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platform/surface: aggregator: Annotate struct ssam_event with __counted_by

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Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct ssam_event.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Maximilian Luz <luzmaximilian@gmail.com>
Cc: platform-driver-x86@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/20230922175436.work.031-kees@kernel.org
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Kees Cook 2023-09-22 10:54:37 -07:00 committed by Ilpo Järvinen
parent 55ec81f751
commit 9cf63f3a33
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1 changed files with 1 additions and 1 deletions
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2
include/linux/surface_aggregator/controller.h
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@ -44,7 +44,7 @@ struct ssam_event {
u8 command_id;
u8 instance_id;
u16 length;
u8 data[];
u8 data[] __counted_by(length);
};
/**