aboutsummaryrefslogtreecommitdiff
path: root/elf/dl-load.c
diff options
context:
space:
mode:
authorUlrich Drepper <drepper@redhat.com>1998-08-27 20:08:32 +0000
committerUlrich Drepper <drepper@redhat.com>1998-08-27 20:08:32 +0000
commitf787edde1dcd0f35feff9c8fd6384bd564558180 (patch)
tree82ebec99452b9faf41a02c7d1790e0c64d35c826 /elf/dl-load.c
parent6075607b9abba5ae10b87a9913f2a26548021272 (diff)
downloadglibc-f787edde1dcd0f35feff9c8fd6384bd564558180.zip
glibc-f787edde1dcd0f35feff9c8fd6384bd564558180.tar.gz
glibc-f787edde1dcd0f35feff9c8fd6384bd564558180.tar.bz2
Update.
1998-08-27 19:42 Ulrich Drepper <drepper@cygnus.com> * elf/Makefile (distribute): Add dl-origin.h. * sysdeps/generic/dl-origin.h: New file. * sysdeps/unix/sysv/linux/dl-origin.h: New file. * elf/link.h (struct link_map): Add l_origin field. * elf/dl-load.c (expand_dynamic_string_token): New function. (decompose_path): Remove WHERE argument, take link map pointer instead. Call expand_dynamic_string_token instead of local_strdup to make copy of rpath. (_dl_init_paths): Call decompose_path with correct argument. (_dl_map_object_from_fd): Define static is EXTERNAL_MAP_FROM_FD is not defined. Check EI_OSABI and EI_ABIVERSION fields in header. (_dl_map_object): Call decompose_path with correct argument. Call expand_dynamic_string_token instead of local_strdup to also expand DST. * elf/dl-object.c (_dl_new_object): Determine l_origin for all maps but the main one. * elf/dl-support.c: Define _dl_origin_path. * elf/rtld.c: Likewise. Set _dl_origin_path based on LD_ORIGIN_PATH. * elf/dl-close (_dl_close): Free l_name and l_origin. * sysdeps/i386/useldt.h (THREAD_GETMEM, THREAD_SETMEM): Use P modifier in asm, not c. * sysdeps/mach/hurd/Makefile [subdirs==elf]: Define CFLAGS-dl-load.c to -DEXTERNAL_MAP_FROM_FD to make _dl_map_object_from_fd extern.
Diffstat (limited to 'elf/dl-load.c')
-rw-r--r--elf/dl-load.c153
1 files changed, 141 insertions, 12 deletions
diff --git a/elf/dl-load.c b/elf/dl-load.c
index b14e52f..8e6a853 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -31,6 +31,8 @@
#include "dynamic-link.h"
#include <stdio-common/_itoa.h>
+#include <dl-origin.h>
+
/* On some systems, no flag bits are given to specify file mapping. */
#ifndef MAP_FILE
@@ -124,6 +126,116 @@ local_strdup (const char *s)
return (char *) memcpy (new, s, len);
}
+/* Return copy of argument with all recognized dynamic string tokens
+ ($ORIGIN and $PLATFORM for now) replaced. On some platforms it
+ might not be possible to determine the path from which the object
+ belonging to the map is loaded. In this case the path element
+ containing $ORIGIN is left out. */
+static char *
+expand_dynamic_string_token (struct link_map *l, const char *s)
+{
+ /* We make two runs over the string. First we determine how large the
+ resulting string is and then we copy it over. Since this is now
+ frequently executed operation we are looking here not for performance
+ but rather for code size. */
+ const char *st, *sf;
+ size_t cnt = 0;
+ size_t origin_len;
+ size_t total;
+ char *result, *last_elem, *wp;
+
+ st = s;
+ sf = strchr (s, '$');
+ while (sf != NULL)
+ {
+ size_t len = 1;
+
+ if (((strncmp (&sf[1], "ORIGIN", 6) == 0 && (len = 7) != 0)
+ || (strncmp (&sf[1], "PLATFORM", 8) == 0 && (len = 9) != 0))
+ && (s[len] == '\0' || s[len] == '/' || s[len] == ':'))
+ ++cnt;
+
+ st = sf + len;
+ sf = strchr (st, '$');
+ }
+
+ /* If we do not have to replace anything simply copy the string. */
+ if (cnt == 0)
+ return local_strdup (s);
+
+ /* Now we make a guess how many extra characters on top of the length
+ of S we need to represent the result. We know that we have CNT
+ replacements. Each at most can use
+ MAX (strlen (ORIGIN), strlen (_dl_platform))
+ minus 7 (which is the length of "$ORIGIN").
