Aittvax.187
net.bugs.v7,net.bugs.4bsd
utzoo!decvax!ittvax!swatt
Fri Jan  8 21:32:41 1982
pwd bug
Fri Jan  8 21:22:38 EST 1982 (ittvax!freb)

[ ]     The command "pwd" will do strange things if any of the
       directories above the present one lack execute permission.  It
       will print some random string, but not exit with an error
       status.  Programs which do 'popen ("pwd", "r")' in order to get
       the current directory can get fooled.

       The reason is in several places "pwd" never checks the return
       status on certain system calls.

       The fix is:
       ===============================================================
       cp /usr/src/cmd/pwd.c /tmp/upd.$$.tmp ; chmod +w /tmp/upd.$$.tmp
       ed - /tmp/upd.$$.tmp <<\!XXFUNNYXX ERRNO; DOTDOT, STATIC , . /USR/SRC/CMD/PWD.C /* EXIT ; Q !XXFUNNYXX W CHAR %S\":%S\N", { CANNOT STAT \ } (STDERR, 1C (CHDIR(DOTDOT)) @@@ *SYS_ERRLIST[]; CANNOT /TMP/UPD.$$.TMP DOT, FPRINTF &D)) (1); (STAT(DOT, TERRIBLE ERROR: CANNOT STAT \ 30C 22C OPEN CHECK */ DIFF \"%S\":%S\N", FPRINTF(STDERR,"PWD: (STAT("/", IF *SCCSID="@(#)pwd.c       4.2 (ITT) 01/08/82" SYS_ERRLIST[ERRNO]); 17A 34C 26C CANNOT STAT %S:%S\N EXTERN /\"!:%S\N",>/tmp/upd.$$.dif
       if cmp - /tmp/upd.$$.dif <<\!XXFUNNYXX STATIC ; < CHAR 1C1 --- *SCCSID="@(#)pwd.c       4.1 (Berkeley) 10/1/80"> static char *sccsid = "@(#)pwd.c       4.2 (ITT) 01/08/82";
       17a18,20
       > extern        errno;
       > extern        char *sys_errlist[];
       >
       22c25,29
               if (stat("/", &d)) {
       >               fprintf (stderr, "TERRIBLE ERROR: cannot stat \"/\"!:%s\n",
       >                        sys_errlist[errno]);
       >               exit (1);
       >       }
       26c33,37
                       if (stat(dot, &d)) {
       >                       fprintf (stderr, "Cannot stat \"%s\":%s\n",
       >                                dot, sys_errlist[errno]);
       >                       exit (1);
       >               }
       30c41,42
                               fprintf(stderr,"pwd: cannot open \"%s\":%s\n",
       >                               dotdot, sys_errlist[errno]);
       34c46,51
                       /* @@@ check */
       >               if (chdir(dotdot)) {
       >                       fprintf (stderr, "Cannot stat %s:%s\n", dotdot,
       >                                sys_errlist[errno]);
       >                       exit (1);
       >               }
       !xxFUNNYxx
       then
               : 'compare equal, ok'
               rm -f pwd.c
               cp /tmp/upd.$$.tmp pwd.c ; chmod a-w pwd.c
       else
               echo "Old source file not same version;" \
                       "use diff listings by hand"
       fi
       rm -f /tmp/upd.$$.tmp /tmp/upd.$$.dif
       ===============================================================

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