Implement dlsym(RTLD_NEXT, symbol).
This commit is contained in:
parent
8889c700f3
commit
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=27838
@ -27,7 +27,7 @@
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* $Id$
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* $Id: rtld.c,v 1.46 1997/02/22 15:46:48 peter Exp $
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*/
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*/
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#include <sys/param.h>
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#include <sys/param.h>
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@ -204,9 +204,10 @@ static int __dlclose __P((void *));
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static void *__dlsym __P((void *, char *));
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static void *__dlsym __P((void *, char *));
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static char *__dlerror __P((void));
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static char *__dlerror __P((void));
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static void __dlexit __P((void));
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static void __dlexit __P((void));
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static void *__dlsym3 __P((void *, char *, void *));
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static struct ld_entry ld_entry = {
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static struct ld_entry ld_entry = {
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__dlopen, __dlclose, __dlsym, __dlerror, __dlexit
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__dlopen, __dlclose, __dlsym, __dlerror, __dlexit, __dlsym3
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};
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};
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void xprintf __P((char *, ...));
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void xprintf __P((char *, ...));
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@ -411,7 +412,7 @@ struct _dynamic *dp;
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(void)close(crtp->crt_ldfd);
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(void)close(crtp->crt_ldfd);
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anon_close();
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anon_close();
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return LDSO_VERSION_HAS_DLEXIT;
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return LDSO_VERSION_HAS_DLSYM3;
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}
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}
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void
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void
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@ -1896,26 +1897,77 @@ __dlclose(fd)
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return 0;
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return 0;
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}
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}
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/*
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* This form of dlsym is obsolete. Current versions of crt0 don't call
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* it. It can still be called by old executables that were linked with
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* old versions of crt0.
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*/
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static void *
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static void *
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__dlsym(fd, sym)
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__dlsym(fd, sym)
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void *fd;
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void *fd;
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char *sym;
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char *sym;
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{
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{
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struct so_map *smp = (struct so_map *)fd, *src_map = NULL;
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if (fd == RTLD_NEXT) {
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generror("RTLD_NEXT not supported by this version of"
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" /usr/lib/crt0.o");
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return NULL;
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}
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return __dlsym3(fd, sym, NULL);
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}
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static void *
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__dlsym3(fd, sym, retaddr)
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void *fd;
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char *sym;
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void *retaddr;
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{
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struct so_map *smp;
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struct so_map *src_map;
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struct nzlist *np;
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struct nzlist *np;
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long addr;
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long addr;
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/*
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if (fd == RTLD_NEXT) {
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* Restrict search to passed map if dlopen()ed.
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/* Find the shared object that contains the caller. */
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*/
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for (smp = link_map_head; smp != NULL; smp = smp->som_next) {
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if (smp != NULL && LM_PRIVATE(smp)->spd_flags & RTLD_DL)
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void *textbase = smp->som_addr + LM_TXTADDR(smp);
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src_map = smp;
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void *textlimit = LM_ETEXT(smp);
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np = lookup(sym, &src_map, 1);
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if (textbase <= retaddr && retaddr < textlimit)
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if (np == NULL)
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break;
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}
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if (smp == NULL) {
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generror("Cannot determine caller's shared object");
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return NULL;
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}
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smp = smp->som_next;
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if (smp != NULL && LM_PRIVATE(smp)->spd_flags & RTLD_RTLD)
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smp = smp->som_next;
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if (smp == NULL) {
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generror("No next shared object for RTLD_NEXT");
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return NULL;
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}
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do {
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src_map = smp;
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np = lookup(sym, &src_map, 1);
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} while (np == NULL && (smp = smp->som_next) != NULL);
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} else {
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smp = (struct so_map *)fd;
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src_map = NULL;
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/*
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* Restrict search to passed map if dlopen()ed.
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*/
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if (smp != NULL && LM_PRIVATE(smp)->spd_flags & RTLD_DL)
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src_map = smp;
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np = lookup(sym, &src_map, 1);
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}
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if (np == NULL) {
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generror("Undefined symbol");
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return NULL;
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return NULL;
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}
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/* Fixup jmpslot so future calls transfer directly to target */
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addr = np->nz_value;
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addr = np->nz_value;
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if (src_map)
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if (src_map)
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addr += (long)src_map->som_addr;
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addr += (long)src_map->som_addr;
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@ -27,7 +27,7 @@
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* $Id: link.h,v 1.12 1997/05/07 02:26:34 eivind Exp $
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* $Id: link.h,v 1.13 1997/05/07 20:00:00 eivind Exp $
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*/
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*/
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/*
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/*
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@ -167,6 +167,7 @@ struct so_debug {
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*/
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*/
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#define LDSO_VERSION_NONE 0 /* FreeBSD2.0, 2.0.5 */
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#define LDSO_VERSION_NONE 0 /* FreeBSD2.0, 2.0.5 */
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#define LDSO_VERSION_HAS_DLEXIT 1 /* includes dlexit in ld_entry */
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#define LDSO_VERSION_HAS_DLEXIT 1 /* includes dlexit in ld_entry */
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#define LDSO_VERSION_HAS_DLSYM3 2 /* includes 3-argument dlsym */
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/*
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/*
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* Entry points into ld.so - user interface to the run-time linker.
