linux-kernel - [PATCH] riscv; fix __user annotation in save_v

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Date:   Thu, 23 Nov 2023 14:27:08 +0000
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     linux-riscv@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu,
        Ben Dooks <ben.dooks@...ethink.co.uk>
Subject: [PATCH] riscv; fix __user annotation in save_v_state()

The save_v_state() is technically sending a __user pointer through
__put_user() and thus is generating a sparse warning so force the
value to be "void *" to fix:

arch/riscv/kernel/signal.c:94:16: warning: incorrect type in initializer (different address spaces)
arch/riscv/kernel/signal.c:94:16:    expected void *__val
arch/riscv/kernel/signal.c:94:16:    got void [noderef] __user *[assigned] datap
Fixes:  8ee0b41898fa26f66e32 ("riscv: signal: Add sigcontext save/restore for vector")
Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
---
 arch/riscv/kernel/signal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index 88b6220b2608..33dfb5078301 100644
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -91,7 +91,7 @@ static long save_v_state(struct pt_regs *regs, void __user **sc_vec)
 	err = __copy_to_user(&state->v_state, &current->thread.vstate,
 			     offsetof(struct __riscv_v_ext_state, datap));
 	/* Copy the pointer datap itself. */
-	err |= __put_user(datap, &state->v_state.datap);
+	err |= __put_user((__force void *)datap, &state->v_state.datap);
 	/* Copy the whole vector content to user space datap. */
 	err |= __copy_to_user(datap, current->thread.vstate.datap, riscv_v_vsize);
 	/* Copy magic to the user space after saving  all vector conetext */
-- 
2.37.2.352.g3c44437643