From 513df600f4396f2e212a3c9216d820e49bf0b7c4 Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Thu, 8 Aug 2002 04:29:47 +0000 Subject: Cleanup to avoid some undefined behavior -Erik --- ldso/libdl/dlib.c | 75 +++++++++++++++++++++++++++--------------------------- ldso/libdl/libdl.c | 75 +++++++++++++++++++++++++++--------------------------- 2 files changed, 74 insertions(+), 76 deletions(-) (limited to 'ldso') diff --git a/ldso/libdl/dlib.c b/ldso/libdl/dlib.c index 82ec50943..118927dff 100644 --- a/ldso/libdl/dlib.c +++ b/ldso/libdl/dlib.c @@ -26,6 +26,39 @@ void *dlsym(void *, const char *) __attribute__ ((__weak__, __alias__ ("_dlsym") int dlclose(void *) __attribute__ ((__weak__, __alias__ ("_dlclose"))); int dladdr(void *, Dl_info *) __attribute__ ((__weak__, __alias__ ("_dladdr"))); +/* This is a real hack. We need access to the dynamic linker, but we +also need to make it possible to link against this library without any +unresolved externals. We provide these weak symbols to make the link +possible, but at run time the normal symbols are accessed. */ +static void __attribute__ ((unused)) foobar(void) +{ + const char msg[]="libdl library not correctly linked\n"; + _dl_write(2, msg, _dl_strlen(msg)); + _dl_exit(1); +} + +static int __attribute__ ((unused)) foobar1 = (int) foobar; /* Use as pointer */ +extern void _dl_dprintf(int, const char *, ...) __attribute__ ((__weak__, __alias__ ("foobar"))); +extern char *_dl_find_hash(char *, struct dyn_elf *, struct elf_resolve *, int) + __attribute__ ((__weak__, __alias__ ("foobar"))); +extern struct elf_resolve * _dl_load_shared_library(int, struct dyn_elf **, struct elf_resolve *, char *) + __attribute__ ((__weak__, __alias__ ("foobar"))); +extern int _dl_parse_relocation_information(struct elf_resolve *, unsigned long, unsigned long, int) + __attribute__ ((__weak__, __alias__ ("foobar"))); +extern void _dl_parse_lazy_relocation_information(struct elf_resolve *, unsigned long, unsigned long, int) + __attribute__ ((__weak__, __alias__ ("foobar"))); +#ifdef USE_CACHE +int _dl_map_cache(void) __attribute__ ((__weak__, __alias__ ("foobar"))); +int _dl_unmap_cache(void) __attribute__ ((__weak__, __alias__ ("foobar"))); +#endif + +extern struct dyn_elf *_dl_symbol_tables __attribute__ ((__weak__, __alias__ ("foobar1"))); +extern struct dyn_elf *_dl_handles __attribute__ ((__weak__, __alias__ ("foobar1"))); +extern struct elf_resolve *_dl_loaded_modules __attribute__ ((__weak__, __alias__ ("foobar1"))); +extern struct r_debug *_dl_debug_addr __attribute__ ((__weak__, __alias__ ("foobar1"))); +extern int _dl_error_number __attribute__ ((__weak__, __alias__ ("foobar1"))); +extern void *(*_dl_malloc_function)(size_t) __attribute__ ((__weak__, __alias__ ("foobar1"))); + static const char *dl_error_names[] = { "", "File not found", @@ -170,7 +203,7 @@ void *_dlopen(const char *libname, int flag) goto oops; } - dl_brk = (void (*)()) _dl_debug_addr->r_brk; + dl_brk = (void (*)(void)) _dl_debug_addr->r_brk; if (dl_brk != NULL) { _dl_debug_addr->r_state = RT_ADD; (*dl_brk) (); @@ -427,7 +460,7 @@ static int do_dlclose(void *vhandle, int need_fini) } - dl_brk = (void (*)()) _dl_debug_addr->r_brk; + dl_brk = (void (*)(void)) _dl_debug_addr->r_brk; if (dl_brk != NULL) { _dl_debug_addr->r_state = RT_DELETE; (*dl_brk) (); @@ -439,7 +472,7 @@ static int do_dlclose(void *vhandle, int need_fini) return 0; } -const char *_dlerror() +const char *_dlerror(void) { const char *retval; @@ -450,46 +483,12 @@ const char *_dlerror() return retval; } -/* This is a real hack. We need access to the dynamic linker, but we -also need to make