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commit 1e1ecea62e899acb58c3fdf3b320a0833ddd0dff
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Thu Sep 30 10:29:17 2021 -0700
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elf: Replace nsid with args.nsid [BZ #27609]
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commit ec935dea6332cb22f9881cd1162bad156173f4b0
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Apr 24 22:31:15 2020 +0200
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elf: Implement __libc_early_init
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has
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@@ -856,6 +876,11 @@ no more namespaces available for dlmopen()"));
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/* See if an error occurred during loading. */
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if (__glibc_unlikely (exception.errstring != NULL))
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{
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+ /* Avoid keeping around a dangling reference to the libc.so link
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+ map in case it has been cached in libc_map. */
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+ if (!args.libc_already_loaded)
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+ GL(dl_ns)[nsid].libc_map = NULL;
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+
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do_dlopen calls _dl_open with nsid == __LM_ID_CALLER (-2), which calls
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dl_open_worker with args.nsid = nsid. dl_open_worker updates args.nsid
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if it is __LM_ID_CALLER. After dl_open_worker returns, it is wrong to
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use nsid.
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Replace nsid with args.nsid after dl_open_worker returns. This fixes
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BZ #27609.
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diff --git a/elf/dl-open.c b/elf/dl-open.c
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index 661a2172d1789b26..b5a4da04907d8d29 100644
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--- a/elf/dl-open.c
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+++ b/elf/dl-open.c
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@@ -916,7 +916,7 @@ no more namespaces available for dlmopen()"));
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/* Avoid keeping around a dangling reference to the libc.so link
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map in case it has been cached in libc_map. */
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if (!args.libc_already_loaded)
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- GL(dl_ns)[nsid].libc_map = NULL;
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+ GL(dl_ns)[args.nsid].libc_map = NULL;
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/* Remove the object from memory. It may be in an inconsistent
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state if relocation failed, for example. */
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