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elf: Avoid RELATIVE relocation for _dl_sysinfo

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Set the default _dl_sysinfo in _dl_aux_init to avoid RELATIVE relocation
in static PIE.

This is needed for fixing bug 27072 on x86.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
H.J. Lu 2021-01-18 11:45:46 +00:00
parent 0ec583d926
commit cabc8a2916
1 changed files with 8 additions and 2 deletions
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10
elf/dl-support.c
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@ -193,8 +193,9 @@ int _dl_thread_gscope_count;
struct dl_scope_free_list *_dl_scope_free_list;
#ifdef NEED_DL_SYSINFO
/* Needed for improved syscall handling on at least x86/Linux. */
uintptr_t _dl_sysinfo = DL_SYSINFO_DEFAULT;
/* Needed for improved syscall handling on at least x86/Linux. NB: Don't
initialize it here to avoid RELATIVE relocation in static PIE. */
uintptr_t _dl_sysinfo;
#endif
#ifdef NEED_DL_SYSINFO_DSO
/* Address of the ELF headers in the vsyscall page. */
@ -232,6 +233,11 @@ _dl_aux_init (ElfW(auxv_t) *av)
uid_t uid = 0;
gid_t gid = 0;
#ifdef NEED_DL_SYSINFO
/* NB: Avoid RELATIVE relocation in static PIE. */
GL(dl_sysinfo) = DL_SYSINFO_DEFAULT;
#endif
_dl_auxv = av;
for (; av->a_type != AT_NULL; ++av)
switch (av->a_type)