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NFSD: Remove argument length checking in nfsd_dispatch()

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Now that the argument decoders for NFSv2 and NFSv3 use the
xdr_stream mechanism, the version-specific length checking logic in
nfsd_dispatch() is no longer necessary.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-10-20 10:08:19 -04:00
parent 09f75a5375
commit 5650682e16
1 changed files with 0 additions and 34 deletions
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34
fs/nfsd/nfssvc.c
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@ -955,37 +955,6 @@ nfsd(void *vrqstp)
return 0;
}
/*
* A write procedure can have a large argument, and a read procedure can
* have a large reply, but no NFSv2 or NFSv3 procedure has argument and
* reply that can both be larger than a page. The xdr code has taken
* advantage of this assumption to be a sloppy about bounds checking in
* some cases. Pending a rewrite of the NFSv2/v3 xdr code to fix that
* problem, we enforce these assumptions here:
*/
static bool nfs_request_too_big(struct svc_rqst *rqstp,
const struct svc_procedure *proc)
{
/*
* The ACL code has more careful bounds-checking and is not
* susceptible to this problem:
*/
if (rqstp->rq_prog != NFS_PROGRAM)
return false;
/*
* Ditto NFSv4 (which can in theory have argument and reply both
* more than a page):
*/
if (rqstp->rq_vers >= 4)
return false;
/* The reply will be small, we're OK: */
if (proc->pc_xdrressize > 0 &&
proc->pc_xdrressize < XDR_QUADLEN(PAGE_SIZE))
return false;
return rqstp->rq_arg.len > PAGE_SIZE;
}
/**
* nfsd_dispatch - Process an NFS or NFSACL Request
* @rqstp: incoming request
@ -1004,9 +973,6 @@ int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
struct kvec *resv = &rqstp->rq_res.head[0];
__be32 *p;
if (nfs_request_too_big(rqstp, proc))
goto out_decode_err;
/*
* Give the xdr decoder a chance to change this if it wants
* (necessary in the NFSv4.0 compound case)