linux-kernel - [RFC PATCH v1 15/19] powerpc/signal32: Switch handle_signal32() to user_access

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Message-Id: <fc36912524b7960933e86625746970a5c2426dcf.1597233555.git.christophe.leroy@csgroup.eu>
Date:   Wed, 12 Aug 2020 12:06:06 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, ldv@...linux.org,
        viro@...iv.linux.org.uk
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v1 15/19] powerpc/signal32: Switch handle_signal32() to
 user_access_begin() logic

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/signal_32.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 0d076c2a9f6c..4ea83578ba9d 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -1241,23 +1241,23 @@ int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
 
 	/* Set up Signal Frame */
 	frame = get_sigframe(ksig, tsk, sizeof(*frame), 1);
-	if (!access_ok(frame, sizeof(*frame)))
+	if (!user_write_access_begin(frame, sizeof(*frame)))
 		goto badframe;
 	sc = (struct sigcontext __user *) &frame->sctx;
 
 #if _NSIG != 64
 #error "Please adjust handle_signal()"
 #endif
-	if (__put_user(to_user_ptr(ksig->ka.sa.sa_handler), &sc->handler)
-	    || __put_user(oldset->sig[0], &sc->oldmask)
+	unsafe_put_user(to_user_ptr(ksig->ka.sa.sa_handler), &sc->handler, failed);
+	unsafe_put_user(oldset->sig[0], &sc->oldmask, failed);
 #ifdef CONFIG_PPC64
-	    || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
+	unsafe_put_user((oldset->sig[0] >> 32), &sc->_unused[3], failed);
 #else
-	    || __put_user(oldset->sig[1], &sc->_unused[3])
+	unsafe_put_user(oldset->sig[1], &sc->_unused[3], failed);
 #endif
-	    || __put_user(to_user_ptr(&frame->mctx), &sc->regs)
-	    || __put_user(ksig->sig, &sc->signal))
-		goto badframe;
+	unsafe_put_user(to_user_ptr(&frame->mctx), &sc->regs, failed);
+	unsafe_put_user(ksig->sig, &sc->signal, failed);
+	user_write_access_end();
 
 	if (vdso32_sigtramp && tsk->mm->context.vdso_base) {
 		sigret = 0;
@@ -1300,6 +1300,9 @@ int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
 	regs->msr &= ~MSR_LE;
 	return 0;
 
+failed:
+	user_write_access_end();
+
 badframe:
 	signal_fault(tsk, regs, "handle_signal32", frame);
 
-- 
2.25.0