linux-kernel - [PATCH] nfs41: Annotate struct nfs4_file_layout_dsaddr with __counted

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Date:   Fri, 15 Sep 2023 13:14:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Trond Myklebust <trond.myklebust@...merspace.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Anna Schumaker <anna@...nel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-nfs@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: [PATCH] nfs41: Annotate struct nfs4_file_layout_dsaddr 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_file_layout_dsaddr.

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

Cc: Trond Myklebust <trond.myklebust@...merspace.com>
Cc: Anna Schumaker <anna@...nel.org>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-nfs@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 fs/nfs/filelayout/filelayout.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/filelayout/filelayout.h b/fs/nfs/filelayout/filelayout.h
index aed0748fd6ec..c7bb5da93307 100644
--- a/fs/nfs/filelayout/filelayout.h
+++ b/fs/nfs/filelayout/filelayout.h
@@ -51,7 +51,7 @@ struct nfs4_file_layout_dsaddr {
 	u32				stripe_count;
 	u8				*stripe_indices;
 	u32				ds_num;
-	struct nfs4_pnfs_ds		*ds_list[];
+	struct nfs4_pnfs_ds		*ds_list[] __counted_by(ds_num);
 };
 
 struct nfs4_filelayout_segment {
-- 
2.34.1