Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 272 insertions, 0 deletions

diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h
new file mode 100644
index 000000000..a84333ade
--- /dev/null
+++ b/arch/x86/include/asm/syscall_wrapper.h
@@ -0,0 +1,272 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * syscall_wrapper.h - x86 specific wrappers to syscall definitions
+ */
+
+#ifndef _ASM_X86_SYSCALL_WRAPPER_H
+#define _ASM_X86_SYSCALL_WRAPPER_H
+
+struct pt_regs;
+
+extern long __x64_sys_ni_syscall(const struct pt_regs *regs);
+extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
+
+/*
+ * Instead of the generic __SYSCALL_DEFINEx() definition, the x86 version takes
+ * struct pt_regs *regs as the only argument of the syscall stub(s) named as:
+ * __x64_sys_*()         - 64-bit native syscall
+ * __ia32_sys_*()        - 32-bit native syscall or common compat syscall
+ * __ia32_compat_sys_*() - 32-bit compat syscall
+ * __x32_compat_sys_*()  - 64-bit X32 compat syscall
+ *
+ * The registers are decoded according to the ABI:
+ * 64-bit: RDI, RSI, RDX, R10, R8, R9
+ * 32-bit: EBX, ECX, EDX, ESI, EDI, EBP
+ *
+ * The stub then passes the decoded arguments to the __se_sys_*() wrapper to
+ * perform sign-extension (omitted for zero-argument syscalls).  Finally the
+ * arguments are passed to the __do_sys_*() function which is the actual
+ * syscall.  These wrappers are marked as inline so the compiler can optimize
+ * the functions where appropriate.
+ *
+ * Example assembly (slightly re-ordered for better readability):
+ *
+ * <__x64_sys_recv>:		<-- syscall with 4 parameters
+ *	callq	<__fentry__>
+ *
+ *	mov	0x70(%rdi),%rdi	<-- decode regs->di
+ *	mov	0x68(%rdi),%rsi	<-- decode regs->si
+ *	mov	0x60(%rdi),%rdx	<-- decode regs->dx
+ *	mov	0x38(%rdi),%rcx	<-- decode regs->r10
+ *
+ *	xor	%r9d,%r9d	<-- clear %r9
+ *	xor	%r8d,%r8d	<-- clear %r8
+ *
+ *	callq	__sys_recvfrom	<-- do the actual work in __sys_recvfrom()
+ *				    which takes 6 arguments
+ *
+ *	cltq			<-- extend return value to 64-bit
+ *	retq			<-- return
+ *
+ * This approach avoids leaking random user-provided register content down
+ * the call chain.
+ */
+
+/* Mapping of registers to parameters for syscalls on x86-64 and x32 */
+#define SC_X86_64_REGS_TO_ARGS(x, ...)					\
+	__MAP(x,__SC_ARGS						\
+		,,regs->di,,regs->si,,regs->dx				\
+		,,regs->r10,,regs->r8,,regs->r9)			\
+
+/* Mapping of registers to parameters for syscalls on i386 */
+#define SC_IA32_REGS_TO_ARGS(x, ...)					\
+	__MAP(x,__SC_ARGS						\
+	      ,,(unsigned int)regs->bx,,(unsigned int)regs->cx		\
+	      ,,(unsigned int)regs->dx,,(unsigned int)regs->si		\
+	      ,,(unsigned int)regs->di,,(unsigned int)regs->bp)
+
+#define __SYS_STUB0(abi, name)						\
+	long __##abi##_##name(const struct pt_regs *regs);		\
+	ALLOW_ERROR_INJECTION(__##abi##_##name, ERRNO);			\
+	long __##abi##_##name(const struct pt_regs *regs)		\
+		__alias(__do_##name);
+
+#define __SYS_STUBx(abi, name, ...)					\
+	long __##abi##_##name(const struct pt_regs *regs);		\
+	ALLOW_ERROR_INJECTION(__##abi##_##name, ERRNO);			\
+	long __##abi##_##name(const struct pt_regs *regs)		\
+	{								\
+		return __se_##name(__VA_ARGS__);			\
+	}
+
+#define __COND_SYSCALL(abi, name)					\
+	__weak long __##abi##_##name(const struct pt_regs *__unused)	\
+	{								\
+		return sys_ni_syscall();				\
+	}
+
+#define __SYS_NI(abi, name)						\
+	SYSCALL_ALIAS(__##abi##_##name, sys_ni_posix_timers);
+
+#ifdef CONFIG_X86_64
+#define __X64_SYS_STUB0(name)						\
+	__SYS_STUB0(x64, sys_##name)
+
+#define __X64_SYS_STUBx(x, name, ...)					\
+	__SYS_STUBx(x64, sys##name,					\
+		    SC_X86_64_REGS_TO_ARGS(x, __VA_ARGS__))
+
+#define __X64_COND_SYSCALL(name)					\
+	__COND_SYSCALL(x64, sys_##name)
+
+#define __X64_SYS_NI(name)						\
+	__SYS_NI(x64, sys_##name)
+#else /* CONFIG_X86_64 */
+#define __X64_SYS_STUB0(name)
+#define __X64_SYS_STUBx(x, name, ...)
