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c02695d776
Child of vfork should either call _exit or one of the exec family of functions. But normally there is nothing to prevent child of vfork from return of the vfork-calling function. Simpilfy x86 vfork when shadow stack is in use to introduce mismatched shadow stack in child of vfork to trigger SIGSEGV when the child returns from the function in which vfork was called.
78 lines
2.3 KiB
ArmAsm
78 lines
2.3 KiB
ArmAsm
/* Copyright (C) 2001-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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#include <tcb-offsets.h>
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/* Clone the calling process, but without copying the whole address space.
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The calling process is suspended until the new process exits or is
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replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
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and the process ID of the new process to the old process. */
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ENTRY (__vfork)
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/* Pop the return PC value into RDI. We need a register that
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is preserved by the syscall and that we're allowed to destroy. */
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popq %rdi
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cfi_adjust_cfa_offset(-8)
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cfi_register(%rip, %rdi)
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/* Stuff the syscall number in RAX and enter into the kernel. */
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movl $SYS_ify (vfork), %eax
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syscall
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/* Push back the return PC. */
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pushq %rdi
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cfi_adjust_cfa_offset(8)
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cmpl $-4095, %eax
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jae SYSCALL_ERROR_LABEL /* Branch forward if it failed. */
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#if SHSTK_ENABLED
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/* Check if shadow stack is in use. */
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xorl %esi, %esi
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rdsspq %rsi
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testq %rsi, %rsi
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/* Normal return if shadow stack isn't in use. */
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je L(no_shstk)
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testl %eax, %eax
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/* In parent, normal return. */
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jnz L(no_shstk)
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/* NB: In child, jump back to caller via indirect branch without
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popping shadow stack which is shared with parent. Keep shadow
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stack mismatched so that child returns in the vfork-calling
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function will trigger SIGSEGV. */
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popq %rdi
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cfi_adjust_cfa_offset(-8)
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jmp *%rdi
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L(no_shstk):
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#endif
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/* Normal return. */
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ret
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PSEUDO_END (__vfork)
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libc_hidden_def (__vfork)
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weak_alias (__vfork, vfork)
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strong_alias (__vfork, __libc_vfork)
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