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* Entry points into ld.so - user interface to the run-time linker.
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@ -179,6 +180,7 @@ struct ld_entry {
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void *(*dlsym) __P((void *, char *)); /* NONE */
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void *(*dlsym) __P((void *, char *)); /* NONE */
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char *(*dlerror) __P((void)); /* NONE */
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char *(*dlerror) __P((void)); /* NONE */
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void (*dlexit) __P((void)); /* HAS_DLEXIT */
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void (*dlexit) __P((void)); /* HAS_DLEXIT */
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void *(*dlsym3) __P((void *, char *, void *)); /* HAS_DLSYM3 */
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};
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};
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/*
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/*
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@ -27,7 +27,7 @@
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* $Id$
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* $Id: crt0.c,v 1.29 1997/02/22 14:57:44 peter Exp $
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*/
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*/
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#include <sys/param.h>
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#include <sys/param.h>
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@ -94,6 +94,8 @@ static char empty[1];
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char *__progname = empty;
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char *__progname = empty;
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char **environ;
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char **environ;
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static int ldso_version;
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extern unsigned char etext;
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extern unsigned char etext;
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extern unsigned char eprol asm ("eprol");
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extern unsigned char eprol asm ("eprol");
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extern start() asm("start");
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extern start() asm("start");
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@ -194,7 +196,6 @@ __do_dynamic_link ()
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struct exec hdr;
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struct exec hdr;
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char *ldso;
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char *ldso;
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int (*entry)();
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int (*entry)();
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int ret;
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#ifdef DEBUG
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#ifdef DEBUG
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/* Provision for alternate ld.so - security risk! */
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/* Provision for alternate ld.so - security risk! */
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@ -254,14 +255,14 @@ __do_dynamic_link ()
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crt.crt_ldentry = NULL;
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crt.crt_ldentry = NULL;
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entry = (int (*)())(crt.crt_ba + sizeof hdr);
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entry = (int (*)())(crt.crt_ba + sizeof hdr);
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ret = (*entry)(CRT_VERSION_BSD_4, &crt);
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ldso_version = (*entry)(CRT_VERSION_BSD_4, &crt);
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ld_entry = crt.crt_ldentry;
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ld_entry = crt.crt_ldentry;
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if (ret == -1 && ld_entry == NULL) {
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if (ldso_version == -1 && ld_entry == NULL) {
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/* if version 4 not recognised, try version 3 */
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/* if version 4 not recognised, try version 3 */
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ret = (*entry)(CRT_VERSION_BSD_3, &crt);
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ldso_version = (*entry)(CRT_VERSION_BSD_3, &crt);
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ld_entry = _DYNAMIC.d_entry;
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ld_entry = _DYNAMIC.d_entry;
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}
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}
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if (ret == -1) {
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if (ldso_version == -1) {
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_PUTMSG("ld.so failed");
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_PUTMSG("ld.so failed");
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if (ld_entry != NULL) {
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if (ld_entry != NULL) {
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char *msg = (ld_entry->dlerror)();
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char *msg = (ld_entry->dlerror)();
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@ -277,7 +278,7 @@ __do_dynamic_link ()
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}
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}
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if (ret >= LDSO_VERSION_HAS_DLEXIT)
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if (ldso_version >= LDSO_VERSION_HAS_DLEXIT)
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atexit(ld_entry->dlexit);
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atexit(ld_entry->dlexit);
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return;
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return;
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@ -316,7 +317,11 @@ char *name;
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if (ld_entry == NULL)
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if (ld_entry == NULL)
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return NULL;
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return NULL;
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return (ld_entry->dlsym)(fd, name);
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if (ldso_version >= LDSO_VERSION_HAS_DLSYM3) {
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void *retaddr = *(&fd - 1); /* XXX - ABI/machine dependent */
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return (ld_entry->dlsym3)(fd, name, retaddr);
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} else
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return (ld_entry->dlsym)(fd, name);
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}
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}
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@ -43,6 +43,13 @@
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#define RTLD_LAZY 1 /* Bind function calls lazily */
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#define RTLD_LAZY 1 /* Bind function calls lazily */
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#define RTLD_NOW 2 /* Bind function calls immediately */
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#define RTLD_NOW 2 /* Bind function calls immediately */
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/*
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* Special handle argument for dlsym(). It causes the search for the
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* symbol to begin in the next shared object after the one containing
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* the caller.
