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We're unnecessarily limiting the size of an ACL to less than what most
filesystems will support. Some users do hit the limit and it's
confusing and unnecessary.
It still seems prudent to impose some limit on the number of ACEs the
client gives us before passing it straight to kmalloc(). So, let's just
limit it to the maximum number that would be possible given the amount
of data left in the argument buffer.
That will still leave one limit beyond whatever the filesystem imposes:
the client and server negotiate a limit on the size of a request, which
we have to respect.
But we're no longer imposing any additional arbitrary limit.
struct nfs4_ace is 20 bytes on my system and the maximum call size we'll
negotiate is about a megabyte, so in practice this is limiting the
allocation here to about a megabyte.
Reported-by: "de Vandiere, Louis" <louis.devandiere@atos.net>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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This is a not-that-useful kmalloc wrapper. And I'd like one of the
callers to actually use something other than kmalloc.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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This is a cosmetic change for now; no change in behavior.
Note we're just depending on xdr_reserve_space to do the bounds checking
for us, we're not really depending on its adjustment of iovec or xdr_buf
lengths yet, as those are fixed up by as necessary after the fact by
read-link operations and by nfs4svc_encode_compoundres. However we do
have to update xdr->iov on read-like operations to prevent
xdr_reserve_space from messing with the already-fixed-up length of the
the head.
When the attribute encoding fails partway through we have to undo the
length adjustments made so far. We do it manually for now, but later
patches will add an xdr_truncate_encode() helper to handle cases like
this.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Pull nfsd updates from Bruce Fields:
- Handle some loose ends from the vfs read delegation support.
(For example nfsd can stop breaking leases on its own in a
fewer places where it can now depend on the vfs to.)
- Make life a little easier for NFSv4-only configurations
(thanks to Kinglong Mee).
- Fix some gss-proxy problems (thanks Jeff Layton).
- miscellaneous bug fixes and cleanup
* 'for-3.14' of git://linux-nfs.org/~bfields/linux: (38 commits)
nfsd: consider CLAIM_FH when handing out delegation
nfsd4: fix delegation-unlink/rename race
nfsd4: delay setting current_fh in open
nfsd4: minor nfs4_setlease cleanup
gss_krb5: use lcm from kernel lib
nfsd4: decrease nfsd4_encode_fattr stack usage
nfsd: fix encode_entryplus_baggage stack usage
nfsd4: simplify xdr encoding of nfsv4 names
nfsd4: encode_rdattr_error cleanup
nfsd4: nfsd4_encode_fattr cleanup
minor svcauth_gss.c cleanup
nfsd4: better VERIFY comment
nfsd4: break only delegations when appropriate
NFSD: Fix a memory leak in nfsd4_create_session
sunrpc: get rid of use_gssp_lock
sunrpc: fix potential race between setting use_gss_proxy and the upcall rpc_clnt
sunrpc: don't wait for write before allowing reads from use-gss-proxy file
nfsd: get rid of unused function definition
Define op_iattr for nfsd4_open instead using macro
NFSD: fix compile warning without CONFIG_NFSD_V3
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We can simplify the idmapping code if it does its own encoding and
returns nfs errors.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Remove the boilerplate code to marshall and unmarhall ACL objects into
xattrs and operate on the posix_acl objects directly. Also move all
the ACL handling code into nfs?acl.c where it belongs.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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These are internal nfsd interfaces.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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