git: e0dfecadf594 - main - ldconfig: support hints files of either byte-order
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Date: Wed, 28 Feb 2024 18:08:35 UTC
The branch main has been updated by se: URL: https://cgit.FreeBSD.org/src/commit/?id=e0dfecadf5946b6a8ad423be4eb1c14017b3a8a7 commit e0dfecadf5946b6a8ad423be4eb1c14017b3a8a7 Author: Stefan Eßer <se@FreeBSD.org> AuthorDate: 2024-02-28 17:49:29 +0000 Commit: Stefan Eßer <se@FreeBSD.org> CommitDate: 2024-02-28 17:49:29 +0000 ldconfig: support hints files of either byte-order Make the ldconfig program accept hints files in little-endian and big-endian format on all architectures. The default format is the native byte-order of the respective host. This is expected to change when a version of the pkg command is available that implements support for either byte-order in its internal ldconfig function. (Already committed in the development tree of the pkg utility, a release is expected at the end of Q1/2024). This update adds the -B option to the ldconfig program. It enforces the creation of a big-endian hints file on a little-endian host. The main purpose to is support of tests with non-native byte-order files on little-endian hosts. It will be removed when all supported FreeBSD releases use little-endian hints files by default. When little-endian hints files are generally used, support of either byte-order in libexec/rtld can also be removed. When support for big-endian hints files is no longer required, the COND_SWAP macro in ldconfig and rtld shall be replaced by le32toh(), which just return their argument on little-endian architectures. Approved by: kib MFC after: 1 month Relnotes: yes Differential Revision: https://reviews.freebsd.org/D44093 --- sbin/ldconfig/elfhints.c | 46 ++++++++++++++++++++++++++++++++-------------- sbin/ldconfig/ldconfig.8 | 11 ++++++++--- sbin/ldconfig/ldconfig.c | 13 ++++++++----- sbin/ldconfig/ldconfig.h | 2 +- 4 files changed, 49 insertions(+), 23 deletions(-) diff --git a/sbin/ldconfig/elfhints.c b/sbin/ldconfig/elfhints.c index 72b9273ab93a..d6ee5e0918d6 100644 --- a/sbin/ldconfig/elfhints.c +++ b/sbin/ldconfig/elfhints.c @@ -27,6 +27,7 @@ */ #include <sys/param.h> +#include <sys/endian.h> #include <sys/mman.h> #include <sys/stat.h> @@ -48,11 +49,12 @@ static void add_dir(const char *, const char *, bool); static void read_dirs_from_file(const char *, const char *); -static void read_elf_hints(const char *, bool); +static void read_elf_hints(const char *, bool, bool); static void write_elf_hints(const char *); static const char *dirs[MAXDIRS]; static int ndirs; +static bool is_be; bool insecure; static void @@ -95,7 +97,7 @@ list_elf_hints(const char *hintsfile) int i; int nlibs; - read_elf_hints(hintsfile, 1); + read_elf_hints(hintsfile, true, false); printf("%s:\n", hintsfile); printf("\tsearch directories:"); for (i = 0; i < ndirs; i++) @@ -183,8 +185,11 @@ read_dirs_from_file(const char *hintsfile, const char *listfile) fclose(fp); } +/* Convert between native byte order and forced little resp. big endian. */ +#define COND_SWAP(n) (is_be ? be32toh(n) : le32toh(n)) + static void -read_elf_hints(const char *hintsfile, bool must_exist) +read_elf_hints(const char *hintsfile, bool must_exist, bool force_be) { int fd; struct stat s; @@ -193,6 +198,7 @@ read_elf_hints(const char *hintsfile, bool must_exist) char *strtab; char *dirlist; char *p; + int hdr_version; if ((fd = open(hintsfile, O_RDONLY)) == -1) { if (errno == ENOENT && !must_exist) @@ -214,14 +220,18 @@ read_elf_hints(const char *hintsfile, bool must_exist) close(fd); hdr = (struct elfhints_hdr *)mapbase; - if (hdr->magic != ELFHINTS_MAGIC) + is_be = be32toh(hdr->magic) == ELFHINTS_MAGIC; + if (COND_SWAP(hdr->magic) != ELFHINTS_MAGIC) errx(1, "\"%s\": invalid file format", hintsfile); - if (hdr->version != 1) + if (force_be && !is_be) + errx(1, "\"%s\": incompatible endianness requested", hintsfile); + hdr_version = COND_SWAP(hdr->version); + if (hdr_version != 1) errx(1, "\"%s\": unrecognized file version (%d)", hintsfile, - hdr->version); + hdr_version); - strtab = (char *)mapbase + hdr->strtab; - dirlist = strtab + hdr->dirlist; + strtab = (char *)mapbase + COND_SWAP(hdr->strtab); + dirlist = strtab + COND_SWAP(hdr->dirlist); if (*dirlist != '\0') while ((p = strsep(&dirlist, ":")) != NULL) @@ -229,13 +239,19 @@ read_elf_hints(const char *hintsfile, bool must_exist) } void -update_elf_hints(const char *hintsfile, int argc, char **argv, bool merge) +update_elf_hints(const char *hintsfile, int argc, char **argv, bool merge, + bool force_be) { struct stat s; int i; + /* + * Remove "be32toh(1) == 1" from this condition to create + * little-endian hints files on all architectures by default. + */ + is_be = be32toh(1) == 1 || force_be; if (merge) - read_elf_hints(hintsfile, false); + read_elf_hints(hintsfile, false, force_be); for (i = 0; i < argc; i++) { if (stat(argv[i], &s) == -1) warn("warning: %s", argv[i]); @@ -265,9 +281,9 @@ write_elf_hints(const char *hintsfile) if ((fp = fdopen(fd, "wb")) == NULL) err(1, "fdopen(%s)", tempname); - hdr.magic = ELFHINTS_MAGIC; - hdr.version = 1; - hdr.strtab = sizeof hdr; + hdr.magic = COND_SWAP(ELFHINTS_MAGIC); + hdr.version = COND_SWAP(1); + hdr.strtab = COND_SWAP(sizeof hdr); hdr.strsize = 0; hdr.dirlist = 0; memset(hdr.spare, 0, sizeof hdr.spare); @@ -278,8 +294,10 @@ write_elf_hints(const char *hintsfile) for (i = 1; i < ndirs; i++) hdr.strsize += 1 + strlen(dirs[i]); } - hdr.dirlistlen = hdr.strsize; + hdr.dirlistlen = COND_SWAP(hdr.strsize); hdr.strsize++; /* For the null terminator */ + /* convert in-place from native to target endianness */ + hdr.strsize = COND_SWAP(hdr.strsize); /* Write the header. */ if (fwrite(&hdr, 1, sizeof hdr, fp) != sizeof hdr) diff --git a/sbin/ldconfig/ldconfig.8 b/sbin/ldconfig/ldconfig.8 index 47e0dfa99b50..88d99567912e 100644 --- a/sbin/ldconfig/ldconfig.8 +++ b/sbin/ldconfig/ldconfig.8 @@ -32,7 +32,7 @@ .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" -.Dd May 15, 2021 +.Dd February 28, 2024 .Dt LDCONFIG 8 .Os .Sh NAME @@ -41,7 +41,7 @@ .Sh SYNOPSIS .Nm .Op Fl 32 -.Op Fl Rimrv +.Op Fl BRimrv .Op Fl f Ar hints_file .Op Ar directory | Ar .Sh DESCRIPTION @@ -105,6 +105,11 @@ Generate the hints for 32-bit ABI shared libraries on 64-bit systems that support running 32-bit binaries. .It Fl elf Ignored for backwards compatibility. +.It Fl B +Force writing big-endian binary data´to the hints file. +The default is to create little-endian hints files on all architectures. +Reading of and merging into hints files preserves the endianness of the +existing hints file. .It Fl R Appends pathnames on the command line to the directory list from the hints file. @@ -159,7 +164,7 @@ invocations with .El .Sh SEE ALSO .Xr ld 1 , -.Xr ld-elf.so.1 , +.Xr ld-elf.so.1 1 , .Xr link 5 .Sh HISTORY A diff --git a/sbin/ldconfig/ldconfig.c b/sbin/ldconfig/ldconfig.c index 2f5cdbd6505e..0eb9cb801ac2 100644 --- a/sbin/ldconfig/ldconfig.c +++ b/sbin/ldconfig/ldconfig.c @@ -57,9 +57,9 @@ main(int argc, char **argv) { const char *hints_file; int c; - bool is_32, justread, merge, rescan, verbose; + bool is_32, justread, merge, rescan, force_be, verbose; - is_32 = justread = merge = rescan = verbose = false; + force_be = is_32 = justread = merge = rescan = verbose = false; while (argc > 1) { if (strcmp(argv[1], "-aout") == 0) { @@ -80,8 +80,11 @@ main(int argc, char **argv) hints_file = __PATH_ELF_HINTS("32"); else hints_file = _PATH_ELF_HINTS; - while((c = getopt(argc, argv, "Rf:imrsv")) != -1) { + while((c = getopt(argc, argv, "BRf:imrsv")) != -1) { switch (c) { + case 'B': + force_be = true; + break; case 'R': rescan = true; break; @@ -115,7 +118,7 @@ main(int argc, char **argv) if (argc == optind) rescan = true; update_elf_hints(hints_file, argc - optind, - argv + optind, merge || rescan); + argv + optind, merge || rescan, force_be); } exit(0); } @@ -124,7 +127,7 @@ static void usage(void) { fprintf(stderr, - "usage: ldconfig [-32] [-elf] [-Rimrv] [-f hints_file] " + "usage: ldconfig [-32] [-elf] [-BRimrv] [-f hints_file]" "[directory | file ...]\n"); exit(1); } diff --git a/sbin/ldconfig/ldconfig.h b/sbin/ldconfig/ldconfig.h index e03ba928be7d..aa7ad810bacd 100644 --- a/sbin/ldconfig/ldconfig.h +++ b/sbin/ldconfig/ldconfig.h @@ -36,7 +36,7 @@ extern bool insecure; /* -i flag, needed here for elfhints.c */ __BEGIN_DECLS void list_elf_hints(const char *); -void update_elf_hints(const char *, int, char **, bool); +void update_elf_hints(const char *, int, char **, bool, bool); __END_DECLS #endif