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From:   Christophe Leroy <christophe.leroy@csgroup.eu>
Subject: [PATCH 09/10] powerpc/signal32: Convert do_setcontext[_tm]() to user
 access block
To:     Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>, cmr@codefail.de
Cc:     linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Date:   Fri, 19 Mar 2021 11:06:58 +0000 (UTC)
Precedence: bulk

Add unsafe_get_user_sigset() and transform PPC32 get_sigset_t()
into an unsafe version unsafe_get_sigset_t().

Then convert do_setcontext() and do_setcontext_tm() to use
user_read_access_begin/end.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 arch/powerpc/kernel/signal.h    |  2 ++
 arch/powerpc/kernel/signal_32.c | 42 +++++++++++++++++++--------------
 2 files changed, 26 insertions(+), 18 deletions(-)

diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h
index a5152ff3c52f..f4aafa337c2e 100644
--- a/arch/powerpc/kernel/signal.h
+++ b/arch/powerpc/kernel/signal.h
@@ -25,6 +25,8 @@ static inline int __get_user_sigset(sigset_t *dst, const sigset_t __user *src)
 
 	return __get_user(dst->sig[0], (u64 __user *)&src->sig[0]);
 }
+#define unsafe_get_user_sigset(dst, src, label) \
+	unsafe_get_user((dst)->sig[0], (u64 __user *)&(src)->sig[0], label)
 
 #ifdef CONFIG_VSX
 extern unsigned long copy_vsx_to_user(void __user *to,
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 0b1a6f53e553..592b889e3836 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -83,12 +83,7 @@
  * implementation that makes things simple for little endian only)
  */
 #define unsafe_put_sigset_t	unsafe_put_compat_sigset
-
-static inline int get_sigset_t(sigset_t *set,
-			       const compat_sigset_t __user *uset)
-{
-	return get_compat_sigset(set, uset);
-}
+#define unsafe_get_sigset_t	unsafe_get_compat_sigset
 
 #define to_user_ptr(p)		ptr_to_compat(p)
 #define from_user_ptr(p)	compat_ptr(p)
@@ -144,10 +139,7 @@ __unsafe_restore_general_regs(struct pt_regs *regs, struct mcontext __user *sr)
 	unsafe_copy_to_user(__us, __s, sizeof(*__us), label);		\
 } while (0)
 
-static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
-{
-	return __get_user_sigset(set, uset);
-}
+#define unsafe_get_sigset_t	unsafe_get_user_sigset
 
 #define to_user_ptr(p)		((unsigned long)(p))
 #define from_user_ptr(p)	((void __user *)(p))
@@ -982,25 +974,31 @@ static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int
 	sigset_t set;
 	struct mcontext __user *mcp;
 
-	if (get_sigset_t(&set, &ucp->uc_sigmask))
+	if (user_read_access_begin(ucp, sizeof(*ucp)))
 		return -EFAULT;
+
+	unsafe_get_sigset_t(&set, &ucp->uc_sigmask, failed);
 #ifdef CONFIG_PPC64
 	{
 		u32 cmcp;
 
-		if (__get_user(cmcp, &ucp->uc_regs))
-			return -EFAULT;
+		unsafe_get_user(cmcp, &ucp->uc_regs, failed);
 		mcp = (struct mcontext __user *)(u64)cmcp;
 	}
 #else
-	if (__get_user(mcp, &ucp->uc_regs))
-		return -EFAULT;
+	unsafe_get_user(mcp, &ucp->uc_regs, failed);
 #endif
+	user_read_access_end();
+
 	set_current_blocked(&set);
 	if (restore_user_regs(regs, mcp, sig))
 		return -EFAULT;
 
 	return 0;
+
+failed:
+	user_read_access_end();
+	return -EFAULT;
 }
 
 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
@@ -1014,11 +1012,15 @@ static int do_setcontext_tm(struct ucontext __user *ucp,
 	u32 cmcp;
 	u32 tm_cmcp;
 
-	if (get_sigset_t(&set, &ucp->uc_sigmask))
+	if (user_read_access_begin(ucp, sizeof(*ucp)))
 		return -EFAULT;
 
-	if (__get_user(cmcp, &ucp->uc_regs) ||
-	    __get_user(tm_cmcp, &tm_ucp->uc_regs))
+	unsafe_get_sigset_t(&set, &ucp->uc_sigmask, failed);
+	unsafe_get_user(cmcp, &ucp->uc_regs, failed);
+
+	user_read_access_end();
+
+	if (__get_user(tm_cmcp, &tm_ucp->uc_regs))
 		return -EFAULT;
 	mcp = (struct mcontext __user *)(u64)cmcp;
 	tm_mcp = (struct mcontext __user *)(u64)tm_cmcp;
@@ -1029,6 +1031,10 @@ static int do_setcontext_tm(struct ucontext __user *ucp,
 		return -EFAULT;
 
 	return 0;
+
+failed:
+	user_read_access_end();
+	return -EFAULT;
 }
 #endif
 
-- 
2.25.0