cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

selfmap.c (2282B)

      1/*
      2 * Utility function to get QEMU's own process map
      3 *
      4 * Copyright (c) 2020 Linaro Ltd
      5 *
      6 * SPDX-License-Identifier: GPL-2.0-or-later
      7 */
      8
      9#include "qemu/osdep.h"
     10#include "qemu/cutils.h"
     11#include "qemu/selfmap.h"
     12
     13GSList *read_self_maps(void)
     14{
     15    gchar *maps;
     16    GSList *map_info = NULL;
     17
     18    if (g_file_get_contents("/proc/self/maps", &maps, NULL, NULL)) {
     19        gchar **lines = g_strsplit(maps, "\n", 0);
     20        int i, entries = g_strv_length(lines);
     21
     22        for (i = 0; i < entries; i++) {
     23            gchar **fields = g_strsplit(lines[i], " ", 6);
     24            if (g_strv_length(fields) > 4) {
     25                MapInfo *e = g_new0(MapInfo, 1);
     26                int errors = 0;
     27                const char *end;
     28
     29                errors |= qemu_strtoul(fields[0], &end, 16, &e->start);
     30                errors |= qemu_strtoul(end + 1, NULL, 16, &e->end);
     31
     32                e->is_read  = fields[1][0] == 'r';
     33                e->is_write = fields[1][1] == 'w';
     34                e->is_exec  = fields[1][2] == 'x';
     35                e->is_priv  = fields[1][3] == 'p';
     36
     37                errors |= qemu_strtoul(fields[2], NULL, 16, &e->offset);
     38                e->dev = g_strdup(fields[3]);
     39                errors |= qemu_strtou64(fields[4], NULL, 10, &e->inode);
     40
     41                if (!errors) {
     42                    /*
     43                     * The last field may have leading spaces which we
     44                     * need to strip.
     45                     */
     46                    if (g_strv_length(fields) == 6) {
     47                        e->path = g_strdup(g_strchug(fields[5]));
     48                    }
     49                    map_info = g_slist_prepend(map_info, e);
     50                } else {
     51                    g_free(e->dev);
     52                    g_free(e);
     53                }
     54            }
     55
     56            g_strfreev(fields);
     57        }
     58        g_strfreev(lines);
     59        g_free(maps);
     60    }
     61
     62    /* ensure the map data is in the same order we collected it */
     63    return g_slist_reverse(map_info);
     64}
     65
     66/**
     67 * free_self_maps:
     68 * @info: a GSlist
     69 *
     70 * Free a list of MapInfo structures.
     71 */
     72static void free_info(gpointer data)
     73{
     74    MapInfo *e = (MapInfo *) data;
     75    g_free(e->dev);
     76    g_free(e->path);
     77    g_free(e);
     78}
     79
     80void free_self_maps(GSList *info)
     81{
     82    g_slist_free_full(info, &free_info);
     83}