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Merge 37386b857a into 7c66041a6f

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cpunk 2024-10-12 16:53:08 +02:00 committed by GitHub
commit 1f5ac83c03
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1 changed files with 22 additions and 1 deletions
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23
src/sandbox/seccomp.cpp
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@ -54,7 +54,7 @@
BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ERRNO|(_errno)) BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ERRNO|(_errno))
#define KILL_PROCESS \ #define KILL_PROCESS \
BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL_PROCESS) BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_TRAP)
/* /*
* Macros adapted from openssh's sandbox-seccomp-filter.c * Macros adapted from openssh's sandbox-seccomp-filter.c
@ -302,6 +302,18 @@ int seccomp(unsigned int operation, unsigned int flags, void *args) {
return syscall(__NR_seccomp, operation, flags, args); return syscall(__NR_seccomp, operation, flags, args);
} }
void sig_sys_handler(int signo, siginfo_t *info, void *context)
{
// report the unhandled syscall
std::cout << "[FATAL] Unhandled syscall: " << info->si_syscall << std::endl;
std::cout << "If you're unsure why this is happening, please read https://openfusion.dev/docs/development/the-sandbox/" << std::endl
<< "for more information and possibly open an issue at https://github.com/OpenFusionProject/OpenFusion/issues to report"
<< " needed changes in our seccomp filter." << std::endl;
exit(1);
}
void sandbox_start() { void sandbox_start() {
if (!settings::SANDBOX) { if (!settings::SANDBOX) {
std::cout << "[WARN] Running without a sandbox" << std::endl; std::cout << "[WARN] Running without a sandbox" << std::endl;
@ -310,6 +322,15 @@ void sandbox_start() {
std::cout << "[INFO] Starting seccomp-bpf sandbox..." << std::endl; std::cout << "[INFO] Starting seccomp-bpf sandbox..." << std::endl;
// we listen to SIGSYS to report unhandled syscalls
struct sigaction sa = {};
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = sig_sys_handler;
if (sigaction(SIGSYS, &sa, NULL) < 0) {
perror("sigaction");
exit(1);
}
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) { if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
perror("prctl"); perror("prctl");
exit(1); exit(1);