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01bd794d MJ |
1 | // SPDX-License-Identifier: MIT |
2 | // SPDX-FileCopyrightText: 2024 Michael Jeanson <mjeanson@efficios.com> | |
3 | ||
4 | #include <errno.h> | |
5 | #include <seccomp.h> | |
6 | ||
7 | /* | |
8 | * Library constructor. | |
9 | * | |
10 | * Apply a seccomp policy that blocks access to the rseq syscall and returns | |
11 | * ENOSYS. | |
12 | */ | |
13 | static __attribute__((constructor)) | |
14 | void disable_rseq_syscall(void) | |
15 | { | |
16 | scmp_filter_ctx ctx; | |
17 | ||
18 | ctx = seccomp_init(SCMP_ACT_ALLOW); | |
19 | seccomp_rule_add(ctx, SCMP_ACT_ERRNO(ENOSYS), SCMP_SYS(rseq), 0); | |
20 | seccomp_load(ctx); | |
21 | } |