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elf: rtld_multiple_ref is always true

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For a long time, libc.so.6 has dependend on ld.so, which
means that there is a reference to ld.so in all processes,
and rtld_multiple_ref is always true.  In fact, if
rtld_multiple_ref were false, some of the ld.so setup code
would not run.

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Florian Weimer 2024-11-06 10:33:44 +01:00
parent 273694cd78
commit 8f8dd904c4
1 changed files with 47 additions and 55 deletions
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18
elf/rtld.c
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@ -1963,14 +1963,9 @@ dl_main (const ElfW(Phdr) *phdr,
if (main_map->l_searchlist.r_list[i] == &GL(dl_rtld_map))
break;
bool rtld_multiple_ref = false;
if (__glibc_likely (i < main_map->l_searchlist.r_nlist))
{
/* Some DT_NEEDED entry referred to the interpreter object itself, so
put it back in the list of visible objects. We insert it into the
chain in symbol search order because gdb uses the chain's order as
its symbol search order. */
rtld_multiple_ref = true;
/* Insert the link map for the dynamic loader into the chain in
symbol search order because gdb uses the chain's order as its
symbol search order. */
GL(dl_rtld_map).l_prev = main_map->l_searchlist.r_list[i - 1];
if (__glibc_likely (state.mode == rtld_mode_normal))
@ -2000,7 +1995,6 @@ dl_main (const ElfW(Phdr) *phdr,
assert (GL(dl_rtld_map).l_next->l_prev == GL(dl_rtld_map).l_prev);
GL(dl_rtld_map).l_next->l_prev = &GL(dl_rtld_map);
}
}
/* Now let us see whether all libraries are available in the
versions we need. */
@ -2327,10 +2321,7 @@ dl_main (const ElfW(Phdr) *phdr,
/* Make sure no new search directories have been added. */
assert (GLRO(dl_init_all_dirs) == GL(dl_all_dirs));
if (rtld_multiple_ref)
{
/* There was an explicit ref to the dynamic linker as a shared lib.
Re-relocate ourselves with user-controlled symbol definitions.
/* Re-relocate ourselves with user-controlled symbol definitions.
We must do this after TLS initialization in case after this
re-relocation, we might call a user-supplied function
@ -2347,6 +2338,7 @@ dl_main (const ElfW(Phdr) *phdr,
/* Likewise for the locking implementation. */
__rtld_mutex_init ();
{
RTLD_TIMING_VAR (start);
rtld_timer_start (&start);