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libsys auxv.c: add fences needed to ensure that flag works

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Noted by:	jrtc27
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Konstantin Belousov 2024-02-21 16:12:12 +02:00
parent 58df49801d
commit 2f4cbf459d
1 changed files with 4 additions and 3 deletions
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7
lib/libsys/auxv.c
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@ -36,6 +36,7 @@
#include <sys/auxv.h> #include <sys/auxv.h>
#include "un-namespace.h" #include "un-namespace.h"
#include "libc_private.h" #include "libc_private.h"
#include <machine/atomic.h>
extern int _DYNAMIC; extern int _DYNAMIC;
#pragma weak _DYNAMIC #pragma weak _DYNAMIC
@ -66,7 +67,7 @@ __init_elf_aux_vector(void)
} }
#endif #endif
static bool aux_once = false; static int aux_once;
static int pagesize, osreldate, canary_len, ncpus, pagesizes_len, bsdflags; static int pagesize, osreldate, canary_len, ncpus, pagesizes_len, bsdflags;
static int hwcap_present, hwcap2_present; static int hwcap_present, hwcap2_present;
static char *canary, *pagesizes, *execpath; static char *canary, *pagesizes, *execpath;
@ -92,7 +93,7 @@ init_aux(void)
{ {
Elf_Auxinfo *aux; Elf_Auxinfo *aux;
if (aux_once) if (atomic_load_acq_int(&aux_once))
return; return;
for (aux = __elf_aux_vector; aux->a_type != AT_NULL; aux++) { for (aux = __elf_aux_vector; aux->a_type != AT_NULL; aux++) {
switch (aux->a_type) { switch (aux->a_type) {
@ -179,7 +180,7 @@ init_aux(void)
_init_aux_powerpc_fixup(); _init_aux_powerpc_fixup();
#endif #endif
aux_once = true; atomic_store_rel_int(&aux_once, 1);
} }
#ifdef __powerpc__ #ifdef __powerpc__