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Diffstat (limited to 'elf/rtld.c')
-rw-r--r--elf/rtld.c51
1 files changed, 42 insertions, 9 deletions
diff --git a/elf/rtld.c b/elf/rtld.c
index 88f0d6d..d0c25b4 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -39,10 +39,12 @@ extern Elf32_Addr _dl_sysdep_start (void **start_argptr,
void (*dl_main) (const Elf32_Phdr *phdr,
Elf32_Word phent,
Elf32_Addr *user_entry));
+extern void _dl_sysdep_start_cleanup (void);
int _dl_secure;
int _dl_argc;
char **_dl_argv;
+const char *_dl_rpath;
struct r_debug dl_r_debug;
@@ -93,7 +95,13 @@ _dl_start (void *arg)
rtld_map.l_addr = bootstrap_map.l_addr;
rtld_map.l_ld = bootstrap_map.l_ld;
memcpy (rtld_map.l_info, bootstrap_map.l_info, sizeof rtld_map.l_info);
+ _dl_setup_hash (&rtld_map);
+ /* Cache the DT_RPATH stored in ld.so itself; this will be
+ the default search path. */
+ _dl_rpath = (void *) (rtld_map.l_addr +
+ rtld_map.l_info[DT_STRTAB]->d_un.d_ptr +
+ rtld_map.l_info[DT_RPATH]->d_un.d_val);
/* Call the OS-dependent function to set up life so we can do things like
file access. It will call `dl_main' (below) to do all the real work
@@ -118,10 +126,11 @@ dl_main (const Elf32_Phdr *phdr,
void doit (void)
{
const Elf32_Phdr *ph;
- struct link_map *l;
+ struct link_map *l, *last, *before_rtld;
const char *interpreter_name;
int lazy;
int list_only = 0;
+ __typeof (_exit) *volatile exitfn;
if (*user_entry == (Elf32_Addr) &_start)
{
@@ -248,6 +257,7 @@ of this helper program; chances are you did not intend to run this program.\n",
/* Now process all the DT_NEEDED entries and map in the objects.
Each new link_map will go on the end of the chain, so we will
come across it later in the loop to map in its dependencies. */
+ before_rtld = NULL;
for (l = _dl_loaded; l; l = l->l_next)
{
if (l->l_info[DT_NEEDED])
@@ -255,24 +265,47 @@ of this helper program; chances are you did not intend to run this program.\n",
const char *strtab
= (void *) l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr;
const Elf32_Dyn *d;
+ last = l;
for (d = l->l_ld; d->d_tag != DT_NULL; ++d)
if (d->d_tag == DT_NEEDED)
- _dl_map_object (l, strtab + d->d_un.d_val);
+ {
+ struct link_map *new;
+ new = _dl_map_object (l, strtab + d->d_un.d_val);
+ if (!before_rtld && new == &rtld_map)
+ before_rtld = last;
+ last = new;
+ }
}
l->l_deps_loaded = 1;
}
- if (rtld_map.l_opencount == 0)
+ /* If any DT_NEEDED entry referred to the interpreter object itself,
+ reorder the list so it appears after its dependent. If not,
+ remove it from the maps we will use for symbol resolution. */
+ rtld_map.l_prev->l_next = rtld_map.l_next;
+ if (rtld_map.l_next)
+ rtld_map.l_next->l_prev = rtld_map.l_prev;
+ if (before_rtld)
{
- /* No DT_NEEDED entry referred to the interpreter object itself.
- Remove it from the maps we will use for symbol resolution. */
- rtld_map.l_prev->l_next = rtld_map.l_next;
+ rtld_map.l_prev = before_rtld;
+ rtld_map.l_next = before_rtld->l_next;
+ before_rtld->l_next = &rtld_map;
if (rtld_map.l_next)
- rtld_map.l_next->l_prev = rtld_map.l_prev;
+ rtld_map.l_next->l_prev = &rtld_map;
}
lazy = !_dl_secure && *(getenv ("LD_BIND_NOW") ?: "") == '\0';
+ /* Fetch this value now, before real relocation. For --list, it will
+ be called below, and the finally-linked version is not the right
+ one. */
+ exitfn = &_exit;
+
+ /* Do any necessary cleanups for the startup OS interface code.
+ We do these now so that no calls are made after real relocation
+ which might be resolved to different functions than we expect. */
+ _dl_sysdep_start_cleanup ();
+
/* Now we have all the objects loaded. Relocate them all.
We do this in reverse order so that copy relocs of earlier
objects overwrite the data written by later objects. */
@@ -297,7 +330,7 @@ of this helper program; chances are you did not intend to run this program.\n",
{
_dl_sysdep_message (_dl_loaded->l_name, ": statically linked\n",
NULL);
- _exit (1);
+ (*exitfn) (1);
}
for (l = _dl_loaded->l_next; l; l = l->l_next)
@@ -311,7 +344,7 @@ of this helper program; chances are you did not intend to run this program.\n",
" (0x", bp, ")\n", NULL);
}
- _exit (0);
+ (*exitfn) (0);
}
if (rtld_map.l_info[DT_INIT])