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Currently the application with enabled shadow stack will crash
if it sets up return uprobe. The reason is the uretprobe kernel
code changes the user space task's stack, but does not update
shadow stack accordingly.
Adding new functions to update values on shadow stack and using
them in uprobe code to keep shadow stack in sync with uretprobe
changes to user stack.
Link: https://lore.kernel.org/all/20240611112158.40795-2-jolsa@kernel.org/
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Fixes: 488af8ea7131 ("x86/shstk: Wire in shadow stack interface")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
1713b63a07