rpc: clean up decoding of gssproxy linux creds
We can use the normal coding infrastructure here. Two minor behavior changes: - we're assuming no wasted space at the end of the linux cred. That seems to match gss-proxy's behavior, and I can't see why it would need to do differently in the future. - NGROUPS_MAX check added: note groups_alloc doesn't do this, this is the caller's responsibility. Tested-by: Simo Sorce <simo@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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@ -166,14 +166,14 @@ static int dummy_dec_opt_array(struct xdr_stream *xdr,
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return 0;
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}
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static int get_s32(void **p, void *max, s32 *res)
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static int get_s32(struct xdr_stream *xdr, s32 *res)
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{
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void *base = *p;
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void *next = (void *)((char *)base + sizeof(s32));
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if (unlikely(next > max || next < base))
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__be32 *p;
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p = xdr_inline_decode(xdr, 4);
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if (!p)
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return -EINVAL;
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memcpy(res, base, sizeof(s32));
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*p = next;
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memcpy(res, p, sizeof(s32));
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return 0;
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}
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@ -182,7 +182,6 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
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{
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u32 length;
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__be32 *p;
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void *q, *end;
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s32 tmp;
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int N, i, err;
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@ -192,33 +191,28 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
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length = be32_to_cpup(p);
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/* FIXME: we do not want to use the scratch buffer for this one
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* may need to use functions that allows us to access an io vector
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* directly */
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p = xdr_inline_decode(xdr, length);
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if (unlikely(p == NULL))
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if (length > (3 + NGROUPS_MAX) * sizeof(u32))
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return -ENOSPC;
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q = p;
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end = q + length;
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/* uid */
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err = get_s32(&q, end, &tmp);
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err = get_s32(xdr, &tmp);
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if (err)
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return err;
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creds->cr_uid = make_kuid(&init_user_ns, tmp);
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/* gid */
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err = get_s32(&q, end, &tmp);
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err = get_s32(xdr, &tmp);
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if (err)
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return err;
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creds->cr_gid = make_kgid(&init_user_ns, tmp);
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/* number of additional gid's */
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err = get_s32(&q, end, &tmp);
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err = get_s32(xdr, &tmp);
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if (err)
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return err;
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N = tmp;
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if ((3 + N) * sizeof(u32) != length)
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return -EINVAL;
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creds->cr_group_info = groups_alloc(N);
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if (creds->cr_group_info == NULL)
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return -ENOMEM;
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@ -226,7 +220,7 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
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/* gid's */
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for (i = 0; i < N; i++) {
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kgid_t kgid;
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err = get_s32(&q, end, &tmp);
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err = get_s32(xdr, &tmp);
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if (err)
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goto out_free_groups;
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err = -EINVAL;
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