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bug#18216: Issue with chmod and chown in gzip.c?


From: Frédéric Castelain
Subject: bug#18216: Issue with chmod and chown in gzip.c?
Date: Thu, 7 Aug 2014 17:18:06 +0000

Hi,
Isn't there an issue with the order of the chown and chmod calls in gzip.c?
The source code is now :

#ifndef NO_CHOWN
    /* Copy ownership */
# if HAVE_FCHOWN
    ignore_value (fchown (ofd, ifstat->st_uid, ifstat->st_gid));
# elif HAVE_CHOWN
    ignore_value (chown (ofname, ifstat->st_uid, ifstat->st_gid));
# endif
#endif

    /* Copy the protection modes */
#if HAVE_FCHMOD
    r = fchmod (ofd, mode);
#else
    r = chmod (ofname, mode);
#endif
    if (r != 0) {
        int e = errno;
        WARN ((stderr, "%s: ", program_name));
        if (!quiet) {
            errno = e;
            perror(ofname);
        }
    }
... but back in version 1.3.5 it was:
    /* Copy the protection modes */
    if (chmod(ofname, ifstat->st_mode & 07777)) {
       int e = errno;
       WARN((stderr, "%s: ", progname));
       if (!quiet) {
           errno = e;
           perror(ofname);
       }
    }
#ifndef NO_CHOWN
    chown(ofname, ifstat->st_uid, ifstat->st_gid);  /* Copy ownership */
#endif

(= chmod 1rst, chown 2nd)

We have recently changed servers, thus upgraded from version 1.3.5 to version 
1.3.12, and using an "app_user" user we can't compress .pdf files generated by 
user oracle any longer.
See the following example:
address@hidden tmp]$ ll 854FAC16809WtT6Ds6dn.pdf
-rw-rw-r-- 1 oracle oinstall 100340  7 août  19:07 854FAC16809WtT6Ds6dn.pdf
address@hidden tmp]$ gzip 854FAC16809WtT6Ds6dn.pdf
gzip: 854FAC16809WtT6Ds6dn.pdf.gz: Operation not permitted
address@hidden tmp]$ echo $?
2
address@hidden tmp]$ ll 854FAC16809WtT6Ds6dn.pdf*
-rw------- 1 oracle oinstall 79847  7 août  19:07 854FAC16809WtT6Ds6dn.pdf.gz

Isn't this a bug?
Best regards.


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Frédéric CASTELAIN
STEF IT - Service A&D
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