From 1c674013547d0b9131dce0acdda74c2a5b95510e Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Fri, 15 Sep 2023 13:14:39 -0700 Subject: NFS/flexfiles: Annotate struct nfs4_ff_layout_segment 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 nfs4_ff_layout_segment. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Trond Myklebust Cc: Anna Schumaker Cc: linux-nfs@vger.kernel.org Reviewed-by: "Gustavo A. R. Silva" Link: https://lore.kernel.org/r/20230915201434.never.346-kees@kernel.org Signed-off-by: Kees Cook --- fs/nfs/flexfilelayout/flexfilelayout.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/nfs/flexfilelayout/flexfilelayout.h b/fs/nfs/flexfilelayout/flexfilelayout.h index 354a031c69b1..f84b3fb0dddd 100644 --- a/fs/nfs/flexfilelayout/flexfilelayout.h +++ b/fs/nfs/flexfilelayout/flexfilelayout.h @@ -99,7 +99,7 @@ struct nfs4_ff_layout_segment { u64 stripe_unit; u32 flags; u32 mirror_array_cnt; - struct nfs4_ff_layout_mirror *mirror_array[]; + struct nfs4_ff_layout_mirror *mirror_array[] __counted_by(mirror_array_cnt); }; struct nfs4_flexfile_layout { -- cgit v1.2.3