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NFSD: Clamp WRITE offsets

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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>
This commit is contained in:
Chuck Lever 2022-01-25 16:36:22 -05:00
parent a648fdeb7c
commit 6260d9a56a
2 changed files with 8 additions and 2 deletions
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5
fs/nfsd/nfs3proc.c
View File

@ -203,6 +203,11 @@ 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, &argp->payload);

5
fs/nfsd/nfs4proc.c
View File

@ -1022,8 +1022,9 @@ 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,