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authorFlorian Weimer <fweimer@redhat.com>2022-11-03 09:39:31 +0100
committerFlorian Weimer <fweimer@redhat.com>2022-11-03 09:39:31 +0100
commitee1ada1bdb8074de6e1bdc956ab19aef7b6a7872 (patch)
tree4e70dfcb1c076da10542c08d7e0b3900a0a34adc /nptl
parentf4ce325dfc50e13cf8240424fa0561fca78e72e7 (diff)
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elf: Rework exception handling in the dynamic loader [BZ #25486]
The old exception handling implementation used function interposition to replace the dynamic loader implementation (no TLS support) with the libc implementation (TLS support). This results in problems if the link order between the dynamic loader and libc is reversed (bug 25486). The new implementation moves the entire implementation of the exception handling functions back into the dynamic loader, using THREAD_GETMEM and THREAD_SETMEM for thread-local data support. These depends on Hurd support for these macros, added in commit b65a82e4e757c1e6cb7073916 ("hurd: Add THREAD_GET/SETMEM/_NC"). One small obstacle is that the exception handling facilities are used before the TCB has been set up, so a check is needed if the TCB is available. If not, a regular global variable is used to store the exception handling information. Also rename dl-error.c to dl-catch.c, to avoid confusion with the dlerror function. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'nptl')
-rw-r--r--nptl/descr.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/nptl/descr.h b/nptl/descr.h
index 5cacb28..0fa0e48 100644
--- a/nptl/descr.h
+++ b/nptl/descr.h
@@ -390,6 +390,9 @@ struct pthread
masked.) */
internal_sigset_t sigmask;
+ /* Used by the exception handling implementation in the dynamic loader. */
+ struct rtld_catch *rtld_catch;
+
/* Indicates whether is a C11 thread created by thrd_creat. */
bool c11;