From d08f6ff204c8525f7533875128468afb8be60ae0 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= Date: Fri, 7 Jan 2022 15:23:55 +0100 Subject: [PATCH] seccomp: move arch_prctl to @default 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 #22033. (cherry picked from commit 5f02870a74aa3a758115cc9bd6d68f239caf8453) --- src/shared/seccomp-util.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/shared/seccomp-util.c b/src/shared/seccomp-util.c index b70ad1f7ea..32bd8aa73b 100644 --- a/src/shared/seccomp-util.c +++ b/src/shared/seccomp-util.c @@ -286,6 +286,7 @@ const SyscallFilterSet syscall_filter_sets[_SYSCALL_FILTER_SET_MAX] = { .name = "@default", .help = "System calls that are always permitted", .value = + "arch_prctl\0" /* Used during platform-specific initialization by ld-linux.so. */ "brk\0" "cacheflush\0" "clock_getres\0" @@ -715,7 +716,6 @@ const SyscallFilterSet syscall_filter_sets[_SYSCALL_FILTER_SET_MAX] = { .name = "@process", .help = "Process control, execution, namespacing operations", .value = - "arch_prctl\0" "capget\0" /* Able to query arbitrary processes */ "clone\0" "clone3\0" -- 2.25.1