| 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 | } |