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Message-Id: <20230922175242.work.442-kees@kernel.org>
Date: Fri, 22 Sep 2023 10:52:42 -0700
From: Kees Cook <keescook@...omium.org>
To: Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>
Cc: Kees Cook <keescook@...omium.org>,
Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>,
linux-serial@...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] serial: 8250_pci1xxxx: Annotate struct pci1xxxx_8250 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 pci1xxxx_8250.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>
Cc: Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jirislaby@...nel.org>
Cc: linux-serial@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/tty/serial/8250/8250_pci1xxxx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/8250/8250_pci1xxxx.c b/drivers/tty/serial/8250/8250_pci1xxxx.c
index a3b25779d921..0da9847f3e91 100644
--- a/drivers/tty/serial/8250/8250_pci1xxxx.c
+++ b/drivers/tty/serial/8250/8250_pci1xxxx.c
@@ -107,7 +107,7 @@ static const int logical_to_physical_port_idx[][MAX_PORTS] = {
struct pci1xxxx_8250 {
unsigned int nr;
void __iomem *membase;
- int line[];
+ int line[] __counted_by(nr);
};
static int pci1xxxx_get_num_ports(struct pci_dev *dev)
--
2.34.1
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