sunrpc: parse and return errors reported by gssd
The kernel currently ignores any error code sent by gssd and always considers it to be -EACCES. In order to better handle the situation of an expired KRB5 TGT, the kernel needs to be able to parse and deal with the errors that gssd sends. Aside from -EACCES the only error we care about is -EKEYEXPIRED, which we're using to indicate that the upper layers should retry the call a little later. To maintain backward compatibility with older gssd's, any error other than -EKEYEXPIRED is interpreted as -EACCES. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -206,8 +206,14 @@ gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct
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ctx->gc_win = window_size;
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/* gssd signals an error by passing ctx->gc_win = 0: */
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if (ctx->gc_win == 0) {
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/* in which case, p points to an error code which we ignore */
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p = ERR_PTR(-EACCES);
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/*
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* in which case, p points to an error code. Anything other
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* than -EKEYEXPIRED gets converted to -EACCES.
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*/
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p = simple_get_bytes(p, end, &ret, sizeof(ret));
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if (!IS_ERR(p))
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p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
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ERR_PTR(-EACCES);
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goto err;
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}
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/* copy the opaque wire context */
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@ -646,6 +652,7 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
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err = PTR_ERR(p);
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switch (err) {
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case -EACCES:
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case -EKEYEXPIRED:
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gss_msg->msg.errno = err;
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err = mlen;
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break;
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