** Tags added: bjf-tracking
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https://bugs.launchpad.net/bugs/1815259
Title:
BPF: kernel pointer leak to unprivileged userspace
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
In Progress
Bug description:
[Impact]
Per Jann Horn, "Upstream commit dd066823db2ac4e22f721ec85190817b58059a54
("bpf/verifier: disallow pointer subtraction") fixes a security bug
(kernel pointer leak to unprivileged userspace)."
https://lore.kernel.org/netdev/CAG48ez1=zogmdsue38hkg73ea4en+5qotltmzme+pgcthhw...@mail.gmail.com/
[Test Case]
Run the "check subtraction on pointers for unpriv" test from
tools/testing/selftests/bpf/test_verifier.c. The test should pass if
the bug is fixed, fail otherwise.
[Regression Potential]
The change could cause a regression in an unprivileged process that is
using eBPF. I suspect that this is unlikely. The alternative is to
leave a potential security hole open.
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