ldd在x86 Linux上显示了不同的地址 [英] ldd shows varied addresses on x86 Linux

问题描述

我正在使用ldd在Fedora/x86上显示动态库，并且每次使用它都会显示不同的结果.

I am using ldd to show the dynamic library on Fedora/x86, and it shows different results each time it is used.

这是预期的吗?还是有解释?

Is that expected? Or is there an explanation?

我记得它在PPC/Linux上显示了固定的结果.

I remember it shows a fixed result on PPC/Linux.

`ldd /bin/ls
 linux-gate.so.1 =>  (0x00e5b000)
 librt.so.1 => /lib/librt.so.1 (0x00c0c000)
 libselinux.so.1 => /lib/libselinux.so.1 (0x0095d000)
 libcap.so.2 => /lib/libcap.so.2 (0x00110000)
 libacl.so.1 => /lib/libacl.so.1 (0x00331000)
 libc.so.6 => /lib/libc.so.6 (0x00115000)
 libpthread.so.0 => /lib/libpthread.so.0 (0x00bc9000)
 /lib/ld-linux.so.2 (0x009d2000)
 libdl.so.2 => /lib/libdl.so.2 (0x00680000)
 libattr.so.1 => /lib/libattr.so.1 (0x00447000)
ldd /bin/ls
 linux-gate.so.1 =>  (0x00f76000)
 librt.so.1 => /lib/librt.so.1 (0x00494000)
 libselinux.so.1 => /lib/libselinux.so.1 (0x0095d000)
 libcap.so.2 => /lib/libcap.so.2 (0x009e9000)
 libacl.so.1 => /lib/libacl.so.1 (0x00365000)
 libc.so.6 => /lib/libc.so.6 (0x00732000)
 libpthread.so.0 => /lib/libpthread.so.0 (0x00b61000)
 /lib/ld-linux.so.2 (0x002a7000)
 libdl.so.2 => /lib/libdl.so.2 (0x002f0000)
 libattr.so.1 => /lib/libattr.so.1 (0x00447000)`

推荐答案

Fedora使用地址空间随机化作为其各种安全措施的一部分. ldd通过实际加载共享对象并显示它们的最终位置来工作.将两者放在一起便得出给定的观察结果.

Fedora uses address space randomization as part of its various security measures. ldd works by actually loading the shared objects and showing where they end up. Putting the two together results in the given observations.

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