某些应用程序在启动后不久就停止使用 LD_PRELOAD

问：

我一直在尝试LD_PRELOAD，具体来说，我想用我自己的实现替换 malloc 和 free，它打印有关在 malloc 的情况下分配的字节数和在 free 的情况下释放的地址的信息。

不幸的是，我的实验在许多程序上都没有成功，包括 Firefox、Discord、MS Teams 和 Telegram。虽然这些程序最初使用我的内存分配器版本，但它们很快就停止使用它。

最初，我尝试在终端中运行命令： LD_PRELOAD=<my_library_name.so> ./<program>

但是，我后来发现，对于上面提到的一些程序，<program>不是实际的二进制文件，而是运行二进制文件的脚本。然后，我尝试找到实际的二进制文件并运行它们，但结果仍然相同。

我的问题是，是否有一种方法可以将LD_PRELOAD传播到所有子进程，或者是否有另一种方法可以确保一致地使用我的实现。这不仅仅是关于查看 malloc 和免费使用的日志，这是我可以使用 ltrace 实现的，而是关于实验和学习一些东西。我想确切地了解是什么导致了我的问题以及如何解决它。

运行 Discord 的日志示例：

> LD_PRELOAD=./my_malloc.so /snap/discord/151/usr/share/discord/Discord

allocated: 32 bytes, at: 0x5578afe902a0
allocated: 32 bytes, at: 0x5578afe902d0
allocated: 32 bytes, at: 0x5578afe90300
allocated: 2 bytes, at: 0x5578afe90330
allocated: 5 bytes, at: 0x5578afe90350
free at: 0x5578afe90350
allocated: 120 bytes, at: 0x5578afe90370
allocated: 12 bytes, at: 0x5578afe90350
allocated: 792 bytes, at: 0x5578afe903f0
allocated: 104 bytes, at: 0x5578afe90710
allocated: 1328 bytes, at: 0x5578afe90780
allocated: 208 bytes, at: 0x5578afe90cc0
allocated: 424 bytes, at: 0x5578afe90da0
allocated: 96 bytes, at: 0x5578afe90f50
allocated: 80 bytes, at: 0x5578afe90fc0
Discord 0.0.26
Starting app.
Starting updater.
2023-04-19T21:31:47.995Z [Modules] Modules initializing
2023-04-19T21:31:47.995Z [Modules] Distribution: remote
2023-04-19T21:31:47.995Z [Modules] Host updates: enabled
2023-04-19T21:31:47.995Z [Modules] Module updates: enabled
2023-04-19T21:31:47.996Z [Modules] Module install path: /home/test_user/.config/discord/0.0.26/modules
2023-04-19T21:31:47.996Z [Modules] Module installed file path: /home/test_user/.config/discord/0.0.26/modules/installed.json
2023-04-19T21:31:47.996Z [Modules] Module download path: /home/test_user/.config/discord/0.0.26/modules/pending
2023-04-19T21:31:48.139Z [Modules] No updates to install
2023-04-19T21:31:48.139Z [Modules] Checking for host updates.
[89694:0419/233148.276510:ERROR:shared_image_factory.cc(575)] Could not find SharedImageBackingFactory with params: usage: Gles2|Raster|DisplayRead|Scanout, format: BGRA_8888, share_between_threads: 0, gmb_type: shared_memory
[89694:0419/233148.276681:ERROR:shared_image_factory.cc(575)] Could not find SharedImageBackingFactory with params: usage: Gles2|Raster|DisplayRead|Scanout, format: BGRA_8888, share_between_threads: 0, gmb_type: shared_memory
[89694:0419/233148.276749:ERROR:shared_image_factory.cc(575)] Could not find SharedImageBackingFactory with params: usage: Gles2|Raster|DisplayRead|Scanout, format: BGRA_8888, share_between_threads: 0, gmb_type: shared_memory
[89694:0419/233148.276813:ERROR:shared_image_factory.cc(575)] Could not find SharedImageBackingFactory with params: usage: Gles2|Raster|DisplayRead|Scanout, format: BGRA_8888, share_between_threads: 0, gmb_type: shared_memory

正如你在开始时看到的，有我的日志，但在“Discord 0.0.26”之后，我的带有 malloc 和 free 的库突然停止使用。