From 562837c002e42f7f0a95764e3883898f05a59327 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Tue, 17 Jul 2018 16:07:03 -0700 Subject: x86: Add _CET_ENDBR to functions in dl-tlsdesc.S Add _CET_ENDBR to functions in dl-tlsdesc.S, which are called indirectly, to support IBT. Tested on i686 and x86-64. Reviewed-by: Carlos O'Donell * sysdeps/i386/dl-tlsdesc.S (_dl_tlsdesc_return): Add _CET_ENDBR. (_dl_tlsdesc_undefweak): Likewise. (_dl_tlsdesc_dynamic): Likewise. (_dl_tlsdesc_resolve_abs_plus_addend): Likewise. (_dl_tlsdesc_resolve_rel): Likewise. (_dl_tlsdesc_resolve_rela): Likewise. (_dl_tlsdesc_resolve_hold): Likewise. * sysdeps/x86_64/dl-tlsdesc.S (_dl_tlsdesc_return): Likewise. (_dl_tlsdesc_undefweak): Likewise. (_dl_tlsdesc_dynamic): Likewise. (_dl_tlsdesc_resolve_rela): Likewise. (_dl_tlsdesc_resolve_hold): Likewise. --- sysdeps/x86_64/dl-tlsdesc.S | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'sysdeps/x86_64') diff --git a/sysdeps/x86_64/dl-tlsdesc.S b/sysdeps/x86_64/dl-tlsdesc.S index 437bd8cde7..80d771cd88 100644 --- a/sysdeps/x86_64/dl-tlsdesc.S +++ b/sysdeps/x86_64/dl-tlsdesc.S @@ -37,6 +37,7 @@ cfi_startproc .align 16 _dl_tlsdesc_return: + _CET_ENDBR movq 8(%rax), %rax ret cfi_endproc @@ -58,6 +59,7 @@ _dl_tlsdesc_return: cfi_startproc .align 16 _dl_tlsdesc_undefweak: + _CET_ENDBR movq 8(%rax), %rax subq %fs:0, %rax ret @@ -96,6 +98,7 @@ _dl_tlsdesc_dynamic (register struct tlsdesc *tdp asm ("%rax")) cfi_startproc .align 16 _dl_tlsdesc_dynamic: + _CET_ENDBR /* Preserve call-clobbered registers that we modify. We need two scratch regs anyway. */ movq %rsi, -16(%rsp) @@ -166,6 +169,7 @@ _dl_tlsdesc_dynamic: .align 16 /* The PLT entry will have pushed the link_map pointer. */ _dl_tlsdesc_resolve_rela: + _CET_ENDBR cfi_adjust_cfa_offset (8) /* Save all call-clobbered registers. Add 8 bytes for push in the PLT entry to align the stack. */ @@ -216,6 +220,7 @@ _dl_tlsdesc_resolve_rela: .align 16 _dl_tlsdesc_resolve_hold: 0: + _CET_ENDBR /* Save all call-clobbered registers. */ subq $72, %rsp cfi_adjust_cfa_offset (72) -- cgit 1.4.1