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seccomp: move arch_prctl to @default - #22039
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It was reported as used by the linker: > [It is] called in the setup of ld-linux-x86-64.so.2 from _dl_sysdep_start. > My local call stack (with LTO): > > #0 init_cpu_features.constprop.0 (/usr/lib64/ld-linux-x86-64.so.2) > #1 _dl_sysdep_start (/usr/lib64/ld-linux-x86-64.so.2) > #2 _dl_start (/usr/lib64/ld-linux-x86-64.so.2) > #3 _start (/usr/lib64/ld-linux-x86-64.so.2) > > Looking through the source, I think it's this (links for glibc 2.34): > - First dl_platform_init calls _dl_x86_init_cpu_features, a wrapper for init_cpu_features. > - Then init_cpu_features calls get_cet_status. > - At last, get_cet_status invokes arch_prctl. Fixes systemd#22033.
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It was reported as used by the linker:
Fixes #22033.