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Introduce upoke function

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This will be needed to implement fault injection on those architectures
that lack PTRACE_SETREGSET/PTRACE_SETREGS support.

* defs.h (upoke): New prototype.
* upoke.c: New file.
* Makefile.am (libstrace_a_SOURCES): Add it.
This commit is contained in:
Дмитрий Левин 2016-11-11 17:10:33 +00:00
parent d3fc04ebdf
commit b5b750b289
3 changed files with 42 additions and 0 deletions
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1
Makefile.am
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@ -73,6 +73,7 @@ libstrace_a_SOURCES = \
sync_file_range.c \
sync_file_range2.c \
upeek.c \
upoke.c \
# end of libstrace_a_SOURCES
strace_SOURCES = \

1
defs.h
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@ -483,6 +483,7 @@ umoven_or_printaddr_ignore_syserror(struct tcb *tcp, const long addr,
const unsigned int len, void *our_addr);
extern int umovestr(struct tcb *, long, unsigned int, char *);
extern int upeek(int pid, long, long *);
extern int upoke(int pid, long, long);
extern bool
print_array(struct tcb *tcp,

40
upoke.c Normal file
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@ -0,0 +1,40 @@
/*
* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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 "defs.h"
#include "ptrace.h"
int
upoke(int pid, long off, long val)
{
if (ptrace(PTRACE_POKEUSER, (pid_t) pid, (void *) off, (void *) val)) {
if (errno != ESRCH)
perror_msg("upoke: PTRACE_POKEUSER pid:%d @%#lx)", pid, off);
return -1;
}
return 0;
}