powerpc/futex: Switch to user_access block

Use user_access_begin() instead of the access_ok/allow_access sequence.

This brings the missing might_fault() check.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6cd202cdc4f939d47822e4ddd3c0856210431a58.1615398498.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/include/asm/futex.h b/arch/powerpc/include/asm/futex.h
index e93ee32..b3001f8 100644 (file)
--- a/arch/powerpc/include/asm/futex.h
+++ b/arch/powerpc/include/asm/futex.h
@@ -33,9 +33,8 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
 {
        int oldval = 0, ret;
 
-       if (!access_ok(uaddr, sizeof(u32)))
+       if (!user_access_begin(uaddr, sizeof(u32)))
                return -EFAULT;
-       allow_read_write_user(uaddr, uaddr, sizeof(*uaddr));
 
        switch (op) {
        case FUTEX_OP_SET:
@@ -56,10 +55,10 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
        default:
                ret = -ENOSYS;
        }
+       user_access_end();
 
        *oval = oldval;
 
-       prevent_read_write_user(uaddr, uaddr, sizeof(*uaddr));
        return ret;
 }
 
@@ -70,11 +69,9 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
        int ret = 0;
        u32 prev;
 
-       if (!access_ok(uaddr, sizeof(u32)))
+       if (!user_access_begin(uaddr, sizeof(u32)))
                return -EFAULT;
 
-       allow_read_write_user(uaddr, uaddr, sizeof(*uaddr));
-
         __asm__ __volatile__ (
         PPC_ATOMIC_ENTRY_BARRIER
 "1:     lwarx   %1,0,%3         # futex_atomic_cmpxchg_inatomic\n\
@@ -93,8 +90,9 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
         : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)
         : "cc", "memory");
 
+       user_access_end();
+
        *uval = prev;
-       prevent_read_write_user(uaddr, uaddr, sizeof(*uaddr));
 
         return ret;
 }