From 5249385ad7f0ac178433f0ae9cc5b64612c8ff77 Mon Sep 17 00:00:00 2001
From: Jordan Niethe <jniethe5@gmail.com>
Date: Wed, 6 May 2020 13:40:36 +1000
Subject: [PATCH] powerpc: Define and use get_user_instr() et. al.
References: jsc#SLE-13847
Patch-mainline: v5.8-rc1
Git-commit: 5249385ad7f0ac178433f0ae9cc5b64612c8ff77
Define specialised get_user_instr(), __get_user_instr() and
__get_user_instr_inatomic() macros for reading instructions from user
and/or kernel space.
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Alistair Popple <alistair@popple.id.au>
[mpe: Squash in addition of get_user_instr() & __user annotations]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-17-jniethe5@gmail.com
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/include/asm/uaccess.h | 9 +++++++++
arch/powerpc/kernel/align.c | 2 +-
arch/powerpc/kernel/hw_breakpoint.c | 2 +-
arch/powerpc/kernel/vecemu.c | 2 +-
4 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 2f500debae21..0d2d0c3dc527 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -105,6 +105,15 @@ static inline int __access_ok(unsigned long addr, unsigned long size,
#define __put_user_inatomic(x, ptr) \
__put_user_nosleep((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
+#define get_user_instr(x, ptr) \
+ get_user((x).val, (u32 __user *)(ptr))
+
+#define __get_user_instr(x, ptr) \
+ __get_user_nocheck((x).val, (u32 __user *)(ptr), sizeof(u32), true)
+
+#define __get_user_instr_inatomic(x, ptr) \
+ __get_user_nosleep((x).val, (u32 __user *)(ptr), sizeof(u32))
+
extern long __put_user_bad(void);
/*
diff --git a/arch/powerpc/kernel/align.c b/arch/powerpc/kernel/align.c
index 9b35d6160507..1f1ce8b86d5b 100644
--- a/arch/powerpc/kernel/align.c
+++ b/arch/powerpc/kernel/align.c
@@ -305,7 +305,7 @@ int fix_alignment(struct pt_regs *regs)
*/
CHECK_FULL_REGS(regs);
- if (unlikely(__get_user(instr.val, (unsigned int __user *)regs->nip)))
+ if (unlikely(__get_user_instr(instr, (void __user *)regs->nip)))
return -EFAULT;
if ((regs->msr & MSR_LE) != (MSR_KERNEL & MSR_LE)) {
/* We don't handle PPC little-endian any more... */
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
index 2db9a7ac7bcb..423603c92c0f 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -249,7 +249,7 @@ static bool stepping_handler(struct pt_regs *regs, struct perf_event *bp,
struct instruction_op op;
unsigned long addr = info->address;
- if (__get_user_inatomic(instr.val, (unsigned int *)regs->nip))
+ if (__get_user_instr_inatomic(instr, (void __user *)regs->nip))
goto fail;
ret = analyse_instr(&op, regs, instr);
diff --git a/arch/powerpc/kernel/vecemu.c b/arch/powerpc/kernel/vecemu.c
index 3dd70eeb10c5..ae632569446f 100644
--- a/arch/powerpc/kernel/vecemu.c
+++ b/arch/powerpc/kernel/vecemu.c
@@ -266,7 +266,7 @@ int emulate_altivec(struct pt_regs *regs)
unsigned int va, vb, vc, vd;
vector128 *vrs;
- if (get_user(instr.val, (unsigned int __user *)regs->nip))
+ if (get_user_instr(instr, (void __user *)regs->nip))
return -EFAULT;
word = ppc_inst_val(instr);
--
2.26.2