2018-05-12 10:20:25 +07:00
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# 1.5.11 jemalloc
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2018-05-24 15:33:36 +07:00
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- [jemalloc](#jemalloc)
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2018-05-24 20:24:18 +07:00
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- [编译安装](#编译安装)
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2018-05-24 15:33:36 +07:00
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- [CTF 实例](#ctf-实例)
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- [参考资料](#参考资料)
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## jemalloc
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jemalloc 是 Facebook 推出的一种通用 malloc 实现，在 FreeBSD、firefox 中被广泛使用。比起 ptmalloc2 具有更高的性能。
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2018-05-24 20:24:18 +07:00
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## 编译安装
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2018-05-24 15:33:36 +07:00
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我们来编译一个带调试信息的 jemalloc（注：4.x和5.x之间似乎差别比较大）：
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```
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$ wget https://github.com/jemalloc/jemalloc/releases/download/5.0.1/jemalloc-5.0.1.tar.bz2
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$ tar -xjvf jemalloc-5.0.1.tar.bz2
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$ cd jemalloc-5.0.1
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$ ./configure --prefix=/usr/local/jemalloc --enable-debug
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$ make -j4 && sudo make install
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```
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接下来修改链接信息：
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```
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# echo /usr/local/jemalloc/ >> /etc/ld.so.conf.d/jemalloc.conf
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# ldconfig
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```
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当我们想要在编译程序时指定 jemalloc 时可以像下面这样：
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```
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$ gcc test.c -L/usr/local/jemalloc/lib -Wl,--rpath=/usr/local/jemalloc/lib -ljemalloc
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$ ldd a.out
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linux-vdso.so.1 (0x00007fff69b62000)
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libjemalloc.so.2 => /usr/local/jemalloc/lib/libjemalloc.so.2 (0x00007f744483b000)
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libc.so.6 => /usr/lib/libc.so.6 (0x00007f744447f000)
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libm.so.6 => /usr/lib/libm.so.6 (0x00007f74440ea000)
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libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f7443d61000)
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libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f7443b43000)
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libdl.so.2 => /usr/lib/libdl.so.2 (0x00007f744393f000)
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libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f7443727000)
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/lib64/ld-linux-x86-64.so.2 => /usr/lib64/ld-linux-x86-64.so.2 (0x00007f7444f02000)
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```
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可以看到 `libjemalloc.so.2` 已经被链接到程序里了。
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## CTF 实例
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查看章节 6.1.29。
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## 参考资料
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- http://jemalloc.net/
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