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![Alexey Dobriyan](/assets/img/avatar_default.png)
ELF is acronym and therefore should be spelled in all caps. I left one exception at Documentation/arm/nwfpe/nwfpe.rst which looks like being written in the first person. Link: https://lkml.kernel.org/r/Y/3wGWQviIOkyLJW@p183 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
783 lines
17 KiB
C
783 lines
17 KiB
C
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
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/*
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* resolve_btfids scans ELF object for .BTF_ids section and resolves
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* its symbols with BTF ID values.
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*
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* Each symbol points to 4 bytes data and is expected to have
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* following name syntax:
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*
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* __BTF_ID__<type>__<symbol>[__<id>]
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*
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* type is:
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*
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* func - lookup BTF_KIND_FUNC symbol with <symbol> name
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* and store its ID into the data:
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*
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* __BTF_ID__func__vfs_close__1:
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* .zero 4
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*
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* struct - lookup BTF_KIND_STRUCT symbol with <symbol> name
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* and store its ID into the data:
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*
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* __BTF_ID__struct__sk_buff__1:
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* .zero 4
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*
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* union - lookup BTF_KIND_UNION symbol with <symbol> name
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* and store its ID into the data:
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*
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* __BTF_ID__union__thread_union__1:
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* .zero 4
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*
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* typedef - lookup BTF_KIND_TYPEDEF symbol with <symbol> name
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* and store its ID into the data:
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*
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* __BTF_ID__typedef__pid_t__1:
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* .zero 4
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*
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* set - store symbol size into first 4 bytes and sort following
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* ID list
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*
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* __BTF_ID__set__list:
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* .zero 4
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* list:
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* __BTF_ID__func__vfs_getattr__3:
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* .zero 4
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* __BTF_ID__func__vfs_fallocate__4:
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* .zero 4
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*
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* set8 - store symbol size into first 4 bytes and sort following
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* ID list
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*
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* __BTF_ID__set8__list:
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* .zero 8
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* list:
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* __BTF_ID__func__vfs_getattr__3:
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* .zero 4
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* .word (1 << 0) | (1 << 2)
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* __BTF_ID__func__vfs_fallocate__5:
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* .zero 4
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* .word (1 << 3) | (1 << 1) | (1 << 2)
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <libelf.h>
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#include <gelf.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <linux/rbtree.h>
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#include <linux/zalloc.h>
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#include <linux/err.h>
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#include <bpf/btf.h>
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#include <bpf/libbpf.h>
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#include <subcmd/parse-options.h>
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#define BTF_IDS_SECTION ".BTF_ids"
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#define BTF_ID "__BTF_ID__"
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#define BTF_STRUCT "struct"
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#define BTF_UNION "union"
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#define BTF_TYPEDEF "typedef"
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#define BTF_FUNC "func"
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#define BTF_SET "set"
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#define BTF_SET8 "set8"
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#define ADDR_CNT 100
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struct btf_id {
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struct rb_node rb_node;
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char *name;
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union {
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int id;
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int cnt;
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};
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int addr_cnt;
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bool is_set;
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bool is_set8;
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Elf64_Addr addr[ADDR_CNT];
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};
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struct object {
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const char *path;
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const char *btf;
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const char *base_btf_path;
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struct {
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int fd;
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Elf *elf;
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Elf_Data *symbols;
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Elf_Data *idlist;
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int symbols_shndx;
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int idlist_shndx;
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size_t strtabidx;
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unsigned long idlist_addr;
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} efile;
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struct rb_root sets;
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struct rb_root structs;
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struct rb_root unions;
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struct rb_root typedefs;
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struct rb_root funcs;
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int nr_funcs;
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int nr_structs;
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int nr_unions;
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int nr_typedefs;
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};
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static int verbose;
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static int eprintf(int level, int var, const char *fmt, ...)
