Dmitry V. Levin
fc346f1d91
This is the first step in the direction of revisiting current practice of indiscriminate use of signed types for syscall arguments and memory addresses. * kernel_types.h (kernel_ureg_t): New type, typedef to unsigned long. * defs.h (struct tcb): Change type of u_arg from long to kernel_ureg_t. [HAVE_STRUCT_TCB_EXT_ARG]: Change type of ext_arg from long long to unsigned long long. * desc.c (decode_select): Change type of syscall arguments from long to kernel_ureg_t. (SYS_FUNC(oldselect)): Change type of select_args from long to kernel_ureg_t. * io.c (print_lld_from_low_high_val): Remove no longer needed cast of syscall arguments to unsigned long. * lseek.c (SYS_FUNC(lseek)): Cast syscall argument from unsigned long to long. * mem.c (print_mmap): Change type of syscall arguments from long to kernel_ureg_t. (SYS_FUNC(old_mmap), SYS_FUNC(old_mmap_pgoff)): Change type of u_arg from long to kernel_ureg_t. (SYS_FUNC(mmap), SYS_FUNC(mmap_pgoff), SYS_FUNC(mmap_pgoff)): Remove no longer needed cast of syscall arguments to unsigned long. * pathtrace.c (pathtrace_match): Change type of args and select_args from long to kernel_ureg_t. * util.c (getarg_ull): Remove no longer needed casts of syscall arguments to unsigned types.
122 lines
4.2 KiB
C
122 lines
4.2 KiB
C
/*
|
|
* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
|
|
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
|
|
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
|
|
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
|
|
* Copyright (c) 2002-2005 Roland McGrath <roland@redhat.com>
|
|
* Copyright (c) 2009 Andreas Schwab <schwab@redhat.com>
|
|
* Copyright (c) 2012 H.J. Lu <hongjiu.lu@intel.com>
|
|
* Copyright (c) 2013 Denys Vlasenko <vda.linux@googlemail.com>
|
|
* Copyright (c) 2014-2016 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 "xlat/whence_codes.h"
|
|
|
|
/* Linux kernel has exactly one version of lseek:
|
|
* fs/read_write.c::SYSCALL_DEFINE3(lseek, unsigned, fd, off_t, offset, unsigned, origin)
|
|
* In kernel, off_t is always the same as (kernel's) long
|
|
* (see include/uapi/asm-generic/posix_types.h),
|
|
* which means that on x32 we need to use tcp->ext_arg[N] to get offset argument.
|
|
* Use test/x32_lseek.c to test lseek decoding.
|
|
*/
|
|
#if HAVE_STRUCT_TCB_EXT_ARG
|
|
SYS_FUNC(lseek)
|
|
{
|
|
printfd(tcp, tcp->u_arg[0]);
|
|
|
|
long long offset;
|
|
# if SUPPORTED_PERSONALITIES > 1
|
|
/* tcp->ext_arg is not initialized for compat personality */
|
|
if (current_personality == 1) {
|
|
offset = (long) tcp->u_arg[1];
|
|
} else
|
|
# endif
|
|
{
|
|
offset = tcp->ext_arg[1];
|
|
}
|
|
int whence = tcp->u_arg[2];
|
|
|
|
tprintf(", %lld, ", offset);
|
|
printxval(whence_codes, whence, "SEEK_???");
|
|
|
|
return RVAL_DECODED | RVAL_LUDECIMAL;
|
|
}
|
|
#else
|
|
SYS_FUNC(lseek)
|
|
{
|
|
printfd(tcp, tcp->u_arg[0]);
|
|
|
|
long offset =
|
|
# if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
|
|
# ifdef X86_64
|
|
current_personality == 1 ?
|
|
(long) (int) tcp->u_arg[1] : (long) tcp->u_arg[1];
|
|
# else
|
|
current_wordsize == 4 ?
|
|
(long) (int) tcp->u_arg[1] : (long) tcp->u_arg[1];
|
|
# endif
|
|
# else
|
|
tcp->u_arg[1];
|
|
# endif
|
|
int whence = tcp->u_arg[2];
|
|
|
|
tprintf(", %ld, ", offset);
|
|
printxval(whence_codes, whence, "SEEK_???");
|
|
|
|
return RVAL_DECODED | RVAL_UDECIMAL;
|
|
}
|
|
#endif
|
|
|
|
/* llseek syscall takes explicitly two ulong arguments hi, lo,
|
|
* rather than one 64-bit argument for which LONG_LONG works
|
|
* appropriate for the native byte order.
|
|
*
|
|
* See kernel's fs/read_write.c::SYSCALL_DEFINE5(llseek, ...)
|
|
*
|
|
* hi,lo are "unsigned longs" and combined exactly this way in kernel:
|
|
* ((loff_t) hi << 32) | lo
|
|
* Note that for architectures with kernel's long wider than userspace long
|
|
* (such as x32), combining code will use *kernel's*, i.e. *wide* longs
|
|
* for hi and lo. We would need to use tcp->ext_arg[N] on x32...
|
|
* ...however, x32 (and x86_64) does not _have_ llseek syscall as such.
|
|
*/
|
|
SYS_FUNC(llseek)
|
|
{
|
|
if (entering(tcp)) {
|
|
printfd(tcp, tcp->u_arg[0]);
|
|
tprintf(", %lld, ",
|
|
(zero_extend_signed_to_ull(tcp->u_arg[1]) << 32)
|
|
| zero_extend_signed_to_ull(tcp->u_arg[2]));
|
|
} else {
|
|
printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
|
|
tprints(", ");
|
|
printxval(whence_codes, tcp->u_arg[4], "SEEK_???");
|
|
}
|
|
return 0;
|
|
}
|