linux-kernel - [PATCH 2/3] RISC-V: use memcpy for kexec

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Message-ID: <20211030031832.165457-3-liaochang1@huawei.com>
Date:   Sat, 30 Oct 2021 11:18:31 +0800
From:   Liao Chang <liaochang1@...wei.com>
To:     <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>, <ebiederm@...ssion.com>,
        <mick@....forth.gr>, <jszhang@...nel.org>,
        <guoren@...ux.alibaba.com>, <penberg@...nel.org>,
        <sunnanyong@...wei.com>, <wangkefeng.wang@...wei.com>,
        <changbin.du@...el.com>, <alex@...ti.fr>
CC:     <liaochang1@...wei.com>, <linux-riscv@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kexec@...ts.infradead.org>
Subject: [PATCH 2/3] RISC-V: use memcpy for kexec_file mode

The pointer to buffer loading kernel binaries is in kernel space for
kexec_fil mode, When copy_from_user copies data from pointer to a block
of memory, it checkes that the pointer is in the user space range, on
RISCV-V that is:

static inline bool __access_ok(unsigned long addr, unsigned long size)
{
	return size <= TASK_SIZE && addr <= TASK_SIZE - size;
}

and TASK_SIZE is 0x4000000000 for 64-bits, which now causes
copy_from_user to reject the access of the field 'buf' of struct
kexec_segment that is in range [CONFIG_PAGE_OFFSET - VMALLOC_SIZE,
CONFIG_PAGE_OFFSET), is invalid user space pointer.

This patch fixes this issue by skipping access_ok(), use mempcy() instead.

Signed-off-by: Liao Chang <liaochang1@...wei.com>
---
 arch/riscv/kernel/machine_kexec.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c
index e6eca271a4d6..4a5db856919b 100644
--- a/arch/riscv/kernel/machine_kexec.c
+++ b/arch/riscv/kernel/machine_kexec.c
@@ -65,7 +65,9 @@ machine_kexec_prepare(struct kimage *image)
 		if (image->segment[i].memsz <= sizeof(fdt))
 			continue;
 
-		if (copy_from_user(&fdt, image->segment[i].buf, sizeof(fdt)))
+		if (image->file_mode)
+			memcpy(&fdt, image->segment[i].buf, sizeof(fdt));
+		else if (copy_from_user(&fdt, image->segment[i].buf, sizeof(fdt)))
 			continue;
 
 		if (fdt_check_header(&fdt))
-- 
2.17.1