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{
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va_list args;
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int ret = 0;
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if (var >= level) {
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va_start(args, fmt);
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ret = vfprintf(stderr, fmt, args);
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va_end(args);
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}
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return ret;
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}
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#ifndef pr_fmt
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#define pr_fmt(fmt) fmt
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#endif
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#define pr_debug(fmt, ...) \
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eprintf(1, verbose, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_debugN(n, fmt, ...) \
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eprintf(n, verbose, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_debug2(fmt, ...) pr_debugN(2, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_err(fmt, ...) \
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eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_info(fmt, ...) \
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eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
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static bool is_btf_id(const char *name)
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{
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return name && !strncmp(name, BTF_ID, sizeof(BTF_ID) - 1);
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}
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static struct btf_id *btf_id__find(struct rb_root *root, const char *name)
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{
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struct rb_node *p = root->rb_node;
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struct btf_id *id;
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int cmp;
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while (p) {
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id = rb_entry(p, struct btf_id, rb_node);
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cmp = strcmp(id->name, name);
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if (cmp < 0)
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p = p->rb_left;
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else if (cmp > 0)
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p = p->rb_right;
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else
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return id;
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}
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return NULL;
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}
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static struct btf_id *
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btf_id__add(struct rb_root *root, char *name, bool unique)
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{
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struct rb_node **p = &root->rb_node;
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struct rb_node *parent = NULL;
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struct btf_id *id;
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int cmp;
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while (*p != NULL) {
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parent = *p;
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id = rb_entry(parent, struct btf_id, rb_node);
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cmp = strcmp(id->name, name);
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if (cmp < 0)
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p = &(*p)->rb_left;
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else if (cmp > 0)
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p = &(*p)->rb_right;
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else
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return unique ? NULL : id;
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}
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id = zalloc(sizeof(*id));
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if (id) {
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pr_debug("adding symbol %s\n", name);
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id->name = name;
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rb_link_node(&id->rb_node, parent, p);
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rb_insert_color(&id->rb_node, root);
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}
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return id;
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}
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static char *get_id(const char *prefix_end)
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{
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/*
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* __BTF_ID__func__vfs_truncate__0
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* prefix_end = ^
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* pos = ^
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*/
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int len = strlen(prefix_end);
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int pos = sizeof("__") - 1;
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char *p, *id;
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if (pos >= len)
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return NULL;
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id = strdup(prefix_end + pos);
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if (id) {
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/*
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* __BTF_ID__func__vfs_truncate__0
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* id = ^
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*
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* cut the unique id part
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*/
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p = strrchr(id, '_');
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p--;
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if (*p != '_') {
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free(id);
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return NULL;
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}
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*p = '\0';
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}
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return id;
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}
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static struct btf_id *add_set(struct object *obj, char *name, bool is_set8)
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{
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/*
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* __BTF_ID__set__name
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* name = ^
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* id = ^
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*/
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char *id = name + (is_set8 ? sizeof(BTF_SET8 "__") : sizeof(BTF_SET "__")) - 1;
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int len = strlen(name);
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if (id >= name + len) {
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pr_err("FAILED to parse set name: %s\n", name);
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return NULL;
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}
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return btf_id__add(&obj->sets, id, true);
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}
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static struct btf_id *add_symbol(struct rb_root *root, char *name, size_t size)
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{
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char *id;
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id = get_id(name + size);
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if (!id) {
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pr_err("FAILED to parse symbol name: %s\n", name);
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return NULL;
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}
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return btf_id__add(root, id, false);
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}
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/* Older libelf.h and glibc elf.h might not yet define the ELF compression types. */
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#ifndef SHF_COMPRESSED
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#define SHF_COMPRESSED (1 << 11) /* Section with compressed data. */
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#endif
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/*
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* The data of compressed section should be aligned to 4
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* (for 32bit) or 8 (for 64 bit) bytes. The binutils ld
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* sets sh_addralign to 1, which makes libelf fail with
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* misaligned section error during the update:
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* FAILED elf_update(WRITE): invalid section alignment
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*
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* While waiting for ld fix, we fix the compressed sections
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* sh_addralign value manualy.
