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| author | Chuck Lever <chuck.lever@oracle.com> | 2022-01-26 00:36:22 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-16 14:56:06 +0300 |
| commit | 01c3ae81eef4d4f718bd946c11451c9f12bff68d (patch) | |
| tree | ef5896cc8e445cdeeef9023be72e21e85b938d83 /fs | |
| parent | 8e0ecaf7a7e57b30284d6b3289cc436100fadc48 (diff) | |
| download | linux-01c3ae81eef4d4f718bd946c11451c9f12bff68d.tar.xz | |
NFSD: Clamp WRITE offsets
commit 6260d9a56ab352b54891ec66ab0eced57d55abc6 upstream.
Ensure that a client cannot specify a WRITE range that falls in a
byte range outside what the kernel's internal types (such as loff_t,
which is signed) can represent. The kiocb iterators, invoked in
nfsd_vfs_write(), should properly limit write operations to within
the underlying file system's s_maxbytes.
Cc: stable@vger.kernel.org
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfsd/nfs3proc.c | 5 | ||||
| -rw-r--r-- | fs/nfsd/nfs4proc.c | 5 |
2 files changed, 8 insertions, 2 deletions
diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c index a0ccba636bf9..f99fc156c5bd 100644 --- a/fs/nfsd/nfs3proc.c +++ b/fs/nfsd/nfs3proc.c @@ -199,6 +199,11 @@ nfsd3_proc_write(struct svc_rqst *rqstp) (unsigned long long) argp->offset, argp->stable? " stable" : ""); + resp->status = nfserr_fbig; + if (argp->offset > (u64)OFFSET_MAX || + argp->offset + argp->len > (u64)OFFSET_MAX) + return rpc_success; + fh_copy(&resp->fh, &argp->fh); resp->committed = argp->stable; nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages, diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 486c5dba4b65..7d3e82db01c1 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1018,8 +1018,9 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, unsigned long cnt; int nvecs; - if (write->wr_offset >= OFFSET_MAX) - return nfserr_inval; + if (write->wr_offset > (u64)OFFSET_MAX || + write->wr_offset + write->wr_buflen > (u64)OFFSET_MAX) + return nfserr_fbig; cnt = write->wr_buflen; trace_nfsd_write_start(rqstp, &cstate->current_fh, |