Blame view
samples/seccomp/bpf-fancy.c
2.48 KB
b24413180
License cleanup: ...
|
1 |
// SPDX-License-Identifier: GPL-2.0 |
8ac270d1e
Documentation: pr...
|
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 |
/*
* Seccomp BPF example using a macro-based generator.
*
* Copyright (c) 2012 The Chromium OS Authors <chromium-os-dev@chromium.org>
* Author: Will Drewry <wad@chromium.org>
*
* The code may be used by anyone for any purpose,
* and can serve as a starting point for developing
* applications using prctl(PR_ATTACH_SECCOMP_FILTER).
*/
#include <linux/filter.h>
#include <linux/seccomp.h>
#include <linux/unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/prctl.h>
#include <unistd.h>
#include "bpf-helper.h"
#ifndef PR_SET_NO_NEW_PRIVS
#define PR_SET_NO_NEW_PRIVS 38
#endif
int main(int argc, char **argv)
{
|
3a9af0bd3
samples/seccomp: ...
|
29 30 31 |
struct bpf_labels l = {
.count = 0,
};
|
|
8ac270d1e
Documentation: pr...
|
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 |
static const char msg1[] = "Please type something: ";
static const char msg2[] = "You typed: ";
char buf[256];
struct sock_filter filter[] = {
/* TODO: LOAD_SYSCALL_NR(arch) and enforce an arch */
LOAD_SYSCALL_NR,
SYSCALL(__NR_exit, ALLOW),
SYSCALL(__NR_exit_group, ALLOW),
SYSCALL(__NR_write, JUMP(&l, write_fd)),
SYSCALL(__NR_read, JUMP(&l, read)),
DENY, /* Don't passthrough into a label */
LABEL(&l, read),
ARG(0),
JNE(STDIN_FILENO, DENY),
ARG(1),
JNE((unsigned long)buf, DENY),
ARG(2),
JGE(sizeof(buf), DENY),
ALLOW,
LABEL(&l, write_fd),
ARG(0),
JEQ(STDOUT_FILENO, JUMP(&l, write_buf)),
JEQ(STDERR_FILENO, JUMP(&l, write_buf)),
DENY,
LABEL(&l, write_buf),
ARG(1),
JEQ((unsigned long)msg1, JUMP(&l, msg1_len)),
JEQ((unsigned long)msg2, JUMP(&l, msg2_len)),
JEQ((unsigned long)buf, JUMP(&l, buf_len)),
DENY,
LABEL(&l, msg1_len),
ARG(2),
JLT(sizeof(msg1), ALLOW),
DENY,
LABEL(&l, msg2_len),
ARG(2),
JLT(sizeof(msg2), ALLOW),
DENY,
LABEL(&l, buf_len),
ARG(2),
JLT(sizeof(buf), ALLOW),
DENY,
};
struct sock_fprog prog = {
.filter = filter,
.len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
};
ssize_t bytes;
bpf_resolve_jumps(&l, filter, sizeof(filter)/sizeof(*filter));
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
perror("prctl(NO_NEW_PRIVS)");
return 1;
}
if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog)) {
perror("prctl(SECCOMP)");
return 1;
}
syscall(__NR_write, STDOUT_FILENO, msg1, strlen(msg1));
bytes = syscall(__NR_read, STDIN_FILENO, buf, sizeof(buf)-1);
bytes = (bytes > 0 ? bytes : 0);
syscall(__NR_write, STDERR_FILENO, msg2, strlen(msg2));
syscall(__NR_write, STDERR_FILENO, buf, bytes);
/* Now get killed */
syscall(__NR_write, STDERR_FILENO, msg2, strlen(msg2)+2);
return 0;
}
|