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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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ldconfig: Retire a.out support
aout support in ldconfig hasn't been required since FreeBSD 2.x.
If someone needs to use FreeBSD 2 shared libraries they will be best
served by using a FreeBSD 2 ldconfig as well.
In aa5e1b42e6 we removed the ldconfig a.out invocation from rc.d but
left the support in ldconfig itself. Remove it now.
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D27481
This commit is contained in:
Ed Maste
parent
a3c29cdbd4
commit
50a40d0911
@ -2,11 +2,7 @@
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PACKAGE=runtime
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PROG= ldconfig
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SRCS= elfhints.c ldconfig.c shlib.c support.c
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LDDIR?= ${SRCTOP}/libexec/rtld-aout
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CFLAGS+=-I${LDDIR} -DFREEBSD_AOUT
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SRCS= elfhints.c ldconfig.c
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MAN= ldconfig.8
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.PATH: ${LDDIR}
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.include <bsd.prog.mk>
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@ -29,7 +29,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd March 17, 2020
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.Dd December 31, 2020
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.Dt LDCONFIG 8
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.Os
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.Sh NAME
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@ -38,7 +38,7 @@
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.Sh SYNOPSIS
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.Nm
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.Op Fl 32
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.Op Fl aout | Fl elf
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.Op Fl elf
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.Op Fl Rimrsv
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.Op Fl f Ar hints_file
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.Op Ar directory | Ar
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@ -109,12 +109,8 @@ The following options are recognized by
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.It Fl 32
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Generate the hints for 32-bit ABI shared libraries
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on 64-bit systems that support running 32-bit binaries.
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.It Fl aout
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Generate the hints for a.out format shared libraries.
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This option is deprecated and is not present in
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.Fx 13 .
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.It Fl elf
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Generate the hints for ELF format shared libraries.
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Ignored for backwards compatibility.
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.It Fl R
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Rescan the previously configured directories.
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This opens the previous hints
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@ -46,20 +46,15 @@ static const char rcsid[] =
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/link_aout.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "ldconfig.h"
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#include "shlib.h"
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#include "support.h"
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#if DEBUG
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/* test */
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#undef _PATH_LD_HINTS
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#define _PATH_LD_HINTS "./ld.so.hints"
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#undef _PATH_ELF_HINTS
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#define _PATH_ELF_HINTS "./ld-elf.so.hints"
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#endif
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@ -78,52 +73,19 @@ static int merge;
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static int rescan;
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static const char *hints_file;
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struct shlib_list {
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/* Internal list of shared libraries found */
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char *name;
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char *path;
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int dewey[MAXDEWEY];
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int ndewey;
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#define major dewey[0]
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#define minor dewey[1]
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struct shlib_list *next;
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};
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static struct shlib_list *shlib_head = NULL, **shlib_tail = &shlib_head;
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static char *dir_list;
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static int buildhints(void);
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static int dodir(char *, int);
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int dofile(char *, int);
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static void enter(char *, char *, char *, int *, int);
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static void listhints(void);
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static int readhints(void);
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static void usage(void);
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/*
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* Note on aout/a.out support.
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* To properly support shared libraries for compat2x, which are a.out, we need
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* to support a.out here. As of 2013, bug reports are still coming in for this
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* feature (on amd64 no less), so we know it is still in use.
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*/
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int
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main(int argc, char **argv)
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{
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int i, c;
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int rval = 0;
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int is_aout = 0;
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int c;
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int is_32 = 0;
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int is_soft = 0;
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while (argc > 1) {
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if (strcmp(argv[1], "-aout") == 0) {
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warnx("aout support is deprecated");
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is_aout = 1;
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argc--;
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argv++;
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errx(1, "aout is not supported");
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} else if (strcmp(argv[1], "-elf") == 0) {
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is_aout = 0;
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argc--;
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argv++;
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} else if (strcmp(argv[1], "-32") == 0) {
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@ -142,9 +104,9 @@ main(int argc, char **argv)
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if (is_soft)
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hints_file = _PATH_ELFSOFT_HINTS; /* Never will have a.out softfloat */
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else if (is_32)
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hints_file = is_aout ? _PATH_LD32_HINTS : _PATH_ELF32_HINTS;
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hints_file = _PATH_ELF32_HINTS;
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else
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hints_file = is_aout ? _PATH_LD_HINTS : _PATH_ELF_HINTS;
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hints_file = _PATH_ELF_HINTS;
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if (argc == 1)
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rescan = 1;
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else while((c = getopt(argc, argv, "Rf:imrsv")) != -1) {
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@ -176,469 +138,18 @@ main(int argc, char **argv)
