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| author | Al Viro <viro@zeniv.linux.org.uk> | 2015-04-03 04:47:49 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-04-12 05:28:28 +0300 |
| commit | 21c9f5ccb103868c730aec6f8548e144ec397fed (patch) | |
| tree | d82387bd64ae1e98c40ad2f244d1584ec5c4f47f | |
| parent | ce85dd58ad5a6c209bb6e7413997b87b667db7ad (diff) | |
| download | linux-21c9f5ccb103868c730aec6f8548e144ec397fed.tar.xz | |
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: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | net/9p/client.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/9p/client.c b/net/9p/client.c index 18583bb89db6..6f4c4c88db84 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -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); |