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https://github.com/xen-project/xen.git
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Don Slutz
822b956ef7
mmap() returns MAP_FAILED not NULL. Signed-off-by: Don Slutz <dslutz@verizon.com> Acked-by: Ian Campbell <ian.campbell@citrix.com>
128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/*
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*
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* Authors: Michael LeMay, <mdlemay@epoch.ncsc.mil>
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* George Coker, <gscoker@alpha.ncsc.mil>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2,
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* as published by the Free Software Foundation.
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include <stdio.h>
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#include <xenctrl.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <unistd.h>
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#define USE_MMAP
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static void usage (int argCnt, const char *args[])
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{
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fprintf(stderr, "Usage: %s <policy.file>\n", args[0]);
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exit(1);
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}
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int main (int argCnt, const char *args[])
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{
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const char *polFName;
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int polFd = 0;
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void *polMem = NULL;
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void *polMemCp = NULL;
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struct stat info;
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int ret;
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xc_interface *xch = 0;
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if (argCnt != 2)
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usage(argCnt, args);
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polFName = args[1];
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polFd = open(polFName, O_RDONLY);
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if ( polFd < 0 )
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{
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fprintf(stderr, "Error occurred opening policy file '%s': %s\n",
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polFName, strerror(errno));
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ret = -1;
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goto cleanup;
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}
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ret = stat(polFName, &info);
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if ( ret < 0 )
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{
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fprintf(stderr, "Error occurred retrieving information about"
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"policy file '%s': %s\n", polFName, strerror(errno));
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goto cleanup;
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}
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polMemCp = malloc(info.st_size);
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#ifdef USE_MMAP
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polMem = mmap(NULL, info.st_size, PROT_READ, MAP_SHARED, polFd, 0);
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if ( polMem == MAP_FAILED )
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{
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fprintf(stderr, "Error occurred mapping policy file in memory: %s\n",
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strerror(errno));
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ret = -1;
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goto cleanup;
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}
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xch = xc_interface_open(0,0,0);
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if ( !xch )
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{
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fprintf(stderr, "Unable to create interface to xenctrl: %s\n",
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strerror(errno));
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ret = -1;
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goto cleanup;
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}
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memcpy(polMemCp, polMem, info.st_size);
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#else
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ret = read(polFd, polMemCp, info.st_size);
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if ( ret < 0 )
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{
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fprintf(stderr, "Unable to read new Flask policy file: %s\n",
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strerror(errno));
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goto cleanup;
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}
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else
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{
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printf("Read %d bytes from policy file '%s'.\n", ret, polFName);
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}
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#endif
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ret = xc_flask_load(xch, polMemCp, info.st_size);
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if ( ret < 0 )
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{
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errno = -ret;
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fprintf(stderr, "Unable to load new Flask policy: %s\n",
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strerror(errno));
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ret = -1;
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goto cleanup;
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}
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else
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{
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printf("Successfully loaded policy.\n");
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}
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done:
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free(polMemCp);
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if ( polMem )
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{
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ret = munmap(polMem, info.st_size);
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if ( ret < 0 )
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fprintf(stderr, "Unable to unmap policy memory: %s\n", strerror(errno));
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}
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if ( polFd )
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close(polFd);
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if ( xch )
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xc_interface_close(xch);
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return ret;
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cleanup:
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goto done;
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}
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