mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 06:20:06 +00:00
faaee1f07e
Save and restore shadow stack pointer in setjmp and longjmp to support shadow stack in Intel CET. Use feature_1 in tcbhead_t to check if shadow stack is enabled before saving and restoring shadow stack pointer. Reviewed-by: Carlos O'Donell <carlos@redhat.com> * sysdeps/i386/__longjmp.S: Include <jmp_buf-ssp.h>. (__longjmp): Restore shadow stack pointer if shadow stack is enabled, SHADOW_STACK_POINTER_OFFSET is defined and __longjmp isn't defined for __longjmp_cancel. * sysdeps/i386/bsd-_setjmp.S: Include <jmp_buf-ssp.h>. (_setjmp): Save shadow stack pointer if shadow stack is enabled and SHADOW_STACK_POINTER_OFFSET is defined. * sysdeps/i386/bsd-setjmp.S: Include <jmp_buf-ssp.h>. (setjmp): Save shadow stack pointer if shadow stack is enabled and SHADOW_STACK_POINTER_OFFSET is defined. * sysdeps/i386/setjmp.S: Include <jmp_buf-ssp.h>. (__sigsetjmp): Save shadow stack pointer if shadow stack is enabled and SHADOW_STACK_POINTER_OFFSET is defined. * sysdeps/unix/sysv/linux/i386/____longjmp_chk.S: Include <jmp_buf-ssp.h>. (____longjmp_chk): Restore shadow stack pointer if shadow stack is enabled and SHADOW_STACK_POINTER_OFFSET is defined. * sysdeps/unix/sysv/linux/x86/Makefile (gen-as-const-headers): Remove jmp_buf-ssp.sym. * sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S: Include <jmp_buf-ssp.h>. (____longjmp_chk): Restore shadow stack pointer if shadow stack is enabled and SHADOW_STACK_POINTER_OFFSET is defined. * sysdeps/x86/Makefile (gen-as-const-headers): Add jmp_buf-ssp.sym. * sysdeps/x86/jmp_buf-ssp.sym: New dummy file. * sysdeps/x86_64/__longjmp.S: Include <jmp_buf-ssp.h>. (__longjmp): Restore shadow stack pointer if shadow stack is enabled, SHADOW_STACK_POINTER_OFFSET is defined and __longjmp isn't defined for __longjmp_cancel. * sysdeps/x86_64/setjmp.S: Include <jmp_buf-ssp.h>. (__sigsetjmp): Save shadow stack pointer if shadow stack is enabled and SHADOW_STACK_POINTER_OFFSET is defined.
80 lines
2.3 KiB
ArmAsm
80 lines
2.3 KiB
ArmAsm
/* setjmp for i386.
|
|
Copyright (C) 1995-2018 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#include <jmpbuf-offsets.h>
|
|
#include <jmp_buf-ssp.h>
|
|
#include <asm-syntax.h>
|
|
#include <stap-probe.h>
|
|
|
|
#define PARMS 4 /* no space for saved regs */
|
|
#define JMPBUF PARMS
|
|
#define SIGMSK JMPBUF+4
|
|
|
|
/* Don't save shadow stack register if shadow stack isn't enabled. */
|
|
#if !SHSTK_ENABLED
|
|
# undef SHADOW_STACK_POINTER_OFFSET
|
|
#endif
|
|
|
|
ENTRY (__sigsetjmp)
|
|
|
|
movl JMPBUF(%esp), %eax
|
|
|
|
/* Save registers. */
|
|
movl %ebx, (JB_BX*4)(%eax)
|
|
movl %esi, (JB_SI*4)(%eax)
|
|
movl %edi, (JB_DI*4)(%eax)
|
|
leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */
|
|
#ifdef PTR_MANGLE
|
|
PTR_MANGLE (%ecx)
|
|
#endif
|
|
movl %ecx, (JB_SP*4)(%eax)
|
|
movl 0(%esp), %ecx /* Save PC we are returning to now. */
|
|
LIBC_PROBE (setjmp, 3, 4@%eax, -4@SIGMSK(%esp), 4@%ecx)
|
|
#ifdef PTR_MANGLE
|
|
PTR_MANGLE (%ecx)
|
|
#endif
|
|
movl %ecx, (JB_PC*4)(%eax)
|
|
movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */
|
|
|
|
#ifdef SHADOW_STACK_POINTER_OFFSET
|
|
# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
|
|
/* Check if Shadow Stack is enabled. */
|
|
testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
|
|
jz L(skip_ssp)
|
|
# else
|
|
xorl %ecx, %ecx
|
|
# endif
|
|
/* Get the current Shadow-Stack-Pointer and save it. */
|
|
rdsspd %ecx
|
|
movl %ecx, SHADOW_STACK_POINTER_OFFSET(%eax)
|
|
# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
|
|
L(skip_ssp):
|
|
# endif
|
|
#endif
|
|
#if IS_IN (rtld)
|
|
/* In ld.so we never save the signal mask. */
|
|
xorl %eax, %eax
|
|
ret
|
|
#else
|
|
/* Make a tail call to __sigjmp_save; it takes the same args. */
|
|
jmp __sigjmp_save
|
|
#endif
|
|
END (__sigsetjmp)
|
|
hidden_def (__sigsetjmp)
|