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RFC 5531 defines an MSG_ACCEPTED Reply message like this:
struct accepted_reply {
opaque_auth verf;
union switch (accept_stat stat) {
case SUCCESS:
...
In the current server code, struct opaque_auth encoding is open-
coded. Introduce a helper that encodes an opaque_auth data item
within the context of a xdr_stream.
Done as part of hardening the server-side RPC header decoding and
encoding paths.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
There's no RPC header field called rpc_stat; more precisely, the
variable appears to be recording an accept_stat value. But it looks
like we don't need to preserve this value at all, actually, so
simply remove the variable.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Commit 5b304bc5bf ("[PATCH] knfsd: svcrpc: gss: fix failure on
SVC_DENIED in integrity case") added a check to prevent wrapping an
RPC response if reply_stat == MSG_DENIED, assuming that the only way
to get to svcauth_gss_release() with that reply_stat value was if
the reject_stat was AUTH_ERROR (reject_stat == MISMATCH is handled
earlier in svc_process_common()).
The code there is somewhat confusing. For one thing, rpc_success is
an accept_stat value, not a reply_stat value. The correct reply_stat
value to look for is RPC_MSG_DENIED. It happens to be the same value
as rpc_success, so it all works out, but it's not terribly readable.
Since commit 438623a06b ("SUNRPC: Add svc_rqst::rq_auth_stat"),
the actual auth_stat value is stored in the svc_rqst, so that value
is now available to svcauth_gss_prepare_to_wrap() to make its
decision to wrap, based on direct information about the
authentication status of the RPC caller.
No behavior change is intended, this simply replaces some old code
with something that should be more self-documenting.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Actually xdr_stream does not add value here because of how
gss_wrap() works. This is just a clean-up patch.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Simplify the references to the head and tail iovecs for readability.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Match the error reporting in the other unwrap and wrap functions.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Clean up variable names to match the other unwrap and wrap
functions.
Additionally, the explicit type cast on @gsd in unnecessary; and
@resbuf is renamed to match the variable naming in the unwrap
functions.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Done as part of hardening the server-side RPC header decoding path.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Replace finicky logic: Instead of trying to find scratch space in
the response buffer, use the scratch buffer from struct
gss_svc_data.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
An error computing the checksum here is an exceptional event.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Clean up: To help orient readers, name the stack variables to match
the XDR field names.
Additionally, the explicit type cast on @gsd is unnecessary; and
@resbuf is renamed to match the variable naming in the unwrap
functions.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Now that upper layers use an xdr_stream to track the construction
of each RPC Reply message, resbuf->len is kept up-to-date
automatically. There's no need to recompute it in svc_gss_release().
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
The WARN_ON_ONCE check is not terribly useful. It also seems possible
for nfs4_find_file to race with the destruction of an fi_deleg_file
while trying to take a reference to it.
Now that it's safe to pass nfs_get_file a NULL pointer, remove the WARN
and NULL pointer check. Take the fi_lock when fetching fi_deleg_file.
Cc: NeilBrown <neilb@suse.de>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
...and remove some now-useless NULL pointer checks in its callers.
Suggested-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Currently nfsd4_setup_inter_ssc returns the vfsmount of the source
server's export when the mount completes. After the copy is done
nfsd4_cleanup_inter_ssc is called with the vfsmount of the source
server and it searches nfsd_ssc_mount_list for a matching entry
to do the clean up.
The problems with this approach are (1) the need to search the
nfsd_ssc_mount_list and (2) the code has to handle the case where
the matching entry is not found which looks ugly.
The enhancement is instead of nfsd4_setup_inter_ssc returning the
vfsmount, it returns the nfsd4_ssc_umount_item which has the
vfsmount embedded in it. When nfsd4_cleanup_inter_ssc is called
it's passed with the nfsd4_ssc_umount_item directly to do the
clean up so no searching is needed and there is no need to handle
the 'not found' case.
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
[ cel: adjusted whitespace and variable/function names ]
Reviewed-by: Olga Kornievskaia <kolga@netapp.com>
Now the entire RPC Call header parsing path is handled via struct
xdr_stream-based decoders.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Clean up: With xdr_stream decoding, the @argv parameter is no longer
used.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Done as part of hardening the server-side RPC header decoding path.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Clean up: Saving the RPC program number in two places is
unnecessary.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Now that each ->accept method has been converted to use xdr_stream,
the svcxdr_init_decode() calls can be hoisted back up into the
generic RPC server code.
