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Linux: Make __rseq_size useful for feature detection (bug 31965)

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The __rseq_size value is now the active area of struct rseq
(so 20 initially), not the full struct size including padding
at the end (32 initially).

Update misc/tst-rseq to print some additional diagnostics.

Reviewed-by: Michael Jeanson <mjeanson@efficios.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
This commit is contained in:
Florian Weimer
2024-07-08 21:14:00 +02:00
parent 7e7f35278c
commit 2e456ccf0c
5 changed files with 40 additions and 12 deletions
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8
sysdeps/nptl/dl-tls_init_tp.c
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@@ -46,10 +46,6 @@ rtld_mutex_dummy (pthread_mutex_t *lock)
const unsigned int __rseq_flags;
/* The variables are in .data.relro but are not yet write-protected. */
extern unsigned int _rseq_size attribute_hidden;
extern ptrdiff_t _rseq_offset attribute_hidden;
void
__tls_pre_init_tp (void)
{
@@ -106,9 +102,7 @@ __tls_init_tp (void)
bool do_rseq = true;
do_rseq = TUNABLE_GET (rseq, int, NULL);
if (rseq_register_current_thread (pd, do_rseq))
{
_rseq_size = sizeof (pd->rseq_area);
}
_rseq_size = RSEQ_AREA_SIZE_INITIAL_USED;
#ifdef RSEQ_SIG
/* This should be a compile-time constant, but the current