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commit 2a764c6ee848dfe92cb2921ed3b14085f15d9e79
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Oct 31 13:23:06 2019 +0100
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Enhance _dl_catch_exception to allow disabling exception handling
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In some cases, it is necessary to introduce noexcept regions
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where raised dynamic loader exceptions (e.g., from lazy binding)
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are fatal, despite being nested in a code region with an active
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exception handler. This change enhances _dl_catch_exception with
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to provide such a capability. The existing function is reused,
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so that it is not necessary to introduce yet another function with
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a similar purpose.
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Change-Id: Iec1bf642ff95a349fdde8040e9baf851ac7b8904
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diff --git a/elf/dl-error-skeleton.c b/elf/dl-error-skeleton.c
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index d5f418ab1848f0c4..9cb002ccfed2c7b4 100644
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--- a/elf/dl-error-skeleton.c
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+++ b/elf/dl-error-skeleton.c
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@@ -173,6 +173,18 @@ int
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_dl_catch_exception (struct dl_exception *exception,
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void (*operate) (void *), void *args)
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{
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+ /* If exception is NULL, temporarily disable exception handling.
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+ Exceptions during operate (args) are fatal. */
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+ if (exception == NULL)
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+ {
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+ struct catch *const old = catch_hook;
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+ catch_hook = NULL;
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+ operate (args);
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+ /* If we get here, the operation was successful. */
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+ catch_hook = old;
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+ return 0;
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+ }
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+
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/* We need not handle `receiver' since setting a `catch' is handled
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before it. */
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diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
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index 95dc87519b80e0ec..cc2484033fe0d902 100644
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--- a/sysdeps/generic/ldsodefs.h
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+++ b/sysdeps/generic/ldsodefs.h
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@@ -852,7 +852,9 @@ libc_hidden_proto (_dl_catch_error)
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/* Call OPERATE (ARGS). If no error occurs, set *EXCEPTION to zero.
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Otherwise, store a copy of the raised exception in *EXCEPTION,
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- which has to be freed by _dl_exception_free. */
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+ which has to be freed by _dl_exception_free. As a special case, if
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+ EXCEPTION is null, call OPERATE (ARGS) with exception handling
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+ disabled (so that exceptions are fatal). */
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int _dl_catch_exception (struct dl_exception *exception,
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void (*operate) (void *), void *args);
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libc_hidden_proto (_dl_catch_exception)
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