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authorJeff Layton <jlayton@redhat.com>2010-01-07 09:42:02 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-02-10 08:30:50 -0500
commitdc5ddce956660247e004a4b20a26b7d137ab1644 (patch)
tree8e067bfb6f1fc84adf76a9370e35fbad77dd4636 /net/sunrpc
parentac73fddfc523bf3c3525d16356b44527c44fae6d (diff)
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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>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/auth_gss/auth_gss.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index f7a7f83..0cfccc2a 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -206,8 +206,14 @@ gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct
ctx->gc_win = window_size;
/* gssd signals an error by passing ctx->gc_win = 0: */
if (ctx->gc_win == 0) {
- /* in which case, p points to an error code which we ignore */
- p = ERR_PTR(-EACCES);
+ /*
+ * in which case, p points to an error code. Anything other
+ * than -EKEYEXPIRED gets converted to -EACCES.
+ */
+ p = simple_get_bytes(p, end, &ret, sizeof(ret));
+ if (!IS_ERR(p))
+ p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
+ ERR_PTR(-EACCES);
goto err;
}
/* copy the opaque wire context */
@@ -646,6 +652,7 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
err = PTR_ERR(p);
switch (err) {
case -EACCES:
+ case -EKEYEXPIRED:
gss_msg->msg.errno = err;
err = mlen;
break;