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irqdomain: Annotate struct irq_domain 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 irq_domain.

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

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230922175127.work.214-kees@kernel.org
This commit is contained in:
Kees Cook 2023-09-22 10:51:27 -07:00 committed by Thomas Gleixner
parent 0bb80ecc33
commit 6260ecd045
1 changed files with 1 additions and 1 deletions
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include/linux/irqdomain.h
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@ -174,7 +174,7 @@ struct irq_domain {
irq_hw_number_t hwirq_max;
unsigned int revmap_size;
struct radix_tree_root revmap_tree;
struct irq_data __rcu *revmap[];
struct irq_data __rcu *revmap[] __counted_by(revmap_size);
};
/* Irq domain flags */