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platform/surface: Split memcpy() of struct ssam_event flexible array

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To work around a misbehavior of the compiler's ability to see into
composite flexible array structs (as detailed in the coming memcpy()
hardening series[1]), split the memcpy() of the header and the payload
so no false positive run-time overflow warning will be generated.

[1] https://lore.kernel.org/linux-hardening/20220901065914.1417829-2-keescook@chromium.org

Cc: Maximilian Luz <luzmaximilian@gmail.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Mark Gross <markgross@kernel.org>
Cc: platform-driver-x86@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/20220927004011.1942739-1-keescook@chromium.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Kees Cook 2022-09-26 17:40:11 -07:00 committed by Hans de Goede
parent d443fcad6f
commit a776bf77c9
1 changed files with 2 additions and 1 deletions
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3
drivers/platform/surface/surface_acpi_notify.c
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@ -355,7 +355,8 @@ static u32 san_evt_bat_nf(struct ssam_event_notifier *nf,
INIT_DELAYED_WORK(&work->work, san_evt_bat_workfn);
work->dev = d->dev;
memcpy(&work->event, event, sizeof(struct ssam_event) + event->length);
work->event = *event;
memcpy(work->event.data, event->data, event->length);
queue_delayed_work(san_wq, &work->work, delay);
return SSAM_NOTIF_HANDLED;