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authorAl Viro <viro@zeniv.linux.org.uk>2016-06-07 21:26:55 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2016-06-07 21:26:55 -0400
commit3d56c25e3bb0726a5c5e16fc2d9e38f8ed763085 (patch)
tree3b76a5c52293cc900bd55a839831939a4ac47d44 /fs/coredump.c
parente6ec03a25f12b312b7e0c037fe4a6471c4ee5665 (diff)
fix d_walk()/non-delayed __d_free() race
Ascend-to-parent logics in d_walk() depends on all encountered child dentries not getting freed without an RCU delay. Unfortunately, in quite a few cases it is not true, with hard-to-hit oopsable race as the result. Fortunately, the fix is simiple; right now the rule is "if it ever been hashed, freeing must be delayed" and changing it to "if it ever had a parent, freeing must be delayed" closes that hole and covers all cases the old rule used to cover. Moreover, pipes and sockets remain _not_ covered, so we do not introduce RCU delay in the cases which are the reason for having that delay conditional in the first place. Cc: stable@vger.kernel.org # v3.2+ (and watch out for __d_materialise_dentry()) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/coredump.c')
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