/*- * Copyright (c) 1997 Doug Rabson * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: src/sys/kern/kern_linker.c,v 1.41.2.3 2001/11/21 17:50:35 luigi Exp $ */ #include "opt_ddb.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef _KERNEL_VIRTUAL #include #endif #ifdef KLD_DEBUG int kld_debug = 1; #endif /* Metadata from the static kernel */ SET_DECLARE(modmetadata_set, struct mod_metadata); MALLOC_DEFINE(M_LINKER, "kld", "kernel linker"); linker_file_t linker_current_file; linker_file_t linker_kernel_file; static struct lock llf_lock; /* lock for the file list */ static struct lock kld_lock; static linker_class_list_t classes; static linker_file_list_t linker_files; static int next_file_id = 1; /* XXX wrong name; we're looking at version provision tags here, not modules */ typedef TAILQ_HEAD(, modlist) modlisthead_t; struct modlist { TAILQ_ENTRY(modlist) link; /* chain together all modules */ linker_file_t container; const char *name; int version; }; typedef struct modlist *modlist_t; static modlisthead_t found_modules; static int linker_load_module(const char *kldname, const char *modname, struct linker_file *parent, struct mod_depend *verinfo, struct linker_file **lfpp); static char * linker_strdup(const char *str) { char *result; result = kmalloc(strlen(str) + 1, M_LINKER, M_WAITOK); strcpy(result, str); return(result); } static const char * linker_basename(const char *path) { const char *filename; filename = strrchr(path, '/'); if (filename == NULL) return path; if (filename[1]) filename++; return (filename); } static void linker_init(void* arg) { lockinit(&llf_lock, "klink", 0, 0); lockinit(&kld_lock, "kldlk", 0, LK_CANRECURSE); TAILQ_INIT(&classes); TAILQ_INIT(&linker_files); } SYSINIT(linker, SI_BOOT2_KLD, SI_ORDER_FIRST, linker_init, 0); int linker_add_class(const char* desc, void* priv, struct linker_class_ops* ops) { linker_class_t lc; lc = kmalloc(sizeof(struct linker_class), M_LINKER, M_NOWAIT | M_ZERO); if (!lc) return ENOMEM; lc->desc = desc; lc->priv = priv; lc->ops = ops; TAILQ_INSERT_HEAD(&classes, lc, link); return 0; } static void linker_file_sysinit(linker_file_t lf) { struct sysinit** start, ** stop; struct sysinit** sipp; struct sysinit** xipp; struct sysinit* save; KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", lf->filename)); if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) return; /* * Perform a bubble sort of the system initialization objects by * their subsystem (primary key) and order (secondary key). * * Since some things care about execution order, this is the * operation which ensures continued function. */ for (sipp = start; sipp < stop; sipp++) { for (xipp = sipp + 1; xipp < stop; xipp++) { if ((*sipp)->subsystem < (*xipp)->subsystem || ((*sipp)->subsystem == (*xipp)->subsystem && (*sipp)->order <= (*xipp)->order)) continue; /* skip*/ save = *sipp; *sipp = *xipp; *xipp = save; } } /* * Traverse the (now) ordered list of system initialization tasks. * Perform each task, and continue on to the next task. */ for (sipp = start; sipp < stop; sipp++) { if ((*sipp)->subsystem == SI_SPECIAL_DUMMY) continue; /* skip dummy task(s)*/ /* Call function */ (*((*sipp)->func))((*sipp)->udata); } } static void linker_file_sysuninit(linker_file_t lf) { struct sysinit** start, ** stop; struct sysinit** sipp; struct sysinit** xipp; struct sysinit* save; KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", lf->filename)); if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, NULL) != 0) return; /* * Perform a reverse bubble sort of the system initialization objects * by their subsystem (primary key) and order (secondary key). * * Since some things care about execution order, this is the * operation which ensures continued function. */ for (sipp = start; sipp < stop; sipp++) { for (xipp = sipp + 1; xipp < stop; xipp++) { if ((*sipp)->subsystem > (*xipp)->subsystem || ((*sipp)->subsystem == (*xipp)->subsystem && (*sipp)->order >= (*xipp)->order)) continue; /* skip*/ save = *sipp; *sipp = *xipp; *xipp = save; } } /* * Traverse the (now) ordered list of system initialization tasks. * Perform each task, and continue on to the next task. */ for (sipp = start; sipp < stop; sipp++) { if ((*sipp)->subsystem == SI_SPECIAL_DUMMY) continue; /* skip dummy task(s)*/ /* Call function */ (*((*sipp)->func))((*sipp)->udata); } } static void linker_file_register_sysctls(linker_file_t lf) { struct sysctl_oid **start, **stop, **oidp; KLD_DPF(FILE, ("linker_file_register_sysctls: registering SYSCTLs for %s\n", lf->filename)); if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) return; for (oidp = start; oidp < stop; oidp++) sysctl_register_oid(*oidp); } static void linker_file_unregister_sysctls(linker_file_t lf) { struct sysctl_oid **start, **stop, **oidp; KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs for %s\n", lf->filename)); if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) return; for (oidp = start; oidp < stop; oidp++) sysctl_unregister_oid(*oidp); } static int linker_file_register_modules(linker_file_t lf) { struct mod_metadata **start, **stop, **mdp; const moduledata_t *moddata; int first_error, error; KLD_DPF(FILE, ("linker_file_register_modules: registering modules in %s\n", lf->filename)); if (linker_file_lookup_set(lf, "modmetadata_set", &start, &stop, NULL) != 0) { /* * This fallback should be unnecessary, but if we get booted * from boot2 instead of loader and we are missing our * metadata then we have to try the best we can. */ if (lf == linker_kernel_file) { start = SET_BEGIN(modmetadata_set); stop = SET_LIMIT(modmetadata_set); } else return (0); } first_error = 0; for (mdp = start; mdp < stop; mdp++) { if ((*mdp)->md_type != MDT_MODULE) continue; moddata = (*mdp)->md_data; KLD_DPF(FILE, ("Registering module %s in %s\n", moddata->name, lf->filename)); error = module_register(moddata, lf); if (error) { kprintf("Module %s failed to register: %d\n", moddata->name, error); if (first_error == 0) first_error = error; } } return (first_error); } static void linker_init_kernel_modules(void) { linker_file_register_modules(linker_kernel_file); } SYSINIT(linker_kernel, SI_BOOT2_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0); int linker_load_file(const char *filename, linker_file_t *result) { linker_class_t lc; linker_file_t lf; int foundfile, error = 0; /* Refuse to load modules if securelevel raised */ if (securelevel > 0 || kernel_mem_readonly) return EPERM; lf = linker_find_file_by_name(filename); if (lf) { KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename)); *result = lf; lf->refs++; goto out; } lf = NULL; foundfile = 0; TAILQ_FOREACH(lc, &classes, link) { KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n", filename, lc->desc)); error = lc->ops->load_file(filename, &lf); /* * If we got something other than ENOENT, then it exists but we cannot * load it for some other reason. */ if (error != ENOENT) foundfile = 1; if (lf) { error = linker_file_register_modules(lf); if (error == EEXIST) { linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */); return (error); } linker_file_register_sysctls(lf); linker_file_sysinit(lf); lf->flags |= LINKER_FILE_LINKED; *result = lf; return (0); } } /* * Less than ideal, but tells the user whether it failed to load or * the module was not found. */ if (foundfile) { /* * If the file type has not been recognized by the last try * printout a message before to fail. */ if (error == ENOSYS) kprintf("linker_load_file: Unsupported file type\n"); /* * Format not recognized or otherwise unloadable. * When loading a module that is statically built into * the kernel EEXIST percolates back up as the return * value. Preserve this so that apps can recognize this * special case. */ if (error != EEXIST) error = ENOEXEC; } else { error = ENOENT; /* Nothing found */ } out: return error; } linker_file_t linker_find_file_by_name(const char* filename) { linker_file_t lf = NULL; char *koname; int i; for (i = strlen(filename); i > 0 && filename[i-1] != '/'; --i) ; filename += i; koname = kmalloc(strlen(filename) + 4, M_LINKER, M_WAITOK); ksprintf(koname, "%s.ko", filename); lockmgr(&llf_lock, LK_SHARED); TAILQ_FOREACH(lf, &linker_files, link) { if (!strcmp(lf->filename, koname)) break; if (!strcmp(lf->filename, filename)) break; } lockmgr(&llf_lock, LK_RELEASE); if (koname) kfree(koname, M_LINKER); return lf; } linker_file_t linker_find_file_by_id(int fileid) { linker_file_t lf = NULL; lockmgr(&llf_lock, LK_SHARED); TAILQ_FOREACH(lf, &linker_files, link) { if (lf->id == fileid) break; } lockmgr(&llf_lock, LK_RELEASE); return lf; } int linker_file_foreach(linker_predicate_t *predicate, void *context) { linker_file_t lf; int retval = 0; lockmgr(&llf_lock, LK_SHARED); TAILQ_FOREACH(lf, &linker_files, link) { retval = predicate(lf, context); if (retval != 0) break; } lockmgr(&llf_lock, LK_RELEASE); return (retval); } linker_file_t linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops) { linker_file_t lf = NULL; const char *filename; filename = linker_basename(pathname); KLD_DPF(FILE, ("linker_make_file: new file, filename=%s, pathname=%s\n", filename, pathname)); lockmgr(&llf_lock, LK_EXCLUSIVE); lf = kmalloc(sizeof(struct linker_file), M_LINKER, M_WAITOK | M_ZERO); lf->refs = 1; lf->userrefs = 0; lf->flags = 0; lf->filename = linker_strdup(filename); lf->pathname = linker_strdup(pathname); lf->id = next_file_id++; lf->ndeps = 0; lf->deps = NULL; STAILQ_INIT(&lf->common); TAILQ_INIT(&lf->modules); lf->priv = priv; lf->ops = ops; TAILQ_INSERT_TAIL(&linker_files, lf, link); lockmgr(&llf_lock, LK_RELEASE); return lf; } int linker_file_unload(linker_file_t file) { module_t mod, next; modlist_t ml, nextml; struct common_symbol* cp; int error = 0; int i; /* Refuse to unload modules if securelevel raised */ if (securelevel > 0 || kernel_mem_readonly) return EPERM; KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); lockmgr(&llf_lock, LK_EXCLUSIVE); /* Easy case of just dropping a reference. */ if (file->refs > 1) { file->refs--; lockmgr(&llf_lock, LK_RELEASE); return (0); } KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n")); /* * Inform any modules associated with this file. */ mod = TAILQ_FIRST(&file->modules); for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { next = module_getfnext(mod); /* * Give the module a chance to veto the unload. Note that the * act of unloading the module may cause other modules in the * same file list to be unloaded recursively. */ if ((error = module_unload(mod)) != 0) { KLD_DPF(FILE, ("linker_file_unload: module %p vetoes unload\n", mod)); lockmgr(&llf_lock, LK_RELEASE); file->refs--; goto out; } module_release(mod); } TAILQ_FOREACH_MUTABLE(ml, &found_modules, link, nextml) { if (ml->container == file) { TAILQ_REMOVE(&found_modules, ml, link); kfree(ml, M_LINKER); } } /* Don't try to run SYSUNINITs if we are unloaded due to a link error */ if (file->flags & LINKER_FILE_LINKED) { file->flags &= ~LINKER_FILE_LINKED; lockmgr(&llf_lock, LK_RELEASE); linker_file_sysuninit(file); linker_file_unregister_sysctls(file); lockmgr(&llf_lock, LK_EXCLUSIVE); } TAILQ_REMOVE(&linker_files, file, link); if (file->deps) { lockmgr(&llf_lock, LK_RELEASE); for (i = 0; i < file->ndeps; i++) linker_file_unload(file->deps[i]); lockmgr(&llf_lock, LK_EXCLUSIVE); kfree(file->deps, M_LINKER); file->deps = NULL; } while ((cp = STAILQ_FIRST(&file->common)) != NULL) { STAILQ_REMOVE_HEAD(&file->common, link); kfree(cp, M_LINKER); } file->ops->unload(file); if (file->filename) { kfree(file->filename, M_LINKER); file->filename = NULL; } if (file->pathname) { kfree(file->pathname, M_LINKER); file->pathname = NULL; } kfree(file, M_LINKER); lockmgr(&llf_lock, LK_RELEASE); out: return error; } void linker_file_add_dependancy(linker_file_t file, linker_file_t dep) { linker_file_t* newdeps; newdeps = kmalloc((file->ndeps + 1) * sizeof(linker_file_t*), M_LINKER, M_WAITOK | M_ZERO); if (file->deps) { bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*)); kfree(file->deps, M_LINKER); } file->deps = newdeps; file->deps[file->ndeps] = dep; file->ndeps++; } /* * Locate a linker set and its contents. * This is a helper function to avoid linker_if.h exposure elsewhere. * Note: firstp and lastp are really void *** */ int linker_file_lookup_set(linker_file_t file, const char *name, void *firstp, void *lastp, int *countp) { return file->ops->lookup_set(file, name, firstp, lastp, countp); } int linker_file_lookup_symbol(linker_file_t file, const char* name, int deps, caddr_t *raddr) { c_linker_sym_t sym; linker_symval_t symval; linker_file_t lf; size_t common_size = 0; int i; KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n", file, name, deps)); if (file->ops->lookup_symbol(file, name, &sym) == 0) { file->ops->symbol_values(file, sym, &symval); /* * XXX Assume a common symbol if its value is 0 and it has a non-zero * size, otherwise it could be an absolute symbol with a value of 0. */ if (symval.value == NULL && symval.size != 0) { /* * For commons, first look them up in the dependancies and * only allocate space if not found there. */ common_size = symval.size; } else { KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%p\n", symval.value)); *raddr = symval.value; return 0; } } if (deps) { for (i = 0; i < file->ndeps; i++) { if (linker_file_lookup_symbol(file->deps[i], name, 0, raddr) == 0) { KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%p\n", *raddr)); return 0; } } /* If we have not found it in the dependencies, search globally */ TAILQ_FOREACH(lf, &linker_files, link) { /* But skip the current file if it's on the list */ if (lf == file) continue; /* And skip the files we searched above */ for (i = 0; i < file->ndeps; i++) if (lf == file->deps[i]) break; if (i < file->ndeps) continue; if (linker_file_lookup_symbol(lf, name, 0, raddr) == 0) { KLD_DPF(SYM, ("linker_file_lookup_symbol: global value=%p\n", *raddr)); return 0; } } } if (common_size > 0) { /* * This is a common symbol which was not found in the * dependancies. We maintain a simple common symbol table in * the file object. */ struct common_symbol* cp; STAILQ_FOREACH(cp, &file->common, link) if (!strcmp(cp->name, name)) { KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%p\n", cp->address)); *raddr = cp->address; return 0; } /* * Round the symbol size up to align. */ common_size = (common_size + sizeof(int) - 1) & -sizeof(int); cp = kmalloc(sizeof(struct common_symbol) + common_size + strlen(name) + 1, M_LINKER, M_WAITOK | M_ZERO); cp->address = (caddr_t) (cp + 1); cp->name = cp->address + common_size; strcpy(cp->name, name); bzero(cp->address, common_size); STAILQ_INSERT_TAIL(&file->common, cp, link); KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%p\n", cp->address)); *raddr = cp->address; return 0; } #ifdef _KERNEL_VIRTUAL *raddr = dlsym(RTLD_NEXT, name); if (*raddr != NULL) { KLD_DPF(SYM, ("linker_file_lookup_symbol: found dlsym=%p\n", *raddr)); return 0; } #endif KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); return ENOENT; } #ifdef DDB /* * DDB Helpers. DDB has to look across multiple files with their own * symbol tables and string tables. * * Note that we do not obey list locking protocols here. We really don't * need DDB to hang because somebody's got the lock held. We'll take the * chance that the files list is inconsistant instead. */ int linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) { linker_file_t lf; TAILQ_FOREACH(lf, &linker_files, link) { if (lf->ops->lookup_symbol(lf, symstr, sym) == 0) return 0; } return ENOENT; } int linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) { linker_file_t lf; u_long off = (uintptr_t)value; u_long diff, bestdiff; c_linker_sym_t best; c_linker_sym_t es; best = NULL; bestdiff = off; TAILQ_FOREACH(lf, &linker_files, link) { if (lf->ops->search_symbol(lf, value, &es, &diff) != 0) continue; if (es != NULL && diff < bestdiff) { best = es; bestdiff = diff; } if (bestdiff == 0) break; } if (best) { *sym = best; *diffp = bestdiff; return 0; } else { *sym = NULL; *diffp = off; return ENOENT; } } int linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) { linker_file_t lf; TAILQ_FOREACH(lf, &linker_files, link) { if (lf->ops->symbol_values(lf, sym, symval) == 0) return 0; } return ENOENT; } #endif /* * Syscalls. * * MPALMOSTSAFE */ int sys_kldload(struct sysmsg *sysmsg, const struct kldload_args *uap) { char *file; char *kldname, *modname; linker_file_t lf; int error = 0; sysmsg->sysmsg_result = -1; if (securelevel > 0 || kernel_mem_readonly) /* redundant, but that's OK */ return EPERM; if ((error = caps_priv_check_self(SYSCAP_NOKLD)) != 0) return error; file = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); if ((error = copyinstr(uap->file, file, MAXPATHLEN, NULL)) != 0) goto out; /* * If file does not contain a qualified name or any dot in it * (kldname.ko, or kldname.ver.ko) treat it as an interface * name. */ if (strchr(file, '/') || strchr(file, '.')) { kldname = file; modname = NULL; } else { kldname = NULL; modname = file; } lockmgr(&kld_lock, LK_EXCLUSIVE); error = linker_load_module(kldname, modname, NULL, NULL, &lf); lockmgr(&kld_lock, LK_RELEASE); if (error) goto out; lf->userrefs++; sysmsg->sysmsg_result = lf->id; out: if (file) kfree(file, M_TEMP); return error; } /* * MPALMOSTSAFE */ int sys_kldunload(struct sysmsg *sysmsg, const struct kldunload_args *uap) { linker_file_t lf; int error = 0; if (securelevel > 0 || kernel_mem_readonly) /* redundant, but that's OK */ return EPERM; if ((error = caps_priv_check_self(SYSCAP_NOKLD)) != 0) return error; lockmgr(&kld_lock, LK_EXCLUSIVE); lf = linker_find_file_by_id(uap->fileid); if (lf) { KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); if (lf->userrefs == 0) { kprintf("linkerunload: attempt to unload file that was loaded by the kernel\n"); error = EBUSY; goto out; } lf->userrefs--; error = linker_file_unload(lf); if (error) lf->userrefs++; } else { error = ENOENT; } out: lockmgr(&kld_lock, LK_RELEASE); return error; } /* * MPALMOSTSAFE */ int sys_kldfind(struct sysmsg *sysmsg, const struct kldfind_args *uap) { char *pathname; const char *filename; linker_file_t lf; int error; sysmsg->sysmsg_result = -1; pathname = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0) goto out; filename = linker_basename(pathname); lockmgr(&kld_lock, LK_EXCLUSIVE); lf = linker_find_file_by_name(filename); if (lf) sysmsg->sysmsg_result = lf->id; else error = ENOENT; lockmgr(&kld_lock, LK_RELEASE); out: if (pathname) kfree(pathname, M_TEMP); return error; } /* * MPALMOSTSAFE */ int sys_kldnext(struct sysmsg *sysmsg, const struct kldnext_args *uap) { linker_file_t lf; int error = 0; lockmgr(&kld_lock, LK_EXCLUSIVE); if (uap->fileid == 0) { lf = TAILQ_FIRST(&linker_files); } else { lf = linker_find_file_by_id(uap->fileid); if (lf == NULL) { error = ENOENT; goto out; } lf = TAILQ_NEXT(lf, link); } /* Skip partially loaded files. */ while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED)) { lf = TAILQ_NEXT(lf, link); } if (lf) sysmsg->sysmsg_result = lf->id; else sysmsg->sysmsg_result = 0; out: lockmgr(&kld_lock, LK_RELEASE); return error; } /* * MPALMOSTSAFE */ int sys_kldstat(struct sysmsg *sysmsg, const struct kldstat_args *uap) { linker_file_t lf; int error = 0; int version; struct kld_file_stat* stat; int namelen; lockmgr(&kld_lock, LK_EXCLUSIVE); lf = linker_find_file_by_id(uap->fileid); if (!lf) { error = ENOENT; goto out; } stat = uap->stat; /* * Check the version of the user's structure. */ if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) goto out; if (version != sizeof(struct kld_file_stat)) { error = EINVAL; goto out; } namelen = strlen(lf->filename) + 1; if (namelen > MAXPATHLEN) namelen = MAXPATHLEN; if ((error = copyout(lf->filename, stat->name, namelen)) != 0) goto out; namelen = strlen(lf->pathname) + 1; if (namelen > MAXPATHLEN) namelen = MAXPATHLEN; if ((error = copyout(lf->pathname, stat->pathname, namelen)) != 0) goto out; if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) goto out; if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) goto out; if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0) goto out; if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) goto out; sysmsg->sysmsg_result = 0; out: lockmgr(&kld_lock, LK_RELEASE); return error; } /* * MPALMOSTSAFE */ int sys_kldfirstmod(struct sysmsg *sysmsg, const struct kldfirstmod_args *uap) { linker_file_t lf; int error = 0; lockmgr(&kld_lock, LK_EXCLUSIVE); lf = linker_find_file_by_id(uap->fileid); if (lf) { if (TAILQ_FIRST(&lf->modules)) sysmsg->sysmsg_result = module_getid(TAILQ_FIRST(&lf->modules)); else sysmsg->sysmsg_result = 0; } else { error = ENOENT; } lockmgr(&kld_lock, LK_RELEASE); return error; } /* * MPALMOSTSAFE */ int sys_kldsym(struct sysmsg *sysmsg, const struct kldsym_args *uap) { char *symstr = NULL; c_linker_sym_t sym; linker_symval_t symval; linker_file_t lf; struct kld_sym_lookup lookup; int error = 0; lockmgr(&kld_lock, LK_EXCLUSIVE); if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0) goto out; if (lookup.version != sizeof(lookup) || uap->cmd != KLDSYM_LOOKUP) { error = EINVAL; goto out; } symstr = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK); if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) goto out; if (uap->fileid != 0) { lf = linker_find_file_by_id(uap->fileid); if (lf == NULL) { error = ENOENT; goto out; } if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && lf->ops->symbol_values(lf, sym, &symval) == 0) { lookup.symvalue = (uintptr_t)symval.value; lookup.symsize = symval.size; error = copyout(&lookup, uap->data, sizeof(lookup)); } else error = ENOENT; } else { TAILQ_FOREACH(lf, &linker_files, link) { if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 && lf->ops->symbol_values(lf, sym, &symval) == 0) { lookup.symvalue = (uintptr_t)symval.value; lookup.symsize = symval.size; error = copyout(&lookup, uap->data, sizeof(lookup)); break; } } if (!lf) error = ENOENT; } out: lockmgr(&kld_lock, LK_RELEASE); if (symstr) kfree(symstr, M_TEMP); return error; } /* * Preloaded module support */ static modlist_t