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}
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}
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if (!is_aout) {
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if (justread)
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list_elf_hints(hints_file);
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else
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update_elf_hints(hints_file, argc - optind,
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argv + optind, merge || rescan);
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return 0;
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}
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/* Here begins the aout libs processing */
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dir_list = strdup("");
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if (justread || merge || rescan) {
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if ((rval = readhints()) != 0)
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return rval;
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}
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if (!nostd && !merge && !rescan)
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std_search_path();
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/* Add any directories/files from the command line */
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if (!justread) {
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for (i = optind; i < argc; i++) {
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struct stat stbuf;
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if (stat(argv[i], &stbuf) == -1) {
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warn("%s", argv[i]);
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rval = -1;
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} else if (strcmp(argv[i], "/usr/lib") == 0) {
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warnx("WARNING! '%s' can not be used", argv[i]);
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rval = -1;
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} else {
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/*
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* See if this is a directory-containing
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* file instead of a directory
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*/
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if (S_ISREG(stbuf.st_mode))
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rval |= dofile(argv[i], 0);
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else
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add_search_path(argv[i]);
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}
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}
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}
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for (i = 0; i < n_search_dirs; i++) {
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char *cp = concat(dir_list, *dir_list?":":"", search_dirs[i]);
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free(dir_list);
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dir_list = cp;
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}
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if (justread) {
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listhints();
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return 0;
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}
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for (i = 0; i < n_search_dirs; i++)
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rval |= dodir(search_dirs[i], 1);
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rval |= buildhints();
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return rval;
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if (justread)
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list_elf_hints(hints_file);
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else
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update_elf_hints(hints_file, argc - optind,
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argv + optind, merge || rescan);
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return 0;
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}
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static void
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usage(void)
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{
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fprintf(stderr,
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"usage: ldconfig [-32] [-aout | -elf] [-Rimrsv] [-f hints_file] [directory | file ...]\n");
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"usage: ldconfig [-32] [-elf] [-Rimrsv] [-f hints_file] [directory | file ...]\n");
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exit(1);
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}
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int
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dofile(char *fname, int silent)
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{
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FILE *hfp;
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char buf[MAXPATHLEN];
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int rval = 0;
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char *cp, *sp;
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if ((hfp = fopen(fname, "r")) == NULL) {
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warn("%s", fname);
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return -1;
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}
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while (fgets(buf, sizeof(buf), hfp)) {
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cp = buf;
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while (isspace(*cp))
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cp++;
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if (*cp == '#' || *cp == '\0')
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continue;
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sp = cp;
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while (!isspace(*cp) && *cp != '\0')
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cp++;
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if (*cp != '\n') {
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*cp = '\0';
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warnx("%s: trailing characters ignored", sp);
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}
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*cp = '\0';
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rval |= dodir(sp, silent);
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}
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(void)fclose(hfp);
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return rval;
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}
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int
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dodir(char *dir, int silent)
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{
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DIR *dd;
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struct dirent *dp;
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char name[MAXPATHLEN];
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int dewey[MAXDEWEY], ndewey;
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if ((dd = opendir(dir)) == NULL) {
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if (silent && errno == ENOENT) /* Ignore the error */
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return 0;
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warn("%s", dir);
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return -1;
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}
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while ((dp = readdir(dd)) != NULL) {
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int n;
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char *cp;
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/* Check for `lib' prefix */
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if (dp->d_name[0] != 'l' ||
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dp->d_name[1] != 'i' ||
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dp->d_name[2] != 'b')
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continue;
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/* Copy the entry minus prefix */
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(void)strcpy(name, dp->d_name + 3);
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n = strlen(name);
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if (n < 4)
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continue;
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/* Find ".so." in name */
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for (cp = name + n - 4; cp > name; --cp) {
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if (cp[0] == '.' &&
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cp[1] == 's' &&
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cp[2] == 'o' &&
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cp[3] == '.')
