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Replace MD assembly exect() with a portable version.

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Originally, on the VAX exect() enable tracing once the new executable
image was loaded.  This was possible because tracing was controllable
through user space code by setting the PSL_T flag.  The following
instruction is a system call that activated tracing (as all
instructions do) by copying PSL_T to PSL_TP (trace pending).  The
first instruction of the new executable image would trigger a trace
fault.

This is not portable to all platforms and the behavior was replaced with
ptrace(PT_TRACE_ME, ...) since FreeBSD forked off of the CSRG repository.
Platforms either incorrectly call execve(), trigger trace faults inside
the original executable, or do contain an implementation of this
function.

The exect() interfaces is deprecated or removed on NetBSD and OpenBSD.

Submitted by:	Ali Mashtizadeh <ali@mashtizadeh.com>
Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D14989
This commit is contained in:
Brooks Davis 2018-04-12 18:23:14 +00:00
parent 17b382ec14
commit 87385baff6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=332443
20 changed files with 53 additions and 316 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
lib/libc/amd64/Symbol.map
View File

@ -40,7 +40,6 @@ FBSD_1.0 {
amd64_set_fsbase;
amd64_set_gsbase;
brk;
exect;
sbrk;
vfork;
};

3
lib/libc/amd64/sys/Makefile.inc
View File

@ -8,8 +8,7 @@ SRCS+= \
amd64_set_fsbase.c \
amd64_set_gsbase.c
MDASM= vfork.S brk.S cerror.S exect.S getcontext.S \
sbrk.S
MDASM= vfork.S brk.S cerror.S getcontext.S sbrk.S
# Don't generate default code for these syscalls:
NOASM+= vfork.o

53
lib/libc/amd64/sys/exect.S
View File

@ -1,53 +0,0 @@
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(SYSLIBC_SCCS) && !defined(lint)
.asciz "@(#)exect.s 5.1 (Berkeley) 4/23/90"
#endif /* SYSLIBC_SCCS and not lint */
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#include "SYS.h"
#include <machine/psl.h>
ENTRY(exect)
movq $SYS_execve,%rax
pushfq
popq %r8
orq $PSL_T,%r8
pushq %r8
popfq
KERNCALL
jmp HIDENAME(cerror)
END(exect)
.section .note.GNU-stack,"",%progbits

1
lib/libc/gen/Makefile.inc
View File

@ -41,6 +41,7 @@ SRCS+= __getosreldate.c \
errlst.c \
errno.c \
exec.c \
exect.c \
fdevname.c \
feature_present.c \
fmtcheck.c \

1
lib/libc/gen/Symbol.map
View File

@ -105,6 +105,7 @@ FBSD_1.0 {
sys_errlist;
sys_nerr;
errno;
exect;
execl;
execle;
execlp;

45
lib/libc/gen/exect.c Normal file
View File

@ -0,0 +1,45 @@
/*-
* Copyright (c) 2018 Ali Mashtizadeh <ali@mashtizadeh.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/ptrace.h>
#include <errno.h>
#include <unistd.h>
int
exect(const char *path, char *const argv[], char *const envp[])
{
if (ptrace(PT_TRACE_ME, 0, 0, 0) != 0) {
if (errno != EBUSY)
return (-1);
}
return (execve(path, argv, envp));
}

1
lib/libc/i386/Symbol.map
View File

@ -31,7 +31,6 @@ FBSD_1.0 {
ntohs;
vfork;
brk;
exect;
i386_clr_watch;
i386_get_fsbase;
i386_get_gsbase;

3
lib/libc/i386/sys/Makefile.inc
View File

@ -7,8 +7,7 @@ SRCS+= i386_clr_watch.c i386_set_watch.c i386_vm86.c
SRCS+= i386_get_fsbase.c i386_get_gsbase.c i386_get_ioperm.c i386_get_ldt.c \
i386_set_fsbase.c i386_set_gsbase.c i386_set_ioperm.c i386_set_ldt.c
MDASM= Ovfork.S brk.S cerror.S exect.S getcontext.S \
sbrk.S syscall.S
MDASM= Ovfork.S brk.S cerror.S getcontext.S sbrk.S syscall.S
NOASM+= vfork.o

53
lib/libc/i386/sys/exect.S
View File

@ -1,53 +0,0 @@
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(SYSLIBC_SCCS) && !defined(lint)
.asciz "@(#)exect.s 5.1 (Berkeley) 4/23/90"
#endif /* SYSLIBC_SCCS and not lint */
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#include "SYS.h"
#include <machine/psl.h>
ENTRY(exect)
mov $SYS_execve,%eax
pushf
popl %edx
orl $ PSL_T,%edx
pushl %edx
popf
KERNCALL
jmp HIDENAME(cerror) /* exect(file, argv, env); */
END(exect)
.section .note.GNU-stack,"",%progbits

