* [PATCH] iio: add __counted_by_ptr attribute to channels in struct iio_dev
@ 2026-09-23 4:28 Bill Wendling
2026-09-23 5:48 ` Gustavo A. R. Silva
0 siblings, 1 reply; 2+ messages in thread
From: Bill Wendling @ 2026-09-23 4:28 UTC (permalink / raw)
To: Jonathan Cameron
Cc: David Lechner, Nuno Sá,
Andy Shevchenko, Kees Cook, Gustavo A. R. Silva, linux-iio,
linux-kernel, linux-hardening, Bill Wendling,
codemender-patching+linux
In 'struct iio_dev', the 'channels' pointer refers to an array of IIO
channel specifications ('struct iio_chan_spec const'), and the size of
this array is tracked by the 'num_channels' field within the same
struct.
Applying the '__counted_by_ptr' attribute to 'channels' allows KASAN
and compiler-based bounds checkers to verify that accesses to 'channels'
remain within bounds at runtime.
Cc: codemender-patching+linux@google.com
Assisted-by: LLM
Signed-off-by: Bill Wendling <morbo@google.com>
---
include/linux/iio/iio.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 711c00f67371..20505139a61b 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -648,7 +648,7 @@ struct iio_dev {
struct iio_poll_func *pollfunc;
struct iio_poll_func *pollfunc_event;
- struct iio_chan_spec const *channels;
+ struct iio_chan_spec const *channels __counted_by_ptr(num_channels);
int num_channels;
const char *name;
--
2.55.0.1082.g2b9226bbc0-goog
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] iio: add __counted_by_ptr attribute to channels in struct iio_dev
2026-09-23 4:28 [PATCH] iio: add __counted_by_ptr attribute to channels in struct iio_dev Bill Wendling
@ 2026-09-23 5:48 ` Gustavo A. R. Silva
0 siblings, 0 replies; 2+ messages in thread
From: Gustavo A. R. Silva @ 2026-09-23 5:48 UTC (permalink / raw)
To: Bill Wendling, Jonathan Cameron
Cc: David Lechner, Nuno Sá,
Andy Shevchenko, Kees Cook, Gustavo A. R. Silva, linux-iio,
linux-kernel, linux-hardening, codemender-patching+linux
On 9/23/26 13:28, Bill Wendling wrote:
> In 'struct iio_dev', the 'channels' pointer refers to an array of IIO
> channel specifications ('struct iio_chan_spec const'), and the size of
> this array is tracked by the 'num_channels' field within the same
> struct.
>
> Applying the '__counted_by_ptr' attribute to 'channels' allows KASAN
> and compiler-based bounds checkers to verify that accesses to 'channels'
> remain within bounds at runtime.
>
> Cc: codemender-patching+linux@google.com
> Assisted-by: LLM
> Signed-off-by: Bill Wendling <morbo@google.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Thanks
-Gustavo
> ---
> include/linux/iio/iio.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
> index 711c00f67371..20505139a61b 100644
> --- a/include/linux/iio/iio.h
> +++ b/include/linux/iio/iio.h
> @@ -648,7 +648,7 @@ struct iio_dev {
> struct iio_poll_func *pollfunc;
> struct iio_poll_func *pollfunc_event;
>
> - struct iio_chan_spec const *channels;
> + struct iio_chan_spec const *channels __counted_by_ptr(num_channels);
> int num_channels;
>
> const char *name;
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-09-23 4:28 [PATCH] iio: add __counted_by_ptr attribute to channels in struct iio_dev Bill Wendling
2026-09-23 5:48 ` Gustavo A. R. Silva
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