+
+ First get the origin string if it is not available yet. This can
+ only happen for the map of the executable. */
+ if (l->l_origin == NULL)
+ {
+ assert (l->l_name[0] == '\0');
+ l->l_origin = get_origin ();
+ origin_len = l->l_origin ? strlen (l->l_origin) : 0;
+ }
+ else
+ origin_len = l->l_origin == (char *) -1 ? 0 : strlen (l->l_origin);
+
+ total = strlen (s) + cnt * (MAX (origin_len, _dl_platformlen) - 7);
+ result = (char *) malloc (total + 1);
+ if (result == NULL)
+ return NULL;
+
+ /* Now fill the result path. While copying over the string we keep
+ track of the start of the last path element. When we come accross
+ a DST we copy over the value or (if the value is not available)
+ leave the entire path element out. */
+ last_elem = wp = result;
+ do
+ {
+ if (*s == '$')
+ {
+ const char *repl;
+ size_t len;
+
+ if (((strncmp (&s[1], "ORIGIN", 6) == 0 && (len = 7) != 0)
+ || (strncmp (&s[1], "PLATFORM", 8) == 0 && (len = 9) != 0))
+ && (s[len] == '\0' || s[len] == '/' || s[len] == ':'))
+ {
+ if ((repl = len == 7 ? l->l_origin : _dl_platform) != NULL
+ && repl != (const char *) -1)
+ {
+ wp = __stpcpy (wp, repl);
+ s += len;
+ }
+ else
+ {
+ /* We cannot use this path element, the value of the
+ replacement is unknown. */
+ wp = last_elem;
+ s += len;
+ while (*s != '\0' && *s != ':')
+ ++s;
+ }
+ }
+ else
+ /* No SDK we recognize. */
+ *wp++ = *s++;
+ }
+ else if (*s == ':')
+ {
+ *wp++ = *s++;
+ last_elem = wp;
+ }
+ else
+ *wp++ = *s++;
+ }
+ while (*s != '\0');
+
+ *wp = '\0';
+
+ return result;
+}
+
/* Add `name' to the list of names for a particular shared object.
`name' is expected to have been allocated with malloc and will
be freed if the shared object already has this name.
@@ -286,9 +398,10 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep,
static struct r_search_path_elem **
internal_function
-decompose_rpath (const char *rpath, size_t additional_room, const char *where)
+decompose_rpath (const char *rpath, size_t additional_room, struct link_map *l)
{
/* Make a copy we can work with. */
+ const char *where = l->l_name;
char *copy;
char *cp;
struct r_search_path_elem **result;
@@ -318,8 +431,13 @@ decompose_rpath (const char *rpath, size_t additional_room, const char *where)
}
}
+ /* Make a writable copy. At the same time expand possible dynamic
+ string tokens. */
+ copy = expand_dynamic_string_token (l, rpath);
+ if (copy == NULL)
+ _dl_signal_error (ENOMEM, NULL, "cannot create RPATH copy");
+
/* Count the number of necessary elements in the result array. */
- copy = local_strdup (rpath);
nelems = 0;
for (cp = copy; *cp != '\0'; ++cp)
if (*cp == ':')
@@ -429,7 +547,7 @@ _dl_init_paths (const char *llp)
decompose_rpath ((const char *)
(l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr
+ l->l_info[DT_RPATH]->d_un.d_val),
- nllp, l->l_name);
+ nllp, l);
}
else
{
@@ -497,6 +615,9 @@ _dl_init_paths (const char *llp)
/* Map in the shared object NAME, actually located in REALNAME, and already
opened on FD. */
+#ifndef EXTERNAL_MAP_FROM_FD
+static
+#endif
struct link_map *
_dl_map_object_from_fd (char *name, int fd, char *realname,
struct link_map *loader, int l_type)
@@ -591,6 +712,12 @@ _dl_map_object_from_fd (char *name, int fd, char *realname,
LOSE ("ELF file data encoding not " byteorder_name);
if (header->e_ident[EI_VERSION] != EV_CURRENT)
LOSE ("ELF file version ident not " STRING(EV_CURRENT));
+ /* XXX We should be able so set system specific versions which are
+ allowed here. */
+ if (header->e_ident[EI_OSABI] != ELFOSABI_SYSV)
+ LOSE ("ELF file OS ABI not " STRING(ELFOSABI_SYSV));
+ if (header->e_ident[EI_ABIVERSION] != 0)
+ LOSE ("ELF file ABI version not 0");
if (header->e_version != EV_CURRENT)
LOSE ("ELF file version not " STRING(EV_CURRENT));
if (! elf_machine_matches_host (header->e_machine))
@@ -1076,7 +1203,7 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
+ l->l_info[DT_STRTAB]->d_un.d_ptr
+ l->l_info[DT_RPATH]->d_un.d_val);
l->l_rpath_dirs =
- decompose_rpath ((const char *) ptrval, 0, l->l_name);
+ decompose_rpath ((const char *) ptrval, 0, l);
}
if (l->l_rpath_dirs != (struct r_search_path_elem **) -1l)
@@ -1127,15 +1254,17 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
}
else
{
- fd = __open (name, O_RDONLY);
- if (fd != -1)
+ /* The path may contain dynamic string tokens. */
+ realname = (loader
+ ? expand_dynamic_string_token (loader, name)
+ : local_strdup (name));
+ if (realname == NULL)
+ fd = -1;
+ else
{
- realname = local_strdup (name);
- if (realname == NULL)
- {
- __close (fd);
- fd = -1;
- }
+ fd = __open (realname, O_RDONLY);
+ if (fd == -1)
+ free (realname);
}
}