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Diffstat (limited to 'elf/dl-load.c')
-rw-r--r--elf/dl-load.c90
1 files changed, 63 insertions, 27 deletions
diff --git a/elf/dl-load.c b/elf/dl-load.c
index 15fff3c5e1..83d46f04ee 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -699,7 +699,7 @@ _dl_init_paths (const char *llp)
#ifdef SHARED
/* This points to the map of the main object. */
- l = GL(dl_loaded);
+ l = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
if (l != NULL)
{
assert (l->l_type != lt_loaded);
@@ -795,10 +795,10 @@ lose (int code, int fd, const char *name, char *realname, struct link_map *l,
if (l->l_prev == NULL)
/* No other module loaded. This happens only in the static library,
or in rtld under --verify. */
- GL(dl_loaded) = NULL;
+ GL(dl_ns)[l->l_ns]._ns_loaded = NULL;
else
l->l_prev->l_next = NULL;
- --GL(dl_nloaded);
+ --GL(dl_ns)[l->l_ns]._ns_nloaded;
free (l);
}
free (realname);
@@ -815,7 +815,7 @@ static
struct link_map *
_dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp,
char *realname, struct link_map *loader, int l_type,
- int mode, void **stack_endp)
+ int mode, void **stack_endp, Lmid_t nsid)
{
struct link_map *l = NULL;
const ElfW(Ehdr) *header;
@@ -839,7 +839,7 @@ _dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp,
}
/* Look again to see if the real name matched another already loaded. */
- for (l = GL(dl_loaded); l; l = l->l_next)
+ for (l = GL(dl_ns)[nsid]._ns_loaded; l; l = l->l_next)
if (l->l_ino == st.st_ino && l->l_dev == st.st_dev)
{
/* The object is already loaded.
@@ -854,6 +854,31 @@ _dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp,
return l;
}
+#ifdef SHARED
+ /* When loading into a namespace other than the base one we must
+ avoid loading ld.so since there can only be one copy. Ever. */
+ if (__builtin_expect (nsid != LM_ID_BASE, 0)
+ && ((st.st_ino == GL(dl_rtld_map).l_ino
+ && st.st_dev == GL(dl_rtld_map).l_dev)
+ || _dl_name_match_p (name, &GL(dl_rtld_map))))
+ {
+ /* This is indeed ld.so. Create a new link_map which refers to
+ the real one for almost everything. */
+ l = _dl_new_object (realname, name, l_type, loader, mode, nsid);
+ if (l == NULL)
+ goto fail_new;
+
+ /* Refer to the real descriptor. */
+ l->l_real = &GL(dl_rtld_map);
+
+ /* No need to bump the refcount of the real object, ld.so will
+ never be unloaded. */
+ __close (fd);
+
+ return l;
+ }
+#endif
+
if (mode & RTLD_NOLOAD)
/* We are not supposed to load the object unless it is already
loaded. So return now. */
@@ -861,7 +886,7 @@ _dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp,
/* Print debugging message. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
- _dl_debug_printf ("file=%s; generating link map\n", name);
+ _dl_debug_printf ("file=%s [%lu]; generating link map\n", name, nsid);
/* This is the ELF header. We read it in `open_verify'. */
header = (void *) fbp->buf;
@@ -881,9 +906,10 @@ _dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp,
#endif
/* Enter the new object in the list of loaded objects. */
- l = _dl_new_object (realname, name, l_type, loader, mode);
- if (__builtin_expect (! l, 0))
+ l = _dl_new_object (realname, name, l_type, loader, mode, nsid);
+ if (__builtin_expect (l == NULL, 0))
{
+ fail_new:
errstring = N_("cannot create shared object descriptor");
goto call_lose_errno;
}
@@ -1771,7 +1797,7 @@ open_path (const char *name, size_t namelen, int preloaded,
struct link_map *
internal_function
_dl_map_object (struct link_map *loader, const char *name, int preloaded,
- int type, int trace_mode, int mode)
+ int type, int trace_mode, int mode, Lmid_t nsid)
{
int fd;
char *realname;
@@ -1779,8 +1805,11 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
struct link_map *l;
struct filebuf fb;
+ assert (nsid >= 0);
+ assert (nsid < DL_NNS);
+
