linux-kernel - [PATCH RESEND] riscv: mmap(): use unsigned offset type in riscv_sys

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Message-ID: <20250801104948133AaMr5S6E382PbNNhoJgHA@zte.com.cn>
Date: Fri, 1 Aug 2025 10:49:48 +0800 (CST)
From: <liu.xuemei1@....com.cn>
To: <paul.walmsley@...ive.com>
Cc: <palmer@...belt.com>, <aou@...s.berkeley.edu>, <alex@...ti.fr>,
        <liu.xuemei1@....com.cn>, <linux-riscv@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH RESEND] riscv: mmap(): use unsigned offset type in riscv_sys_mmap

From: Jessica Liu <liu.xuemei1@....com.cn>

The variable type of offset should be consistent with the relevant
interfaces of mmap which described in commit 295f10061af0 ("syscalls:
mmap(): use unsigned offset type consistently). Otherwise, a user input
with the top bit set would result in a negative page offset rather than a
large one.

Signed-off-by: Jessica Liu <liu.xuemei1@....com.cn>
---
arch/riscv/kernel/sys_riscv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/sys_riscv.c b/arch/riscv/kernel/sys_riscv.c
index d77afe05578f..795b2e815ac9 100644
--- a/arch/riscv/kernel/sys_riscv.c
+++ b/arch/riscv/kernel/sys_riscv.c
@@ -10,7 +10,7 @@

static long riscv_sys_mmap(unsigned long addr, unsigned long len,
 			unsigned long prot, unsigned long flags,
-			   unsigned long fd, off_t offset,
+			   unsigned long fd, unsigned long offset,
 			unsigned long page_shift_offset)
{
 	if (unlikely(offset & (~PAGE_MASK >> page_shift_offset)))
--
2.25.1