Messages in this thread | | | From | Kyle Moffett <> | Subject | Re: [AppArmor 01/41] Pass struct vfsmount to the inode_create LSM hook | Date | Sat, 26 May 2007 01:20:50 -0400 |
| |
On May 24, 2007, at 14:58:41, Casey Schaufler wrote: > On Fedora zcat, gzip and gunzip are all links to the same file. I > can imagine (although it is a bit of a stretch) allowing a set of > users access to gunzip but not gzip (or the other way around).
That is a COMPLETE straw-man argument. I can override your "check" with this absolutely trivial perl code:
exec { "/usr/bin/gunzip" } "gzip", "-9", "some/file/to.gz";
Pathname-based checks are pretty fundamentally insecure. If you want to protect a "name", then you should tag the "name" with security attributes (IE: AppArmor). On the other hand, if you actually want to protect the _data_, then tagging the _name_ is flawed; tag the *DATA* instead.
Cheers, Kyle Moffett
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |