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Don't let userland choose %rip. This is the Intel Sysret vulnerability 

again.
This commit is contained in:
maxv 2017-02-13 14:54:11 +00:00
parent 7f9c3b1be0
commit 062d91b570
1 changed files with 8 additions and 3 deletions
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9
sys/compat/linux/arch/amd64/linux_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: linux_machdep.c,v 1.49 2017/02/05 08:42:49 maxv Exp $ */
/* $NetBSD: linux_machdep.c,v 1.50 2017/02/13 14:54:11 maxv Exp $ */
/*-
* Copyright (c) 2005 Emmanuel Dreyfus, all rights reserved.
@ -33,7 +33,7 @@
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.49 2017/02/05 08:42:49 maxv Exp $");
__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.50 2017/02/13 14:54:11 maxv Exp $");
#include <sys/param.h>
#include <sys/types.h>
@ -236,6 +236,11 @@ linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
return;
}
if ((vaddr_t)catcher >= VM_MAXUSER_ADDRESS) {
sigexit(l, SIGILL);
return;
}
linux_buildcontext(l, catcher, sp);
tf->tf_rdi = sigframe.info.lsi_signo;
tf->tf_rax = 0;