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| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2014-08-25 22:33:12 -0400 |
|---|---|---|
| committer | Zefan Li <lizefan@huawei.com> | 2014-09-25 11:49:15 +0800 |
| commit | 0bfb000447ffec4e7245c9c761fd0770acba504d (patch) | |
| tree | 2bb3296fa8b61bd47b85387aea3f20cb097e8db2 | |
| parent | 818ee415d57c89ab36cbd2b9a57cc3c257afc1b9 (diff) | |
| download | lwn-0bfb000447ffec4e7245c9c761fd0770acba504d.tar.gz lwn-0bfb000447ffec4e7245c9c761fd0770acba504d.zip | |
NFSv4: Fix problems with close in the presence of a delegation
commit aee7af356e151494d5014f57b33460b162f181b5 upstream.
In the presence of delegations, we can no longer assume that the
state->n_rdwr, state->n_rdonly, state->n_wronly reflect the open
stateid share mode, and so we need to calculate the initial value
for calldata->arg.fmode using the state->flags.
Reported-by: James Drews <drews@engr.wisc.edu>
Fixes: 88069f77e1ac5 (NFSv41: Fix a potential state leakage when...)
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
[lizf: Backport to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@huawei.com>
| -rw-r--r-- | fs/nfs/nfs4proc.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 934bb1ca8335..01afcd575920 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -2051,6 +2051,7 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data) { struct nfs4_closedata *calldata = data; struct nfs4_state *state = calldata->state; + bool is_rdonly, is_wronly, is_rdwr; int call_close = 0; dprintk("%s: begin!\n", __func__); @@ -2058,18 +2059,24 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data) return; task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; - calldata->arg.fmode = FMODE_READ|FMODE_WRITE; spin_lock(&state->owner->so_lock); + is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); + is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); + is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); + /* Calculate the current open share mode */ + calldata->arg.fmode = 0; + if (is_rdonly || is_rdwr) + calldata->arg.fmode |= FMODE_READ; + if (is_wronly || is_rdwr) + calldata->arg.fmode |= FMODE_WRITE; /* Calculate the change in open mode */ if (state->n_rdwr == 0) { if (state->n_rdonly == 0) { - call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); - call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); + call_close |= is_rdonly || is_rdwr; calldata->arg.fmode &= ~FMODE_READ; } if (state->n_wronly == 0) { - call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); - call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); + call_close |= is_wronly || is_rdwr; calldata->arg.fmode &= ~FMODE_WRITE; } } |