powerpc64/bpf: support direct_call on livepatch function #6111
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Today, livepatch takes precedence over direct_call. Instead, save the state and make direct_call before handling livepatch. This change inadvertly skips livepatch stack restore, when an attached fmod_ret program fails. To handle this scenario, set cr0.eq bit to indicate livepatch is active while making the direct_call, save the expected livepatch stack state on the trampoline stack and restore it, if and when required, during do_fexit in the trampoline code. Reported-by: Shung-Hsi Yu <[email protected]> Closes: https://lore.kernel.org/all/rwmwrvvtg3pd7qrnt3of6dideioohwhsplancoc2gdrjran7bg@j5tqng6loymr/ Signed-off-by: Hari Bathini <[email protected]>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=1009299 irrelevant now. Closing PR. |
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Pull request for series with
subject: powerpc64/bpf: support direct_call on livepatch function
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1009299