change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/arch/x86/include/asm/futex.h
..
..
@@ -12,76 +12,103 @@
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 #include <asm/processor.h>
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 #include <asm/smap.h>
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14
 
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-#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg)	\
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-	asm volatile("\t" ASM_STAC "\n"				\
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-		     "1:\t" insn "\n"				\
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-		     "2:\t" ASM_CLAC "\n"			\
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+#define unsafe_atomic_op1(insn, oval, uaddr, oparg, label)	\
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+do {								\
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+	int oldval = 0, ret;					\
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+	asm volatile("1:\t" insn "\n"				\
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+		     "2:\n"					\
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 		     "\t.section .fixup,\"ax\"\n"		\
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 		     "3:\tmov\t%3, %1\n"			\
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 		     "\tjmp\t2b\n"				\
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 		     "\t.previous\n"				\
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-		     _ASM_EXTABLE(1b, 3b)			\
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+		     _ASM_EXTABLE_UA(1b, 3b)			\
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 		     : "=r" (oldval), "=r" (ret), "+m" (*uaddr)	\
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-		     : "i" (-EFAULT), "0" (oparg), "1" (0))
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+		     : "i" (-EFAULT), "0" (oparg), "1" (0));	\
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+	if (ret)						\
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+		goto label;					\
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+	*oval = oldval;						\
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+} while(0)
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-#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg)	\
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-	asm volatile("\t" ASM_STAC "\n"				\
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-		     "1:\tmovl	%2, %0\n"			\
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-		     "\tmovl\t%0, %3\n"				\
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+
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+#define unsafe_atomic_op2(insn, oval, uaddr, oparg, label)	\
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+do {								\
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+	int oldval = 0, ret, tem;				\
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+	asm volatile("1:\tmovl	%2, %0\n"			\
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+		     "2:\tmovl\t%0, %3\n"			\
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 		     "\t" insn "\n"				\
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-		     "2:\t" LOCK_PREFIX "cmpxchgl %3, %2\n"	\
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-		     "\tjnz\t1b\n"				\
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-		     "3:\t" ASM_CLAC "\n"			\
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+		     "3:\t" LOCK_PREFIX "cmpxchgl %3, %2\n"	\
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+		     "\tjnz\t2b\n"				\
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+		     "4:\n"					\
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 		     "\t.section .fixup,\"ax\"\n"		\
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-		     "4:\tmov\t%5, %1\n"			\
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-		     "\tjmp\t3b\n"				\
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+		     "5:\tmov\t%5, %1\n"			\
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+		     "\tjmp\t4b\n"				\
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 		     "\t.previous\n"				\
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-		     _ASM_EXTABLE(1b, 4b)			\
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-		     _ASM_EXTABLE(2b, 4b)			\
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+		     _ASM_EXTABLE_UA(1b, 5b)			\
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+		     _ASM_EXTABLE_UA(3b, 5b)			\
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 		     : "=&a" (oldval), "=&r" (ret),		\
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 		       "+m" (*uaddr), "=&r" (tem)		\
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-		     : "r" (oparg), "i" (-EFAULT), "1" (0))
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+		     : "r" (oparg), "i" (-EFAULT), "1" (0));	\
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+	if (ret)						\
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+		goto label;					\
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+	*oval = oldval;						\
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+} while(0)
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55
 
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-static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
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+static __always_inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
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 		u32 __user *uaddr)
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 {
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-	int oldval = 0, ret, tem;
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-
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-	pagefault_disable();
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+	if (!user_access_begin(uaddr, sizeof(u32)))
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+		return -EFAULT;
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61
 
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 	switch (op) {
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 	case FUTEX_OP_SET:
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-		__futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg);
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+		unsafe_atomic_op1("xchgl %0, %2", oval, uaddr, oparg, Efault);
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 		break;
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 	case FUTEX_OP_ADD:
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-		__futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, oldval,
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-				   uaddr, oparg);
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+		unsafe_atomic_op1(LOCK_PREFIX "xaddl %0, %2", oval,
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+				   uaddr, oparg, Efault);
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 		break;
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 	case FUTEX_OP_OR:
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-		__futex_atomic_op2("orl %4, %3", ret, oldval, uaddr, oparg);
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+		unsafe_atomic_op2("orl %4, %3", oval, uaddr, oparg, Efault);
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 		break;
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 	case FUTEX_OP_ANDN:
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-		__futex_atomic_op2("andl %4, %3", ret, oldval, uaddr, ~oparg);
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+		unsafe_atomic_op2("andl %4, %3", oval, uaddr, ~oparg, Efault);
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 		break;
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 	case FUTEX_OP_XOR:
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-		__futex_atomic_op2("xorl %4, %3", ret, oldval, uaddr, oparg);
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+		unsafe_atomic_op2("xorl %4, %3", oval, uaddr, oparg, Efault);
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 		break;
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 	default:
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-		ret = -ENOSYS;
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+		user_access_end();
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+		return -ENOSYS;
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 	}
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-
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-	pagefault_enable();
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-
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-	if (!ret)
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-		*oval = oldval;
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-
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-	return ret;
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+	user_access_end();
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+	return 0;
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+Efault:
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+	user_access_end();
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+	return -EFAULT;
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 }
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 static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
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 						u32 oldval, u32 newval)
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 {
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-	return user_atomic_cmpxchg_inatomic(uval, uaddr, oldval, newval);
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+	int ret = 0;
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+
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+	if (!user_access_begin(uaddr, sizeof(u32)))
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+		return -EFAULT;
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+	asm volatile("\n"
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+		"1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n"
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+		"2:\n"
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+		"\t.section .fixup, \"ax\"\n"
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+		"3:\tmov     %3, %0\n"
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+		"\tjmp     2b\n"
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+		"\t.previous\n"
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+		_ASM_EXTABLE_UA(1b, 3b)
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+		: "+r" (ret), "=a" (oldval), "+m" (*uaddr)
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+		: "i" (-EFAULT), "r" (newval), "1" (oldval)
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+		: "memory"
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+	);
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+	user_access_end();
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+	*uval = oldval;
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+	return ret;
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 }
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 #endif