From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- arch/um/kernel/maccess.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 arch/um/kernel/maccess.c (limited to 'arch/um/kernel/maccess.c') diff --git a/arch/um/kernel/maccess.c b/arch/um/kernel/maccess.c new file mode 100644 index 000000000..8ccd56813 --- /dev/null +++ b/arch/um/kernel/maccess.c @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2013 Richard Weinberger + */ + +#include +#include +#include + +bool copy_from_kernel_nofault_allowed(const void *src, size_t size) +{ + void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE); + + if ((unsigned long)src < PAGE_SIZE || size <= 0) + return false; + if (os_mincore(psrc, size + src - psrc) <= 0) + return false; + return true; +} -- cgit v1.2.3