Re: [RFC] setxattr bugs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 2/4/2013 6:14 PM, Jeff Mahoney wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 2/2/13 11:30 PM, Al Viro wrote:
>> * JFS, since 2005: setxattr(name, "system.posix_acl_access", NULL,
>> 0, 0) succeeds, creating an empty EA with "system.posix_acl_access"
>> as name. Validity checks should apply _after_ if (value == NULL) {
>> /* empty EA, do not remove */ value = ""; value_len = 0; } and not
>> before it. * reiserfs, since 2009: setxattr(name, attr_name, NULL,
>> 0, 0) is treated as removexattr(name, attr_name), not as emptying
>> given xattr.
>>
>> The question is, does either of those cross into "established 
>> weirdness in ABI" or are they still at the "bugs to be fixed"
>> stage?
> Since the behavior changed once already in 2009 I'd call it a bug.
> That code was in the SLES kernel for a while before then and I still
> haven't seen a bug report on it.
>
> - -Jeff
>
>> FWIW, I'm seriously tempted to stop passing NULL as the third
>> argument of ->setxattr(), essentially taking all those if (!value)
>> value = ""; pieces from individual ->setxattr() instances to
>> __vfs_setxattr_noperm() (all other callers of ->setxattr() never 
>> pass NULL data or 0 size, so it's irrelevant for them).  Would fix 
>> both jfs and reiserfs weirdness....
>>
>> Objections?

None from me. I know of no one using either of those filesystems
in ways I care about. There's a chance the SELinux crowd may care,
so I'm adding the LSM list. We're the primary consumer of xattrs.

>
> - -- 
> Jeff Mahoney
> SUSE Labs
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG/MacGPG2 v2.0.18 (Darwin)
> Comment: GPGTools - http://gpgtools.org
>
> iQIcBAEBAgAGBQJREGrwAAoJEB57S2MheeWyHvMP/3kpy3Y4U0KNavnPaeL12LXe
> RC6vIb/dPkoSemFiZ5om26aT70M7MdXJY2ZPCwgtlNpKV6aT0NFchtwiWos2lLLN
> XndvFZ4M/kQLd9yDEmlcTDZn7p4fhU2Tn7FYrhPLRmOO3zP6fnUxLozSebOnGTO/
> xEwV7Qtx7D4Au37khFW/hJvsAJE2Q3NrLgueIJLiTmFvSiOourZNmriNcB73MUeb
> vYx5gc/bJexS2oFWeQqD6WiL8UQXg4XEKRk4inNVrJWpLV365w45Kpf2zBlvCQwQ
> W8mdHcHoityOcQJtiXvnVDurUNpFwsthrhVquVgIopovlcvOjNtcpffH8YI9khP/
> yol7+57ZDuVx2TY5DrEOa+TOTUrg5ghqagSSmOVDsOVeMngpdFNs8351QcX0IWBn
> Xt8/eq46g/R7EHI3I1eYJHlMIie0hP1GDc66OP94hcKEWaHbPeKwkSTOlqYH++4h
> ncSJcxHXWLUTGuV4b61whYTlJ2vBWwEvIteVaQmmXKaOTr41lajZBCWZDeUlzna8
> XyJHE5FrcKDLzTNP1R7UNEj863fN0OUma1AKaT/6jNYMqFXOk39emTgZL5QfxP9X
> uLWG1OVDf87uw5nYOKubNQiORpxl8iSIsQWvZeF9SvvmFA/JzpgZgtLlNqYa78Yv
> oEq501m9BSEWVSGKxHcu
> =G2cU
> -----END PGP SIGNATURE-----
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>

--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux