SUNRPC: add side channel to use non-generic cred for rpc call.

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The credential passed in rpc_message.rpc_cred is always a
generic credential except in one instance.
When gss_destroying_context() calls rpc_call_null(), it passes
a specific credential that it needs to destroy.
In this case the RPC acts *on* the credential rather than
being authorized by it.

This special case deserves explicit support and providing that will
mean that rpc_message.rpc_cred is *always* generic, allowing
some optimizations.

So add "tk_op_cred" to rpc_task and "rpc_op_cred" to the setup data.
Use this to pass the cred down from rpc_call_null(), and have
rpcauth_bindcred() notice it and bind it in place.

Credit to kernel test robot <fengguang.wu@intel.com> for finding
a bug in earlier version of this patch.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

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This commit is contained in:

NeilBrown 2018-12-03 11:30:30 +11:00 • committed by Anna Schumaker

parent a68a72e135

commit 1de7eea929

4 changed files with 11 additions and 2 deletions

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2

include/linux/sunrpc/sched.h

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6

net/sunrpc/auth.c

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2

net/sunrpc/clnt.c

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3

net/sunrpc/sched.c

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