--- /dev/null
+/*
+ * Copyright (c) 2018 The strace developers.
+ * 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"
+
+/*
+ * Fetch indirect syscall arguments that are provided as an array.
+ * Return a pointer to a static array of kernel_ulong_t elements,
+ * or NULL in case of fetch failure.
+ */
+kernel_ulong_t *
+fetch_indirect_syscall_args(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int n_args)
+{
+ static kernel_ulong_t u_arg[MAX_ARGS];
+
+ if (current_wordsize == sizeof(*u_arg)) {
+ if (umoven(tcp, addr, sizeof(*u_arg) * n_args, u_arg))
+ return NULL;
+ } else {
+ uint32_t narrow_arg[ARRAY_SIZE(u_arg)];
+
+ if (umoven(tcp, addr, sizeof(*narrow_arg) * n_args, narrow_arg))
+ return NULL;
+ for (unsigned int i = 0; i < n_args; ++i)
+ u_arg[i] = narrow_arg[i];
+ }
+
+ return u_arg;
+}
*/
#if HAVE_ARCH_OLD_MMAP
-/**
- * Fetch old_mmap/old_mmap_pgoff arguments that are provided as a 6-element
- * array. Return pointer to a static array or NULL in case of fetch failure.
- */
-kernel_ulong_t *
-fetch_old_mmap_args(struct tcb *tcp)
-{
- static kernel_ulong_t u_arg[6];
-
- if (current_wordsize == 4) {
- unsigned int narrow_arg[6];
- if (umove(tcp, tcp->u_arg[0], &narrow_arg))
- return NULL;
- for (unsigned int i = 0; i < 6; i++)
- u_arg[i] = narrow_arg[i];
- } else {
- if (umove(tcp, tcp->u_arg[0], &u_arg))
- return NULL;
- }
-
- return u_arg;
-}
-
/* Params are pointed to by u_arg[0], offset is in bytes */
SYS_FUNC(old_mmap)
{
- kernel_ulong_t *args = fetch_old_mmap_args(tcp);
+ kernel_ulong_t *args =
+ fetch_indirect_syscall_args(tcp, tcp->u_arg[0], 6);
if (args)
print_mmap(tcp, args, args[5]);
/* Params are pointed to by u_arg[0], offset is in pages */
SYS_FUNC(old_mmap_pgoff)
{
- kernel_ulong_t *args = fetch_old_mmap_args(tcp);
+ kernel_ulong_t *args =
+ fetch_indirect_syscall_args(tcp, tcp->u_arg[0], 6);
if (args) {
unsigned long long offset;