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If a null pointer argument is passed to setcontext(), exit the process; it

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would appear that overloading the argument this way is used by SVR4 to `fall
off' the main context (uc_link being NULL) after a function set up using
makecontext() returns.
This commit is contained in:
kleink 1999-01-12 00:16:40 +00:00
parent eb2918dbf7
commit bb6c814341
1 changed files with 7 additions and 3 deletions
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10
sys/compat/svr4/svr4_signal.c
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@ -1,4 +1,4 @@
/* $NetBSD: svr4_signal.c,v 1.31 1998/10/06 08:51:14 thorpej Exp $ */
/* $NetBSD: svr4_signal.c,v 1.32 1999/01/12 00:16:40 kleink Exp $ */
/*-
* Copyright (c) 1994, 1998 The NetBSD Foundation, Inc.
@ -47,6 +47,7 @@
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/malloc.h>
#include <sys/wait.h>
#include <sys/syscallargs.h>
@ -558,9 +559,12 @@ svr4_sys_context(p, v, retval)
case 1:
DPRINTF(("setcontext(%p)\n", SCARG(uap, uc)));
if ((error = copyin(SCARG(uap, uc), &uc, sizeof(uc))) != 0)
if (SCARG(uap, uc) == NULL)
exit1(p, W_EXITCODE(0, 0));
else if ((error = copyin(SCARG(uap, uc), &uc, sizeof(uc))) != 0)
return error;
return svr4_setcontext(p, &uc);
else
return svr4_setcontext(p, &uc);
default:
DPRINTF(("context(%d, %p)\n", SCARG(uap, func),