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Message-ID: <a6c48181-47af-49db-860e-14812a1c186f@amd.com> Date: Mon, 2 Oct 2023 12:17:06 +0200 From: Michal Simek <michal.simek@....com> To: Kees Cook <keescook@...omium.org>, Jassi Brar <jassisinghbrar@...il.com> CC: <linux-arm-kernel@...ts.infradead.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: Re: [PATCH] mailbox: zynqmp: Annotate struct zynqmp_ipi_pdata with __counted_by On 9/22/23 19:53, Kees Cook wrote: > 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 zynqmp_ipi_pdata. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Jassi Brar <jassisinghbrar@...il.com> > Cc: Michal Simek <michal.simek@....com> > Cc: linux-arm-kernel@...ts.infradead.org > Signed-off-by: Kees Cook <keescook@...omium.org> > --- > drivers/mailbox/zynqmp-ipi-mailbox.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c > index e4fcac97dbfa..7fa533e80dd9 100644 > --- a/drivers/mailbox/zynqmp-ipi-mailbox.c > +++ b/drivers/mailbox/zynqmp-ipi-mailbox.c > @@ -108,7 +108,7 @@ struct zynqmp_ipi_pdata { > unsigned int method; > u32 local_id; > int num_mboxes; > - struct zynqmp_ipi_mbox ipi_mboxes[]; > + struct zynqmp_ipi_mbox ipi_mboxes[] __counted_by(num_mboxes); > }; > > static struct device_driver zynqmp_ipi_mbox_driver = { Acked-by: Michal Simek <michal.simek@....com> Thanks, Michal
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