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Do not restore SR on sigreturn: this could enable the user process to gain 

unpropre privileges.
This commit is contained in:
manu 2002-04-15 20:48:12 +00:00
parent 7b03e17cb9
commit 28a3cfe032
1 changed files with 4 additions and 5 deletions
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9
sys/compat/linux/arch/mips/linux_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: linux_machdep.c,v 1.12 2002/03/31 22:22:46 christos Exp $ */
/* $NetBSD: linux_machdep.c,v 1.13 2002/04/15 20:48:12 manu Exp $ */
/*-
* Copyright (c) 1995, 2000, 2001 The NetBSD Foundation, Inc.
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.12 2002/03/31 22:22:46 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.13 2002/04/15 20:48:12 manu Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -181,9 +181,9 @@ linux_sendsig(catcher, sig, mask, code) /* XXX Check me */
sf.lsf_sc.lsc_mdhi = f->f_regs[MULHI];
sf.lsf_sc.lsc_mdlo = f->f_regs[MULLO];
sf.lsf_sc.lsc_pc = f->f_regs[PC];
sf.lsf_sc.lsc_status = f->f_regs[SR]; /* XXX */
sf.lsf_sc.lsc_status = f->f_regs[SR];
sf.lsf_sc.lsc_cause = f->f_regs[CAUSE];
sf.lsf_sc.lsc_badvaddr = f->f_regs[BADVADDR]; /* XXX */
sf.lsf_sc.lsc_badvaddr = f->f_regs[BADVADDR];
/*
* Save signal stack. XXX broken
@ -270,7 +270,6 @@ linux_sys_sigreturn(p, v, retval)
f->f_regs[PC] = ksf.lsf_sc.lsc_pc;
f->f_regs[BADVADDR] = ksf.lsf_sc.lsc_badvaddr;
f->f_regs[CAUSE] = ksf.lsf_sc.lsc_cause;
f->f_regs[SR] = ksf.lsf_sc.lsc_status;
/* Restore signal stack. */
p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK;