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seccomp

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This commit is contained in:
Victor Tabary 2024-06-26 14:55:47 +02:00
parent 93e87998b2
commit 4032410f2a
1 changed files with 47 additions and 2 deletions
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47
src/luajit.c
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@ -10,6 +10,13 @@
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <sys/prctl.h>
#include <sys/fcntl.h>
#include <linux/seccomp.h>
#include <linux/filter.h>
#include <linux/audit.h>
#include <sys/syscall.h>
#define luajit_c #define luajit_c
#include "lua.h" #include "lua.h"
@ -566,6 +573,43 @@ static int pmain(lua_State *L)
return 0; return 0;
} }
int init_seccomp()
{
#define ALLOW(NR) \
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, (NR), 0, 1), \
BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ALLOW) \
struct sock_filter filter[] = {
BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(struct seccomp_data, arch)),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, AUDIT_ARCH_X86_64, 1, 0),
BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_KILL),
BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(struct seccomp_data, nr)),
ALLOW(SYS_read),
ALLOW(SYS_write),
ALLOW(SYS_mmap),
ALLOW(SYS_mprotect),
ALLOW(SYS_rt_sigaction),
ALLOW(SYS_close),
ALLOW(SYS_getrandom),
ALLOW(SYS_brk),
//ALLOW(SYS_openat),
ALLOW(SYS_newfstatat),
ALLOW(SYS_ioctl),
ALLOW(SYS_futex),
BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_KILL),
};
#undef ALLOW
struct sock_fprog prog = {
.len = sizeof(filter) / sizeof(*filter),
.filter = filter,
};
return prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) || prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
}
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
int status; int status;
@ -578,9 +622,10 @@ int main(int argc, char **argv)
} }
smain.argc = argc; smain.argc = argc;
smain.argv = argv; smain.argv = argv;
init_seccomp();
status = lua_cpcall(L, pmain, NULL); status = lua_cpcall(L, pmain, NULL);
report(L, status); report(L, status);
lua_close(L); lua_close(L);
return (status || smain.status > 0) ? EXIT_FAILURE : EXIT_SUCCESS; return (status || smain.status > 0) ? EXIT_FAILURE : EXIT_SUCCESS;
} }