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break;
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}
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if (cp <= name)
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continue;
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*cp = '\0';
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if (!isdigit(*(cp+4)))
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continue;
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bzero((caddr_t)dewey, sizeof(dewey));
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ndewey = getdewey(dewey, cp + 4);
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if (ndewey < 2)
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continue;
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enter(dir, dp->d_name, name, dewey, ndewey);
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}
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closedir(dd);
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return 0;
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}
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static void
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enter(char *dir, char *file, char *name, int dewey[], int ndewey)
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{
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struct shlib_list *shp;
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for (shp = shlib_head; shp; shp = shp->next) {
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if (strcmp(name, shp->name) != 0 || major != shp->major)
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continue;
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/* Name matches existing entry */
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if (cmpndewey(dewey, ndewey, shp->dewey, shp->ndewey) > 0) {
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/* Update this entry with higher versioned lib */
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if (verbose)
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printf("Updating lib%s.%d.%d to %s/%s\n",
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shp->name, shp->major, shp->minor,
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dir, file);
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free(shp->name);
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shp->name = strdup(name);
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free(shp->path);
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shp->path = concat(dir, "/", file);
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bcopy(dewey, shp->dewey, sizeof(shp->dewey));
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shp->ndewey = ndewey;
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}
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break;
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}
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if (shp)
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/* Name exists: older version or just updated */
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return;
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/* Allocate new list element */
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if (verbose)
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printf("Adding %s/%s\n", dir, file);
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shp = (struct shlib_list *)xmalloc(sizeof *shp);
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shp->name = strdup(name);
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shp->path = concat(dir, "/", file);
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bcopy(dewey, shp->dewey, sizeof(shp->dewey));
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shp->ndewey = ndewey;
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shp->next = NULL;
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*shlib_tail = shp;
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shlib_tail = &shp->next;
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}
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static int
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hinthash(char *cp, int vmajor)
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{
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int k = 0;
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while (*cp)
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k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
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k = (((k << 1) + (k >> 14)) ^ (vmajor*257)) & 0x3fff;
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return k;
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}
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int
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buildhints(void)
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{
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struct hints_header hdr;
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struct hints_bucket *blist;
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struct shlib_list *shp;
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char *strtab;
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int i, n, str_index = 0;
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int strtab_sz = 0; /* Total length of strings */
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int nhints = 0; /* Total number of hints */
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int fd;
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char *tmpfilename;
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for (shp = shlib_head; shp; shp = shp->next) {
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strtab_sz += 1 + strlen(shp->name);
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strtab_sz += 1 + strlen(shp->path);
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nhints++;
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}
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/* Fill hints file header */
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hdr.hh_magic = HH_MAGIC;
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hdr.hh_version = LD_HINTS_VERSION_2;
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hdr.hh_nbucket = 1 * nhints;
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n = hdr.hh_nbucket * sizeof(struct hints_bucket);
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hdr.hh_hashtab = sizeof(struct hints_header);
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hdr.hh_strtab = hdr.hh_hashtab + n;
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hdr.hh_dirlist = strtab_sz;
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strtab_sz += 1 + strlen(dir_list);
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hdr.hh_strtab_sz = strtab_sz;
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hdr.hh_ehints = hdr.hh_strtab + hdr.hh_strtab_sz;
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if (verbose)
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printf("Totals: entries %d, buckets %ld, string size %d\n",
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nhints, (long)hdr.hh_nbucket, strtab_sz);
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/* Allocate buckets and string table */
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blist = (struct hints_bucket *)xmalloc(n);
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bzero((char *)blist, n);
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for (i = 0; i < hdr.hh_nbucket; i++)
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/* Empty all buckets */
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blist[i].hi_next = -1;
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strtab = (char *)xmalloc(strtab_sz);
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/* Enter all */
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for (shp = shlib_head; shp; shp = shp->next) {