The dprintk in svc_authenticate() is removed, since
trace_svc_authenticate() reports the same information.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Done as part of hardening the server-side RPC header decoding path.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Micro-optimizations:
1. The value of rqstp->rq_auth_stat is replaced no matter which
arm of the switch is taken, so the initial assignment can be
safely removed.
2. Avoid checking the value of gc->gc_proc twice in the I/O
(RPC_GSS_PROC_DATA) path.
The cost is a little extra code redundancy.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Done as part of hardening the server-side RPC header decoding path.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Done as part of hardening the server-side RPC header decoding path.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Clean up: To help orient readers, name the stack variables to match
the XDR field names.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Done as part of hardening the server-side RPC header decoding path.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Clean up: To help orient readers, name the stack variables to match
the XDR field names.
For readability, I'm also going to rename the unwrap and wrap
functions in a consistent manner, starting with unwrap_integ_data().
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Clean up / code de-duplication - this functionality is already
available in the generic XDR layer.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
The entire RPC_GSS_PROC_INIT path is converted over to xdr_stream
for decoding the Call credential and verifier.
Done as part of hardening the server-side RPC header decoding path.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
gss_read_verf() is already short. Fold it into its only caller.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
gss_read_common_verf() is now just a wrapper for dup_netobj(), thus
it can be replaced with direct calls to dup_netobj().
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Since upcalls are infrequent, ensure the compiler places the upcall
mechanism out-of-line from the I/O path.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Done as part of hardening the server-side RPC header decoding path.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Done as part of hardening the server-side RPC header decoding path.
Since the server-side of the Linux kernel SunRPC implementation
ignores the contents of the Call's machinename field, there's no
need for its RPC_AUTH_UNIX authenticator to reject names that are
larger than UNX_MAXNODENAME.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Done as part of hardening the server-side RPC header decoding path.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
RFC 5531 defines the body of an RPC Call message like this:
struct call_body {
unsigned int rpcvers;
unsigned int prog;
unsigned int vers;
unsigned int proc;
opaque_auth cred;
opaque_auth verf;
/* procedure-specific parameters start here */
};
In the current server code, decoding a struct opaque_auth type is
open-coded in several places, and is thus difficult to harden
everywhere.
Introduce a helper for decoding an opaque_auth within the context
of a xdr_stream. This helper can be shared with all authentication
flavor implemenations, even on the client-side.
Done as part of hardening the server-side RPC header decoding paths.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Refactor: So that the overhaul of each ->accept method can be done
in separate smaller patches, temporarily move the
svcxdr_init_decode() call into those methods.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Now that all vs_dispatch functions invoke svcxdr_init_decode(), it
is common code and can be pushed down into the generic RPC server.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Now with NFSD being able to cross into auto mounts,
the check can be removed.
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Ian Kent <raven@themaw.net>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Acked-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This function is only used by NFSD to cross mount points.
If a mount point is of type auto mount, follow_down() will
not uncover it. Add LOOKUP_AUTOMOUNT to the lookup flags
to have ->d_automount() called when NFSD walks down the
mount tree.
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Ian Kent <raven@themaw.net>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Currently nfsd_mountpoint() tests for mount points using d_mountpoint(),
this works only when a mount point is already uncovered.
In our case the mount point is of type auto mount and can be coverted.
i.e. ->d_automount() was not called.
Using d_managed() nfsd_mountpoint() can test whether a mount point is
either already uncovered or can be uncovered later.
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Ian Kent <raven@themaw.net>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Revert the recent change to the MTRR code which aimed to support
SEV-SNP guests on Hyper-V. It cuased a regression on XEN Dom0
kernels.
The underlying issue of MTTR (mis)handling in the x86 code needs some
deeper investigation and is definitely not 6.2 material.
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Merge tag 'x86-urgent-2023-02-19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fix from Thomas Gleixner:
"A single fix for x86.
