From 2c43d202aefb2b6f202a44bbb8a0baf251aae845 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Mon, 22 Aug 2022 10:26:17 -0700 Subject: [PATCH] x86: Ignore protected visibility in shared libraries on Solaris On x86, the PLT entry in executable may be used as function address for functions in shared libraries. If functions are protected, the function address used in executable can be different from the function address used in shared library. This will lead to incorrect run-time behavior if function pointer equality is needed. By default, x86 linker issues an error in this case. On Solaris, linker issued an error for struct tm *tb = (kind == CPP_time_kind::FIXED ? gmtime : localtime) (&tt); where gmtime is a protected function in libc.so. Use gmtime's PLT entry in executable as function address is safe since function pointer equality isn't needed. Ignore protected visibility in shared libraries on Solaris to disable linker error. If function pointer equality is needed, linker will silently generate executable with incorrect run-time behavior on Solaris. PR ld/29512 * elf32-i386.c (elf_i386_scan_relocs): Ignore protected visibility in shared libraries on Solaris. * elf64-x86-64.c (elf_x86_64_scan_relocs): Likewise. --- bfd/elf32-i386.c | 3 ++- bfd/elf64-x86-64.c | 3 ++- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/bfd/elf32-i386.c b/bfd/elf32-i386.c index 52b1db44546..9717e2c5ed6 100644 --- a/bfd/elf32-i386.c +++ b/bfd/elf32-i386.c @@ -1808,7 +1808,8 @@ elf_i386_scan_relocs (bfd *abfd, || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0) h->plt.refcount = 1; - if (h->pointer_equality_needed + if (htab->elf.target_os != is_solaris + && h->pointer_equality_needed && h->type == STT_FUNC && eh->def_protected && !SYMBOL_DEFINED_NON_SHARED_P (h) diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c index 62a9a22317a..f3b54400013 100644 --- a/bfd/elf64-x86-64.c +++ b/bfd/elf64-x86-64.c @@ -2251,7 +2251,8 @@ elf_x86_64_scan_relocs (bfd *abfd, struct bfd_link_info *info, || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0) h->plt.refcount = 1; - if (h->pointer_equality_needed + if (htab->elf.target_os != is_solaris + && h->pointer_equality_needed && h->type == STT_FUNC && eh->def_protected && !SYMBOL_DEFINED_NON_SHARED_P (h) -- 2.30.2