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author | Eric W. Biederman <ebiederm@xmission.com> | 2019-05-15 22:54:56 -0500 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-26 09:11:01 +0200 |
commit | 2f0e9eed11ca778d0ec5507a739c28472fd4ca20 (patch) | |
tree | cf69bc7355826cf2d237c15cbcac92ad80a48688 /kernel/memremap.c | |
parent | 1852befc685e413a7f86a4fc2b8666e7533b6660 (diff) | |
download | linux-stable-2f0e9eed11ca778d0ec5507a739c28472fd4ca20.tar.gz linux-stable-2f0e9eed11ca778d0ec5507a739c28472fd4ca20.tar.bz2 linux-stable-2f0e9eed11ca778d0ec5507a739c28472fd4ca20.zip |
signal: Correct namespace fixups of si_pid and si_uid
commit 7a0cf094944e2540758b7f957eb6846d5126f535 upstream.
The function send_signal was split from __send_signal so that it would
be possible to bypass the namespace logic based upon current[1]. As it
turns out the si_pid and the si_uid fixup are both inappropriate in
the case of kill_pid_usb_asyncio so move that logic into send_signal.
It is difficult to arrange but possible for a signal with an si_code
of SI_TIMER or SI_SIGIO to be sent across namespace boundaries. In
which case tests for when it is ok to change si_pid and si_uid based
on SI_FROMUSER are incorrect. Replace the use of SI_FROMUSER with a
new test has_si_pid_and_used based on siginfo_layout.
Now that the uid fixup is no longer present after expanding
SEND_SIG_NOINFO properly calculate the si_uid that the target
task needs to read.
[1] 7978b567d315 ("signals: add from_ancestor_ns parameter to send_signal()")
Cc: stable@vger.kernel.org
Fixes: 6588c1e3ff01 ("signals: SI_USER: Masquerade si_pid when crossing pid ns boundary")
Fixes: 6b550f949594 ("user namespace: make signal.c respect user namespaces")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/memremap.c')
0 files changed, 0 insertions, 0 deletions