 12:15:03 +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/privcmd: Add new syscall to get gsi from dev 2024-09-25 09:54:55 +02:00
Kbuild kbuild: re-implement Makefile.headersinst without recursion 2019-06-15 19:57:02 +09:00