linux/samples/seccomp/bpf-fancy.c

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Documentation: prctl/seccomp_filter Documents how system call filtering using Berkeley Packet Filter programs works and how it may be used. Includes an example for x86 and a semi-generic example using a macro-based code generator. Acked-by: Eric Paris <eparis@redhat.com> Signed-off-by: Will Drewry <wad@chromium.org> Acked-by: Kees Cook <keescook@chromium.org> v18: - added acked by - update no new privs numbers v17: - remove @compat note and add Pitfalls section for arch checking (keescook@chromium.org) v16: - v15: - v14: - rebase/nochanges v13: - rebase on to 88ebdda6159ffc15699f204c33feb3e431bf9bdc v12: - comment on the ptrace_event use - update arch support comment - note the behavior of SECCOMP_RET_DATA when there are multiple filters (keescook@chromium.org) - lots of samples/ clean up incl 64-bit bpf-direct support (markus@chromium.org) - rebase to linux-next v11: - overhaul return value language, updates (keescook@chromium.org) - comment on do_exit(SIGSYS) v10: - update for SIGSYS - update for new seccomp_data layout - update for ptrace option use v9: - updated bpf-direct.c for SIGILL v8: - add PR_SET_NO_NEW_PRIVS to the samples. v7: - updated for all the new stuff in v7: TRAP, TRACE - only talk about PR_SET_SECCOMP now - fixed bad JLE32 check (coreyb@linux.vnet.ibm.com) - adds dropper.c: a simple system call disabler v6: - tweak the language to note the requirement of PR_SET_NO_NEW_PRIVS being called prior to use. (luto@mit.edu) v5: - update sample to use system call arguments - adds a "fancy" example using a macro-based generator - cleaned up bpf in the sample - update docs to mention arguments - fix prctl value (eparis@redhat.com) - language cleanup (rdunlap@xenotime.net) v4: - update for no_new_privs use - minor tweaks v3: - call out BPF <-> Berkeley Packet Filter (rdunlap@xenotime.net) - document use of tentative always-unprivileged - guard sample compilation for i386 and x86_64 v2: - move code to samples (corbet@lwn.net) Signed-off-by: James Morris <james.l.morris@oracle.com>
2012-04-12 21:48:04 +00:00
/*
* 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)
{
struct bpf_labels l;
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;
}