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elf: Signal LA_ACT_CONSISTENT to auditors after RT_CONSISTENT switch

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Auditors can call into the dynamic loader again if
LA_ACT_CONSISTENT, and  those recursive calls could observe
r_state != RT_CONSISTENT.

We should consider failing dlopen/dlmopen/dlclose if
r_state != RT_CONSISTENT.  The dynamic linker is probably not
in a state in which it can handle reentrant calls.  This
needs further investigation.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2024-10-25 16:50:10 +02:00
parent 9897ced8e7
commit e096b7a189
3 changed files with 13 additions and 13 deletions
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10
elf/dl-close.c
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@@ -723,6 +723,11 @@ _dl_close_worker (struct link_map *map, bool force)
/* TLS is cleaned up for the unloaded modules. */
__rtld_lock_unlock_recursive (GL(dl_load_tls_lock));
/* Notify the debugger those objects are finalized and gone. */
r->r_state = RT_CONSISTENT;
_dl_debug_state ();
LIBC_PROBE (unmap_complete, 2, nsid, r);
#ifdef SHARED
/* Auditing checkpoint: we have deleted all objects. Also, do not notify
auditors of the cleanup of a failed audit module loading attempt. */
@@ -735,11 +740,6 @@ _dl_close_worker (struct link_map *map, bool force)
--GL(dl_nns);
while (GL(dl_ns)[GL(dl_nns) - 1]._ns_loaded == NULL);
/* Notify the debugger those objects are finalized and gone. */
r->r_state = RT_CONSISTENT;
_dl_debug_state ();
LIBC_PROBE (unmap_complete, 2, nsid, r);
/* Recheck if we need to retry, release the lock. */
out:
if (dl_close_state == rerun)