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No longer assume that a process's address space can be directly written to.

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This commit is contained in:
David Greenman 1995-03-01 04:09:50 +00:00
parent f1df5d8bdd
commit 3aed948b88
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=6792
1 changed files with 24 additions and 15 deletions
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39
sys/kern/kern_exec.c
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@ -28,7 +28,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: kern_exec.c,v 1.12 1995/02/14 19:22:28 sos Exp $
* $Id: kern_exec.c,v 1.13 1995/02/20 22:23:11 davidg Exp $
*/
#include <sys/param.h>
@ -223,7 +223,7 @@ execve(p, uap, retval)
if (p->p_sysent->sv_fixup)
(*p->p_sysent->sv_fixup)(&stack_base, iparams);
else
*(--stack_base) = iparams->argc;
suword(--stack_base, iparams->argc);
/* close files on exec */
fdcloseexec(p);
@ -469,35 +469,44 @@ exec_copyout_strings(iparams)
envc = iparams->envc;
/*
* Fill in "ps_strings" struct for ps, w, etc.
* Copy out strings - arguments and environment.
*/
arginfo->ps_argvstr = destp;
arginfo->ps_nargvstr = argc;
copyout(stringp, destp, ARG_MAX - iparams->stringspace);
/*
* Copy the arg strings and fill in vector table as we go.
* Fill in "ps_strings" struct for ps, w, etc.
*/
suword(&arginfo->ps_argvstr, (int)destp);
suword(&arginfo->ps_nargvstr, argc);
/*
* Fill in argument portion of vector table.
*/
for (; argc > 0; --argc) {
*(vectp++) = destp;
while ((*destp++ = *stringp++));
suword(vectp++, (int)destp);
while (*stringp++ != 0)
destp++;
destp++;
}
/* a null vector table pointer seperates the argp's from the envp's */
*(vectp++) = NULL;
suword(vectp++, NULL);
arginfo->ps_envstr = destp;
arginfo->ps_nenvstr = envc;
suword(&arginfo->ps_envstr, (int)destp);
suword(&arginfo->ps_nenvstr, envc);
/*
* Copy the env strings and fill in vector table as we go.
* Fill in environment portion of vector table.
*/
for (; envc > 0; --envc) {
*(vectp++) = destp;
while ((*destp++ = *stringp++));
suword(vectp++, (int)destp);
while (*stringp++ != 0)
destp++;
destp++;
}
/* end of vector table is a null pointer */
*vectp = NULL;
suword(vectp, NULL);
return (stack_base);
}