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*/
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static int compressed_section_fix(Elf *elf, Elf_Scn *scn, GElf_Shdr *sh)
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{
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int expected = gelf_getclass(elf) == ELFCLASS32 ? 4 : 8;
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if (!(sh->sh_flags & SHF_COMPRESSED))
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return 0;
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if (sh->sh_addralign == expected)
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return 0;
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pr_debug2(" - fixing wrong alignment sh_addralign %u, expected %u\n",
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sh->sh_addralign, expected);
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sh->sh_addralign = expected;
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if (gelf_update_shdr(scn, sh) == 0) {
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pr_err("FAILED cannot update section header: %s\n",
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elf_errmsg(-1));
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return -1;
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}
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return 0;
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}
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static int elf_collect(struct object *obj)
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{
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Elf_Scn *scn = NULL;
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size_t shdrstrndx;
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int idx = 0;
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Elf *elf;
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int fd;
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fd = open(obj->path, O_RDWR, 0666);
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if (fd == -1) {
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pr_err("FAILED cannot open %s: %s\n",
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obj->path, strerror(errno));
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return -1;
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}
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elf_version(EV_CURRENT);
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elf = elf_begin(fd, ELF_C_RDWR_MMAP, NULL);
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if (!elf) {
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close(fd);
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pr_err("FAILED cannot create ELF descriptor: %s\n",
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elf_errmsg(-1));
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return -1;
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}
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obj->efile.fd = fd;
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obj->efile.elf = elf;
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elf_flagelf(elf, ELF_C_SET, ELF_F_LAYOUT);
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if (elf_getshdrstrndx(elf, &shdrstrndx) != 0) {
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pr_err("FAILED cannot get shdr str ndx\n");
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return -1;
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}
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/*
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* Scan all the elf sections and look for save data
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* from .BTF_ids section and symbols.
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*/
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while ((scn = elf_nextscn(elf, scn)) != NULL) {
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Elf_Data *data;
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GElf_Shdr sh;
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char *name;
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idx++;
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if (gelf_getshdr(scn, &sh) != &sh) {
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pr_err("FAILED get section(%d) header\n", idx);
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return -1;
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}
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name = elf_strptr(elf, shdrstrndx, sh.sh_name);
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if (!name) {
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pr_err("FAILED get section(%d) name\n", idx);
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return -1;
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}
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data = elf_getdata(scn, 0);
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if (!data) {
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pr_err("FAILED to get section(%d) data from %s\n",
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idx, name);
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return -1;
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}
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pr_debug2("section(%d) %s, size %ld, link %d, flags %lx, type=%d\n",
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idx, name, (unsigned long) data->d_size,
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(int) sh.sh_link, (unsigned long) sh.sh_flags,
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(int) sh.sh_type);
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if (sh.sh_type == SHT_SYMTAB) {
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obj->efile.symbols = data;
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obj->efile.symbols_shndx = idx;
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obj->efile.strtabidx = sh.sh_link;
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} else if (!strcmp(name, BTF_IDS_SECTION)) {
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obj->efile.idlist = data;
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obj->efile.idlist_shndx = idx;
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obj->efile.idlist_addr = sh.sh_addr;
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}
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if (compressed_section_fix(elf, scn, &sh))
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return -1;
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}
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return 0;
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}
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static int symbols_collect(struct object *obj)
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{
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Elf_Scn *scn = NULL;
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int n, i;
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GElf_Shdr sh;
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char *name;
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scn = elf_getscn(obj->efile.elf, obj->efile.symbols_shndx);
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if (!scn)
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return -1;
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if (gelf_getshdr(scn, &sh) != &sh)
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return -1;
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n = sh.sh_size / sh.sh_entsize;
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/*
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* Scan symbols and look for the ones starting with
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* __BTF_ID__* over .BTF_ids section.