+#define __X64_COND_SYSCALL(name)
+#define __X64_SYS_NI(name)
+#endif /* CONFIG_X86_64 */
+
+#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
+#define __IA32_SYS_STUB0(name)						\
+	__SYS_STUB0(ia32, sys_##name)
+
+#define __IA32_SYS_STUBx(x, name, ...)					\
+	__SYS_STUBx(ia32, sys##name,					\
+		    SC_IA32_REGS_TO_ARGS(x, __VA_ARGS__))
+
+#define __IA32_COND_SYSCALL(name)					\
+	__COND_SYSCALL(ia32, sys_##name)
+
+#define __IA32_SYS_NI(name)						\
+	__SYS_NI(ia32, sys_##name)
+#else /* CONFIG_X86_32 || CONFIG_IA32_EMULATION */
+#define __IA32_SYS_STUB0(name)
+#define __IA32_SYS_STUBx(x, name, ...)
+#define __IA32_COND_SYSCALL(name)
+#define __IA32_SYS_NI(name)
+#endif /* CONFIG_X86_32 || CONFIG_IA32_EMULATION */
+
+#ifdef CONFIG_IA32_EMULATION
+/*
+ * For IA32 emulation, we need to handle "compat" syscalls *and* create
+ * additional wrappers (aptly named __ia32_sys_xyzzy) which decode the
+ * ia32 regs in the proper order for shared or "common" syscalls. As some
+ * syscalls may not be implemented, we need to expand COND_SYSCALL in
+ * kernel/sys_ni.c and SYS_NI in kernel/time/posix-stubs.c to cover this
+ * case as well.
+ */
+#define __IA32_COMPAT_SYS_STUB0(name)					\
+	__SYS_STUB0(ia32, compat_sys_##name)
+
+#define __IA32_COMPAT_SYS_STUBx(x, name, ...)				\
+	__SYS_STUBx(ia32, compat_sys##name,				\
+		    SC_IA32_REGS_TO_ARGS(x, __VA_ARGS__))
+
+#define __IA32_COMPAT_COND_SYSCALL(name)				\
+	__COND_SYSCALL(ia32, compat_sys_##name)
+
+#define __IA32_COMPAT_SYS_NI(name)					\
+	__SYS_NI(ia32, compat_sys_##name)
+
+#else /* CONFIG_IA32_EMULATION */
+#define __IA32_COMPAT_SYS_STUB0(name)
+#define __IA32_COMPAT_SYS_STUBx(x, name, ...)
+#define __IA32_COMPAT_COND_SYSCALL(name)
+#define __IA32_COMPAT_SYS_NI(name)
+#endif /* CONFIG_IA32_EMULATION */
+
+
+#ifdef CONFIG_X86_X32
+/*
+ * For the x32 ABI, we need to create a stub for compat_sys_*() which is aware
+ * of the x86-64-style parameter ordering of x32 syscalls. The syscalls common
+ * with x86_64 obviously do not need such care.
+ */
+#define __X32_COMPAT_SYS_STUB0(name)					\
+	__SYS_STUB0(x32, compat_sys_##name)
+
+#define __X32_COMPAT_SYS_STUBx(x, name, ...)				\
+	__SYS_STUBx(x32, compat_sys##name,				\
+		    SC_X86_64_REGS_TO_ARGS(x, __VA_ARGS__))
+
+#define __X32_COMPAT_COND_SYSCALL(name)					\
+	__COND_SYSCALL(x32, compat_sys_##name)
+
+#define __X32_COMPAT_SYS_NI(name)					\
+	__SYS_NI(x32, compat_sys_##name)
+#else /* CONFIG_X86_X32 */
+#define __X32_COMPAT_SYS_STUB0(name)
+#define __X32_COMPAT_SYS_STUBx(x, name, ...)
