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309 lines
8.3 KiB
309 lines
8.3 KiB
4 months ago
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/*
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* Check decoding of process_vm_readv/process_vm_writev syscall.
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*
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* Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
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* Copyright (c) 2016-2018 The strace developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <inttypes.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/uio.h>
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#if OP_WR
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# define in_iovec rmt_iovec
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# define out_iovec lcl_iovec
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# define in_iov rmt_iov
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# define out_iov lcl_iov
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#else
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# define in_iovec lcl_iovec
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# define out_iovec rmt_iovec
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# define in_iov lcl_iov
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# define out_iov rmt_iov
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#endif
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typedef void (*iov_print_fn)(const struct iovec *, const void *, long);
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enum { MAX_SEGM_COUNT = 2, MAX_STR_LEN = 5 };
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struct print_iov_arg {
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uint32_t count;
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uint32_t valid :1,
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string :1,
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addr_term:1,
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check_rc :1;
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uint32_t str_segms;
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uint8_t str_base[MAX_SEGM_COUNT];
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uint8_t str_size[MAX_SEGM_COUNT];
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};
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static void
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print_iov(const struct iovec *iov, const void *arg_ptr, long rc)
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{
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const struct print_iov_arg *arg = arg_ptr;
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uint32_t i;
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uint32_t num_segm = 0;
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uint64_t segm_offs = 0;
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if (!arg || !arg->valid) {
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if (iov)
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printf("%p", iov);
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else
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printf("NULL");
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return;
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}
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printf("[");
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for (i = 0; i < arg->count; i++) {
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if (i)
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printf(", ");
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if (i >= MAX_STR_LEN) {
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printf("...");
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break;
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}
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printf("{iov_base=");
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if (arg->string && (!arg->check_rc || (rc != -1))) {
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uint64_t str_left = iov[i].iov_len;
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uint64_t pr_count = 0;
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printf("\"");
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while (str_left--) {
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static const char oct_str[] = "01234567";
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uint8_t c = arg->str_base[num_segm] + segm_offs;
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if ((num_segm >= arg->str_segms) ||
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(num_segm >= MAX_SEGM_COUNT))
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error_msg_and_fail("print_iov: segment "
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"count overrun");
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if (pr_count++ < MAX_STR_LEN)
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printf("\\%.1s%.1s%d",
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(c >> 6) ?
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oct_str + (c >> 6) : "",
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(c >> 3) ?
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oct_str + ((c >> 3) & 7) : "",
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c & 7);
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segm_offs++;
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if (segm_offs >= arg->str_size[num_segm]) {
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num_segm++;
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segm_offs = 0;
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}
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}
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printf("\"");
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if (pr_count > MAX_STR_LEN)
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printf("...");
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} else {
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if (iov[i].iov_base)
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printf("%p", iov[i].iov_base);
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else
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printf("NULL");
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}
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printf(", iov_len=%zu}", iov[i].iov_len);
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}
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if (arg->addr_term)
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printf(", ... /* %p */", iov + arg->count);
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printf("]");
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}
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static void
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do_call(kernel_ulong_t pid,
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kernel_ulong_t local_iov, const char *local_arg,
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kernel_ulong_t liovcnt,
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kernel_ulong_t remote_iov, const char *remote_arg,
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kernel_ulong_t riovcnt,
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kernel_ulong_t flags, iov_print_fn pr_iov)
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{
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long rc;
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const char *errstr;
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rc = syscall(OP_NR, pid, local_iov, liovcnt, remote_iov, riovcnt,
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flags);
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errstr = sprintrc(rc);
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printf("%s(%d, ", OP_STR, (int) pid);
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if (pr_iov)
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pr_iov((const struct iovec *) (uintptr_t) local_iov, local_arg,
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rc);
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else
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printf("%s", local_arg);
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printf(", %lu, ", (unsigned long) liovcnt);
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if (pr_iov)
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pr_iov((const struct iovec *) (uintptr_t) remote_iov,
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remote_arg, rc);
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else
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printf("%s", remote_arg);
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printf(", %lu, %lu) = %s\n", (unsigned long) riovcnt,
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(unsigned long) flags, errstr);
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}
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kernel_ulong_t
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ptr_cast(void *ptr)
