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powerpc/signal32: Use fault_in_pages_readable() to prefault user context

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Use fault_in_pages_readable() to prefault user context
instead of open coding

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2018-04-24 18:04:25 +02:00 committed by Michael Ellerman
parent d04f11d271
commit 56b04d568f
1 changed files with 5 additions and 8 deletions
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13
arch/powerpc/kernel/signal_32.c
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@ -25,6 +25,7 @@
#include <linux/errno.h>
#include <linux/elf.h>
#include <linux/ptrace.h>
#include <linux/pagemap.h>
#include <linux/ratelimit.h>
#include <linux/syscalls.h>
#ifdef CONFIG_PPC64
@ -1049,7 +1050,6 @@ SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
#endif
{
struct pt_regs *regs = current_pt_regs();
unsigned char tmp __maybe_unused;
int ctx_has_vsx_region = 0;
#ifdef CONFIG_PPC64
@ -1113,9 +1113,8 @@ SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
}
if (new_ctx == NULL)
return 0;
if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
|| __get_user(tmp, (u8 __user *) new_ctx)
|| __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
if (!access_ok(VERIFY_READ, new_ctx, ctx_size) ||
fault_in_pages_readable((u8 __user *)new_ctx, ctx_size))
return -EFAULT;
/*
@ -1242,7 +1241,6 @@ SYSCALL_DEFINE3(debug_setcontext, struct ucontext __user *, ctx,
struct pt_regs *regs = current_pt_regs();
struct sig_dbg_op op;
int i;
unsigned char tmp __maybe_unused;
unsigned long new_msr = regs->msr;
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
unsigned long new_dbcr0 = current->thread.debug.dbcr0;
@ -1298,9 +1296,8 @@ SYSCALL_DEFINE3(debug_setcontext, struct ucontext __user *, ctx,
current->thread.debug.dbcr0 = new_dbcr0;
#endif
if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
|| __get_user(tmp, (u8 __user *) ctx)
|| __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) ||
fault_in_pages_readable((u8 __user *)ctx, sizeof(*ctx)))
return -EFAULT;
/*