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456d53554c
With the introduction of kprobe.multi, it is now possible to attach
multiple kprobes to a single BPF program without the need for multiple
definitions. Additionally, this method supports wildcard-based
matching, allowing for further simplification of BPF programs. In here,
an asterisk (*) wildcard is used to map to all symbols relevant to
spin_{lock|unlock}.
Furthermore, since kprobe.multi handles symbol matching, this commit
eliminates the need for the previous logic of reading the ksym table to
verify the existence of symbols.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Link: https://lore.kernel.org/r/20230818090119.477441-10-danieltimlee@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/* Copyright (c) 2016, Facebook
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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 "vmlinux.h"
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#include <linux/version.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#ifndef PERF_MAX_STACK_DEPTH
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#define PERF_MAX_STACK_DEPTH 127
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#endif
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, long);
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__type(value, long);
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__uint(max_entries, 1024);
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} my_map SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_HASH);
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__uint(key_size, sizeof(long));
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__uint(value_size, sizeof(long));
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__uint(max_entries, 1024);
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} my_map2 SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_STACK_TRACE);
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__uint(key_size, sizeof(u32));
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__uint(value_size, PERF_MAX_STACK_DEPTH * sizeof(u64));
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__uint(max_entries, 10000);
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} stackmap SEC(".maps");
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#define PROG(foo) \
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int foo(struct pt_regs *ctx) \
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{ \
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long v = PT_REGS_IP(ctx), *val; \
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\
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val = bpf_map_lookup_elem(&my_map, &v); \
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bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \
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bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \
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bpf_map_delete_elem(&my_map2, &v); \
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bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \
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return 0; \
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}
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/* add kprobes to all possible *spin* functions */
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SEC("kprobe.multi/spin_*lock*")PROG(spin_lock)
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SEC("kprobe.multi/*_spin_on_owner")PROG(spin_on_owner)
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SEC("kprobe.multi/_raw_spin_*lock*")PROG(raw_spin_lock)
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/* and to inner bpf helpers */
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SEC("kprobe/htab_map_update_elem")PROG(p15)
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SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16)
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SEC("kprobe/htab_map_alloc")PROG(p17)
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char _license[] SEC("license") = "GPL";
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u32 _version SEC("version") = LINUX_VERSION_CODE;
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