/* Look for this name among those already loaded. */
- for (l = GL(dl_loaded); l; l = l->l_next)
+ for (l = GL(dl_ns)[nsid]._ns_loaded; l; l = l->l_next)
{
/* If the requested name matches the soname of a loaded object,
use that object. Elide this check for names that have not
@@ -1812,9 +1841,9 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
/* Display information if we are debugging. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0)
&& loader != NULL)
- _dl_debug_printf ("\nfile=%s; needed by %s\n", name,
+ _dl_debug_printf ("\nfile=%s [%lu]; needed by %s [%lu]\n", name, nsid,
loader->l_name[0]
- ? loader->l_name : rtld_progname);
+ ? loader->l_name : rtld_progname, loader->l_ns);
if (strchr (name, '/') == NULL)
{
@@ -1823,7 +1852,7 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
size_t namelen = strlen (name) + 1;
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_LIBS, 0))
- _dl_debug_printf ("find library=%s; searching\n", name);
+ _dl_debug_printf ("find library=%s [%lu]; searching\n", name, nsid);
fd = -1;
@@ -1839,12 +1868,15 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
&realname, &fb);
/* If dynamically linked, try the DT_RPATH of the executable
- itself. */
- l = GL(dl_loaded);
- if (fd == -1 && l && l->l_type != lt_loaded && l != loader
- && l->l_rpath_dirs.dirs != (void *) -1)
- fd = open_path (name, namelen, preloaded, &l->l_rpath_dirs,
- &realname, &fb);
+ itself. NB: we do this for lookups in any namespace. */
+ if (fd == -1)
+ {
+ l = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
+ if (l && l->l_type != lt_loaded && l != loader
+ && l->l_rpath_dirs.dirs != (void *) -1)
+ fd = open_path (name, namelen, preloaded, &l->l_rpath_dirs,
+ &realname, &fb);
+ }
}
/* Try the LD_LIBRARY_PATH environment variable. */
@@ -1870,7 +1902,8 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
if (cached != NULL)
{
#ifdef SHARED
- l = loader ?: GL(dl_loaded);
+ // XXX Correct to unconditionally default to namespace 0?
+ l = loader ?: GL(dl_ns)[LM_ID_BASE]._ns_loaded;
#else
l = loader;
#endif
@@ -1920,7 +1953,7 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
/* Finally, try the default path. */
if (fd == -1
- && ((l = loader ?: GL(dl_loaded)) == NULL
+ && ((l = loader ?: GL(dl_ns)[nsid]._ns_loaded) == NULL
|| __builtin_expect (!(l->l_flags_1 & DF_1_NODEFLIB), 1))
&& rtld_search_dirs.dirs != (void *) -1)
fd = open_path (name, namelen, preloaded, &rtld_search_dirs,
@@ -1966,7 +1999,7 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
/* Enter the new object in the list of loaded objects. */
if ((name_copy = local_strdup (name)) == NULL
|| (l = _dl_new_object (name_copy, name, type, loader,
- mode)) == NULL)
+ mode, nsid)) == NULL)
_dl_signal_error (ENOMEM, name, NULL,
N_("cannot create shared object descriptor"));
/* Signal that this is a faked entry. */
@@ -1987,7 +2020,7 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
void *stack_end = __libc_stack_end;
return _dl_map_object_from_fd (name, fd, &fb, realname, loader, type, mode,
- &stack_end);
+ &stack_end, nsid);
}
@@ -2047,10 +2080,13 @@ _dl_rtld_di_serinfo (struct link_map *loader, Dl_serinfo *si, bool counting)
while (l != NULL);
/* If dynamically linked, try the DT_RPATH of the executable itself. */
- l = GL(dl_loaded);
- if (l != NULL && l->l_type != lt_loaded && l != loader)
- if (cache_rpath (l, &l->l_rpath_dirs, DT_RPATH, "RPATH"))
- add_path (&l->l_rpath_dirs, XXX_RPATH);
+ if (loader->l_ns == LM_ID_BASE)
+ {
+ l = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
+ if (l != NULL && l->l_type != lt_loaded && l != loader)
+ if (cache_rpath (l, &l->l_rpath_dirs, DT_RPATH, "RPATH"))
+ add_path (&l->l_rpath_dirs, XXX_RPATH);
+ }
}
/* Try the LD_LIBRARY_PATH environment variable. */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 18:15:12 +0000