it possible to link against this library without any -unresolved externals. We provide these weak symbols to make the link -possible, but at run time the normal symbols are accessed. */ - -static void __attribute__ ((unused)) foobar() -{ - _dl_dprintf(2, "libdl library not correctly linked\n"); - _dl_exit(1); -} - -static int __attribute__ ((unused)) foobar1 = (int) foobar; /* Use as pointer */ - -void _dl_dprintf(int, const char *, ...) __attribute__ ((__weak__, __alias__ ("foobar"))); -char *_dl_find_hash(char *, struct dyn_elf *, struct elf_resolve *, int) - __attribute__ ((__weak__, __alias__ ("foobar"))); -struct elf_resolve * _dl_load_shared_library(int, struct dyn_elf **, struct elf_resolve *, char *) - __attribute__ ((__weak__, __alias__ ("foobar"))); -int _dl_parse_relocation_information(struct elf_resolve *, unsigned long, unsigned long, int) - __attribute__ ((__weak__, __alias__ ("foobar"))); -void _dl_parse_lazy_relocation_information(struct elf_resolve *, unsigned long, unsigned long, int) - __attribute__ ((__weak__, __alias__ ("foobar"))); -#ifdef USE_CACHE -int _dl_map_cache(void) __attribute__ ((__weak__, __alias__ ("foobar"))); -int _dl_unmap_cache(void) __attribute__ ((__weak__, __alias__ ("foobar"))); -#endif - -extern struct dyn_elf *_dl_symbol_tables __attribute__ ((__weak__, __alias__ ("foobar1"))); -extern struct dyn_elf *_dl_handles __attribute__ ((__weak__, __alias__ ("foobar1"))); -extern struct elf_resolve *_dl_loaded_modules __attribute__ ((__weak__, __alias__ ("foobar1"))); -extern struct r_debug *_dl_debug_addr __attribute__ ((__weak__, __alias__ ("foobar1"))); -extern int _dl_error_number __attribute__ ((__weak__, __alias__ ("foobar1"))); -extern void *(*_dl_malloc_function)(size_t) __attribute__ ((__weak__, __alias__ ("foobar1"))); - /* * Dump information to stderrr about the current loaded modules */ static char *type[] = { "Lib", "Exe", "Int", "Mod" }; -void _dlinfo() +void _dlinfo(void) { struct elf_resolve *tpnt; struct dyn_elf *rpnt, *hpnt; diff --git a/ldso/libdl/libdl.c b/ldso/libdl/libdl.c index 82ec50943..118927dff 100644 --- a/ldso/libdl/libdl.c +++ b/ldso/libdl/libdl.c @@ -26,6 +26,39 @@ void *dlsym(void *, const char *) __attribute__ ((__weak__, __alias__ ("_dlsym") int dlclose(void *) __attribute__ ((__weak__, __alias__ ("_dlclose"))); int dladdr(void *, Dl_info *) __attribute__ ((__weak__, __alias__ ("_dladdr"))); +/* This is a real hack. We need access to the dynamic linker, but we +also need to make it possible to link against this library without any +unresolved externals. We provide these weak symbols to make the link +possible, but at run time the normal symbols are accessed. */ +static void __attribute__ ((unused)) foobar(void) +{ + const char msg[]="libdl library not correctly linked\n"; + _dl_write(2, msg, _dl_strlen(msg)); + _dl_exit(1); +} + +static int __attribute__ ((unused)) foobar1 = (int) foobar; /* Use as pointer */ +extern void _dl_dprintf(int, const char *, ...) __attribute__ ((__weak__, __alias__ ("foobar"))); +extern char *_dl_find_hash(char *, struct dyn_elf *, struct elf_resolve *, int) + __attribute__ ((__weak__, __alias__ ("foobar"))); +extern struct elf_resolve * _dl_load_shared_library(int, struct dyn_elf **, struct elf_resolve *, char *) + __attribute__ ((__weak__, __alias__ ("foobar"))); +extern int _dl_parse_relocation_information(struct elf_resolve *, unsigned long, unsigned long, int) + __attribute__ ((__weak__, __alias__ ("foobar"))); +extern void _dl_parse_lazy_relocation_information(struct elf_resolve *, unsigned long, unsigned long, int) + __attribute__ ((__weak__, __alias__ ("foobar"))); +#ifdef USE_CACHE +int _dl_map_cache(void) __attribute__ ((__weak__, __alias__ ("foobar"))); +int _dl_unmap_cache(void) __attribute__ ((__weak__, __alias__ ("foobar"))); +#endif + +extern struct dyn_elf *_dl_symbol_tables __attribute__ ((__weak__, __alias__ ("foobar1"))); +extern struct dyn_elf *_dl_handles __attribute__ ((__weak__, __alias__ ("foobar1"))); +extern struct elf_resolve *_dl_loaded_modules __attribute__ ((__weak__, __alias__ ("foobar1"))); +extern struct r_debug *_dl_debug_addr __attribute__ ((__weak__, __alias__ ("foobar1"))); +extern int _dl_error_number __attribute__ ((__weak__, __alias__ ("foobar1"))); +extern void *(*_dl_malloc_function)(size_t) __attribute__ ((__weak__, __alias__ ("foobar1"))); + static const char *dl_error_names[] = { "", "File not found", @@ -170,7 +203,7 @@ void *_dlopen(const char *libname, int flag) goto oops; } - dl_brk = (void (*)()) _dl_debug_addr->r_brk; + dl_brk = (void (*)(void)) _dl_debug_addr->r_brk; if (dl_brk != NULL) { _dl_debug_addr->r_state = RT_ADD; (*dl_brk) (); @@ -427,7 +460,7 @@ static int do_dlclose(void *vhandle, int need_fini) } - dl_brk = (void (*)()) _dl_debug_addr->r_brk; + dl_brk = (void (*)(void)) _dl_debug_addr->r_brk; if (dl_brk != NULL) { _dl_debug_addr->r_state = RT_DELETE; (*dl_brk) (); @@ -439,7 +472,7 @@ static int do_dlclose(void *vhandle, int need_fini) return 0; } -const char *_dlerror() +const char *_dlerror(void) { const char *retval; @@ -450,46 +483,12 @@ const char *_dlerror() return retval; } -/* This is a real hack. We need access to the dynamic linker, but we -also need to make it possible to link against this library without any -unresolved externals. We provide these weak symbols to make the link -possible, but at run time the normal symbols are accessed. */ - -static void __attribute__ ((unused)) foobar() -{ - _dl_dprintf(2, "libdl library not correctly linked\n"); - _dl_exit(1); -} - -static int __attribute__ ((unused)) foobar1 = (int) foobar; /* Use as pointer */ - -void _dl_dprintf(int, const char *, ...) __attribute__ ((__weak__, __alias__ ("foobar"))); -char *_dl_find_hash(char *, struct dyn_elf *, struct elf_resolve *, int) - __attribute__ ((__weak__, __alias__ ("foobar"))); -struct elf_resolve * _dl_load_shared_library(int, struct dyn_elf **, struct elf_resolve *, char *) - __attribute__ ((__weak__, __alias__ ("foobar"))); -int _dl_parse_relocation_information(struct elf_resolve *, unsigned long, unsigned long, int) - __attribute__ ((__weak__, __alias__ ("foobar"))); -void _dl_parse_lazy_relocation_information(struct elf_resolve *, unsigned long, unsigned long, int) - __attribute__ ((__weak__, __alias__ ("foobar"))); -#ifdef USE_CACHE -int _dl_map_cache(void) __attribute__ ((__weak__, __alias__ ("foobar"))); -int _dl_unmap_cache(void) __attribute__ ((__weak__, __alias__ ("foobar"))); -#endif - -extern struct dyn_elf *_dl_symbol_tables __attribute__ ((__weak__, __alias__ ("foobar1"))); -extern struct dyn_elf *_dl_handles __attribute__ ((__weak__, __alias__ ("foobar1"))); -extern struct elf_resolve *_dl_loaded_modules __attribute__ ((__weak__, __alias__ ("foobar1"))); -extern struct r_debug *_dl_debug_addr __attribute__ ((__weak__, __alias__ ("foobar1"))); -extern int _dl_error_number __attribute__ ((__weak__, __alias__ ("foobar1"))); -extern void *(*_dl_malloc_function)(size_t) __attribute__ ((__weak__, __alias__ ("foobar1"))); - /* * Dump information to stderrr about the current loaded modules */ static char *type[] = { "Lib", "Exe", "Int", "Mod" }; -void _dlinfo() +void _dlinfo(void) { struct elf_resolve *tpnt; struct dyn_elf *rpnt, *hpnt; -- cgit v1.2.3