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Issue #15905: Fix theoretical buffer overflow in handling of sys.argv[0],

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prefix and exec_prefix if the operation system does not obey MAXPATHLEN.
This commit is contained in:
Christian Heimes 2013-07-22 12:53:32 +02:00
parent 37c916dd18
commit 60a6067709
3 changed files with 19 additions and 7 deletions
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7
Python/sysmodule.c
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@ -1856,10 +1856,11 @@ sys_update_path(int argc, wchar_t **argv)
if (q == NULL)
argv0 = link; /* argv0 without path */
else {
/* Must make a copy */
wcscpy(argv0copy, argv0);
/* Must make a copy, argv0copy has room for 2 * MAXPATHLEN */
wcsncpy(argv0copy, argv0, MAXPATHLEN);
q = wcsrchr(argv0copy, SEP);
wcscpy(q+1, link);
wcsncpy(q+1, link, MAXPATHLEN);
q[MAXPATHLEN + 1] = L'\0';
argv0 = argv0copy;
}
}