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https://www.ibm.com/support/knowledgecenter/en/linuxonibm/com.ibm.linux.z.lhdd/lhdd_r_vdsoparm.html
The glibc detects the presence of the vdso and uses the functions that are provided in the library. Because the vdso library is mapped to all user-space processes, this change is visible in user space. In the unlikely event that a user-space program does not work with the vdso support, you can disable the support.
https://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration/re31.html
Linux Kernel Configuration Guide. Description. Disable (0) or enable (1) the VDSO (Virtual Dynamic Shared Object) mapping option.
https://stackoverflow.com/questions/39114292/disable-linux-vsyscall-vdso-vvar
Dec 15, 2016 · Disable Linux vsyscall vdso vvar. ... If you disable gettimeofday(), the confined program will not be able to call that syscall through emulated vsyscall, vDSO, or regular syscall. If you confine them this way with seccomp, you shouldn't have to worry about the attack surface they create.
https://github.com/ValveSoftware/steamos_kernel/pull/9/commits/e97d991740cd365bb80b906f738ef57ac16bd1f1
Nov 20, 2014 · x86, vdso: Remove compat vdso support The compat vDSO is a complicated hack that's needed to maintain compatibility with a small range of glibc versions. This removes it and replaces it with a much simpler hack: a config option to disable the 32-bit vDSO by default.
https://unix.stackexchange.com/questions/9885/where-is-config-compat-vdso-in-make-menuconfig
But I'm stumped when I reached the option CONFIG_COMPAT_VDSO. Where is it exactly in make menuconfig? The site indicated that the options is in the Processor type …
https://opensource.com/article/17/6/timekeeping-linux-vms
An introduction to timekeeping in Linux VMs. ... Call clock_gettime() from vDSO ... We don't know for sure, but the guess is that in this case the hypervisor will try synchronizing TSCs or disable the TSC page mechanism altogether. The protocol for the TSC page is: struct ms_hyperv_tsc_page
https://github.com/gperftools/gperftools/issues/307
I'll ask our local vdso expert to take a look and see if he can figure out what's going on here. In the meantime, you can disable the vdso stuff by changing the line #if defined(__ELF__) && defined(__GLIBC__) to #if 0 in src/base/vdso_support.h Hopefully …
http://lkml.iu.edu/hypermail/linux/kernel/0703.0/1730.html
Re: [patch] paravirt: VDSO page is essential From ... especially if that technology can be built with the ability to warn them that they probably need to boot with vdso=disabled? ... take #GPs and kill the init proc, because for us, this is not an expected support scenario. We would much rather support the VDSO by default in paravirt kernels ...
https://blog.packagecloud.io/eng/2017/03/08/system-calls-are-much-slower-on-ec2/
Mar 08, 2017 · TL;DR. This blog post dives into an interesting finding: two frequently used system calls (gettimeofday, clock_gettime) are much slower on AWS EC2.Linux provides a mechanism for speeding up those two frequently used system calls by implementing the system call code in userland and avoiding the switch to the kernel entirely.
https://news.ycombinator.com/item?id=16922495
> (I maintain the Linux vDSO, and the HPET has so many problems that I disabled vDSO HPET support entirely a while back.) For those who don't know: the vDSO is a "dynamic library" provided by the Linux kernel to every process.
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