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*/
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for (i = 0; i < n; i++) {
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char *prefix;
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struct btf_id *id;
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GElf_Sym sym;
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if (!gelf_getsym(obj->efile.symbols, i, &sym))
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return -1;
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if (sym.st_shndx != obj->efile.idlist_shndx)
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continue;
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name = elf_strptr(obj->efile.elf, obj->efile.strtabidx,
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sym.st_name);
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if (!is_btf_id(name))
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continue;
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/*
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* __BTF_ID__TYPE__vfs_truncate__0
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* prefix = ^
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*/
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prefix = name + sizeof(BTF_ID) - 1;
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/* struct */
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if (!strncmp(prefix, BTF_STRUCT, sizeof(BTF_STRUCT) - 1)) {
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obj->nr_structs++;
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id = add_symbol(&obj->structs, prefix, sizeof(BTF_STRUCT) - 1);
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/* union */
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} else if (!strncmp(prefix, BTF_UNION, sizeof(BTF_UNION) - 1)) {
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obj->nr_unions++;
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id = add_symbol(&obj->unions, prefix, sizeof(BTF_UNION) - 1);
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/* typedef */
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} else if (!strncmp(prefix, BTF_TYPEDEF, sizeof(BTF_TYPEDEF) - 1)) {
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obj->nr_typedefs++;
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id = add_symbol(&obj->typedefs, prefix, sizeof(BTF_TYPEDEF) - 1);
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/* func */
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} else if (!strncmp(prefix, BTF_FUNC, sizeof(BTF_FUNC) - 1)) {
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obj->nr_funcs++;
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id = add_symbol(&obj->funcs, prefix, sizeof(BTF_FUNC) - 1);
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/* set8 */
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} else if (!strncmp(prefix, BTF_SET8, sizeof(BTF_SET8) - 1)) {
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id = add_set(obj, prefix, true);
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/*
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* SET8 objects store list's count, which is encoded
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* in symbol's size, together with 'cnt' field hence
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* that - 1.
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*/
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if (id) {
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id->cnt = sym.st_size / sizeof(uint64_t) - 1;
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id->is_set8 = true;
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}
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/* set */
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} else if (!strncmp(prefix, BTF_SET, sizeof(BTF_SET) - 1)) {
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id = add_set(obj, prefix, false);
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/*
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* SET objects store list's count, which is encoded
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* in symbol's size, together with 'cnt' field hence
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* that - 1.
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*/
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if (id) {
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id->cnt = sym.st_size / sizeof(int) - 1;
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id->is_set = true;
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}
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} else {
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pr_err("FAILED unsupported prefix %s\n", prefix);
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return -1;
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}
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if (!id)
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return -ENOMEM;
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if (id->addr_cnt >= ADDR_CNT) {
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pr_err("FAILED symbol %s crossed the number of allowed lists\n",
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id->name);
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return -1;
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}
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id->addr[id->addr_cnt++] = sym.st_value;
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}
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return 0;
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}
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static int symbols_resolve(struct object *obj)
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{
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int nr_typedefs = obj->nr_typedefs;
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int nr_structs = obj->nr_structs;
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int nr_unions = obj->nr_unions;
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int nr_funcs = obj->nr_funcs;
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struct btf *base_btf = NULL;
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int err, type_id;
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struct btf *btf;
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__u32 nr_types;
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if (obj->base_btf_path) {
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base_btf = btf__parse(obj->base_btf_path, NULL);
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err = libbpf_get_error(base_btf);
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if (err) {
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pr_err("FAILED: load base BTF from %s: %s\n",
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obj->base_btf_path, strerror(-err));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
btf = btf__parse_split(obj->btf ?: obj->path, base_btf);
|
|
err = libbpf_get_error(btf);
|
|
if (err) {
|
|
pr_err("FAILED: load BTF from %s: %s\n",
|
|
obj->btf ?: obj->path, strerror(-err));
|
|
goto out;
|
|
}
|
|
|
|
err = -1;
|
|
nr_types = btf__type_cnt(btf);
|
|
|
|
/*
|
|
* Iterate all the BTF types and search for collected symbol IDs.