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*/
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#define RTLD_NEXT ((void *) -1)
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__BEGIN_DECLS
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__BEGIN_DECLS
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void *dlopen __P((char *, int));
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void *dlopen __P((char *, int));
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void *dlsym __P((void *, char *));
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void *dlsym __P((void *, char *));
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@ -152,6 +152,28 @@ returns a null pointer if the symbol cannot be found, and sets an error
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condition which may be queried with
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condition which may be queried with
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.Fn dlerror .
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.Fn dlerror .
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.Pp
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.Pp
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If
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.Fn dlsym
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is called with the special
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.Fa handle
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.Dv RTLD_NEXT ,
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then the search for the symbol is limited to the shared objects
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which were loaded after the one issuing the call to
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.Fn dlsym .
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Thus, if the function is called from the main program, all
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the shared libraries are searched.
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If it is called from a shared library, all subsequent shared
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libraries are searched.
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.Dv RTLD_NEXT
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is useful for implementing wrappers around library functions.
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For example, a wrapper function
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.Fn getpid
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could access the
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.Dq real
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.Fn getpid
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with
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.Li dlsym(RTLD_NEXT, \&"_getpid\&") .
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.Pp
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.Fn dlerror
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.Fn dlerror
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returns a null-terminated character string describing the last error that
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returns a null-terminated character string describing the last error that
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occurred during a call to
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occurred during a call to
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@ -27,7 +27,7 @@
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* $Id$
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* $Id: rtld.c,v 1.46 1997/02/22 15:46:48 peter Exp $
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*/
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*/
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#include <sys/param.h>
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#include <sys/param.h>
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@ -204,9 +204,10 @@ static int __dlclose __P((void *));
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static void *__dlsym __P((void *, char *));
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static void *__dlsym __P((void *, char *));
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static char *__dlerror __P((void));
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static char *__dlerror __P((void));
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static void __dlexit __P((void));
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static void __dlexit __P((void));
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static void *__dlsym3 __P((void *, char *, void *));
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static struct ld_entry ld_entry = {
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static struct ld_entry ld_entry = {
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__dlopen, __dlclose, __dlsym, __dlerror, __dlexit
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__dlopen, __dlclose, __dlsym, __dlerror, __dlexit, __dlsym3
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};
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};
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void xprintf __P((char *, ...));
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void xprintf __P((char *, ...));
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@ -411,7 +412,7 @@ struct _dynamic *dp;
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(void)close(crtp->crt_ldfd);
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(void)close(crtp->crt_ldfd);
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anon_close();
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anon_close();
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return LDSO_VERSION_HAS_DLEXIT;
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return LDSO_VERSION_HAS_DLSYM3;
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}
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}
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void
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void
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@ -1896,26 +1897,77 @@ __dlclose(fd)
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return 0;
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return 0;
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}
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}
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/*
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* This form of dlsym is obsolete. Current versions of crt0 don't call
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* it. It can still be called by old executables that were linked with
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* old versions of crt0.
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*/
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static void *
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static void *
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__dlsym(fd, sym)
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__dlsym(fd, sym)
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void *fd;
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void *fd;
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char *sym;
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char *sym;
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{
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{
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struct so_map *smp = (struct so_map *)fd, *src_map = NULL;
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if (fd == RTLD_NEXT) {
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generror("RTLD_NEXT not supported by this version of"
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" /usr/lib/crt0.o");
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return NULL;
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}
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return __dlsym3(fd, sym, NULL);
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}
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static void *
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__dlsym3(fd, sym, retaddr)
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void *fd;
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char *sym;
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void *retaddr;
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{
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struct so_map *smp;
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struct so_map *src_map;
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struct nzlist *np;
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struct nzlist *np;
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long addr;
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long addr;
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/*
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if (fd == RTLD_NEXT) {
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* Restrict search to passed map if dlopen()ed.
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/* Find the shared object that contains the caller. */
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*/
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for (smp = link_map_head; smp != NULL; smp = smp->som_next) {
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if (smp != NULL && LM_PRIVATE(smp)->spd_flags & RTLD_DL)
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void *textbase = smp->som_addr + LM_TXTADDR(smp);
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src_map = smp;
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void *textlimit = LM_ETEXT(smp);
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np = lookup(sym, &src_map, 1);
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if (textbase <= retaddr && retaddr < textlimit)
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if (np == NULL)
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break;
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}
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if (smp == NULL) {
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generror("Cannot determine caller's shared object");
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return NULL;
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}
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smp = smp->som_next;
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if (smp != NULL && LM_PRIVATE(smp)->spd_flags & RTLD_RTLD)
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smp = smp->som_next;
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if (smp == NULL) {
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generror("No next shared object for RTLD_NEXT");
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return NULL;
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}
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do {
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src_map = smp;
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||||||
|
np = lookup(sym, &src_map, 1);
|
||||||
|
} while (np == NULL && (smp = smp->som_next) != NULL);
|
||||||
|
} else {
|
||||||
|
smp = (struct so_map *)fd;
|
||||||
|
src_map = NULL;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Restrict search to passed map if dlopen()ed.
