diff options
author | Marc Zyngier | 2020-08-19 17:12:17 +0100 |
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committer | Al Viro | 2020-08-22 18:23:57 -0400 |
commit | a9ed4a6560b8562b7e2e2bed9527e88001f7b682 (patch) | |
tree | 0769da3ad923b7c84ce4eb86fd2bc3e9fde6efe6 /tools/perf/util/pstack.h | |
parent | 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5 (diff) |
epoll: Keep a reference on files added to the check list
When adding a new fd to an epoll, and that this new fd is an
epoll fd itself, we recursively scan the fds attached to it
to detect cycles, and add non-epool files to a "check list"
that gets subsequently parsed.
However, this check list isn't completely safe when deletions
can happen concurrently. To sidestep the issue, make sure that
a struct file placed on the check list sees its f_count increased,
ensuring that a concurrent deletion won't result in the file
disapearing from under our feet.
Cc: stable@vger.kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'tools/perf/util/pstack.h')
0 files changed, 0 insertions, 0 deletions