diff options
| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2021-04-01 14:03:26 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2021-04-14 09:36:29 -0400 |
| commit | eb3d58c68e39fad68d8054e0324eb06d82dcedbb (patch) | |
| tree | bebaae6d3ad6fad610fc1ac0e1662327f39ca823 /fs/nfs | |
| parent | 3d66bae156a652be18e278f3c88bc3e069ae824b (diff) | |
NFSv4: Catch and trace server filehandle encoding errors
If the server returns a filehandle with an invalid length, then trace
that, and return an EREMOTEIO error.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/nfs3xdr.c | 4 | ||||
| -rw-r--r-- | fs/nfs/nfs4trace.h | 1 | ||||
| -rw-r--r-- | fs/nfs/nfs4xdr.c | 13 | ||||
| -rw-r--r-- | fs/nfs/nfstrace.c | 1 | ||||
| -rw-r--r-- | fs/nfs/nfstrace.h | 1 |
5 files changed, 14 insertions, 6 deletions
diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c index 83ad62c81fc7..e6eca1d7481b 100644 --- a/fs/nfs/nfs3xdr.c +++ b/fs/nfs/nfs3xdr.c @@ -433,7 +433,7 @@ static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh) if (unlikely(!p)) return -EIO; length = be32_to_cpup(p++); - if (unlikely(length > NFS3_FHSIZE)) + if (unlikely(length > NFS3_FHSIZE || length == 0)) goto out_toobig; p = xdr_inline_decode(xdr, length); if (unlikely(!p)) @@ -442,7 +442,7 @@ static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh) memcpy(fh->data, p, length); return 0; out_toobig: - dprintk("NFS: file handle size (%u) too big\n", length); + trace_nfs_xdr_bad_filehandle(xdr, NFSERR_BADHANDLE); return -E2BIG; } diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h index 114983a706e9..2ef75caad6da 100644 --- a/fs/nfs/nfs4trace.h +++ b/fs/nfs/nfs4trace.h @@ -745,6 +745,7 @@ DECLARE_EVENT_CLASS(nfs4_xdr_event, ), \ TP_ARGS(xdr, op, error)) DEFINE_NFS4_XDR_EVENT(nfs4_xdr_status); +DEFINE_NFS4_XDR_EVENT(nfs4_xdr_bad_filehandle); DECLARE_EVENT_CLASS(nfs4_cb_error_class, TP_PROTO( diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index ee7a7a132acc..3d7e10c26597 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -3495,8 +3495,11 @@ static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, stru if (unlikely(!p)) return -EIO; len = be32_to_cpup(p); - if (len > NFS4_FHSIZE) - return -EIO; + if (len > NFS4_FHSIZE || len == 0) { + trace_nfs4_xdr_bad_filehandle(xdr, OP_READDIR, + NFS4ERR_BADHANDLE); + return -EREMOTEIO; + } p = xdr_inline_decode(xdr, len); if (unlikely(!p)) return -EIO; @@ -4952,8 +4955,10 @@ static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh) if (unlikely(!p)) return -EIO; len = be32_to_cpup(p); - if (len > NFS4_FHSIZE) - return -EIO; + if (len > NFS4_FHSIZE || len == 0) { + trace_nfs4_xdr_bad_filehandle(xdr, OP_GETFH, NFS4ERR_BADHANDLE); + return -EREMOTEIO; + } fh->size = len; p = xdr_inline_decode(xdr, len); if (unlikely(!p)) diff --git a/fs/nfs/nfstrace.c b/fs/nfs/nfstrace.c index a90b363500c2..5d1bfccbb4da 100644 --- a/fs/nfs/nfstrace.c +++ b/fs/nfs/nfstrace.c @@ -12,3 +12,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(nfs_fsync_enter); EXPORT_TRACEPOINT_SYMBOL_GPL(nfs_fsync_exit); EXPORT_TRACEPOINT_SYMBOL_GPL(nfs_xdr_status); +EXPORT_TRACEPOINT_SYMBOL_GPL(nfs_xdr_bad_filehandle); diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h index 45eda4db42fd..eb1ef3462e84 100644 --- a/fs/nfs/nfstrace.h +++ b/fs/nfs/nfstrace.h @@ -1451,6 +1451,7 @@ DECLARE_EVENT_CLASS(nfs_xdr_event, ), \ TP_ARGS(xdr, error)) DEFINE_NFS_XDR_EVENT(nfs_xdr_status); +DEFINE_NFS_XDR_EVENT(nfs_xdr_bad_filehandle); #endif /* _TRACE_NFS_H */ |