3
lib/libc/mips/sys/Makefile.inc
View File

@ -2,8 +2,7 @@
SRCS+= trivial-vdso_tc.c
MDASM= Ovfork.S brk.S cerror.S exect.S \
sbrk.S syscall.S
MDASM= Ovfork.S brk.S cerror.S sbrk.S syscall.S
# Don't generate default code for these syscalls:
NOASM+= vfork.o

51
lib/libc/mips/sys/exect.S
View File

@ -1,51 +0,0 @@
/* $NetBSD: exect.S,v 1.9 2003/08/07 16:42:17 agc Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#include "SYS.h"
#if defined(LIBC_SCCS) && !defined(lint)
ASMSTR("from: @(#)exect.s 8.1 (Berkeley) 6/4/93")
ASMSTR("$NetBSD: exect.S,v 1.9 2003/08/07 16:42:17 agc Exp $")
#endif /* LIBC_SCCS and not lint */
LEAF(exect)
PIC_PROLOGUE(exect)
li v0, SYS_execve
syscall
bne a3, zero, 1f
PIC_RETURN()
1:
PIC_TAILCALL(__cerror)
END(exect)

1
lib/libc/powerpc/Symbol.map
View File

@ -33,7 +33,6 @@ FBSD_1.0 {
ntohl;
ntohs;
brk;
exect;
sbrk;
vfork;
};

2
lib/libc/powerpc/sys/Makefile.inc
View File

@ -1,3 +1,3 @@
# $FreeBSD$
MDASM+= brk.S cerror.S exect.S sbrk.S
MDASM+= brk.S cerror.S sbrk.S

42
lib/libc/powerpc/sys/exect.S
View File

@ -1,42 +0,0 @@
/*-
* Copyright (c) 2002 Peter Grehan.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* $NetBSD: exect.S,v 1.3 1998/05/25 15:28:03 ws Exp $ */
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#include "SYS.h"
ENTRY(exect)
li %r0,SYS_execve
sc
bso 1f
blr
1:
b PIC_PLT(HIDENAME(cerror))
END(exect)
.section .note.GNU-stack,"",%progbits

1
lib/libc/powerpc64/Symbol.map
View File

@ -33,7 +33,6 @@ FBSD_1.0 {
ntohl;
ntohs;
brk;
exect;
sbrk;
vfork;
};

2
lib/libc/powerpc64/sys/Makefile.inc
View File

@ -1,3 +1,3 @@
# $FreeBSD$
MDASM+= brk.S cerror.S exect.S sbrk.S
MDASM+= brk.S cerror.S sbrk.S

50
lib/libc/powerpc64/sys/exect.S
View File

@ -1,50 +0,0 @@
/*-
* Copyright (c) 2002 Peter Grehan.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* $NetBSD: exect.S,v 1.3 1998/05/25 15:28:03 ws Exp $ */
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#include "SYS.h"
ENTRY(exect)
li %r0,SYS_execve
sc
bso 1f
blr
1:
mflr %r0
std %r0,16(%r1)
stdu %r1,-48(%r1)
bl HIDENAME(cerror)
nop
ld %r1,0(%r1)
ld %r0,16(%r1)
mtlr %r0
blr
END(exect)
.section .note.GNU-stack,"",%progbits

3
lib/libc/sparc64/Symbol.map
View File

@ -33,7 +33,6 @@ FBSD_1.0 {
ntohl;
ntohs;
brk;
exect;
sbrk;
vfork;
@ -82,8 +81,6 @@ FBSDprivate_1.0 {
__siglongjmp;
__sys_brk;
_brk;
__sys_exect;
_exect;
_end;
__sys_sbrk;
_sbrk;

2
lib/libc/sparc64/sys/Makefile.inc
View File

@ -12,4 +12,4 @@ SRCS+= __sparc_sigtramp_setup.c \
CFLAGS+= -I${LIBC_SRCTOP}/sparc64/fpu
MDASM+= brk.S cerror.S exect.S sbrk.S sigaction1.S
MDASM+= brk.S cerror.S sbrk.S sigaction1.S

51
lib/libc/sparc64/sys/exect.S
View File

@ -1,51 +0,0 @@
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Header: exect.s,v 1.1 91/07/06 13:05:57 torek Exp
*/
#if defined(LIBC_SCCS) && !defined(lint)
.asciz "@(#)exect.s 8.1 (Berkeley) 6/4/93"
#if 0
RCSID("$NetBSD: exect.S,v 1.1 1998/09/11 04:56:34 eeh Exp $")
#endif
#endif /* LIBC_SCCS and not lint */
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#include "SYS.h"
_SYSENTRY(exect)
mov SYS_execve, %g1
ta %xcc, ST_SYSCALL
ERROR()
_SYSEND(exect)