From: Kees Cook <keescook@chromium.org>
To: "David S. Miller" <davem@davemloft.net>
Cc: Kees Cook <keescook@chromium.org>,
sparclinux@vger.kernel.org, Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Tom Rix <trix@redhat.com>,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
linux-hardening@vger.kernel.org
Subject: [PATCH] sparc: Annotate struct cpuinfo_tree with __counted_by
Date: Fri, 22 Sep 2023 10:52:00 -0700 [thread overview]
Message-ID: <20230922175159.work.357-kees@kernel.org> (raw)
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 cpuinfo_tree.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
arch/sparc/kernel/cpumap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/sparc/kernel/cpumap.c b/arch/sparc/kernel/cpumap.c
index f07ea88a83af..8fcf2d8c6bd2 100644
--- a/arch/sparc/kernel/cpumap.c
+++ b/arch/sparc/kernel/cpumap.c
@@ -50,7 +50,7 @@ struct cpuinfo_tree {
/* Offsets into nodes[] for each level of the tree */
struct cpuinfo_level level[CPUINFO_LVL_MAX];
- struct cpuinfo_node nodes[];
+ struct cpuinfo_node nodes[] __counted_by(total_nodes);
};
--
2.34.1
next reply other threads:[~2023-09-22 17:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-22 17:52 Kees Cook [this message]
2023-09-23 16:34 ` [PATCH] sparc: Annotate struct cpuinfo_tree with __counted_by Gustavo A. R. Silva
2023-10-06 20:25 ` Kees Cook
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