|
|
*/
|
|
for (type_id = 1; type_id < nr_types; type_id++) {
|
|
const struct btf_type *type;
|
|
struct rb_root *root;
|
|
struct btf_id *id;
|
|
const char *str;
|
|
int *nr;
|
|
|
|
type = btf__type_by_id(btf, type_id);
|
|
if (!type) {
|
|
pr_err("FAILED: malformed BTF, can't resolve type for ID %d\n",
|
|
type_id);
|
|
goto out;
|
|
}
|
|
|
|
if (btf_is_func(type) && nr_funcs) {
|
|
nr = &nr_funcs;
|
|
root = &obj->funcs;
|
|
} else if (btf_is_struct(type) && nr_structs) {
|
|
nr = &nr_structs;
|
|
root = &obj->structs;
|
|
} else if (btf_is_union(type) && nr_unions) {
|
|
nr = &nr_unions;
|
|
root = &obj->unions;
|
|
} else if (btf_is_typedef(type) && nr_typedefs) {
|
|
nr = &nr_typedefs;
|
|
root = &obj->typedefs;
|
|
} else
|
|
continue;
|
|
|
|
str = btf__name_by_offset(btf, type->name_off);
|
|
if (!str) {
|
|
pr_err("FAILED: malformed BTF, can't resolve name for ID %d\n",
|
|
type_id);
|
|
goto out;
|
|
}
|
|
|
|
id = btf_id__find(root, str);
|
|
if (id) {
|
|
if (id->id) {
|
|
pr_info("WARN: multiple IDs found for '%s': %d, %d - using %d\n",
|
|
str, id->id, type_id, id->id);
|
|
} else {
|
|
id->id = type_id;
|
|
(*nr)--;
|
|
}
|
|
}
|
|
}
|
|
|
|
err = 0;
|
|
out:
|
|
btf__free(base_btf);
|
|
btf__free(btf);
|
|
return err;
|
|
}
|
|
|
|
static int id_patch(struct object *obj, struct btf_id *id)
|
|
{
|
|
Elf_Data *data = obj->efile.idlist;
|
|
int *ptr = data->d_buf;
|
|
int i;
|
|
|
|
/* For set, set8, id->id may be 0 */
|
|
if (!id->id && !id->is_set && !id->is_set8)
|
|
pr_err("WARN: resolve_btfids: unresolved symbol %s\n", id->name);
|
|
|
|
for (i = 0; i < id->addr_cnt; i++) {
|
|
unsigned long addr = id->addr[i];
|
|
unsigned long idx = addr - obj->efile.idlist_addr;
|
|
|
|
pr_debug("patching addr %5lu: ID %7d [%s]\n",
|
|
idx, id->id, id->name);
|
|
|
|
if (idx >= data->d_size) {
|
|
pr_err("FAILED patching index %lu out of bounds %lu\n",
|
|
idx, data->d_size);
|
|
return -1;
|
|
}
|
|
|
|
idx = idx / sizeof(int);
|
|
ptr[idx] = id->id;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __symbols_patch(struct object *obj, struct rb_root *root)
|
|
{
|
|
struct rb_node *next;
|
|
struct btf_id *id;
|
|
|
|
next = rb_first(root);
|
|
while (next) {
|
|
id = rb_entry(next, struct btf_id, rb_node);
|
|
|
|
if (id_patch(obj, id))
|
|
return -1;
|
|
|
|
next = rb_next(next);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_id(const void *pa, const void *pb)
|
|
{
|
|
const int *a = pa, *b = pb;
|
|
|
|
return *a - *b;
|
|
}
|
|
|
|
static int sets_patch(struct object *obj)
|
|
{
|
|
Elf_Data *data = obj->efile.idlist;
|
|
int *ptr = data->d_buf;
|
|
struct rb_node *next;
|
|
|
|
next = rb_first(&obj->sets);
|
|
while (next) {
|
|
unsigned long addr, idx;
|
|
struct btf_id *id;
|
|
int *base;
|
|
int cnt;
|
|
|
|
id = rb_entry(next, struct btf_id, rb_node);
|
|
addr = id->addr[0];
|
|
