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Add flags option to get xattr method paired to __vfs_getxattr
Add a flag option to get xattr method that could have a bit flag of XATTR_NOSECURITY passed to it. XATTR_NOSECURITY is generally then set in the __vfs_getxattr path when called by security infrastructure. This handles the case of a union filesystem driver that is being requested by the security layer to report back the xattr data. For the use case where access is to be blocked by the security layer. The path then could be security(dentry) -> __vfs_getxattr(dentry...XATTR_NOSECURITY) -> handler->get(dentry...XATTR_NOSECURITY) -> __vfs_getxattr(lower_dentry...XATTR_NOSECURITY) -> lower_handler->get(lower_dentry...XATTR_NOSECURITY) which would report back through the chain data and success as expected, the logging security layer at the top would have the data to determine the access permissions and report back the target context that was blocked. Without the get handler flag, the path on a union filesystem would be the errant security(dentry) -> __vfs_getxattr(dentry) -> handler->get(dentry) -> vfs_getxattr(lower_dentry) -> nested -> security(lower_dentry, log off) -> lower_handler->get(lower_dentry) which would report back through the chain no data, and -EACCES. For selinux for both cases, this would translate to a correctly determined blocked access. In the first case with this change a correct avc log would be reported, in the second legacy case an incorrect avc log would be reported against an uninitialized u:object_r:unlabeled:s0 context making the logs cosmetically useless for audit2allow. This patch series is inert and is the wide-spread addition of the flags option for xattr functions, and a replacement of __vfs_getxattr with __vfs_getxattr(...XATTR_NOSECURITY). Signed-off-by: Mark Salyzyn <salyzyn@android.com> Reviewed-by: Jan Kara <jack@suse.cz> Acked-by: Jan Kara <jack@suse.cz> Acked-by: Jeff Layton <jlayton@kernel.org> Acked-by: David Sterba <dsterba@suse.com> Acked-by: Darrick J. Wong <darrick.wong@oracle.com> Acked-by: Mike Marshall <hubcap@omnibond.com> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: John Stultz <john.stultz@linaro.org> To: linux-fsdevel@vger.kernel.org To: linux-unionfs@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-security-module@vger.kernel.org Cc: kernel-team@android.com v16 - rebase v15 - revert back to v4 as struct xattr_gs_args was not acceptable by the wider audience. Incorporate any relevant fixes on the way. v14 (new series): - Reincorporate back into the bugfix series for overlayfs v8: - Documentation reported 'struct xattr_gs_flags' rather than 'struct xattr_gs_flags *args' as argument to get and set methods. v7: - missed spots in fs/9p/acl.c, fs/afs/xattr.c, fs/ecryptfs/crypto.c, fs/ubifs/xattr.c, fs/xfs/libxfs/xfs_attr.c, security/integrity/evm/evm_main.c and security/smack/smack_lsm.c. v6: - kernfs missed a spot v5: - introduce struct xattr_gs_args for get and set methods, __vfs_getxattr and __vfs_setxattr functions. - cover a missing spot in ext2. - switch from snprintf to scnprintf for correctness. v4: - ifdef __KERNEL__ around XATTR_NOSECURITY to keep it colocated in uapi headers. v3: - poor aim on ubifs not ubifs_xattr_get, but static xattr_get v2: - Missed a spot: ubifs, erofs and afs. v1: - Removed from an overlayfs patch set, and made independent. Expect this to be the basis of some security improvements.
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