MAJOR=4 MINOR=4 DEVNAME=tty4 _I|Mjq؂File not found. + l4( (  fB- /_I|+5 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) #ifndef _GNU_SOURCE #define _GNU_SOURCE #endif #include #include #include #include #include "libbpf_internal.h" #include "str_error.h" /* A SHT_GNU_versym section holds 16-bit words. This bit is set if * the symbol is hidden and can only be seen when referenced using an * explicit version number. This is a GNU extension. */ #define VERSYM_HIDDEN 0x8000 /* This is the mask for the rest of the data in a word read from a * SHT_GNU_versym section. */ #define VERSYM_VERSION 0x7fff int elf_open(const char *binary_path, struct elf_fd *elf_fd) { char errmsg[STRERR_BUFSIZE]; int fd, ret; Elf *elf; elf_fd->elf = NULL; elf_fd->fd = -1; if (elf_version(EV_CURRENT) == EV_NONE) { pr_warn("elf: failed to init libelf for %s\n", binary_path); return -LIBBPF_ERRNO__LIBELF; } fd = open(binary_path, O_RDONLY | O_CLOEXEC); if (fd < 0) { ret = -errno; pr_warn("elf: failed to open %s: %s\n", binary_path, libbpf_strerror_r(ret, errmsg, sizeof(errmsg))); return ret; } elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); if (!elf) { pr_warn("elf: could not read elf from %s: %s\n", binary_path, elf_errmsg(-1)); close(fd); return -LIBBPF_ERRNO__FORMAT; } elf_fd->fd = fd; elf_fd->elf = elf; return 0; } void elf_close(struct elf_fd *elf_fd) { if (!elf_fd) return; elf_end(elf_fd->elf); close(elf_fd->fd); } /* Return next ELF section of sh_type after scn, or first of that type if scn is NULL. */ static Elf_Scn *elf_find_next_scn_by_type(Elf *elf, int sh_type, Elf_Scn *scn) { while ((scn = elf_nextscn(elf, scn)) != NULL) { GElf_Shdr sh; if (!gelf_getshdr(scn, &sh)) continue; if (sh.sh_type == sh_type) return scn; } return NULL; } struct elf_sym { const char *name; GElf_Sym sym; GElf_Shdr sh; int ver; bool hidden; }; struct elf_sym_iter { Elf *elf; Elf_Data *syms; Elf_Data *versyms; Elf_Data *verdefs; size_t nr_syms; size_t strtabidx; size_t verdef_strtabidx; size_t next_sym_idx; struct elf_sym sym; int st_type; }; static int elf_sym_iter_new(struct elf_sym_iter *iter, Elf *elf, const char *binary_path, int sh_type, int st_type) { Elf_Scn *scn = NULL; GElf_Ehdr ehdr; GElf_Shdr sh; memset(iter, 0, sizeof(*iter)); if (!gelf_getehdr(elf, &ehdr)) { pr_warn("elf: failed to get ehdr from %s: %s\n", binary_path, elf_errmsg(-1)); return -EINVAL; } scn = elf_find_next_scn_by_type(elf, sh_type, NULL); if (!scn) { pr_debug("elf: failed to find symbol table ELF sections in '%s'\n", binary_path); return -ENOENT; } if (!gelf_getshdr(scn, &sh)) return -EINVAL; iter->strtabidx = sh.sh_link; iter->syms = elf_getdata(scn, 0); if (!iter->syms) { pr_warn("elf: failed to get symbols for symtab section in '%s': %s\n", binary_path, elf_errmsg(-1)); return -EINVAL; } iter->nr_syms = iter->syms->d_size / sh.sh_entsize; iter->elf = elf; iter->st_type = st_type; /* Version symbol table is meaningful to dynsym only */ if (sh_type != SHT_DYNSYM) return 0; scn = elf_find_next_scn_by_type(elf, SHT_GNU_versym, NULL); if (!scn) return 0; iter->versyms = elf_getdata(scn, 0); scn = elf_find_next_scn_by_type(elf, SHT_GNU_verdef, NULL); if (!scn) return 0; iter->verdefs = elf_getdata(scn, 0); if (!iter->verdefs || !gelf_getshdr(scn, &sh)) { pr_warn("elf: failed to get verdef ELF section in '%s'\n", binary_path); return -EINVAL; } iter->verdef_strtabidx = sh.sh_link; return 0; } static struct elf_sym *elf_sym_iter_next(struct elf_sym_iter *iter) { struct elf_sym *ret = &iter->sym; GElf_Sym *sym = &ret->sym; const char *name = NULL; GElf_Versym versym; Elf_Scn *sym_scn; size_t idx; for (idx = iter->next_sym_idx; idx < iter->nr_syms; idx++) { if (!gelf_getsym(iter->syms, idx, sym)) continue; if (GELF_ST_TYPE(sym->st_info) != iter->st_type) continue; name = elf_strptr(i