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28 lines
1.2 KiB
Diff
28 lines
1.2 KiB
Diff
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commit 328c44c3670ebf6c1bd790acddce65a12998cd6c
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Author: Roland McGrath <roland@hack.frob.com>
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Date: Fri Apr 17 12:11:58 2015 -0700
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Fuller check for invalid NSID in _dl_open.
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diff --git a/elf/dl-open.c b/elf/dl-open.c
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index 0dbe07f..2d0e082 100644
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--- a/elf/dl-open.c
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+++ b/elf/dl-open.c
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@@ -619,8 +619,14 @@ no more namespaces available for dlmopen()"));
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/* Never allow loading a DSO in a namespace which is empty. Such
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direct placements is only causing problems. Also don't allow
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loading into a namespace used for auditing. */
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- else if (__builtin_expect (nsid != LM_ID_BASE && nsid != __LM_ID_CALLER, 0)
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- && (GL(dl_ns)[nsid]._ns_nloaded == 0
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+ else if (__glibc_unlikely (nsid != LM_ID_BASE && nsid != __LM_ID_CALLER)
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+ && (__glibc_unlikely (nsid < 0 || nsid >= GL(dl_nns))
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+ /* This prevents the [NSID] index expressions from being
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+ evaluated, so the compiler won't think that we are
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+ accessing an invalid index here in the !SHARED case where
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+ DL_NNS is 1 and so any NSID != 0 is invalid. */
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+ || DL_NNS == 1
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+ || GL(dl_ns)[nsid]._ns_nloaded == 0
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|| GL(dl_ns)[nsid]._ns_loaded->l_auditing))
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_dl_signal_error (EINVAL, file, NULL,
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N_("invalid target namespace in dlmopen()"));
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