* [PATCH] elf: Initialize libc_map to NULL on namespace creation
@ 2022-08-24 19:43 Florian Weimer
2022-08-26 12:49 ` Florian Weimer
0 siblings, 1 reply; 2+ messages in thread
From: Florian Weimer @ 2022-08-24 19:43 UTC (permalink / raw)
To: libc-alpha
It seems that a stale libc_map value will be used (and not
overwritten) by a dlmopen after a dlclose that has deallocated
the namespace. This may not be visible easily because the libc
link map can be allocated at the same address.
Fixes commit ec935dea6332cb22f9881cd1162bad156173f4b0 ("elf:
Implement __libc_early_init").
---
elf/dl-open.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/elf/dl-open.c b/elf/dl-open.c
index dcc24130fe..582095a7fa 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -850,6 +850,10 @@ no more namespaces available for dlmopen()"));
++GL(dl_nns);
}
+ /* Clear any potential dangling libc link map references. */
+ GL(dl_ns)[nsid].libc_map = NULL;
+ GL(dl_ns)[nsid].libc_map_early_init = NULL;
+
_dl_debug_update (nsid)->r_state = RT_CONSISTENT;
}
/* Never allow loading a DSO in a namespace which is empty. Such
base-commit: 6f85dbf102ad7982409ba0fe96886caeb6389fef
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