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nptl: Move legacy unwinding implementation into libc

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It is still used internally.  Since unwinding is now available
unconditionally, avoid indirect calls through function pointers loaded
from the stack by inlining the non-cancellation cleanup code.  This
avoids a regression in security hardening.

The out-of-line  __libc_cleanup_routine implementation is no longer
needed because the inline definition is now static __always_inline.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2021-04-21 19:49:50 +02:00
parent 5715c29e91
commit f79f206581
7 changed files with 98 additions and 117 deletions
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nptl/nptl-init.c
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@ -95,8 +95,6 @@ static const struct pthread_functions pthread_functions =
.ptr___pthread_key_create = __pthread_key_create,
.ptr___pthread_getspecific = __pthread_getspecific,
.ptr___pthread_setspecific = __pthread_setspecific,
.ptr__pthread_cleanup_push_defer = __pthread_cleanup_push_defer,
.ptr__pthread_cleanup_pop_restore = __pthread_cleanup_pop_restore,
.ptr_nthreads = &__nptl_nthreads,
.ptr___pthread_unwind = &__pthread_unwind,
.ptr__nptl_deallocate_tsd = __nptl_deallocate_tsd,