5bacd7805a
kprobe example that demonstrates how future seccomp programs may look like.
It attaches to seccomp_phase1() function and tail-calls other BPF programs
depending on syscall number.
Existing optimized classic BPF seccomp programs generated by Chrome look like:
if (sd.nr < 121) {
if (sd.nr < 57) {
if (sd.nr < 22) {
if (sd.nr < 7) {
if (sd.nr < 4) {
if (sd.nr < 1) {
check sys_read
} else {
if (sd.nr < 3) {
check sys_write and sys_open
} else {
check sys_close
}
}
} else {
} else {
} else {
} else {
} else {
}
the future seccomp using native eBPF may look like:
bpf_tail_call(&sd, &syscall_jmp_table, sd.nr);
which is simpler, faster and leaves more room for per-syscall checks.
Usage:
$ sudo ./tracex5
<...>-366 [001] d... 4.870033: : read(fd=1, buf=00007f6d5bebf000, size=771)
<...>-369 [003] d... 4.870066: : mmap
<...>-369 [003] d... 4.870077: : syscall=110 (one of get/set uid/pid/gid)
<...>-369 [003] d... 4.870089: : syscall=107 (one of get/set uid/pid/gid)
sh-369 [000] d... 4.891740: : read(fd=0, buf=00000000023d1000, size=512)
sh-369 [000] d... 4.891747: : write(fd=1, buf=00000000023d3000, size=512)
sh-369 [000] d... 4.891747: : read(fd=1, buf=00000000023d3000, size=512)
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#include <linux/ptrace.h>
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#include <linux/version.h>
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#include <uapi/linux/bpf.h>
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#include <uapi/linux/seccomp.h>
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#include "bpf_helpers.h"
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#define PROG(F) SEC("kprobe/"__stringify(F)) int bpf_func_##F
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struct bpf_map_def SEC("maps") progs = {
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.type = BPF_MAP_TYPE_PROG_ARRAY,
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.key_size = sizeof(u32),
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.value_size = sizeof(u32),
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.max_entries = 1024,
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};
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SEC("kprobe/seccomp_phase1")
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int bpf_prog1(struct pt_regs *ctx)
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{
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struct seccomp_data sd = {};
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bpf_probe_read(&sd, sizeof(sd), (void *)ctx->di);
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/* dispatch into next BPF program depending on syscall number */
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bpf_tail_call(ctx, &progs, sd.nr);
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/* fall through -> unknown syscall */
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if (sd.nr >= __NR_getuid && sd.nr <= __NR_getsid) {
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char fmt[] = "syscall=%d (one of get/set uid/pid/gid)\n";
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bpf_trace_printk(fmt, sizeof(fmt), sd.nr);
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}
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return 0;
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}
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/* we jump here when syscall number == __NR_write */
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PROG(__NR_write)(struct pt_regs *ctx)
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{
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struct seccomp_data sd = {};
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bpf_probe_read(&sd, sizeof(sd), (void *)ctx->di);
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if (sd.args[2] == 512) {
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char fmt[] = "write(fd=%d, buf=%p, size=%d)\n";
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bpf_trace_printk(fmt, sizeof(fmt),
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sd.args[0], sd.args[1], sd.args[2]);
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}
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return 0;
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}
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PROG(__NR_read)(struct pt_regs *ctx)
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{
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struct seccomp_data sd = {};
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bpf_probe_read(&sd, sizeof(sd), (void *)ctx->di);
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if (sd.args[2] > 128 && sd.args[2] <= 1024) {
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char fmt[] = "read(fd=%d, buf=%p, size=%d)\n";
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bpf_trace_printk(fmt, sizeof(fmt),
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sd.args[0], sd.args[1], sd.args[2]);
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}
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return 0;
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}
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PROG(__NR_mmap)(struct pt_regs *ctx)
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{
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char fmt[] = "mmap\n";
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bpf_trace_printk(fmt, sizeof(fmt));
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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u32 _version SEC("version") = LINUX_VERSION_CODE;
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