OpenBSD 5.9 無法預載入庫 ''

我為 Linux 和 OpenBSD 開發，有時我得到錯誤can't preload library- 你知道這意味著什麼嗎？

我得到的確切輸出是：

: can't preload library

當我嘗試執行腳本和/或二進製文件時。這似乎與引用有關，但我不確定。

這個問題在 Linux 上不會出現，只有 OpenBSD 才會出現。

程式碼在這裡，但我不知道它的作用：

void
_dl_dopreload(char *paths)
{
   char        *cp, *dp;
   elf_object_t    *shlib;

   dp = paths = _dl_strdup(paths);
   if (dp == NULL) {
       _dl_printf("preload: out of memory");
       _dl_exit(1);
   }

   while ((cp = _dl_strsep(&dp, ":")) != NULL) {
       shlib = _dl_load_shlib(cp, _dl_objects, OBJTYPE_LIB,
       _dl_objects->obj_flags);
       if (shlib == NULL) {
           _dl_printf("%s: can't preload library '%s'\n",
               __progname, cp);
           _dl_exit(4);
       }
       _dl_add_object(shlib);
       _dl_link_child(shlib, _dl_objects);
   }
   _dl_free(paths);
   return;
}

這是我的腳本，適用於dashLinux，我嘗試使用 OpenBSD:s Korn shell 執行它。

#!/bin/sh
echo "-- Testing our implementation of OpenShell --"
echo ""
echo "- If you have any problem in passing a test read the corresponding"
echo "- source file to understand what the test is checking"
echo ""
printf "********************* PRESS ENTER TO RUN TESTS  ... "
read _

# Key pressed, do something
printf "********************* TEST WILDCARDS \n***** Press any key to listing all files in current directory...\nYou should see filesnames *.* below "
read _
valgrind --leak-check=full -v ./shell << EOF
ls -al *.*
EOF
printf "********************* TEST ALGORITHMS ...  \n***** Press any key to run the algorithms... .\nYou should see the output from top -b -n1|head -8|tail -1 "
read _
top -b -n1|head -8|tail -1|sort -n|wc -l
valgrind --leak-check=full -v ./shell << EOF
ls|grep open
EOF

printf "********************* TEST ALGORITHMS Part II.  ... .\nYou should see the output from who|awk '{print \$4 ; print \$3}'|sort -n|wc -l. "
read _
valgrind --leak-check=full ./shell << EOF
who|awk '{print \$4 ; print \$3}'|sort -n|wc -l
EOF

printf "********************* TEST CHECKENV.  ..... .\nYou should see the output checkenv below "
read _
valgrind ./shell << EOF
checkenv
EOF
printf "********************* TEST DONE. YOU SHOULD SEE OUTPUT FROM TEST ABOVE ... "
read _

openbsd在安全性方面有一個獨特的記憶體管理概念。因此，不能預載入靜態連結庫。

程式碼如下：

       shlib = _dl_load_shlib(cp, _dl_objects, OBJTYPE_LIB,
       _dl_objects->obj_flags);
       if (shlib == NULL) {
           _dl_printf("%s: can't preload library '%s'\n",
               __progname, cp);
           _dl_exit(4);
       }

因此，shlib不應將 的值測試為NULL。

請嘗試載入動態連結庫，這應該可以。

引用自：https://unix.stackexchange.com/questions/280759