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struct hints_bucket *bp;
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bp = blist +
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(hinthash(shp->name, shp->major) % hdr.hh_nbucket);
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if (bp->hi_pathx) {
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int j;
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for (j = 0; j < hdr.hh_nbucket; j++) {
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if (blist[j].hi_pathx == 0)
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break;
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}
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if (j == hdr.hh_nbucket) {
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warnx("bummer!");
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return -1;
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}
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while (bp->hi_next != -1)
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bp = &blist[bp->hi_next];
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bp->hi_next = j;
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bp = blist + j;
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}
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/* Insert strings in string table */
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bp->hi_namex = str_index;
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strcpy(strtab + str_index, shp->name);
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str_index += 1 + strlen(shp->name);
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bp->hi_pathx = str_index;
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strcpy(strtab + str_index, shp->path);
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str_index += 1 + strlen(shp->path);
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/* Copy versions */
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bcopy(shp->dewey, bp->hi_dewey, sizeof(bp->hi_dewey));
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bp->hi_ndewey = shp->ndewey;
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}
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/* Copy search directories */
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strcpy(strtab + str_index, dir_list);
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str_index += 1 + strlen(dir_list);
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/* Sanity check */
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if (str_index != strtab_sz) {
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errx(1, "str_index(%d) != strtab_sz(%d)", str_index, strtab_sz);
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}
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tmpfilename = concat(hints_file, ".XXXXXXXXXX", "");
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umask(0); /* Create with exact permissions */
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if ((fd = mkstemp(tmpfilename)) == -1) {
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warn("%s", tmpfilename);
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return -1;
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}
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fchmod(fd, 0444);
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if (write(fd, &hdr, sizeof(struct hints_header)) !=
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sizeof(struct hints_header)) {
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warn("%s", hints_file);
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return -1;
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}
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if (write(fd, blist, hdr.hh_nbucket * sizeof(*blist)) !=
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(ssize_t)(hdr.hh_nbucket * sizeof(*blist))) {
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warn("%s", hints_file);
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return -1;
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}
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if (write(fd, strtab, strtab_sz) != strtab_sz) {
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warn("%s", hints_file);
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return -1;
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}
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if (close(fd) != 0) {
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warn("%s", hints_file);
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return -1;
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}
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if (rename(tmpfilename, hints_file) != 0) {
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warn("%s", hints_file);
|
||||
return -1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
readhints(void)
|
||||
{
|
||||
int fd;
|
||||
void *addr;
|
||||
long fsize;
|
||||
long msize;
|
||||
struct hints_header *hdr;
|
||||
struct hints_bucket *blist;
|
||||
char *strtab;
|
||||
struct shlib_list *shp;
|
||||
int i;
|
||||
|
||||
if ((fd = open(hints_file, O_RDONLY, 0)) == -1) {
|
||||
warn("%s", hints_file);
|
||||
return -1;
|
||||
}
|
||||
|
||||
msize = PAGE_SIZE;
|
||||
addr = mmap(0, msize, PROT_READ, MAP_PRIVATE, fd, 0);
|
||||
|
||||
if (addr == MAP_FAILED) {
|
||||
warn("%s", hints_file);
|
||||
return -1;
|
||||
}
|
||||
|
||||
hdr = (struct hints_header *)addr;
|
||||
if (HH_BADMAG(*hdr)) {
|
||||
warnx("%s: bad magic: %lo", hints_file,
|
||||
(unsigned long)hdr->hh_magic);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (hdr->hh_version != LD_HINTS_VERSION_1 &&
|
||||
hdr->hh_version != LD_HINTS_VERSION_2) {
|
||||
warnx("unsupported version: %ld", (long)hdr->hh_version);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (hdr->hh_ehints > msize) {
|
||||
fsize = hdr->hh_ehints;
|
||||
munmap(addr, msize);
|
||||
addr = mmap(0, fsize, PROT_READ, MAP_PRIVATE, fd, 0);
|
||||
if (addr == MAP_FAILED) {
|
||||
warn("%s", hints_file);
|
||||
return -1;
|
||||
}
|
||||
hdr = (struct hints_header *)addr;
|
||||
}
|
||||
close(fd);
|
||||
|
||||
strtab = (char *)addr + hdr->hh_strtab;
|
||||
|
||||
if (hdr->hh_version >= LD_HINTS_VERSION_2)
|
||||
add_search_path(strtab + hdr->hh_dirlist);
|
||||
else if (rescan)
|
||||
errx(1, "%s too old and does not contain the search path",
|
||||
hints_file);
|
||||
|
||||
if (rescan)
|
||||
return 0;
|
||||
|
||||
blist = malloc(sizeof(*blist) * hdr->hh_nbucket);
|
||||
if (blist == NULL)
|
||||
err(1, "readhints");
|
||||
memcpy(blist, (char *)addr + hdr->hh_hashtab,
|
||||
sizeof(*blist) * hdr->hh_nbucket);
|
||||
|
||||
|
||||
for (i = 0; i < hdr->hh_nbucket; i++) {
|
||||
struct hints_bucket *bp = &blist[i];
|
||||
|
||||
/* Sanity check */
|
||||
if (bp->hi_namex >= hdr->hh_strtab_sz) {
|
||||
warnx("bad name index: %#x", bp->hi_namex);
|
||||
free(blist);
|
||||
return -1;
|
||||
}
|
||||
if (bp->hi_pathx >= hdr->hh_strtab_sz) {
|
||||
warnx("bad path index: %#x", bp->hi_pathx);
|
||||
free(blist);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Allocate new list element */
|
||||
shp = (struct shlib_list *)xmalloc(sizeof *shp);
|
||||
shp->name = strdup(strtab + bp->hi_namex);
|
||||
shp->path = strdup(strtab + bp->hi_pathx);
|
||||
bcopy(bp->hi_dewey, shp->dewey, sizeof(shp->dewey));
|
||||
shp->ndewey = bp->hi_ndewey;
|
||||
shp->next = NULL;
|
||||
|
||||
*shlib_tail = shp;
|
||||
shlib_tail = &shp->next;
|
||||
}
|
||||
|
||||
free(blist);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
listhints(void)
|
||||
{
|
||||
struct shlib_list *shp;
|
||||
int i;
|
||||
|
||||
printf("%s:\n", hints_file);
|
||||
printf("\tsearch directories: %s\n", dir_list);
|
||||
|
||||
for (i = 0, shp = shlib_head; shp; i++, shp = shp->next)
|
||||
printf("\t%d:-l%s.%d.%d => %s\n",
|
||||
i, shp->name, shp->major, shp->minor, shp->path);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user