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Make execl() vfork()-safe. This should fix potential bugs in rcp,

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telnet and tip, and probably a few other apps.

Reviewed by:	bde
Approved by:	jkh
This commit is contained in:
des 1998-10-14 18:53:36 +00:00
parent 7af544c9f9
commit e907ba88d0
1 changed files with 20 additions and 8 deletions
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28
lib/libc/gen/exec.c
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@ -36,7 +36,7 @@
static char sccsid[] = "@(#)exec.c 8.1 (Berkeley) 6/4/93";
#endif
static const char rcsid[] =
"$Id: exec.c,v 1.6 1997/10/14 07:23:16 bde Exp $";
"$Id: exec.c,v 1.7 1997/11/20 15:09:38 bde Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
@ -102,21 +102,33 @@ execl(name, arg, va_alist)
#endif
{
va_list ap;
int sverrno;
char **argv;
int n;
/* The following code is ugly, but makes execl() vfork()-safe. */
#if __STDC__
va_start(ap, arg);
#else
va_start(ap);
#endif
if ( (argv = buildargv(ap, arg, NULL)) )
(void)execve(name, argv, environ);
n = 0;
while (va_arg(ap, char *) != NULL)
n++ ;
va_end(ap);
sverrno = errno;
free(argv);
errno = sverrno;
return (-1);
argv = (char **)alloca((n + 1) * sizeof(*argv));
if (argv == NULL)
return (-1);
#if __STDC__
va_start(ap, arg);
#else
va_start(ap);
#endif
n = 0;
while ((argv[n] = va_arg(ap, char *)) != NULL)
n++;
va_end(ap);
return (execve(name, argv, environ));
}
int