Commit 21c9f5cc authored by Al Viro's avatar Al Viro
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p9_client_attach(): set fid->uid correctly

it's almost always equal to current_fsuid(), but there's an exception -
if the first writeback fid is opened by non-root *and* that happens before
root has done any lookups in /, we end up doing attach for root.  The
current code leaves the resulting FID owned by root from the server POV
and by non-root from the client one.  Unfortunately, it means that e.g.
massive dcache eviction will leave that user buggered - they'll end
up redoing walks from / *and* picking that FID every time.  As soon as
they try to create something, the things will get nasty.
Signed-off-by: default avatarAl Viro <>
parent ce85dd58
......@@ -1116,6 +1116,7 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
fid = NULL;
goto error;
fid->uid = n_uname;
req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
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