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Disable the usage of ptrace() by all processes

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raja-grewal 2025-09-28 03:20:24 +00:00 • committed by GitHub
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13
usr/lib/sysctl.d/990-security-misc.conf#security-misc-shared
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@ -227,8 +227,8 @@ kernel.io_uring_disabled=2
##
## https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl-userspace
## Restrict usage of the ptrace() system call to only processes with CAP_SYS_PTRACE.
## Limit ptrace() as it enables programs to inspect and modify other active processes.
## Diable the usage of the ptrace() system call by all processes.
## Restrict ptrace() as it enables programs to inspect and modify other active processes.
## Prevents native code debugging which some programs use as a method to detect tampering.
## May cause breakages in 'anti-cheat' software and programs running under Proton/WINE.
##
@ -238,13 +238,10 @@ kernel.io_uring_disabled=2
## https://github.com/GrapheneOS/os-issue-tracker/issues/651#issuecomment-917599928
## https://github.com/netblue30/firejail/issues/2860
##
## KSPP=partial
## KSPP sets the stricter sysctl kernel.yama.ptrace_scope=3.
## KSPP=yes
## KSPP sets the sysctl.
##
## It is possible to harden further by disabling ptrace() for all users, see documentation.
## https://github.com/Kicksecure/security-misc/pull/242
##
kernel.yama.ptrace_scope=2
kernel.yama.ptrace_scope=3
## Maximize bits of entropy for improved effectiveness of mmap ASLR.
## The maximum number of bits depends on CPU architecture (the ones shown below are for x86).