idx = addr - obj->efile.idlist_addr;
|
|
|
|
/* sets are unique */
|
|
if (id->addr_cnt != 1) {
|
|
pr_err("FAILED malformed data for set '%s'\n",
|
|
id->name);
|
|
return -1;
|
|
}
|
|
|
|
idx = idx / sizeof(int);
|
|
base = &ptr[idx] + (id->is_set8 ? 2 : 1);
|
|
cnt = ptr[idx];
|
|
|
|
pr_debug("sorting addr %5lu: cnt %6d [%s]\n",
|
|
(idx + 1) * sizeof(int), cnt, id->name);
|
|
|
|
qsort(base, cnt, id->is_set8 ? sizeof(uint64_t) : sizeof(int), cmp_id);
|
|
|
|
next = rb_next(next);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int symbols_patch(struct object *obj)
|
|
{
|
|
int err;
|
|
|
|
if (__symbols_patch(obj, &obj->structs) ||
|
|
__symbols_patch(obj, &obj->unions) ||
|
|
__symbols_patch(obj, &obj->typedefs) ||
|
|
__symbols_patch(obj, &obj->funcs) ||
|
|
__symbols_patch(obj, &obj->sets))
|
|
return -1;
|
|
|
|
if (sets_patch(obj))
|
|
return -1;
|
|
|
|
/* Set type to ensure endian translation occurs. */
|
|
obj->efile.idlist->d_type = ELF_T_WORD;
|
|
|
|
elf_flagdata(obj->efile.idlist, ELF_C_SET, ELF_F_DIRTY);
|
|
|
|
err = elf_update(obj->efile.elf, ELF_C_WRITE);
|
|
if (err < 0) {
|
|
pr_err("FAILED elf_update(WRITE): %s\n",
|
|
elf_errmsg(-1));
|
|
}
|
|
|
|
pr_debug("update %s for %s\n",
|
|
err >= 0 ? "ok" : "failed", obj->path);
|
|
return err < 0 ? -1 : 0;
|
|
}
|
|
|
|
static const char * const resolve_btfids_usage[] = {
|
|
"resolve_btfids [<options>] <ELF object>",
|
|
NULL
|
|
};
|
|
|
|
int main(int argc, const char **argv)
|
|
{
|
|
struct object obj = {
|
|
.efile = {
|
|
.idlist_shndx = -1,
|
|
.symbols_shndx = -1,
|
|
},
|
|
.structs = RB_ROOT,
|
|
.unions = RB_ROOT,
|
|
.typedefs = RB_ROOT,
|
|
.funcs = RB_ROOT,
|
|
.sets = RB_ROOT,
|
|
};
|
|
struct option btfid_options[] = {
|
|
OPT_INCR('v', "verbose", &verbose,
|
|
"be more verbose (show errors, etc)"),
|
|
OPT_STRING(0, "btf", &obj.btf, "BTF data",
|
|
"BTF data"),
|
|
OPT_STRING('b', "btf_base", &obj.base_btf_path, "file",
|
|
"path of file providing base BTF"),
|
|
OPT_END()
|
|
};
|
|
int err = -1;
|
|
|
|
argc = parse_options(argc, argv, btfid_options, resolve_btfids_usage,
|
|
PARSE_OPT_STOP_AT_NON_OPTION);
|
|
if (argc != 1)
|
|
usage_with_options(resolve_btfids_usage, btfid_options);
|
|
|
|
obj.path = argv[0];
|
|
|
|
if (elf_collect(&obj))
|
|
goto out;
|
|
|
|
/*
|
|
* We did not find .BTF_ids section or symbols section,
|
|
* nothing to do..
|
|
*/
|
|
if (obj.efile.idlist_shndx == -1 ||
|
|
obj.efile.symbols_shndx == -1) {
|
|
pr_debug("Cannot find .BTF_ids or symbols sections, nothing to do\n");
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (symbols_collect(&obj))
|
|
goto out;
|
|
|
|
if (symbols_resolve(&obj))
|
|
goto out;
|
|
|
|
if (symbols_patch(&obj))
|
|
goto out;
|
|
|
|
err = 0;
|
|
out:
|
|
if (obj.efile.elf) {
|
|
elf_end(obj.efile.elf);
|
|
close(obj.efile.fd);
|
|
}
|
|
return err;
|
|
}
|