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| author | Al Viro <viro@zeniv.linux.org.uk> | 2010-06-07 05:49:18 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2010-08-09 22:48:15 +0200 |
| commit | f8ad850f11e11d10e7de1a16ca53cb193afc9313 (patch) | |
| tree | 4812193c6be29f41d3de3ae74705e95a9566546c /Documentation/serial | |
| parent | leak in hostfs_unlink() (diff) | |
| download | linux-f8ad850f11e11d10e7de1a16ca53cb193afc9313.tar.xz linux-f8ad850f11e11d10e7de1a16ca53cb193afc9313.zip | |
try to get rid of races in hostfs open()
In case of mode mismatch, do *not* blindly close the descriptor
another openers might be using right now. Open the underlying
file with currently sufficient mode, then
* if current mode has grown so that it's sufficient for
us now, just close our new fd
* if current mode has grown and our fd is *not* enough
to cover it, close and repeat.
* otherwise, install our fd if the file hadn't been
opened at all or dup2() our fd over the current one (and close
our fd).
Critical section is protected by mutex; yes, system-wide. All
we do under it is a bunch of comparison and maybe an overwriting
dup2() on host.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'Documentation/serial')
0 files changed, 0 insertions, 0 deletions