|
||||||
|
*/
|
||||||
|
if (smp != NULL && LM_PRIVATE(smp)->spd_flags & RTLD_DL)
|
||||||
|
src_map = smp;
|
||||||
|
|
||||||
|
np = lookup(sym, &src_map, 1);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (np == NULL) {
|
||||||
|
generror("Undefined symbol");
|
||||||
return NULL;
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
/* Fixup jmpslot so future calls transfer directly to target */
|
|
||||||
addr = np->nz_value;
|
addr = np->nz_value;
|
||||||
if (src_map)
|
if (src_map)
|
||||||
addr += (long)src_map->som_addr;
|
addr += (long)src_map->som_addr;
|
||||||
|
@ -27,7 +27,7 @@
|
|||||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||||||
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
*
|
*
|
||||||
* $Id: link.h,v 1.12 1997/05/07 02:26:34 eivind Exp $
|
* $Id: link.h,v 1.13 1997/05/07 20:00:00 eivind Exp $
|
||||||
*/
|
*/
|
||||||
|
|
||||||
/*
|
/*
|
||||||
@ -167,6 +167,7 @@ struct so_debug {
|
|||||||
*/
|
*/
|
||||||
#define LDSO_VERSION_NONE 0 /* FreeBSD2.0, 2.0.5 */
|
#define LDSO_VERSION_NONE 0 /* FreeBSD2.0, 2.0.5 */
|
||||||
#define LDSO_VERSION_HAS_DLEXIT 1 /* includes dlexit in ld_entry */
|
#define LDSO_VERSION_HAS_DLEXIT 1 /* includes dlexit in ld_entry */
|
||||||
|
#define LDSO_VERSION_HAS_DLSYM3 2 /* includes 3-argument dlsym */
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Entry points into ld.so - user interface to the run-time linker.
|
* Entry points into ld.so - user interface to the run-time linker.
|
||||||
@ -179,6 +180,7 @@ struct ld_entry {
|
|||||||
void *(*dlsym) __P((void *, char *)); /* NONE */
|
void *(*dlsym) __P((void *, char *)); /* NONE */
|
||||||
char *(*dlerror) __P((void)); /* NONE */
|
char *(*dlerror) __P((void)); /* NONE */
|
||||||
void (*dlexit) __P((void)); /* HAS_DLEXIT */
|
void (*dlexit) __P((void)); /* HAS_DLEXIT */
|
||||||
|
void *(*dlsym3) __P((void *, char *, void *)); /* HAS_DLSYM3 */
|
||||||
};
|
};
|
||||||
|
|
||||||
/*
|
/*
|
||||||
|
@ -27,7 +27,7 @@
|
|||||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||||||
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
*
|
*
|
||||||
* $Id: link.h,v 1.12 1997/05/07 02:26:34 eivind Exp $
|
* $Id: link.h,v 1.13 1997/05/07 20:00:00 eivind Exp $
|
||||||
*/
|
*/
|
||||||
|
|
||||||
/*
|
/*
|
||||||
@ -167,6 +167,7 @@ struct so_debug {
|
|||||||
*/
|
*/
|
||||||
#define LDSO_VERSION_NONE 0 /* FreeBSD2.0, 2.0.5 */
|
#define LDSO_VERSION_NONE 0 /* FreeBSD2.0, 2.0.5 */
|
||||||
#define LDSO_VERSION_HAS_DLEXIT 1 /* includes dlexit in ld_entry */
|
#define LDSO_VERSION_HAS_DLEXIT 1 /* includes dlexit in ld_entry */
|
||||||
|
#define LDSO_VERSION_HAS_DLSYM3 2 /* includes 3-argument dlsym */
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Entry points into ld.so - user interface to the run-time linker.
|
* Entry points into ld.so - user interface to the run-time linker.
|
||||||
@ -179,6 +180,7 @@ struct ld_entry {
|
|||||||
void *(*dlsym) __P((void *, char *)); /* NONE */
|
void *(*dlsym) __P((void *, char *)); /* NONE */
|
||||||
char *(*dlerror) __P((void)); /* NONE */
|
char *(*dlerror) __P((void)); /* NONE */
|
||||||
void (*dlexit) __P((void)); /* HAS_DLEXIT */
|
void (*dlexit) __P((void)); /* HAS_DLEXIT */
|
||||||
|
void *(*dlsym3) __P((void *, char *, void *)); /* HAS_DLSYM3 */
|
||||||
};
|
};
|
||||||
|
|
||||||
/*
|
/*
|
||||||
|
Loading…
Reference in New Issue
Block a user