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| author | Florian Weimer <fweimer@redhat.com> | 2019-10-31 13:23:06 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2019-11-16 15:57:01 +0100 |
| commit | 2a764c6ee848dfe92cb2921ed3b14085f15d9e79 (patch) | |
| tree | 12d283aab07a5cb66474aff7a388dd585a2d2989 | |
| parent | 84df7a4637be8ecb545df3501cc724f3a4d53c46 (diff) | |
| download | glibc-2a764c6ee848dfe92cb2921ed3b14085f15d9e79.zip glibc-2a764c6ee848dfe92cb2921ed3b14085f15d9e79.tar.gz glibc-2a764c6ee848dfe92cb2921ed3b14085f15d9e79.tar.bz2 | |
Enhance _dl_catch_exception to allow disabling exception handling
In some cases, it is necessary to introduce noexcept regions
where raised dynamic loader exceptions (e.g., from lazy binding)
are fatal, despite being nested in a code region with an active
exception handler. This change enhances _dl_catch_exception with
to provide such a capability. The existing function is reused,
so that it is not necessary to introduce yet another function with
a similar purpose.
Change-Id: Iec1bf642ff95a349fdde8040e9baf851ac7b8904
| -rw-r--r-- | elf/dl-error-skeleton.c | 12 | ||||
| -rw-r--r-- | sysdeps/generic/ldsodefs.h | 4 |
2 files changed, 15 insertions, 1 deletions
diff --git a/elf/dl-error-skeleton.c b/elf/dl-error-skeleton.c index a261af6..7caf28f 100644 --- a/elf/dl-error-skeleton.c +++ b/elf/dl-error-skeleton.c @@ -173,6 +173,18 @@ int _dl_catch_exception (struct dl_exception *exception, void (*operate) (void *), void *args) { + /* If exception is NULL, temporarily disable exception handling. + Exceptions during operate (args) are fatal. */ + if (exception == NULL) + { + struct catch *const old = catch_hook; + catch_hook = NULL; + operate (args); + /* If we get here, the operation was successful. */ + catch_hook = old; + return 0; + } + /* We need not handle `receiver' since setting a `catch' is handled before it. */ diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h index 4d67c05..891049d 100644 --- a/sysdeps/generic/ldsodefs.h +++ b/sysdeps/generic/ldsodefs.h @@ -861,7 +861,9 @@ libc_hidden_proto (_dl_catch_error) /* Call OPERATE (ARGS). If no error occurs, set *EXCEPTION to zero. Otherwise, store a copy of the raised exception in *EXCEPTION, - which has to be freed by _dl_exception_free. */ + which has to be freed by _dl_exception_free. As a special case, if + EXCEPTION is null, call OPERATE (ARGS) with exception handling + disabled (so that exceptions are fatal). */ int _dl_catch_exception (struct dl_exception *exception, void (*operate) (void *), void *args); libc_hidden_proto (_dl_catch_exception) |