From: Kees Cook <keescook@chromium.org>
To: Lee Jones <lee@kernel.org>
Cc: Kees Cook <keescook@chromium.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] mfd: iqs62x: Annotate struct iqs62x_fw_blk with __counted_by
Date: Fri, 22 Sep 2023 10:53:38 -0700 [thread overview]
Message-ID: <20230922175337.work.150-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 iqs62x_fw_blk.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Lee Jones <lee@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/mfd/iqs62x.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mfd/iqs62x.c b/drivers/mfd/iqs62x.c
index e03b4d38fbb0..1b465590567c 100644
--- a/drivers/mfd/iqs62x.c
+++ b/drivers/mfd/iqs62x.c
@@ -96,7 +96,7 @@ struct iqs62x_fw_blk {
u8 addr;
u8 mask;
u8 len;
- u8 data[];
+ u8 data[] __counted_by(len);
};
struct iqs62x_info {
--
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 17:53 Kees Cook [this message]
2023-09-23 16:37 ` [PATCH] mfd: iqs62x: Annotate struct iqs62x_fw_blk with __counted_by Gustavo A. R. Silva
2023-09-28 13:19 ` (subset) " Lee Jones
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