modlist_lookup(const char *name, int ver) { modlist_t mod; TAILQ_FOREACH(mod, &found_modules, link) { if (strcmp(mod->name, name) == 0 && (ver == 0 || mod->version == ver)) return (mod); } return (NULL); } static modlist_t modlist_lookup2(const char *name, struct mod_depend *verinfo) { modlist_t mod, bestmod; int ver; if (verinfo == NULL) return (modlist_lookup(name, 0)); bestmod = NULL; TAILQ_FOREACH(mod, &found_modules, link) { if (strcmp(mod->name, name) != 0) continue; ver = mod->version; if (ver == verinfo->md_ver_preferred) return (mod); if (ver >= verinfo->md_ver_minimum && ver <= verinfo->md_ver_maximum && (bestmod == NULL || ver > bestmod->version)) bestmod = mod; } return (bestmod); } int linker_reference_module(const char *modname, struct mod_depend *verinfo, linker_file_t *result) { modlist_t mod; int error; lockmgr(&llf_lock, LK_SHARED); if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { *result = mod->container; (*result)->refs++; lockmgr(&llf_lock, LK_RELEASE); return (0); } lockmgr(&llf_lock, LK_RELEASE); /*lockmgr(&kld_lock, LK_EXCLUSIVE);*/ error = linker_load_module(NULL, modname, NULL, verinfo, result); /*lockmgr(&kld_lock, LK_RELEASE);*/ return (error); } int linker_release_module(const char *modname, struct mod_depend *verinfo, linker_file_t lf) { modlist_t mod; int error; lockmgr(&llf_lock, LK_SHARED); if (lf == NULL) { KASSERT(modname != NULL, ("linker_release_module: no file or name")); mod = modlist_lookup2(modname, verinfo); if (mod == NULL) { lockmgr(&llf_lock, LK_RELEASE); return (ESRCH); } lf = mod->container; } else KASSERT(modname == NULL && verinfo == NULL, ("linker_release_module: both file and name")); lockmgr(&llf_lock, LK_RELEASE); /*lockmgr(&kld_lock, LK_EXCLUSIVE);*/ error = linker_file_unload(lf); /*lockmgr(&kld_lock, LK_RELEASE);*/ return (error); } static modlist_t modlist_newmodule(const char *modname, int version, linker_file_t container) { modlist_t mod; mod = kmalloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); if (mod == NULL) panic("no memory for module list"); mod->container = container; mod->name = modname; mod->version = version; TAILQ_INSERT_TAIL(&found_modules, mod, link); return (mod); } static void linker_addmodules(linker_file_t lf, struct mod_metadata **start, struct mod_metadata **stop, int preload) { struct mod_metadata *mp, **mdp; const char *modname; int ver; for (mdp = start; mdp < stop; mdp++) { mp = *mdp; if (mp->md_type != MDT_VERSION) continue; modname = mp->md_cval; ver = ((struct mod_version *)mp->md_data)->mv_version; if (modlist_lookup(modname, ver) != NULL) { kprintf("module %s already present!\n", modname); /* XXX what can we do? this is a build error. :-( */ continue; } modlist_newmodule(modname, ver, lf); } } static void linker_preload(void* arg) { caddr_t modptr; const char *modname, *nmodname; char *modtype; linker_file_t lf, nlf; linker_class_t lc; int error; linker_file_list_t loaded_files; linker_file_list_t depended_files; struct mod_metadata *mp, *nmp; struct mod_metadata **start, **stop, **mdp, **nmdp; struct mod_depend *verinfo; int nver; int resolves; modlist_t mod; struct sysinit **si_start, **si_stop; TAILQ_INIT(&loaded_files); TAILQ_INIT(&depended_files); TAILQ_INIT(&found_modules); modptr = NULL; while ((modptr = preload_search_next_name(modptr)) != NULL) { modname = (char *)preload_search_info(modptr, MODINFO_NAME); modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); if (modname == NULL) { kprintf("Preloaded module at %p does not have a name!\n", modptr); continue; } if (modtype == NULL) { kprintf("Preloaded module at %p does not have a type!\n", modptr); continue; } if (bootverbose) kprintf("Preloaded %s \"%s\" at %p.\n", modtype, modname, modptr); lf = NULL; TAILQ_FOREACH(lc, &classes, link) { error = lc->ops->preload_file(modname, &lf); if (!error) break; lf = NULL; } if (lf) TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); } /* * First get a list of stuff in the kernel. */ if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, &stop, NULL) == 0) linker_addmodules(linker_kernel_file, start, stop, 1); /* * This is a once-off kinky bubble sort to resolve relocation * dependency requirements. */ restart: TAILQ_FOREACH(lf, &loaded_files, loaded) { error = linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL); /* * First, look to see if we would successfully link with this * stuff. */ resolves = 1; /* unless we know otherwise */ if (!error) { for (mdp = start; mdp < stop; mdp++) { mp = *mdp; if (mp->md_type != MDT_DEPEND) continue; modname = mp->md_cval; verinfo = mp->md_data; for (nmdp = start; nmdp < stop; nmdp++) { nmp = *nmdp; if (nmp->md_type != MDT_VERSION) continue; nmodname = nmp->md_cval; if (strcmp(modname, nmodname) == 0) break; } if (nmdp < stop)/* it's a self reference */ continue; /* * ok, the module isn't here yet, we * are not finished */ if (modlist_lookup2(modname, verinfo) == NULL) resolves = 0; } } /* * OK, if we found our modules, we can link. So, "provide" * the modules inside and add it to the end of the link order * list. */ if (resolves) { if (!error) { for (mdp = start; mdp < stop; mdp++) { mp = *mdp; if (mp->md_type != MDT_VERSION) continue; modname = mp->md_cval; nver = ((struct mod_version *)mp->md_data)->mv_version; if (modlist_lookup(modname, nver) != NULL) { kprintf("module %s already present!\n", modname); TAILQ_REMOVE(&loaded_files, lf, loaded); linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ ); /* we changed tailq next ptr */ goto restart; } modlist_newmodule(modname, nver, lf); } } TAILQ_REMOVE(&loaded_files, lf, loaded); TAILQ_INSERT_TAIL(&depended_files, lf, loaded); /* * Since we provided modules, we need to restart the * sort so that the previous files that depend on us * have a chance. Also, we've busted the tailq next * pointer with the REMOVE. */ goto restart; } } /* * At this point, we check to see what could not be resolved.. */ while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) { TAILQ_REMOVE(&loaded_files, lf, loaded); kprintf("KLD file %s is missing dependencies\n", lf->filename); linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */ ); } /* * We made it. Finish off the linking in the order we determined. */ TAILQ_FOREACH_MUTABLE(lf, &depended_files, loaded, nlf) { if (linker_kernel_file) { linker_kernel_file->refs++; linker_file_add_dependancy(lf, linker_kernel_file); } lf->userrefs++; error = linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL); if (!error) { for (mdp = start; mdp < stop; mdp++) { mp = *mdp; if (mp->md_type != MDT_DEPEND) continue; modname = mp->md_cval; verinfo = mp->md_data; mod = modlist_lookup2(modname, verinfo); /* Don't count self-dependencies */ if (lf == mod->container) continue; mod->container->refs++; linker_file_add_dependancy(lf, mod->container); } } /* * Now do relocation etc using the symbol search paths * established by the dependencies */ error = lf->ops->preload_finish(lf); if (error) { TAILQ_REMOVE(&depended_files, lf, loaded); kprintf("KLD file %s - could not finalize loading\n", lf->filename); linker_file_unload(lf /* , LINKER_UNLOAD_FORCE */); continue; } linker_file_register_modules(lf); if (linker_file_lookup_set(lf, "sysinit_set", &si_start, &si_stop, NULL) == 0) sysinit_add(si_start, si_stop); linker_file_register_sysctls(lf); lf->flags |= LINKER_FILE_LINKED; } /* woohoo! we made it! */ } SYSINIT(preload, SI_BOOT2_KLD, SI_ORDER_MIDDLE, linker_preload, 0); /* * Search for a not-loaded module by name. * * Modules may be found in the following locations: * * - preloaded (result is just the module name) * - on disk (result is full path to module) * * The search path can be manipulated via sysctl. Note that we use the ';' * character as a separator to be consistent with the bootloader. */ static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules.local"; SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, sizeof(linker_path), "module load search path"); TUNABLE_STR("module_path", linker_path, sizeof(linker_path)); char * linker_search_path(const char *name) { struct nlookupdata nd; char *cp, *ep, *result; char *buf, *retbuf, *freebuf; size_t name_len, prefix_len; size_t result_len; int sep; int error; enum vtype type; const char *exts[] = { "", ".ko", NULL }; const char **ext; /* already full path */ if (name[0] == '/') return linker_strdup(name); /* resolve to full path */ if (strchr(name, '/') != NULL) { result = NULL; /* adapted from sys___realpath() */ error = nlookup_init(&nd, name, UIO_SYSSPACE, NLC_FOLLOW); if (error == 0) { nd.nl_flags |= NLC_SHAREDLOCK; error = nlookup(&nd); } if (error == 0) { if (nd.nl_flags & NLC_NCPISLOCKED) { nd.nl_flags &= ~NLC_NCPISLOCKED; cache_unlock(&nd.nl_nch); } error = cache_fullpath(curproc, &nd.nl_nch, NULL, &retbuf, &freebuf, 0); if (error == 0) { result = linker_strdup(retbuf); kfree(freebuf, M_TEMP); } } nlookup_done(&nd); return (result); } /* traverse the linker path */ buf = kmalloc(MAXPATHLEN, M_LINKER, M_WAITOK); cp = linker_path; name_len = strlen(name); for (;;) { /* find the end of this component */ for (ep = cp; (*ep != 0) && (*ep != ';'); ep++) ; prefix_len = ep - cp; /* if this component doesn't end with a slash, add one */ if (ep == cp || *(ep - 1) != '/') sep = 1; else sep = 0; result = buf; strncpy(result, cp, prefix_len); if (sep) result[prefix_len++] = '/'; strcpy(result + prefix_len, name); result_len = strlen(result); for (ext = exts; *ext != NULL; ext++) { strcpy(result + result_len, *ext); /* * Attempt to open the file, and return the path if we succeed and it's * a regular file. */ error = nlookup_init(&nd, result, UIO_SYSSPACE, NLC_FOLLOW|NLC_LOCKVP); if (error == 0) error = vn_open(&nd, NULL, FREAD, 0); if (error == 0) { type = nd.nl_open_vp->v_type; if (type == VREG) { nlookup_done(&nd); return (result); } } nlookup_done(&nd); } if (*ep == 0) break; cp = ep + 1; } kfree(buf, M_LINKER); return(NULL); } /* * Find a file which contains given module and load it, if "parent" is not * NULL, register a reference to it. */ static int linker_load_module(const char *kldname, const char *modname, struct linker_file *parent, struct mod_depend *verinfo, struct linker_file **lfpp) { linker_file_t lfdep; const char *filename; char *pathname; int error; if (modname == NULL) { /* * We have to load KLD */ KASSERT(verinfo == NULL, ("linker_load_module: verinfo is not NULL")); pathname = linker_search_path(kldname); } else { if (modlist_lookup2(modname, verinfo) != NULL) return (EEXIST); if (kldname != NULL) { pathname = linker_strdup(kldname); } else if (rootvnode == NULL) { pathname = NULL; } else { pathname = linker_search_path(modname); } #if 0 /* * Need to find a KLD with required module */ pathname = linker_search_module(modname, strlen(modname), verinfo); #endif } if (pathname == NULL) return (ENOENT); /* * Can't load more than one file with the same basename XXX: * Actually it should be possible to have multiple KLDs with * the same basename but different path because they can * provide different versions of the same modules. */ filename = linker_basename(pathname); if (linker_find_file_by_name(filename)) error = EEXIST; else do { error = linker_load_file(pathname, &lfdep); if (error) break; if (modname && verinfo && modlist_lookup2(modname, verinfo) == NULL) { linker_file_unload(lfdep /* , LINKER_UNLOAD_FORCE */ ); error = ENOENT; break; } if (parent) { linker_file_add_dependancy(parent, lfdep); } if (lfpp) *lfpp = lfdep; } while (0); kfree(pathname, M_LINKER); return (error); } /* * This routine is responsible for finding dependencies of userland initiated * kldload(2)'s of files. */ int linker_load_dependencies(linker_file_t lf) { linker_file_t lfdep; struct mod_metadata **start, **stop, **mdp, **nmdp; struct mod_metadata *mp, *nmp; struct mod_depend *verinfo; modlist_t mod; const char *modname, *nmodname; int ver, error = 0, count; /* * All files are dependant on /kernel. */ if (linker_kernel_file) { linker_kernel_file->refs++; linker_file_add_dependancy(lf, linker_kernel_file); } if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, &count) != 0) return (0); for (mdp = start; mdp < stop; mdp++) { mp = *mdp; if (mp->md_type != MDT_VERSION) continue; modname = mp->md_cval; ver = ((struct mod_version *)mp->md_data)->mv_version; mod = modlist_lookup(modname, ver); if (mod != NULL) { kprintf("interface %s.%d already present in the KLD '%s'!\n", modname, ver, mod->container->filename); return (EEXIST); } } for (mdp = start; mdp < stop; mdp++) { mp = *mdp; if (mp->md_type != MDT_DEPEND) continue; modname = mp->md_cval; verinfo = mp->md_data; nmodname = NULL; for (nmdp = start; nmdp < stop; nmdp++) { nmp = *nmdp; if (nmp->md_type != MDT_VERSION) continue; nmodname = nmp->md_cval; if (strcmp(modname, nmodname) == 0) break; } if (nmdp < stop) /* early exit, it's a self reference */ continue; mod = modlist_lookup2(modname, verinfo); if (mod) { /* woohoo, it's loaded already */ lfdep = mod->container; lfdep->refs++; linker_file_add_dependancy(lf, lfdep); continue; } error = linker_load_module(NULL, modname, lf, verinfo, NULL); if (error) { kprintf("KLD %s: depends on %s - not available or version mismatch\n", lf->filename, modname); break; } } if (error) return (error); linker_addmodules(lf, start, stop, 0); return (0); }