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bpf: Add bpf_ksym_find function
Adding bpf_ksym_find function that is used bpf bpf address lookup functions: __bpf_address_lookup is_bpf_text_address while keeping bpf_prog_kallsyms_find to be used only for lookup of bpf_prog objects (will happen in following changes). Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200312195610.346362-8-jolsa@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -668,19 +668,27 @@ static struct bpf_prog *bpf_prog_kallsyms_find(unsigned long addr)
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NULL;
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}
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static struct bpf_ksym *bpf_ksym_find(unsigned long addr)
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{
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struct latch_tree_node *n;
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n = latch_tree_find((void *)addr, &bpf_tree, &bpf_tree_ops);
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return n ? container_of(n, struct bpf_ksym, tnode) : NULL;
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}
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const char *__bpf_address_lookup(unsigned long addr, unsigned long *size,
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unsigned long *off, char *sym)
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{
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struct bpf_prog *prog;
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struct bpf_ksym *ksym;
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char *ret = NULL;
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rcu_read_lock();
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prog = bpf_prog_kallsyms_find(addr);
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if (prog) {
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unsigned long symbol_start = prog->aux->ksym.start;
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unsigned long symbol_end = prog->aux->ksym.end;
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ksym = bpf_ksym_find(addr);
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if (ksym) {
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unsigned long symbol_start = ksym->start;
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unsigned long symbol_end = ksym->end;
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strncpy(sym, prog->aux->ksym.name, KSYM_NAME_LEN);
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strncpy(sym, ksym->name, KSYM_NAME_LEN);
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ret = sym;
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if (size)
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@ -698,7 +706,7 @@ bool is_bpf_text_address(unsigned long addr)
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bool ret;
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rcu_read_lock();
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ret = bpf_prog_kallsyms_find(addr) != NULL;
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ret = bpf_ksym_find(addr) != NULL;
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rcu_read_unlock();
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return ret;
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