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To support sigreturn with CET enabled parasite must rewind its stack before calling sigreturn so that shadow stack will be compatible with actual calling sequence. In addition, calling sigreturn from top level routine (__export_parasite_head_start) will significantly simplify the shadow stack manipulations required to execute sigreturn. For x86 make fini_sigreturn() return the stack pointer for the signal frame that will be used by sigreturn and propagate that return value up to __export_parasite_head_start. In non-daemon mode parasite_trap_cmd() returns non-positive value which allows to distinguish daemon and non-daemon mode and properly stop at int3 in non-daemon mode. Architectures other than x86 remain unchanged and will still call sigreturn from fini_sigreturn(). Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org> |
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