From aade15333c3b4fe24403fd9a52e15fb61993face Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Fri, 15 Sep 2023 13:14:56 -0700 Subject: [PATCH] afs: Annotate struct afs_permits 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 afs_permits. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: David Howells Cc: Marc Dionne Cc: linux-afs@lists.infradead.org Reviewed-by: "Gustavo A. R. Silva" Link: https://lore.kernel.org/r/20230915201456.never.529-kees@kernel.org Signed-off-by: Kees Cook --- fs/afs/internal.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/afs/internal.h b/fs/afs/internal.h index da73b97e19a9..813efd3784aa 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -705,7 +705,7 @@ struct afs_permits { refcount_t usage; unsigned short nr_permits; /* Number of records */ bool invalidated; /* Invalidated due to key change */ - struct afs_permit permits[]; /* List of permits sorted by key pointer */ + struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */ }; /*