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authorAl Viro <viro@zeniv.linux.org.uk>2008-05-08 21:19:42 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2008-05-16 17:22:46 -0400
commitadbecb128cd2cc5d14b0ebef6d020ced0efd0ec6 (patch)
treeba0f7c202e364002eedc999526ac07262f21dae4 /kernel/sysctl.c
parentafbec7fff4928c273a1f1bb14dfdfdf62688a193 (diff)
[PATCH] dup_fd() part 4 - race fix
Parent _can_ be a clone task, contrary to the comment. Moreover, more files could be opened while we allocate a copy, in which case we end up copying only part into new descriptor table. Since what we get _is_ affected by all changes in the old range, we can get rather weird effects - e.g. dup2(0, 1024); close(0); in parallel with fork() resulting in child that sees the effect of close(), but not that of dup2() done just before that close(). What we need is to recalculate the open_count after having reacquired ->file_lock and if external fdtable we'd just allocated is too small for it, free the sucker and redo allocation. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel/sysctl.c')
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