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| author | H.J. Lu <hjl.tools@gmail.com> | 2021-01-18 11:45:46 +0000 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-01-19 06:38:28 -0800 |
| commit | cabc8a291629011894ff5d1dc4ec7e25ecee6269 (patch) | |
| tree | ff5468cc18c3bd7eb82524a98f239db8e8dca095 | |
| parent | 0ec583d926f9d4744918bd191cc7b8c3a74515a1 (diff) | |
| download | glibc-cabc8a291629011894ff5d1dc4ec7e25ecee6269.tar.gz glibc-cabc8a291629011894ff5d1dc4ec7e25ecee6269.tar.xz glibc-cabc8a291629011894ff5d1dc4ec7e25ecee6269.zip | |
elf: Avoid RELATIVE relocation for _dl_sysinfo
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>
| -rw-r--r-- | elf/dl-support.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/elf/dl-support.c b/elf/dl-support.c index 9d468d5a4b..2434c470c7 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -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) |