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When calling sigreturn with CET enabled, the kernel verifies that the shadow stack has proper address of sa_restorer and a "restore token". Normally, they pushed to the shadow stack when signal processing is started. Since compel calls sigreturn directly, the shadow stack should be updated to match the kernel expectations for sigreturn invocation. Add parasite_setup_shstk() that sets up the shadow stack with the address of __export_parasite_head_start as sa_restorer and with the required restore token. Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org> |
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