Revert the recent change to the MTRR code which aimed to support
SEV-SNP guests on Hyper-V. It caused a regression on XEN Dom0 kernels.
The underlying issue of MTTR (mis)handling in the x86 code needs some
deeper investigation and is definitely not 6.2 material"
* tag 'x86-urgent-2023-02-19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mtrr: Revert 90b926e68f ("x86/pat: Fix pat_x_mtrr_type() for MTRR disabled case")
Posix-timers armed with a short interval with an ignored signal result
in an unpriviledged DoS. Due to the ignored signal the timer switches
into self rearm mode. This issue had been "fixed" before but a rework of
the alarmtimer code 5 years ago lost that workaround.
There is no real good solution for this issue, which is also worked around
in the core posix-timer code in the same way, but it certainly moved way
up on the ever growing todo list.
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Merge tag 'timers-urgent-2023-02-19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fix from Thomas Gleixner:
"A fix for a long standing issue in the alarmtimer code.
Posix-timers armed with a short interval with an ignored signal result
in an unpriviledged DoS. Due to the ignored signal the timer switches
into self rearm mode. This issue had been "fixed" before but a rework
of the alarmtimer code 5 years ago lost that workaround.
There is no real good solution for this issue, which is also worked
around in the core posix-timer code in the same way, but it certainly
moved way up on the ever growing todo list"
* tag 'timers-urgent-2023-02-19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
alarmtimer: Prevent starvation by small intervals and SIG_IGN
The addition of the new alloc/free interfaces in this cycle forgot to
add stub functions for pci_msix_alloc_irq_at() and pci_msix_free_irq()
for the CONFIG_PCI_MSI=n case
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Merge tag 'irq-urgent-2023-02-19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq fix from Thomas Gleixner:
"A single build fix for the PCI/MSI infrastructure.
The addition of the new alloc/free interfaces in this cycle forgot to
add stub functions for pci_msix_alloc_irq_at() and pci_msix_free_irq()
for the CONFIG_PCI_MSI=n case"
* tag 'irq-urgent-2023-02-19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
PCI/MSI: Provide missing stubs for CONFIG_PCI_MSI=n
* zero all padding for KVM_GET_DEBUGREGS
* fix rST warning
* disable vPMU support on hybrid CPUs
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm/x86 fixes from Paolo Bonzini:
- zero all padding for KVM_GET_DEBUGREGS
- fix rST warning
- disable vPMU support on hybrid CPUs
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
kvm: initialize all of the kvm_debugregs structure before sending it to userspace
perf/x86: Refuse to export capabilities for hybrid PMUs
KVM: x86/pmu: Disable vPMU support on hybrid CPUs (host PMUs)
Documentation/hw-vuln: Fix rST warning
- Fix 'perf' regression for non-standard CPU PMU hardware (i.e. Apple M1)
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 regression fix from Will Deacon:
"Apologies for the _extremely_ late pull request here, but we had a
'perf' (i.e. CPU PMU) regression on the Apple M1 reported on Wednesday
[1] which was introduced by bd27568117 ("perf: Rewrite core context
handling") during the merge window.
Mark and I looked into this and noticed an additional problem caused
by the same patch, where the 'CHAIN' event (used to combine two
adjacent 32-bit counters into a single 64-bit counter) was not being
filtered correctly. Mark posted a series on Thursday [2] which
addresses both of these regressions and I queued it the same day.
The changes are small, self-contained and have been confirmed to fix
the original regression.
Summary:
- Fix 'perf' regression for non-standard CPU PMU hardware (i.e. Apple
M1)"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: perf: reject CHAIN events at creation time
arm_pmu: fix event CPU filtering
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Merge tag 'block-6.2-2023-02-17' of git://git.kernel.dk/linux
Pull block fix from Jens Axboe:
"I guess this is what can happen when you prep things early for going
away, something else comes in last minute. This one fixes another
regression in 6.2 for NVMe, from this release, and hence we should
probably get it submitted for 6.2.
Still waiting for the original reporter (see bugzilla linked in the
commit) to test this, but Keith managed to setup and recreate the
issue and tested the patch that way"
* tag 'block-6.2-2023-02-17' of git://git.kernel.dk/linux:
nvme-pci: refresh visible attrs for cmb attributes
