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eaaae185b7
When get_shared_library_path() would got zero length buffer, it could have underflow in size calc later. So just put extra small check for this case.
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/*
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* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "lib.h"
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#include "config.h"
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#include "sharedlib.h"
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#include "toolcontext.h"
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#include <limits.h>
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#include <sys/stat.h>
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#include <dlfcn.h>
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void get_shared_library_path(struct cmd_context *cmd, const char *libname,
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char *path, size_t path_len)
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{
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struct stat info;
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if (!path_len)
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return;
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/* If libname doesn't begin with '/' then use lib_dir/libname,
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* if present */
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if (libname[0] == '/' ||
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(!cmd->lib_dir &&
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!(cmd->lib_dir = find_config_tree_str(cmd, global_library_dir_CFG, NULL))) ||
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(dm_snprintf(path, path_len, "%s/%s", cmd->lib_dir,
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libname) == -1) || stat(path, &info) == -1) {
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strncpy(path, libname, path_len - 1);
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path[path_len - 1] = '\0';
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}
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}
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void *load_shared_library(struct cmd_context *cmd, const char *libname,
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const char *desc, int silent)
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{
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char path[PATH_MAX];
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void *library;
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if (is_static()) {
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log_error("Not loading shared %s library %s in static mode.",
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desc, libname);
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return NULL;
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}
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get_shared_library_path(cmd, libname, path, sizeof(path));
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log_very_verbose("Opening shared %s library %s", desc, path);
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if (!(library = dlopen(path, RTLD_LAZY | RTLD_GLOBAL))) {
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if (silent && ignorelockingfailure())
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log_verbose("Unable to open external %s library %s: %s",
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desc, path, dlerror());
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else
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log_error("Unable to open external %s library %s: %s",
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desc, path, dlerror());
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}
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return library;
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}
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