fs: completely ignore unknown open flags
commit 629e014bb8
upstream.
Currently we just stash anything we got into file->f_flags, and the
report it in fcntl(F_GETFD). This patch just clears out all unknown
flags so that we don't pass them to the fs or report them.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
6efb1b0b6c
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26ff065b84
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@ -902,6 +902,12 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
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int lookup_flags = 0;
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int acc_mode = ACC_MODE(flags);
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/*
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* Clear out all open flags we don't know about so that we don't report
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* them in fcntl(F_GETFD) or similar interfaces.
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*/
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flags &= VALID_OPEN_FLAGS;
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if (flags & (O_CREAT | __O_TMPFILE))
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op->mode = (mode & S_IALLUGO) | S_IFREG;
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else
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