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{
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return (kernel_ulong_t) (uintptr_t) ptr;
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}
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int
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main(void)
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{
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enum {
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SIZE_11 = 2,
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SIZE_12 = 3,
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SIZE_13 = 4,
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SIZE_1 = SIZE_11 + SIZE_12 + SIZE_13,
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SIZE_21 = 5,
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SIZE_22 = 6,
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SIZE_23 = 7,
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SIZE_2 = SIZE_21 + SIZE_22 + SIZE_23,
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};
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enum {
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SEGM1_BASE = 0x80,
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SEGM2_BASE = 0xA0,
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};
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static const kernel_ulong_t bogus_pid =
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(kernel_ulong_t) 0xbadfaceddeadca57ULL;
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static const kernel_ulong_t bogus_iovcnt1 =
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(kernel_ulong_t) 0xdec0ded1defaced2ULL;
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static const kernel_ulong_t bogus_iovcnt2 =
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(kernel_ulong_t) 0xdec0ded3defaced4ULL;
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static const kernel_ulong_t bogus_flags =
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(kernel_ulong_t) 0xdeadc0deda7adeadULL;
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pid_t my_pid = getpid();
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char *data1_out = tail_alloc(SIZE_1);
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char *data2_out = tail_alloc(SIZE_2);
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char *data1_in = tail_alloc(SIZE_2);
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char *data2_in = tail_alloc(SIZE_1);
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struct iovec bogus_iovec[] = {
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{ data1_out + SIZE_1, (size_t) 0xdeadfaceca57beefULL },
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{ data1_in + SIZE_2, (size_t) 0xbadc0dedda7adeadULL },
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{ data2_out + SIZE_2, (size_t) 0xf157facedec0ded1ULL },
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{ data2_in + SIZE_1, (size_t) 0xdefaced2bea7be57ULL },
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};
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struct iovec out_iovec[] = {
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{ data1_out, SIZE_11 },
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{ data1_out + SIZE_11, SIZE_12 },
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{ data1_out + SIZE_11 + SIZE_12, SIZE_13 },
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{ data2_out, SIZE_21 },
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{ data2_out + SIZE_21, SIZE_22 },
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{ data2_out + SIZE_21 + SIZE_22, SIZE_23 },
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};
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struct iovec in_iovec[] = {
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{ data1_in, SIZE_23 },
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{ data1_in + SIZE_23, SIZE_22 },
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{ data1_in + SIZE_23 + SIZE_22, SIZE_21 },
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{ data2_in, SIZE_13 },
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{ data2_in + SIZE_13, SIZE_12 },
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{ data2_in + SIZE_13 + SIZE_12, SIZE_11 },
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};
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struct iovec *bogus_iov = tail_memdup(bogus_iovec, sizeof(bogus_iovec));
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struct iovec *lcl_iov = tail_memdup(lcl_iovec, sizeof(lcl_iovec));
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struct iovec *rmt_iov = tail_memdup(rmt_iovec, sizeof(rmt_iovec));
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struct print_iov_arg bogus_arg = { ARRAY_SIZE(bogus_iovec), 1 };
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struct print_iov_arg lcl_arg = { ARRAY_SIZE(lcl_iovec), 1, 1, 0, 0,
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2, {SEGM1_BASE, SEGM2_BASE}, {SIZE_1, SIZE_2} };
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struct print_iov_arg rmt_arg = { ARRAY_SIZE(rmt_iovec), 1 };
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struct print_iov_arg bogus_arg_cut = {
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ARRAY_SIZE(bogus_iovec) - 2, 1, 0, 1
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};
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struct print_iov_arg lcl_arg_cut = {
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ARRAY_SIZE(lcl_iovec) - 2, 1, 1, 1, 0, 2,
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{ SEGM1_BASE + SIZE_11 + SIZE_12, SEGM2_BASE },
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{SIZE_13, SIZE_2}
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};
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struct print_iov_arg rmt_arg_cut = { ARRAY_SIZE(rmt_iovec) - 2, 1 };
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fill_memory_ex(data1_out, SIZE_1, SEGM1_BASE, SIZE_1);
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fill_memory_ex(data2_out, SIZE_2, SEGM2_BASE, SIZE_2);
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do_call(bogus_pid, (kernel_ulong_t) (uintptr_t) ARG_STR(NULL),
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bogus_iovcnt1, (kernel_ulong_t) (uintptr_t) ARG_STR(NULL),
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bogus_iovcnt2, bogus_flags, NULL);
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do_call(my_pid, ptr_cast(bogus_iov + ARRAY_SIZE(bogus_iovec)),
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"[]", 0, ptr_cast(in_iov + ARRAY_SIZE(in_iovec)), "[]",
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0, 0, NULL);
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do_call(my_pid, ptr_cast(bogus_iov + ARRAY_SIZE(bogus_iovec)), NULL,
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bogus_iovcnt1, ptr_cast(in_iov + ARRAY_SIZE(in_iovec)), NULL,
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bogus_iovcnt2, 0, print_iov);
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do_call(my_pid, ptr_cast(bogus_iov), (char *) &bogus_arg,
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ARRAY_SIZE(bogus_iovec), ptr_cast(rmt_iov + 2),
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(char *) &rmt_arg_cut, ARRAY_SIZE(rmt_iovec) - 2, 0, print_iov);
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#if !OP_WR
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lcl_arg.check_rc = 1;
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lcl_arg_cut.check_rc = 1;
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#endif
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do_call(my_pid, ptr_cast(lcl_iov + 2), (char *) &lcl_arg_cut,
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ARRAY_SIZE(lcl_iovec) - 1, ptr_cast(bogus_iov + 2),
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(char *) &bogus_arg_cut, ARRAY_SIZE(bogus_iovec) - 1, 0,
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print_iov);
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lcl_arg_cut.addr_term = 0;
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rmt_arg_cut.addr_term = 1;
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rmt_arg_cut.count = 5;
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do_call(my_pid, ptr_cast(lcl_iov + 2), (char *) &lcl_arg_cut,
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ARRAY_SIZE(lcl_iovec) - 2, ptr_cast(rmt_iov + 1),
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(char *) &rmt_arg_cut, ARRAY_SIZE(rmt_iovec), 0, print_iov);
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/* Correct call */
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do_call(my_pid, ptr_cast(lcl_iov), (char *) &lcl_arg,
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ARRAY_SIZE(lcl_iovec), ptr_cast(rmt_iov), (char *) &rmt_arg,
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ARRAY_SIZE(rmt_iovec), 0, print_iov);
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puts("+++ exited with 0 +++");
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return 0;
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}
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