https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: bc0195aad0daa2ad5b0d76cce22b167bc3435590 authored by Linus Torvalds on 12 July 2015, 22:10:30 UTC
Linux 4.2-rc2
Linux 4.2-rc2
Tip revision: bc0195a
tracex5_kern.c
/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*/
#include <linux/ptrace.h>
#include <linux/version.h>
#include <uapi/linux/bpf.h>
#include <uapi/linux/seccomp.h>
#include "bpf_helpers.h"
#define PROG(F) SEC("kprobe/"__stringify(F)) int bpf_func_##F
struct bpf_map_def SEC("maps") progs = {
.type = BPF_MAP_TYPE_PROG_ARRAY,
.key_size = sizeof(u32),
.value_size = sizeof(u32),
.max_entries = 1024,
};
SEC("kprobe/seccomp_phase1")
int bpf_prog1(struct pt_regs *ctx)
{
struct seccomp_data sd = {};
bpf_probe_read(&sd, sizeof(sd), (void *)ctx->di);
/* dispatch into next BPF program depending on syscall number */
bpf_tail_call(ctx, &progs, sd.nr);
/* fall through -> unknown syscall */
if (sd.nr >= __NR_getuid && sd.nr <= __NR_getsid) {
char fmt[] = "syscall=%d (one of get/set uid/pid/gid)\n";
bpf_trace_printk(fmt, sizeof(fmt), sd.nr);
}
return 0;
}
/* we jump here when syscall number == __NR_write */
PROG(__NR_write)(struct pt_regs *ctx)
{
struct seccomp_data sd = {};
bpf_probe_read(&sd, sizeof(sd), (void *)ctx->di);
if (sd.args[2] == 512) {
char fmt[] = "write(fd=%d, buf=%p, size=%d)\n";
bpf_trace_printk(fmt, sizeof(fmt),
sd.args[0], sd.args[1], sd.args[2]);
}
return 0;
}
PROG(__NR_read)(struct pt_regs *ctx)
{
struct seccomp_data sd = {};
bpf_probe_read(&sd, sizeof(sd), (void *)ctx->di);
if (sd.args[2] > 128 && sd.args[2] <= 1024) {
char fmt[] = "read(fd=%d, buf=%p, size=%d)\n";
bpf_trace_printk(fmt, sizeof(fmt),
sd.args[0], sd.args[1], sd.args[2]);
}
return 0;
}
PROG(__NR_mmap)(struct pt_regs *ctx)
{
char fmt[] = "mmap\n";
bpf_trace_printk(fmt, sizeof(fmt));
return 0;
}
char _license[] SEC("license") = "GPL";
u32 _version SEC("version") = LINUX_VERSION_CODE;