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Call check_mcontext to validate a register set passed in by ptrace.

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This commit is contained in:
fvdl 2003-10-23 17:45:14 +00:00
parent 4df6c69646
commit b9d0173421
1 changed files with 8 additions and 5 deletions
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13
sys/arch/amd64/amd64/process_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: process_machdep.c,v 1.2 2003/07/14 23:32:32 lukem Exp $ */
/* $NetBSD: process_machdep.c,v 1.3 2003/10/23 17:45:14 fvdl Exp $ */
/*-
* Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
@ -60,7 +60,7 @@
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.2 2003/07/14 23:32:32 lukem Exp $");
__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.3 2003/10/23 17:45:14 fvdl Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -148,14 +148,17 @@ process_write_regs(l, regp)
struct reg *regp;
{
struct trapframe *tf = process_frame(l);
int error;
long *regs = regp->regs;
/*
* Check for security violations.
* Note that struct regs is compatible with
* the __gregs array in mcontext_t.
*/
if (((regs[_REG_RFL] ^ tf->tf_rflags) & PSL_USERSTATIC) != 0 ||
!USERMODE(regs[_REG_CS], regs[_REG_RFL]))
return (EINVAL);
error = check_mcontext((mcontext_t *)regs, tf);
if (error != 0)
return error;
memcpy(tf, regs, sizeof (*tf));