linux-kernel - [PATCH 06/10] powerpc/signal32: Perform access_ok() inside restore_user

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Message-Id: <c106eb2f37c3040f1fd38b40e50c670feb7cb835.1616151715.git.christophe.leroy@csgroup.eu>
Date:   Fri, 19 Mar 2021 11:06:55 +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>, cmr@...efail.de
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 06/10] powerpc/signal32: Perform access_ok() inside
 restore_user_regs()

In preparation of using user_access_begin/end in restore_user_regs(),
move the access_ok() inside the function.

It makes no difference as the behaviour on a failed access_ok() is
the same as on failed restore_user_regs().

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/signal_32.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 8dfe4fe77706..e2b1d2a0abad 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -492,6 +492,8 @@ static long restore_user_regs(struct pt_regs *regs,
 	int i;
 #endif
 
+	if (!access_ok(sr, sizeof(*sr)))
+		return 1;
 	/*
 	 * restore general registers but not including MSR or SOFTE. Also
 	 * take care of keeping r2 (TLS) intact if not a signal
@@ -963,13 +965,10 @@ static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int
 		if (__get_user(cmcp, &ucp->uc_regs))
 			return -EFAULT;
 		mcp = (struct mcontext __user *)(u64)cmcp;
-		/* no need to check access_ok(mcp), since mcp < 4GB */
 	}
 #else
 	if (__get_user(mcp, &ucp->uc_regs))
 		return -EFAULT;
-	if (!access_ok(mcp, sizeof(*mcp)))
-		return -EFAULT;
 #endif
 	set_current_blocked(&set);
 	if (restore_user_regs(regs, mcp, sig))
@@ -1362,8 +1361,7 @@ SYSCALL_DEFINE0(sigreturn)
 	} else {
 		sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
 		addr = sr;
-		if (!access_ok(sr, sizeof(*sr))
-		    || restore_user_regs(regs, sr, 1))
+		if (restore_user_regs(regs, sr, 1))
 			goto badframe;
 	}
 
-- 
2.25.0