[src/netbsd-1-4]: src/sys/miscfs/procfs Pull up revision 1.22 (requested by he):

[he <he%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ca0c4d607b5d
branches:  netbsd-1-4
changeset: 471321:ca0c4d607b5d
user:      he <he%NetBSD.org@localhost>
date:      Mon Jan 14 15:20:07 2002 +0000

description:
Pull up revision 1.22 (requested by he):
  Fix a ptrace/execve race condition which could be used to modify
  the child process' image during execve.  This would be a security
  issue due to setuid programs.

diffstat:

 sys/miscfs/procfs/procfs_ctl.c |  10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diffs (27 lines):

diff -r 247c222b1e30 -r ca0c4d607b5d sys/miscfs/procfs/procfs_ctl.c
--- a/sys/miscfs/procfs/procfs_ctl.c    Mon Jan 14 15:19:44 2002 +0000
+++ b/sys/miscfs/procfs/procfs_ctl.c    Mon Jan 14 15:20:07 2002 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: procfs_ctl.c,v 1.16 1997/04/28 04:49:34 mycroft Exp $  */
+/*     $NetBSD: procfs_ctl.c,v 1.16.16.1 2002/01/14 15:20:07 he Exp $  */
 
 /*
  * Copyright (c) 1993 Jan-Simon Pendry
@@ -106,10 +106,16 @@
        int error;
 
        /*
+        * You cannot do anything to the process if it is currently exec'ing
+        */
+       if (ISSET(p->p_flag, P_INEXEC))
+               return (EAGAIN);
+
+       switch (op) {
+       /*
         * Attach - attaches the target process for debugging
         * by the calling process.
         */
-       switch (op) {
        case PROCFS_CTL_ATTACH:
                /* 
                 * You can't attach to a process if: