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author | 2023-08-18 18:01:13 +0900 | |
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committer | 2023-08-21 15:39:09 -0700 | |
commit | 4a0ee78890699706f59cc9bdf8283ecaa4e0a141 (patch) | |
tree | b8bde98ddaf00497ce97b2df14735b224bc2d1ef /samples/bpf/tracex5.bpf.c | |
parent | samples/bpf: convert to vmlinux.h with tracing programs (diff) | |
download | linux-4a0ee78890699706f59cc9bdf8283ecaa4e0a141.tar.gz linux-4a0ee78890699706f59cc9bdf8283ecaa4e0a141.tar.bz2 linux-4a0ee78890699706f59cc9bdf8283ecaa4e0a141.zip |
samples/bpf: unify bpf program suffix to .bpf with tracing programs
Currently, BPF programs typically have a suffix of .bpf.c. However,
some programs still utilize a mixture of _kern.c suffix alongside the
naming convention. In order to achieve consistency in the naming of
these programs, this commit unifies the inconsistency in the naming
convention of BPF kernel programs.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Link: https://lore.kernel.org/r/20230818090119.477441-4-danieltimlee@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'samples/bpf/tracex5.bpf.c')
-rw-r--r-- | samples/bpf/tracex5.bpf.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/samples/bpf/tracex5.bpf.c b/samples/bpf/tracex5.bpf.c new file mode 100644 index 000000000000..8cd697ee7047 --- /dev/null +++ b/samples/bpf/tracex5.bpf.c @@ -0,0 +1,92 @@ +/* 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 "vmlinux.h" +#include "syscall_nrs.h" +#include <linux/version.h> +#include <uapi/linux/unistd.h> +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +#define __stringify(x) #x +#define PROG(F) SEC("kprobe/"__stringify(F)) int bpf_func_##F + +struct { + __uint(type, BPF_MAP_TYPE_PROG_ARRAY); + __uint(key_size, sizeof(u32)); + __uint(value_size, sizeof(u32)); +#ifdef __mips__ + __uint(max_entries, 6000); /* MIPS n64 syscalls start at 5000 */ +#else + __uint(max_entries, 1024); +#endif +} progs SEC(".maps"); + +SEC("kprobe/__seccomp_filter") +int bpf_prog1(struct pt_regs *ctx) +{ + int sc_nr = (int)PT_REGS_PARM1(ctx); + + /* dispatch into next BPF program depending on syscall number */ + bpf_tail_call(ctx, &progs, sc_nr); + + /* fall through -> unknown syscall */ + if (sc_nr >= __NR_getuid && sc_nr <= __NR_getsid) { + char fmt[] = "syscall=%d (one of get/set uid/pid/gid)\n"; + bpf_trace_printk(fmt, sizeof(fmt), sc_nr); + } + return 0; +} + +/* we jump here when syscall number == __NR_write */ +PROG(SYS__NR_write)(struct pt_regs *ctx) +{ + struct seccomp_data sd; + + bpf_probe_read_kernel(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx)); + 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(SYS__NR_read)(struct pt_regs *ctx) +{ + struct seccomp_data sd; + + bpf_probe_read_kernel(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx)); + 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; +} + +#ifdef __NR_mmap2 +PROG(SYS__NR_mmap2)(struct pt_regs *ctx) +{ + char fmt[] = "mmap2\n"; + + bpf_trace_printk(fmt, sizeof(fmt)); + return 0; +} +#endif + +#ifdef __NR_mmap +PROG(SYS__NR_mmap)(struct pt_regs *ctx) +{ + char fmt[] = "mmap\n"; + + bpf_trace_printk(fmt, sizeof(fmt)); + return 0; +} +#endif + +char _license[] SEC("license") = "GPL"; +u32 _version SEC("version") = LINUX_VERSION_CODE; |