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Prevent recursive IO signals. This prevents crashes when pieces of text are 

pasted in say an Xterm. Each char might create a SIGIO running out of
stackspace very quickly!
This commit is contained in:
reinoud 2012-02-15 15:20:53 +00:00
parent d99b3bd499
commit 54e9432c0a
1 changed files with 7 additions and 2 deletions
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9
sys/arch/usermode/usermode/trap.c
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@ -1,4 +1,4 @@
/* $NetBSD: trap.c,v 1.62 2012/01/22 17:51:39 reinoud Exp $ */
/* $NetBSD: trap.c,v 1.63 2012/02/15 15:20:53 reinoud Exp $ */
/*-
* Copyright (c) 2011 Reinoud Zandijk <reinoud@netbsd.org>
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.62 2012/01/22 17:51:39 reinoud Exp $");
__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.63 2012/02/15 15:20:53 reinoud Exp $");
#include <sys/types.h>
#include <sys/param.h>
@ -362,6 +362,11 @@ handle_signal(int sig, siginfo_t *info, void *ctx)
thunk_sigemptyset(&jump_ucp.uc_sigmask);
jump_ucp.uc_flags = _UC_STACK | _UC_CPU | _UC_SIGMASK;
/* prevent recursive IO signals */
if (sig == SIGIO)
thunk_sigaddset(&jump_ucp.uc_sigmask, SIGIO);
thunk_makecontext(&jump_ucp,
(void (*)(void)) f,
3, (void *) from_userland, (void *) pc, (void *) va);