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watch_queue: Annotate struct watch_filter with __counted_by
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 watch_filter. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: David Howells <dhowells@redhat.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Siddh Raman Pant <code@siddh.me> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Qian Cai <cai@redhat.com> Signed-off-by: Kees Cook <keescook@chromium.org> Tested-by: Siddh Raman Pant <code@siddh.me> Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org> Message-Id: <20230922175407.work.754-kees@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
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@ -32,7 +32,7 @@ struct watch_filter {
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DECLARE_BITMAP(type_filter, WATCH_TYPE__NR);
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};
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u32 nr_filters; /* Number of filters */
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struct watch_type_filter filters[];
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struct watch_type_filter filters[] __counted_by(nr_filters);
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};
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struct watch_queue {
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