+#define __X32_COMPAT_COND_SYSCALL(name)
+#define __X32_COMPAT_SYS_NI(name)
+#endif /* CONFIG_X86_X32 */
+
+
+#ifdef CONFIG_COMPAT
+/*
+ * Compat means IA32_EMULATION and/or X86_X32. As they use a different
+ * mapping of registers to parameters, we need to generate stubs for each
+ * of them.
+ */
+#define COMPAT_SYSCALL_DEFINE0(name)					\
+	static long							\
+	__do_compat_sys_##name(const struct pt_regs *__unused);		\
+	__IA32_COMPAT_SYS_STUB0(name)					\
+	__X32_COMPAT_SYS_STUB0(name)					\
+	static long							\
+	__do_compat_sys_##name(const struct pt_regs *__unused)
+
+#define COMPAT_SYSCALL_DEFINEx(x, name, ...)					\
+	static long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));	\
+	static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
+	__IA32_COMPAT_SYS_STUBx(x, name, __VA_ARGS__)				\
+	__X32_COMPAT_SYS_STUBx(x, name, __VA_ARGS__)				\
+	static long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))	\
+	{									\
+		return __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
+	}									\
+	static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
+
+/*
+ * As some compat syscalls may not be implemented, we need to expand
+ * COND_SYSCALL_COMPAT in kernel/sys_ni.c and COMPAT_SYS_NI in
+ * kernel/time/posix-stubs.c to cover this case as well.
+ */
+#define COND_SYSCALL_COMPAT(name) 					\
+	__IA32_COMPAT_COND_SYSCALL(name)				\
+	__X32_COMPAT_COND_SYSCALL(name)
+
+#define COMPAT_SYS_NI(name)						\
+	__IA32_COMPAT_SYS_NI(name)					\
+	__X32_COMPAT_SYS_NI(name)
+
+#endif /* CONFIG_COMPAT */
+
+#define __SYSCALL_DEFINEx(x, name, ...)					\
+	static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));	\
+	static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
+	__X64_SYS_STUBx(x, name, __VA_ARGS__)				\
+	__IA32_SYS_STUBx(x, name, __VA_ARGS__)				\
+	static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))	\
+	{								\
+		long ret = __do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__));\
+		__MAP(x,__SC_TEST,__VA_ARGS__);				\
+		__PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__));	\
+		return ret;						\
+	}								\
+	static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
+
+/*
+ * As the generic SYSCALL_DEFINE0() macro does not decode any parameters for
+ * obvious reasons, and passing struct pt_regs *regs to it in %rdi does not
+ * hurt, we only need to re-define it here to keep the naming congruent to
+ * SYSCALL_DEFINEx() -- which is essential for the COND_SYSCALL() and SYS_NI()
+ * macros to work correctly.
+ */
+#define SYSCALL_DEFINE0(sname)						\
+	SYSCALL_METADATA(_##sname, 0);					\
+	static long __do_sys_##sname(const struct pt_regs *__unused);	\
+	__X64_SYS_STUB0(sname)						\
+	__IA32_SYS_STUB0(sname)						\
+	static long __do_sys_##sname(const struct pt_regs *__unused)
+
+#define COND_SYSCALL(name)						\
+	__X64_COND_SYSCALL(name)					\
+	__IA32_COND_SYSCALL(name)
+
+#define SYS_NI(name)							\
+	__X64_SYS_NI(name)						\
+	__IA32_SYS_NI(name)
+
+
+/*
+ * For VSYSCALLS, we need to declare these three syscalls with the new
+ * pt_regs-based calling convention for in-kernel use.
+ */
+long __x64_sys_getcpu(const struct pt_regs *regs);
+long __x64_sys_gettimeofday(const struct pt_regs *regs);
+long __x64_sys_time(const struct pt_regs *regs);
+
+#endif /* _ASM_X86_SYSCALL_WRAPPER_H */