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Message-Id: <20230922175046.work.766-kees@kernel.org>
Date: Fri, 22 Sep 2023 10:50:47 -0700
From: Kees Cook <keescook@...omium.org>
To: Jaroslav Kysela <perex@...ex.cz>
Cc: Kees Cook <keescook@...omium.org>, Takashi Iwai <tiwai@...e.com>,
alsa-devel@...a-project.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] ALSA: usx2y: Annotate struct snd_usx2y_urb_seq 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 snd_usx2y_urb_seq.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Jaroslav Kysela <perex@...ex.cz>
Cc: Takashi Iwai <tiwai@...e.com>
Cc: alsa-devel@...a-project.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
sound/usb/usx2y/usbusx2y.h | 2 +-
sound/usb/usx2y/usbusx2yaudio.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/usb/usx2y/usbusx2y.h b/sound/usb/usx2y/usbusx2y.h
index 8d82f5cc2fe1..391fd7b4ed5e 100644
--- a/sound/usb/usx2y/usbusx2y.h
+++ b/sound/usb/usx2y/usbusx2y.h
@@ -18,7 +18,7 @@ struct snd_usx2y_async_seq {
struct snd_usx2y_urb_seq {
int submitted;
int len;
- struct urb *urb[];
+ struct urb *urb[] __counted_by(len);
};
#include "usx2yhwdeppcm.h"
diff --git a/sound/usb/usx2y/usbusx2yaudio.c b/sound/usb/usx2y/usbusx2yaudio.c
index 5197599e7aa6..ca7888495a9f 100644
--- a/sound/usb/usx2y/usbusx2yaudio.c
+++ b/sound/usb/usx2y/usbusx2yaudio.c
@@ -681,6 +681,7 @@ static int usx2y_rate_set(struct usx2ydev *usx2y, int rate)
err = -ENOMEM;
goto cleanup;
}
+ us->len = NOOF_SETRATE_URBS;
usbdata = kmalloc_array(NOOF_SETRATE_URBS, sizeof(int),
GFP_KERNEL);
if (!usbdata) {
@@ -702,7 +703,6 @@ static int usx2y_rate_set(struct usx2ydev *usx2y, int rate)
if (err < 0)
goto cleanup;
us->submitted = 0;
- us->len = NOOF_SETRATE_URBS;
usx2y->us04 = us;
wait_event_timeout(usx2y->in04_wait_queue, !us->len, HZ);
usx2y->us04 = NULL;
--
2.34.1
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