The Tor Browser: tools/reorder/mapaddrs.cpp@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 /*

     7   A program that reverse-maps a binary stream of address references to

     8   function names.

    10  */

    12 #include <fstream>

    13 #include <unistd.h>

    14 #include <fcntl.h>

    15 #include <stdio.h>

    17 #include "elf_symbol_table.h"

    19 #define _GNU_SOURCE

    20 #include <getopt.h>

    22 static int

    23 map_addrs(int fd, elf_symbol_table &table)

    24 {

    25     // Read the binary addresses from stdin.

    26     unsigned int buf[128];

    27     ssize_t cb;

    29     while ((cb = read(fd, buf, sizeof buf)) > 0) {

    30         if (cb % sizeof buf[0])

    31             fprintf(stderr, "unaligned read\n");

    33         unsigned int *addr = buf;

    34         unsigned int *limit = buf + (cb / 4);

    36         for (; addr < limit; ++addr) {

    37             const Elf32_Sym *sym = table.lookup(*addr);

    38             if (sym)

    39                 cout << table.get_symbol_name(sym) << endl;

    40         }

    41     }

    43     return 0;

    44 }

    46 static struct option long_options[] = {

    47     { "exe", required_argument, 0, 'e' },

    48     { 0,     0,                 0, 0   }

    49 };

    51 static void

    52 usage()

    53 {

    54     cerr << "usage: mapaddrs --exe=exe file ..." << endl;

    55 }

    57 int

    58 main(int argc, char *argv[])

    59 {

    60     elf_symbol_table table;

    62     while (1) {

    63         int option_index = 0;

    64         int c = getopt_long(argc, argv, "e:", long_options, &option_index);

    66         if (c < 0)

    67             break;

    69         switch (c) {

    70         case 'e':

    71             table.init(optarg);

    72             break;

    74         default:

    75             usage();

    76             return 1;

    77         }

    78     }

    80     if (optind >= argc) {

    81         map_addrs(STDIN_FILENO, table);

    82     }

    83     else {

    84         do {

    85             int fd = open(argv[optind], O_RDONLY);

    86             if (fd < 0) {

    87                 perror(argv[optind]);

    88                 return 1;

    89             }

    91             map_addrs(fd, table);

    92             close(fd);

    93         } while (++optind < argc);

    94     }

    96     return 0;

    97 }

The Tor Browser / file revision

tools/reorder/mapaddrs.cpp@97036ab72558

tools/reorder/mapaddrs.cpp